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PowerRequirements:

PowerConsumption:Track System:

Reel Size:Tape Speed:

'.~Cording Time:th 1,800 ft. tape)

FrequencyResponse:

Signal-to-NoiseRatio:

USA

SPECIFICATIONS

AC 120 V. 60 Hz 90 WRecording Bias

Frequency: Approx. 160 kHzInputs: Two MIC Inputs

Impedance:Maximum sensitivity:Two AUX InputsImpedance:Maximum sensitivity:REC/PB connectorImpedance:Input level:

90W4-track stereophonic and monophonic7" (18 ern) maximum7 1/2 ips, 3 3/4 ips, 1 7/8 ips(19 cm/s, 9.5 cm/s, 4.8 crn/s) Outputs: Two LINE Outputs

Load impedance:Output Iave I:HEADPHONE OutputLoad impedance:Output level:

Tape speed7)12 ips (19 crn/s)3 % ips (9.5 cm/s)

4-track stereo 4-track mono1.5 hrs 3 hrs3 hrs 6 hrs

(with SONY SLH tape)20",30,000 Hz at 7 1/2 ips (19 cm/s]20~ 20,000 Hz at 3 3/4 ips (9.5 cm/s)(with standard tape)20,,-,25,000 Hz at 7 1/2 ips (19 cm/s]30~17,OOOHzat3 3/4ips(9.5cm/s)30- 9,000 Hz at 1 7/8 ips (4.8 crn/sl

OverallDistortio n: 1.2 %

Mode

Set using I

low impedance0.2 mV (-72 dB)100 kSl0.06 V (-22 dB)10 kSl17.4 mV (-33 dB)

100 kSl0.775 V (0 dB)8Sl12.5 mV (-36 dB)level switch set to31 mV (-28 dB) wlevel switch set to

Dimensions:45 transistors, 1 integrated circuit, 27 diod17 9/16"(W) x 8 7/8" (H) x 18 1/8" (D)(446 x 225 x 460 mm)

Semiconductors:

56 dB (with SLH tape)53 dB (with standard tape) Weight: 43 lb (19.5 kg)

Flutter and Wow: 0.06 % at 7 1/ 2 ips (19 cm/s)0.10%at33/4ips(9.5cm/s)0.20 % at 1 718 ips (4.8 crn/s)

S E R V I C E M A N U A

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r "

TABLE OF CONTENTSSection Title Section Title

Specifications. 4-2-1. Record Amp. Circuit Board4-2-2. Record Equalizer Circuit Board

1. GENERAL DESCRIPTION 4-2-3. Playback Amp. Circuit Board1-1. Block Diagram. 3 4-2-4. Bias OSC Circuit Board1-2. Major Parts Locations. 4~5 4-2-5. Servo Control Circuit Board.1-3. Switch Location. 6 4-2-6. Relay Circuit Board .4-2-7. Power Supply Circuit Board.

2. DISASSEMBL Y 4-2-8. ESP Circuit Board .4-2-9. Reverse Switch Circuit Board2-1. Cabinet Removal 7 4-3. Level Diagram .2-2. Head Deck Removal. 82-3. Record Equalizer Circuit Board 5. ELECTRICAL PARTS LIST

Removal 82-4. Reverse Switch Circuit Board 6. EXPLODED VIEWS

Removal 8 6-1. Packing3. ADJUSTMENT PROCEDURES 6-2. Cabinet ~ top view ~6-3. Head Deck ~ top view ~

3-1. Mechanical Adjustments. 9~ 18 6-4. Amplifier Chassis ~ top view ~3-2. Electrical Adjustments 19~32 6-5. Chassis ~ top view ~ (1)

6-6. Chassis ~ top view ~ (2)4. DIAGRAMS 6-7. Chassis ~ to p view ~ (3)

4-1. Schematic Diagram 6-8. Chassis ~ bottom view ~4-1-1. Audio Amp. and Bias OSC

Circuit . 33~ 34 7. HARDWARES4-1-2. System Control Circuit . 35~ 36 Hard ware Nomenclature

4-2. Mounting Diagram

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SECTION 1GENERAL DESCRIPTION

1-1. BLOCK DIAGRAM

io~

~~~~Cl :;,~ i l ' ~ i l ''----v----

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1-2. MAJOR PARTS LOCATIONSCabinet - Top View-

X3497026reel table ass'y

K3497042cabinet ess'v .X3497047cover ess'v , head ..X3497046knob ess'v ,TAPE SPEED

1514867switch, lever (S108)TAPE SELECT

1514768switch, lever (S109)HEADPHONE LEVEL ..1507282jack, bineurel;HEADPHONE t.n

{L(Jl02)1507281jack, MIC R(J202) ...c

X3497050knob ass 'V, volume ~control,' A UX (L)K3497050knob sss'v , volume ;control,' MIC (L)

152408211meter, VU (L)

Cabinet - Side Views -

3497237terminal. ground

1507142jack, phono:AUX IN(JI01,201)

1507142jack, phono;LINE OUT(Jl03,203)

X3497026reel table ass'V

K34970811

L } K34970.45R button ass'v, REC3497195button, REW

1514866 switch, lever: power (S603.c. knob ass'v, volume

control; MIC (R)......................524082,11meter, VU (R)

R(SI06)} 1.514.836L(SI05) switch, lever: MONITOR

1509341socket, AC OUTL1534538cord, power

{

1532100fuse (2A), F1533048holder, fuse

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1-514-633r- -----------_ switch, lever/ AUTO

REV (S617)1-514-864microswitch, PLAY-FF,STOPS610 (upper)S602 (tower)1-514-864microswitch, PLAY-FF, STOPS604 (upper)S612 (tower)1-514-864microswitch, AUTO (1)SHUT-OFF (S609)Y-20410-12-9counter, tape index

Chassis - Top View- 1-514-864microswitch, PLAY, FF-STOPS614 (upper)S605 (tower)1-514-706switch, leaf;PLAY-FF,STOP(S613)1-514-707switch, leaf;PLAY-FF,STOP(S620)

1-454-075solenoid, plunger(PM601};PINCH ROLLER1-514-864microswitch,AUTO SHUT-OFF(S618)

1-222-497resistor, variable;30kQ(O},R131(AUX-L)

1-222-498resistor, variable;10kQ (O), R135(MIC-L)

3-497-207pinch roller 1-222-498resistor, variable/10kQ (O), R235(MIC-R)

Chassis - Bottom View-1-441-759

X-34970-66mounted circuit board, relay

8-828-629-20head,record/erase(ERP102-2902)8-829-142-20head,playback(PP102-4202)1-222-497resistor, variable;30 kQ (O), R231(AUX-R)

1-454-074__L solenoid, plunger (PM602)

brake8-836-624-07- 4 - - - - - - - - - - - motor, reel (M2);UC-624KX-34970-65- - - i - - - - - - - - - - - mounted circuit board,power supply

- - - 4 - - - - - - - - - - - X-34970-68mounted circuit board,servocontrol1-454-074solenoid, plungerdirection change

X-34970-67-,,!+--- mounted circuit board,ESP

8-836-214-01

X-34970-61 X-34970-63mounted circuit board,playback amp.

mounted circuit board, mounted circuit board,bias oscecord amp.

-5-

X-34970-62mounted circuit board,record equalizer

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1-3. SWITCH LOCATION

S613PLAY-FFswitch (3)S620PLAY-FF,STOPswitch (4)

S618AUTO SHUT-OFFswitch (2)

S607FF switch

S619 (upper side)FWD-REV switch (2)S601 (lower side)FWD-REV switch (1)

S614 (upper side)PLA Y,FF-STOP switch (4)S605 (tower side)PLA Y_FF-STOPswitch (2)

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S610 (upper side)PLAY,FF-STOP switch (3)S602 (lower side)PLA Y,FF-STOP switch (1)S604 (upper side)PLAY-FF,STOP switch (1)S612 (tower side)PLA Y-FF,STOP switch (2)S609AUTO SHUT-OFF switch (1)S615PLA Yswitch (2)S616PLA Y switch (3)S608PLA Y switch (1)

S606STOPswitchS611FF switch (2)

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SECTDISASSEMB

2-1. Cabinet Removal

reel panel

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2-2. Head Deck Removal

1. Remove the FWD and REV lamps.2. Remove the five screws shown in Fig. 2-2. Lift

off the head deck.

temp(for FWD)lamp -~.... -....~---(for REV)

Fig. 2-2. Head deck removal2-3. Record Equalizer Circuit Board Removal

Fig. 2-3. Record equalizer circuit board removalNote: After reattaching, make the equalizer switch (5107)position adjustment (See page 15).

2-4. ReverseSwitch Circuit Board Removal

Fig. 2-4. Reverseswitch circuit board removalNote: Pay attention not to cut the head lead wires.

CAUTION:1) Install the playback and bias osc. circuit boards,

after the levers are perfectly hooked to the holesof the slider of the slide switches.

2) The lead wire of microswitch has a connector,which is connected to the other lead wire with aspecial jig.If the lead wire is cut or the connector is damaged,solder the lead directly to the micr osvvitch terminalwith an insulating tape wound around the terminal.

3) Never put the unit upside down on the hard platewith the head cover removed.The pin of the tapeshifter, the shut-off arm pin, the tension arm andothers will be bent because of the weight of theunit. If it is necessary to put the unit upside down,put it on a soft cloth with the head cover attached.

4) When replacing the chassis, cut threads on it with ahexagon tapping screw.

Part No.*7-685-146-31 (for 3 mm dia.)

(B P3 x8*7-685-159-04 (for 4 mm dia.)

(Bp 4 x8

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solenoid (PM602)position adjustment

(3-1-8) reel table heightadjustment

SECTION 3ADJUSTMENT PROCEDURES

3-1. MECHANICAL ADJUSTMENTS

(3"1-4) PLA Y, FF-STOP switch (S605,position adjustment

(3-1-18) REC lock pullrod adjustment (3-7 -12) brake torqueadjustment (3-1-5) PLA Y, FF-STOP switch (S602,610)

position adjustment

(3-1-8) reel table heightadjustment

(3-1-7) lock arm bracket positionadjustment

3-1-1) PLA Y-FF,STOP (S604, 612)position adjustment

(3-1-6) pinch rollersolenoid (PM601)position adjustment

capstan bearing position adjustment(See page 21)

tape contact check ofscrape filter roller

(3-1-19) equalizer switch (S107)position adjustment (3-1-21) PLAY switch (S615, 616)position adjustment

(3-1-13) direction changestopper adjustment

(3-1-2) AUTO SHUT-OFFswitch(S609, 618) position adjustment (3- 14)pinch rollerpressure adjustment

Fig. 3-1. Adjusting parts locations (1)

(3-1-11) FFandREWbacktension torqueadjustment

(3-1-10) FWD and REV backtension torqueadjustment

(3-1-16) FWD-REV switch(S601, 609) positionadjustment 1-15) direction switch joint

rod stroke adjustmen t

(3-1-18) REC lock pullrod adjustment

(3-1-17) record buttonblock adjustment

Fig. 3-2. Adjusting parts locations (2)

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3-1-1. STOP

Make the following adjustments by looseningthe two microswitch holding screws. See Fig. 3-3.After that, apply lock paint to them.1. STOP mode (Lock arm B is locked)

Make sure that the actuator of microswitch isperfectly pushed with the plate spring as shownin Fig. 3-3.

2. FWD or REV mode arm B is released.)The actuator of rnicroswitch should not bepushed by the plate spring at all.

3. STOP to FWD (or REV) modeS604 should be released approximately onesecond after S612 is released.

PLA Y-FF, STOP switch - S604)- S612

lock arm (8)

to be perstlet: release3-3. PLA Y-FF, STOPswitch

position612)

3-'-2. AUTO SHUT -OFF Switch (18) PositionAdjustment

1. Make sure that the bent portion of the actuatorpin is positioned vertically against the chassis.If necessary, adjust by bending the base of thepin.

2. Loosen the two micro switch holding screws.Adjust the position of the microsw itch so thatthe switch is turned ON by the actuator pin atthe position shown in 3-4.

3. Apply lock paint to the screws.

Note:Adjust for both AUTO SHUT-OFF switch in

the same way.

AUTO SHUT -OFF switch (136GB)

tape

here.

screw

o "-'O.5mm(O~1164")bV bending here.

actuator

Fig. 3-4. AUTO SHUT-OFF switch (S609,618)position adjustment

3-1-3. BrakeSolenoid (PM602) Position Adjustment

1. Turn OFF the power. Unhook either end of thespring and loosen the four solenoid holdingscrews. See Fig. 3-5.

2. Push the solenoid shaft to the full with a handin the direction shown by the arrow. Adjust theposition of the solenoid so that the clearancebetween the timing lever and the lock lever isO to 0.5 mrn (1/64"). Make this adjustmentperfectly otherwise an unusual noise is producedbecause of the vibration of the brake lever.

3. Hook the spring again and turn ON the power.Change the mode from FWD (REV) to STOPand vice versa several times. Make sure that theunusual noise is not produced. Adjust theposition of the solenoid, if necessary.

4. Apply lock paint to the screws.

screwsolenoid

(PM602)

timing lever

positioning.\

Unhook either end of SPrin:: ~~. stopper.; spring

Fig. 3-5. Brake solenoid (PM602) positionadjustment

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3'-4. PLAY,FF8TOPSwitch (S605,614) PositionAdjustment

1. Place the unit in the FFor REW mode, to ener-gize the brake solenoid. Check to see that theactuator of microswitch is perfectly pushedwith the plate spring and also that the noclearance between the microswitch and the platespring is obtained as shown in Fig. 3-6.If necessary, adjust the position of the micro-switch by loosening the two switch holdingscrews.

2. Apply lock paint to the screws.Note:

Be careful not to turn OFF the microswitch withthe solenoid energized, as the thermistor (Pth601) onthe relay circuit board will be damaged because of anunusual current.

PLA Y, FF-STOP sw~~ch(lower - S605)upper - S614

screw

/,actuator~~~~~~~~g~~ .s.no clearance

' 1 f t - ,plate springFig. 3-6. PLA Y, FF-STOP switch (S605,614)

position adjustment3-1-5. PLAY,FF-STOPSwitch (8602, 610) Position

Adjustment1. Place the unit in the FF or REW mode, to

energize the brake solenoid. Check to see thatthe actuator of microswitch is perfectly pushedwith the timing lever as shown in Fig. 3-7.If necessary, adjust the position of the micro-switch by loosening the two switch holdingscrews.

2. Apply lock paint to the screws.actuatortiming lever

PLA Y, FF-STOP switch(upper - S610)lower - S602

Fig. 3-7. PLA Y, FF-STOP switch (S602,610)position adjustment

3-1-6. Pinch Roller Solenoid (PM601) PositionAdjustment

1. Loosen the three solenoid holding screwsshown in Fig. 3-8.Place the unit in the FWD or REV modeto energize the solenoid. Adjust the position ofthe solenoid so that the clearance between thepinch roller pressure adjusting plate and theplunger solenoid drive arm is 0.5 mm(l/64")to 1 mm (3/64'\ Tighten the screws. Thesolenoid shaft should be attracted straight onthe line and in parallel with the solenoid.

2.

3. Apply lock paint to the screws.screw

Adiust bv positioning.

plunger solenoiddrive arm pinch roller pressureadjusting plateFig. 3-8. Pinch roller solenoid (PM601) position

adjustment3-1-7. Lock Arm Bracket Position Adjustment1. Make sure that the clearance between the lock

arm (A) and the lock arm (B) is 0.5 ~ 1 mm0/64,....._ 3/64") in the FWD (or REV) mode.In the STOP mode the clearance between thelock arm (A) and the lock arm (B) should beapproximately 1 mm (3/64'\ See Fig. 3-9.Loosen the two lock arm bracket holding screws,if necessary. See Fig. 3-9.Adjust the position of the lock arm bracket.Tighten the screws.

2.

3.

4. Apply lock paint to the screws.

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arm bracketock arm (A)

lock'arm (8)

STOP mode FWD mode

Fig. 3-9. Lock arm bracket position adjustment3-1-8. Reel Table Height Adjustment

I. Use a 7 inch reel.2. Thread the tape along the tape path. Place the

unit in the FWD mode. If the tape toucheseither flange of the reel, adjust the reel tableheight by loosening the two set screws with anallen wrench. Here the both upper and lowerclearances between the tape and the reel flangeshould be the same.

3. Tighten the set screws.

7" reel

Fig. 3-10. Reel table height adjustment3-1-9. Servo Control Circuit Board Position

Adjustment

1. Loosen the two servo control circuit boardholding screws shown in Fig. 3-11. Set the tapespeed switch to the 9.5 cm/s (3-3/4 ips) position( center).

2. Thread the tape along the tape path. Place theunit in the FWD mode. Adjust the position ofthe servo control circuit board together with theheat sink so that the TAPE SPEED is9.5 em/so Tighten the screws.

3. Make sure that the tape speed changes definite-ly, when the TAPE SPEED switch is slowlychanged to the 4.8 cva], 9.5 cm/s and 19 cm/spositions. Readjust the position of the servocontrol circuit board, if necessary.

4. Apply lock paint to the screws.

servo controlJ-circuit board, (under chassis)

TAPE SPEEDknob

Fig. 3-11. Servo con trol circuit board positionadjustment

3-1-10. FWD and REV Back Tension TorqueAdjustment

Note:Instructions in [ [are appl ied to the REV back

tension torque adjustment.

1. Place a ]" reel with string wound several turnscounterclockwise l clockwise 1 onto the FWD[REV] supply reel table. Tie the string to thespring scale.

2. Measure the back tensions by pulling the 0 to400 g (14 oz) spring scale at approximately9.5 cm/s (3-3/4 ips) speed in FWD [REV]mode. See Fig. 3-12.It should be 200 to 240 g.cm (2.78 to 3.32 oz.inch).

3. Adjust the slider of R609 by loosening thescrews, if necessary.

pull a scalereel

oz. inch)

Fig. 3-12. FLII/D and ,c ( EV back tension torqueadjustment

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FWD back tensionarii.

at

F and REW backtension torque adj.

Fig. 3-13. Back tension torque adjusting parts location3-1-11. FF and Rewind Back Tension Torque

AdjustmentNote:

Instructions in [ 1 are applied to the REW backtension adjustment.

1. Place a 7" reel with string wound several turnscounterclockwise [clockwise 1 on the hub ontothe FF [REWl supply reel table. Tie thestring to the spring scale.

2. Measure the back tension by pulling the 0 to400 g (14 oz) spring scale at approximately9.5 cm/s (3-3/4 ips) speed in FF [REWlmode. See Fig. 3-12. It should be 60 to80 g-em (0.83 to l.ioz inch).Adjust the slider of R60S by loosening thescrew, if necessary.

3.

3-1-12. Brake Torque AdjustmentThis adjustment should be performed for both

supply and take-up sides.

Note:Instructions in [ 1 are applied to the take-up

brake torque adjustment.

t2.

Place the unit in the STOP mode.Place a i' reel with string wound several turnscounterclockwise [clockwise 1 on the hub onto

brake plate.spring

3.the reel table. Tie the string to a spring scale.Pull the scale in the direction shown by thered arrow, making sure that the string doesnot touch either flange of the reel. The reeltable will rotate counterclockwise [clockwise J .Take a reading only when the reel table is insteady motion.

4. The scale reading should be 900 g.c m (12.5 oz.inch) to 1,200 g.cm (16.7 oz.inch).

s. Rewind the string by turning the reel clockwise[counterclockwise).

6. Turn string several times clockwise [counter-clockwise) on the hub onto the reel table.

7. Pull the scale in the direction shown by theblack arrow, making sure that the string doesnot touch either flange of the reel.The reel table will rotate clockwise [counter-clockwise]. Take a reading only when the reeltable is in steady motion.

S. The scale reading should be 300 g.cm (4.17 oz.inch) to 400 g.cm (5.55 oz.inch)

9. If the satisfied results are not obtained, adjustby changing the hooking position of spring.

Specification:Brake Torque of Supply Reel

in clockwise turning ..... 300-400 g.crn(4.17-5.55 oz.inch)

in counterclockwise turning .900-1,200 g.crn

(12.5-16.7 oz.inch)

Brake Torque of Take-up Reelin clockwise turning .... 900-1,200g.cm

(12.5-16.7 oz.inch)in counterclockwise turning .

300-400 g.crn(4.17-5.55 oz.inch)

900~ 1200g. cm(12.5~ 16.7oz.(

300 'V400 g. em(4.17~ 5.55

brake adjustingarm

900 -c- 1200g. cm(12.5~ 16.7oz- inch)1300~ 400 g. cm(4.17~ 5.55oz- inch)weak~* reel table

Fig. 3-14. Brake torque adjustment-13-

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3-1-13. Direction Change Stopper PositionAdjustment

1. Loosen the stopper holding screw.2. Place the unit in the FWD (or REV) mode.

Adjust the position of the direction changestopper so that the clearance between thestopper and the tape direction change lever is4 mm (5/32'').

3. Change the mode from FWD to REV and viceversa several times. Make sure that the positionof the pinch roller changes when the mode ischanged.

4. Apply lock paint to the screws.pinch roller

FWD mode.direction change lever

screw,/

directionchange stopper (L J ~~"directionchange stopper (R)

4 mm (5/32")in REV mode

4mm (5/32")in FWD mode

Fig. 3-15. Direction change stopper positionadjustment

3-'-14. Pinch Roller Pressure Adjustment1. Make a loop in a piece of string and attach theo to 1,600 g (3 1b 8 oz) spring scale around the

base of the pinch roller shaft. See Fig. 3-16.Pull the scale. The pulling direction should bealigned with the pinch roller shaft and thecapstan. Check the reading when the pinchroller just stops rotating. It should be 1,200 to1,400 g (42 to 49 oz ). If necessary, change thehooking position of the spring.

strong tAdjust by changing the hooking position.

./

weak

-14-

REV mode FWD mode

spring scale /

Fig. 3-16. Pinch roller pressure adjustment

3-1-15. Direction Switch Joint Rod Stroke AdjustmentI. Place the unit in the STOP mode. Push the tip

of the direction switch lever slowly in thedirection shown by the arrow in Fig. 3-17 asfar as the slide switches on the playback and thebias osc. circuit boards are changed. (Do notmove the position of switch).

2. Push the REV button. Make sure that the tip ofthe lever is pushed moreover by 0.5'"'-' I mm(1/64 -3/64") in the direction shown by thearrow by the solenoid.

3. Change the mode from the FWD to REV andvice versa several times and make sure that theslide switches are changed perfectly.

4. Change the position of direction switch jointrod to the direction change lever if necessary.

O.5~ 1mmdirection switch joint rod (1/64 'V3/64")

/~~=~=c\,;=======pp; }fo~~~~~d.sition of

_directionswitch lever

Remove direction switch joint rodby bending here.

Fig. 3-17. Direction switch join t rod strokeadjustment

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3-'-16. FWD-REV Switch (8601,619) PositionAdjustment

1.2.

Loosen the two screws.Place the unit in the REV mode to energize thedirection change solenoid.

3. Adjust the position of the microswitch so thatactuator is perfectly pushed with the joint

plate. Tighten the screws.4. Apply Lock paint to the screws.

direction solenoidPM603

plurlgerjoint plate

'FWD-REV switch(upper - 5619)lower - 5601

Fig. 3-18. FWD/REV switch (S601, 619) positionadjustment

3-1-17. Record Button Block Adjustment1. See Fig. 3-19. Place the unit in the STOP mode.

Check to see that the clearance between theREC button block and the record arm holderis 0.5 (1/64") to 1 mm (3/64''). If necessary,adjust the position of the REC arm holder byloosening the screws.

2. Make sure that the slide switches (SI03, 104)on the bias circuit board are perfectly switched,when the REC button is locked. Readjust theclearance between the REC button block andthe REC arm holder, if necessary.

3. Apply lock paint to the screws.

REC button

-~l! 0.5",1 mm________/ (1/64'" 3 /64")(When the RECbutton released)"record arm holder

REC switch(5103, 104)

-,

bias osc ~ircuit board

Fig. 3-19. Record button block adjustment-15-

3-'-18. REC Lock Pull Rod AdjustmentI. Place the unit in the STOP mode. Turn the split

nut clockwise until the tip of the REC lock pullrod is in contact with the REC lock rod.Moreover, turn the split nut slowly one or twotimes after the tip of the pull rod is in con-tact with the REC lock rod. Press the nut byusing a pliers.

2. Make sure the followings.a) Lock the REC button in the STOP mode. The

REC button is released when the FWD or REVbutton is pushed.

b) Lock the REC button slowly in the STOP mode.The REC lamp lights before the button islocked.

c) Lock one of the two REC buttons in the STOPmode. The button is released when another islocked.

3. Apply contact cement to the nut.

spring.Split nut

@

~_'. _REG 10" poll rod

~.__.REClock rod

no clearancein 5TOP mode T

Fig.3-20. REG lock pull rod adjustment3-'-19. Equalizer Switch (S107) Position Adjustment1. Loosen the two screws as shown in Fig. 3-21.

Set the tape speed switch to the 9.5 cm/s(center) position.

2. Move the screws so that the equalizer switch isset at the 9.5 cm/ s (center) position.Change the tape speed switch to the 4.8 cm/s,9.5 cm/s and 19 cm/s positions and vice versaseveral times. Make sure that the equalizerswitch is definitely changed.

3.

4. Apply lock paint to the screws.

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equalizer switchS107

","__,"/ sc re w

r 0 ~ c @p=====VUmeter (L-CH)

Fig. 3-21. Equalizer switch (STOl) positionadjustment

3-'-20. PLAY-FF, STOP Switch (S613, 620)Position Adjustment

1. Place the unit in the STOP mode. See Fig. 3-22.Make sure that the distance between theplunger joint plate and the leaf A of the leafswitch is 0 to 0.5 mm (1/64''), and also that theleaves A and B are in contact with each othercompletely. If necessary, adjust the switchposition by loosening the screws.

2. Place the unit in the FWD (or REV) mode, toenergize the pinch roller solenoid. Make surethat the leaves A and C are perfectly in contactwith each other.

3. Apply lock paint to the screws.

"LA Y-FF, STOP switchS620 S613

plunger ..-- __joint plate

0-v0.5mm(0 'V1/64")

Fig. 3-22. PLA Y-FF, STOP switch (S613, 620)position adjustment3-1-21. PLAY Switch (S615, 616) Position

Adjustment1. Make sure that S615 (S616) is turned ON when

the FWD (or REV) button is pushed and alsothat it is turned OFF when the button isreleased. If necessary, adjust the position ofPLAY switch S615 (or S616) by loosening the

-16-

screw A (or screw B) in Fig. 3-23. Make surethat the switch is not turned ON by the play ofthe FWD button.

2. Apply lock paint to the screws A and B.FWD or REV button

~S615}PLAY .// ,S616 switch

screw(forS615)Fig. 3-23. PLA Y switch (S615, 616) position

adjustment3-1-22 Adjustments after Head ReplacementFor FWD Direction

When replacement of more than two heads isrequired, leave one of them unremoved for the refer-ence of adjustments. Do not remove all the heads atthe same time.A) Playback Head Replacement1. Replace the playback head by removing the

angle adjusting screws. See Fig. 3-26.Do not move the height and zenith adjustingscrews.

2. Play back the alignment tape (J-19-A2).Make the azimuth and angle adjustments.See page 23.

3. Paint the head core with black ink as shown inFig. 3-24.

record/erase playback

P . ; " ' ~ ~ : J ~ J O O M o dover these .COparts. incorrect-, correct@11I: : ; ; ; - : 3 t tepe

I~.' .heightzenith _// adjustingadjusting screw screw

Fig. 3-24. Head zenith and height adjustment

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4. After the ink dried, run the tape in the FWDdirection for 20 to 30 seconds. Watch the inkon the core fading away. When the same wide a-mount of the faded away part cannot beobtained at every point, turn the zenith andheight adjusting screws in the direction shownby the arrows. See Fig. 3-24.Repeat this step several times until the satisfiedresult is obtained. After the adjustment cleanthe core with a soft cloth dampened with de-natured alcohol.

3. Paint the record/erase head cores with ink asshown in Fig. 3-24.After the ink dried, run the tape in the FWDdirection for 20 to 30 seconds. Watch the ink onthe core fading away. When the ink does notfade away in the same wide amount at everypoint, turn the zenith and height adjustingscrews in the direction shown by the arrows.See Fig. 3-24. Repeat this step several timesuntil the satisfied result is obtained. Afteradjustment clean the cores with a soft clothdampened with denatured alcohol.. For the record head tracking adjustment, con-

nect a VTVM and a 100 kSl resistor in parallelwith the LINE OUT jack, deliver the I kHzsignal (-60 dB) to the MIC jack. Set theMONITOR switch to the TAPE position. Placethe unit in a normal stereo record mode.Turn the record head zenith and height adjust-ing screws in the same amount of the same di-rection so that the same maximum output canbe obtained at both channels.

4.

5. Make the record head azimuth adjustment again.See page 24.

6. Play back the alignment tape (J-19-A2), andmake the playback azimuth adjustment again.

6. Make the record head track adjustment. Seepage 25.

7. Make the playback level and equalizer adjust-ments. See page 23 and 24.

7. Make the record bias adjustment, overall fre-quency response and erase ratio Measurement.

8. Apply lock paint to the adjusting screws.

8. Make sure that the positioning relation betweenthe head core and the tape is correct. SeeFig. 3-25.

9. Apply lock paint to the adjusting screws.For REV Direction

The tape guide (4), which is used for the REVB) Record/Erase Head Replacement tape path adjustment, should not be adjusted in the

head replacement.1. Remove the azimuth adjusting screw and the

head holding screw (with spring). Replace thehead with the mounting plate. Do not move thezenith and height adjusting screws.

2. Make the record head azimuth adjustment.See page 24.

for FWD

The adjustments after playback and record/erase headreplacement are the same in procedure as in the FWDhead replacement.

for REV tape. guide (5)

tape. guide (6)

Fig. 3-25. Head adjustment

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Checks After Mechanical Adjustment1. Torque Check

FWD, REV torque ... more than 200 g. ern(2.78 oz. inch)

FF, REW torque ..... more than 100 g. ern(1.39 oz. inch)

FWD, REV back tension.......... 200 - 240 g. cm*

(2.78-3.32 oz. inch)FF, REW back tension

.......... 60 - 80 g. cm*(0.83-1.1 oz. inch)* adjustable

2. After making adjustments, clean the followingparts with a soft cloth dampened with denaturedalcohol; head core, tape guide, pinch roller,scrape filter roller, brake contact part of thereel table.

3. Tape Contact Check of Scrape Filter Rollera) Thread a 7-inch tape along the tape path and set

the tape speed switch to the 4.8 cm/s position.b) Run the tape. Make sure that the scrape filter

roller is rotating. Stop the roller by fingers.Make sure that the roller starts rotating againwhen taking off the fingers from the roller.If necessary, adjust the position of the scrapefilter roller by loosening the screw.

4. Wow and Flutter MeasurementMake measurements at the beginning and theend of the tape. The measurement may be donewith the unit set to either FWD and REVmode.

-18-

*At 19 cm/s (7-1/2 ips) and 9.5 cm/s (3-3/4 ips)tape speed

Steps(1) Connect a wow meter and a 100-kn resistor II:.

parallel with the LINE OUT jack.(2) Set the MONITOR switch to TAPE.(3) Play back the alignment tape indicated below.(4) Make sure that the satisfied result is obtained

on the wow meter.

tape speed specification remarks19 cm/s less than Play back SONY(7 - ' 1 2 ips) 0.12 % alignment tape

(RMS) WS-19-79.5 cm/s less than Play back SONY(3-34 ips) 0.15 % alignment tape(RMS) WS-9-7*At 4.8 cm/s (1_7/8 ips) tape speed

Steps(1) Set the record volume controls to the position

specified in Precaution (8) on page 19.(2) Connect a wow meter and a 100-kn resistor in

parallel with the LINE OUT jack.(3) Set the MONITOR switch to TAPE.(4) Deliver a 3-kHz signal of -60 dB (-10 dB) to the

MIC (AUX) jack.(5) Record the signal on the blank tape.(6) Make sure that the satisfied result is obtained

on the wow meter.

Specification : less than 0.40 % (RMS)

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3-2. ELECTRICAL ADJUSTMENTS

Precaution:Before making adjustment, make sure to read

the following carefully.(1 Equipment to be required are as follows:

Audio oscillator (AF OSC)Attenuator (A TT)VTVMOscilloscopeDigital freq uency counterSONY alignment tape*J-19-A2 (for head azimuth and angle adj.)*J-19-F2 (for 19cm/sleveland equalizer adj.)* J-9-F1 (for 9.5 cm/s level and equalizer adj.)*SPC-47 (for tape speed adj.)Fixed resistors

600 Q, 300 Q, 10 kQ, 100 kQ(2) SONY alignment tapes contain the following

information in the sequence indicated.~ 1st 20d Jrd 4th 5th 6th 7the1-19-A2 12.5 kHz. 10dB

400 liz 400 III 10 kill 1'5 kll 7 k l lz 80 I II 40 HzJ-J9-F2 o dB 10dB 10dB 10dB 10 an 10 dB 10 dB5kllz 400 HI 400 Hz 5 k Hz J kHz .:'00 Hz 80 litJ-9-FI 10dB o dB 10 dB 10 dB 10 dB 10 dB 10 dB

SPC-47 4 kill, 0 dB

(3) Make sure to demagnetize the record/erase andplayback heads with a soft cloth dampenedwith denatured alcohol.

(4) Make sure to demagnetize the record/erase andplayback heads by using a head demagnetizer.

(5) Equipment ConnectionInput side

audiooscillator L-CH MIC or

AUX IN jackL-CHRECamp.

InputMIC

AUX IN

RxOQ10 kQ

-19-

Output sideL-CH LINEOUT jack/

(6) Input and output levels are specified as follows,unless otherwise specified.Normal input level MICRO-

PHONESignal source impedance 300 QInput signal level -60 dB(0.775 mY)

AUX IN10 kQ-10dB(0.245 V)

Normal output level

Load resistorOutput level

LINE OUT100 kQo dB (0.775 V)

(7) The switches should be set to the followingposition, unless otherwise specif ied.*T APE SPEED -- 19cm/s (71/2 ips)*T APE SELECT -- NORMAL*AUTO REV NON REV

(8) The record volume controls should be set tothe following position, unless otherwise speci-fied.*MIC volume control (In using the MIC jack)

Turn the AUX volume controls fully counter-clockwise, set the MONITOR switch toSOURCE and deliver a 1 kHz signal of -60 dB(0.775 m V ) to the MIC jack. Adjust the MICvolume controls so that the VTVM readsOdB(0.775 V).

* AUX volume control (In using the AUX IN jack)Turn the MIC volume controls fully counter-clockwise, set the MONITOR switch toSOURCE and deliver a 1 kHz signal of-10 dB (0.245 V) to the AUX IN jack.Adjust the AUX volume controls so that theVTVM reads 0 dB (0.775 V).

(9) The adjustments should be performed in thesequence, unless otherwise specified.

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FWDplaybackhead angle nanrsrrnoscrew

height adjustingscrewazimuth adjusting 1screwheight adjusting

REVREC/ERASEhead

FWDREG/ERASEhead 1 ::::th adjusscrewheight adjustingscrew ~--"~--~"-"-""~-"-"

zenith adjustingscrewazimuth adjustingscrewangle adjustingscrew

screwscrew

REVplaybackhead

angle adjustingscrewscrew"__"""_zenith adjustingscrew

Fig. 3"26. Adjusting parts location (1)tape speed adj.

Set atDC 50~~250 Vrange.

reverse time J'fadj. (R 711)voltage adj.(Rl11 ;

ESP adj.

voltmeter

checking pointcapstan bearingposition adj.

servo controlcircuit boardFig. 3"27. Adjusting parts location (2)

trap coil adj.

19 cm/splaybackequalizer adj.

record bias adj.R317(REV-Lj

9.5 cm/s playback { R321equalizer adj. C509 } REV bias .frequency adj.

record leveladj.

9.5 cm/s playback { R421equalizer adj. L505(REV-R)playback leveladj.

VU metercalibration dummy coil adj.

Fig. 3-28. Adjusting parts iocation i3j

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Items Remarks Procedures1. DC B+ Test Setup: (1) Place the unit in the STOP mode.

Voltage (2) Adjust R603 to obtain 24 0.5 Von the voltrne-Adjustment ter (20 kS1/V).CAUTION:

Do not short-circuit between B+ circuit andground, or transistor Q602 will be broken.

seDC 50 V range

Specification: 24 0.5 VNote: Make sure that ac power source voltage

is correct.2. Tape Speed Test Setup: (1) Play back the beginning of SONY alignment tape

Adjustment SPC-47 in horizontal position.frequencycounter (2) Adjust R901, R903 and R905 for the counter

reading shown in the table below.~_ ..........'-"-0_----

LINE OUT jacktape speed allowable adjustingrange parts

19 csu] (7-1/2 ips) 4000 Hz 5 Hz R901 10 kr! (B)9.5 emls (3-3/4 ips) 2000 Hz 3 Hz R903 20 kr! (B)4.8 cmls (1-7/8 ips) 1000 Hz 2 Hz R905 50 kr! (B)

SPC-47Switch Setting:

MONITOR switch ..... TAPE

Specifications (3) Make sure that the specifications shown in lefttable is satisfied at the beginning and end of tapein forward and reverse mode, with the unit placedin both horizontal and vertical position.

tape speed counter reading19 emls 4000 40 Hz ( 1%)(7-1/2 ips)9.5 emls 2000 20 Hz( 1%)(3-3/4 ips)4.8em/s 100020Hz(2%)(1-7/8 ips)

Note: Take the reading of a frequency counterafter more than 5 seconds since the semi-fixed resistor has been finished to turn.

3. Capstan Test Setup:BearingPositionAdjustment 0902

C91110J l

0903160 V

(1) Place the unit in the STOP mode.(2) Loosen the two capstan bearing holding screws.(3) Adjust the position of the capstan bearing so that

the voltmeter reads a maximum.(4) Tighten the screws and apply lock paint to the

screws.(See Fig. 3-1)

checking point

Specification:voltmeter reading .. ... maximum

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Items Remarks

o

Procedures4. ESPAdjustment

Test Setup:(1) Connect a voltmeter (20 kst/V) between

checking point and ground.

reversetime adj.r>. R ! 5-y

1 9 t@ >- .et at DC 50 V rangevoltmeter

0) Set the AUTO REV switch to CONT REV.(2) Deliver a 1 kHz of -43 dB (5.5 mY) to R-CH

LINE OUT jack.(3) Place the unitin the forward mode.(4) Adjust R7H to obtain 100.5 V on the voltrneier.

Note: Read after the indication of the vol-tmeter has been steady.

(5) Thread a blank tape.(6) Change the input level from -43 dB (5.5 mV)

to -33 dB (17 mY).(7) After passing more than 3 seconds since the level

is changed, adjust R717 so that the tape transportdirection will reverse at 6 - 10 seconds afterchanging to -63 dB (0.56 mY) from -33 dB(17 mV) again.

(8) Repeat the above steps (2) through (7) so that thetape transport direction will be able to reversesurely in opposite direction.

(9) With the AUTO REV switch set to REV position,repeat the above steps (6) and (7) and make surethat the tape transport direction of the unitreverses.

(10) When changing the AUTO REV switch to NONREV, make sure that the tape transport directionof the unit does not reverse.

r;;; D703f ::,=.~""'Nj.II'-"'_""~Q-f"704

s. VU MeterCalibration

i(2) Deliver 1 kHz signal to R-CH LINE OUTjack.

AF osc 100 kS1~! g1kHz T LINE OUT (R)

Specification:Voltage at checking point ..... 10 0.5 VReverse time 8 2 sec

Test Setup:

VTVM~ R Q T Q r o \ I IMIC jack LINE OUT jack

./. VU meter7 '7'"

R334, R434Switch Setting:MONITOR switch ..... SOURCE

Specification:o 0.5 on the VU meter scale when the lineoutput is 0 dB (0.775 V).

-22-

(1) Deliver a 1 kHz signal of -60 dB (0.775 mY) tothe MICjack.

(2) Place the unit in the stereo-record mode.(3) Adjust the MICvolume control for 0 dB (0.775 V)

on the VTVM.(4) Adjust R334 and R434 so that the pointer of VU

meter stays at 0 0.5 VU on the meter.(5) When changing the frequency from 1 kHz to

100 Hz and 10kl!z, make sure that the VU meterreads between -1 and +1 on the meter.VUmeter

1/

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Items6. Playback

HeadAzimuth andAngle

! ~ Adjustment

RemarksTest Setup:

Switch Setting:MONITOR switch ..... TAPE

Procedures(1) Play back the SONY alignment tape J-19-A2

(12.5 kHz).(2) Adjust the playback head azimuth adjusting screw

for the maximum output on the VTVM.Note: If the maximum value for both channels can

not be obtained at the same angle of thescrew, take the mid between the two anglesand make sure that the defference betweenthe output obtained by turning the screwfrom the maximum output position and theeach maximum output is within 0.5 dB.

(3) Loosen the playback head angleadjusting screws.(4) Slightly, hold the supply reel table by the hand.(5) Adjust by moving the playback head in the

direction shown by the arrows (See Fig. 3-26) sothat the level fluctuation is the least at the maxi-mum output and the playback output does notincreasemore than 0.5 dB.

(6) Repeat the above steps (1) and (2).(7) Apply lock paint to the azimuth and angle

adjusting screws.within 0.5 dB

output i____ i C - - ' -evel _. ~ I ... _ _ ._-1-7-: I : \Wltntn U.tJOI:>I -1--\ " - t_I I II I Iil'adjusting bOint screw angle

7. PlaybackLevelAdjustment

Specification:Screw position where the maximum output isobtained.

Notes:(1) Before the adjustment, make sure that the

head comes in contact with the tape normal-ly in forward mode.

(1) Set the TAPE SELECT switch to NORMAL.(2) Play back the 1st tone (400 Hz, 0 dB) of the

SONY alignment tape J-19-F2.(3) Adjust R316, R317, R416 and R417 for 0 dB

(0.775 V) on the VTVM.R316 (L-CH forward run)R416 (R-CH forward run)R317 (L-CH reverse run).R417 (R-CH reverse run)

(4) When changing the TAPE SELECT switch toSPECIAL, make sure that the VTVM readsbetween -2.5 dB and -1.5 dB (0.58 V and0.64 V).

Test Setup: VTVMJ~~: :J~I19F2Switch Setting:

MONITOR switch " TAPESpecification:

o dB (0.775 V) " NORMAL-2.5",-1.5 dBagainst NORMAL

...................... SPECIALNote: The adjustment should be performed for

both L-CH and R-CHin forward and reversemodes.

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Items Remarks Procedures8. Playback

EqualizerAdjustment

Test Setup:Same as Item 7

Switch Setting:MONITOR switch TAPE

Specification:Deviation against 400 Hz of 2nd tone

,----~--:-::-=-----, Iat 19 emls tape speed with J19F2tape ! 3rd 4th 5th 6thtonefrequency 10 kHz 12.5 kHz 7 kHz 80 Hzoutput ~ 2 dB 2 dB 2 dB +3 dBlevel R + I dB

7th40 Hz+ 5 dBOdB

(1) Set the TAPE SPEED switch to 19cm/s (7-1/2 ips).(2) Play back the 2nd (400 Hz) and 3rd (10 kHz) tones I

of SONY alignment tape J-19-F2.

(3) Adjust R319, R320, R419 and R420 so that theplayback output of the 3rd tone is the same as

Deviation against 400 Hz of 3rd tone

that of the 2nd tone.R319 (L-CH forward run)R419 (R-CH forward run)R320 (L-CH reverse run)R420 (R-CH reverse run)

at 9.5 em Is tape speed with ]9-Fl4th Sth sth I 7th5 kHz 3 kHz 200Hz I 80 Hz2 dB 2 dB I 2 dB I 2 dB

(4) Play back the 4th (12.5 kl-lz), 5th (7 kllz), 6th(80 Hz) and 7th (40 Hz) tones of SONY alignmenttape J-19-F2 in order.

(5) Make sure that the each deviation against 400 Hzof 2nd tone is within specification shown in theleft table.

(6) Set the TAPE SPEED switch to 9.5cm/s II(3-3/4 ips).

(7) Play back the 3rd (400 Hz) and 4th (5 kHz) tonesof SONY alignment tape J-9-F 1.

tapetonefrequencyoutput u..I deve! I R

'

I Notes:(1) First, 19cm/s(7-1/2 ips) equalizer adjustment

should be performed.(2 ) The adjustment should be performed for

both L-CH and R-CH in forward and reversemodes.

(8) Adjust R321 and R421 so that the playback outputof the 4th tone is the same as that of 3rd tone.

R321 (L-CH forward run)R421 (R-CH forward run)

(3) Level difference between the forward andreverse modes should be within 1 dB.

(9) Play back the 5th (3 kllz), 6th (200 Hz) and 7th(80 Hz) tones of SONY alignment tape J-9-Flin order.

I1(10) Make sure that the each deviation against 3rd(400 Hz) tone is within 2 dB as shown in the

left table.9. Record Head

Azimuth and]Angle IAdjustment

Test Setup: blank tape

A~' /51 -IMIC jack _-----------VfVMJ 5 - - ~ \ r n I~~ lLINE OUT jack

(1) Deliver a 15 kHz of -80 dB (77.5 /lV) to the MIC Ijack.

(2) Place the unit in the forward (reverse) mode.

Control/Switch Setting:

I ' (3) Adjust the record head aizmuth adjusting screwfor the maximum output on the VTVM.Note: If the screw is turned more than 1 turn,make the record head track adju strnent again.

The maximum value for both channels cannot be obtained at the same angle of thescrew, take the mid between the two anglesand make sure that the difference betweenthe output obtained by turning the screwfrom the maximum output position andthe each maximum output is within 2 dfl. I

"Record volume control......... specified position on page 19

*MONITOR switch TAPE

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Items Remarks ProceduresRecord HeadAzimuth andAngleAdjustment

Specification:*Screw position where the maximum output isobtained.

(4) Slightly, hold the supply reel table by the hand.(5) Make sure that the playback output does not

increase more than 3 dB. If not, adjust by movingthe record head in the direction shown by thearrows (See Fig. 3-26) so that the level fluctuationis the least at the maximum output.

(6) Apply lock paint to the azimuth and angleadjusting screws. _1_ithin 2dBoutput ,level 1-----

IT --rIIIII

IIIIII

I within 2dB--I--IIIIII

:10. Record Head

TrackAdjustment

0@0

o

!adjusting point screw angle

same phase 45'----------v--good wrongto anotherLINE OUT jack

Control/Switch Setting:*Record volume control

.......... specified position on page 19*MONITOR switch TAPE

Specification:*Lissajous figure on scope within 45 *Playback output maximum

Notes:(1) Before the adjustment, make sure that the

height of head is normal against the tape inthe forward mode.

-25-

(1) Thread a blank tape.(2) Place the unit in the record mode.(3) Deliver a 1kHz signalof -60 dB (0.775 mV)to the

MICjack.(4) Adjust the record head azimuth adjusting screw

so that the lissajous figure on the scope iswithin 45

(5) Carefully noting how many turns the screw isturned, adjust the record head height adjustingscrew for the maximum output on the VTVM.

(6) Turn the record head zenith adjusting screw in thesame direction by the same turns as noted in theabove step (5).Note: If the maximum value for both channels can

not be obtained at the same angle of thescrew, take the mid between the two anglesand then make sure that the level differencefrom the each maximum value is less than1 dB.

(7) Check the record head azimuth adjustment.

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Items Remarks ProceduresRecord Head (2)TrackAdjustment

Perform this adjustment after that for theplayback head was done.

11.Dummy CoilAdjustment

Test Setup: blank tape

- JIC jack -------J5/[j~~LINE OUT jack

RECAmpAF osc(1) Thread a blank tape.(2) Deliver a 20 kHz signal of -80 dB (77.S MV) to

the MICjack.(3) Place the unit in the stereo-record mode.(4) Note the VTVM reading.(5) Place only L-CH in the record mode.(6) Adjust LS04 slowly so that the VTVM reading is

the same as the value obtained in the step 4.

LS04 (L-CH forward run)LS03 (R-CH forward run)LS06 (L-CH reverse run)LSOS (R-CH reverse run)

12.Reverse BiasFrequencyAdjustment

------~+--I

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Items Remarks

(3) Adjust L507 and L508 so that the VTVM con-nected between the checking point and groundreads a minimum (less than -10 dB).

13.Record BiasAdjustment

Test Setup:

Control/Switch Setting:* Record volume control................ specified position on page 19

*MONITOR switch TAPESpecification:*0 +1 dB . . .. at peak bias point*0 2 dB .. .. playback output of 18 kHz sig-

nal against that of 1 kHz signalNote: The adjustment should be performed for

both L-CH and R-CH in forward and reversemodes.

Procedures(1) Turn C510, C511, C512 and C513 clockwise to

the full and return them approximately threetimes.

(2) Thread a blank tape.(3) Deliver a 1 kHz signal of -80 dB (77.5 IlV) to

the MIC jack.(4) Place the unit in the stereo-record mode.(5) Slowly, turn C510, C511, C512 and C513 clock-

wise, and the VTVM reading will go up and reacha maximum.So note the VTVM reading.

C510 (L-CH forward run)C5 11 (R-CH forward run)C512 (L-CH reverse run)C513 (R-CH reverse run)

(6) Change the input signal frequency from 1 kHz to18 kHz.

(7) Turn C510, C511, C512 and C513 further clock-wise so that the VTVM reading is the same as thevalue noted in the step (5).Note: Make sure that the VTVM reading does not

fall more than 1 dB from the maximumoutput obtained in the step (5).

(8) Apply lock paint to the trimmer capacitors.

14. Trap Coi land BiasLeakageAdjustment

Test Setup:A) Trap coil adjustment

Al Trap Coil Adjustment(1) Set the record volume control (MIC and AUX)

counterclockwise to the full.(2) Place the unit in the stereo-record mode.

VTVMr - - - - - - - r - - BL-CH I R-CHI'~-.hecking point I checking potnt

/ ,L-----.....''---''':-,-----.-r-r-r-r--r: -vI, /

bias osccircuit board

recordampcircuitboard @

playbackamp circuitboardG il

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Items Remarks ProceduresTrap Coiland BiasLeakageAdjustment

B) Bias leakage adjustment B) Bias Leakage Adjustment(1) Set the record volume control (MIC and AUX)

clockwise to the full.(2) Place the unit in the stereo-record mode.(3) Set the MONITOR switch to TAPE.(4) Adjust L301 and L401 so that the VTVM reads

a minimum (less than -35 dB).(5) Change the MO~ITOR switch to SOURCE and

make sure that the VTVM reads less than -35 dB.L301 (L-CH forward run)L401 (R-CH forward run)

15.Record Level Test Setup:Adjustment Same as Item 13

Specification:Less than -10 dB

(Trap Coil Adjustment)Less than -35 dB

(Bias Leakage Adjustment)Notes:(1) Use a non-metallic screwdriver.(2) Do not use shielded wire as the lead of

the VTVM.

Control/Switch Setting:Record volume control

specified position on page 19MONITOR switch TAPE

(1) Deliver a 1kHz signal of -60 dB (0.775 mV) to theMIC jack.

(2) Set the TAPE SPEED switch to 19 cm/s (7-Vz ips).(3) Place the unit in the stereo-record mode.(4) Adjust R127, R128, R227 and R228 so that the

VTVM reads 0 1 dB.R127 (L-CH forward run)R227 (R-CH forward run)R128 (L-CH reverse run)R228 (R-CH reverse run)

(5) When changing the TAPE SPEED switch to9.5 cm/s (3-3/4 ips) and 4.8 cm/s (1-7/8 ips)make sure that the VTVM reads 0 2 dB andthat the difference between L-CH and R-CH iswithin 2 dB.

(6) When changing a mode from stereo to monaural,make sure that difference between them iswithin 1 dB.

Specification:o 1 dB . . . .. Playback output at 19 cm/s

(7-1/2 ips) tape speedo 2 dB ..... Playback output at 9.5 cm/s

(3-3/4 ips) and 4.8 cm/s 0-7/8ips) tape speed

* The level difference between channels at9.5 cm/s and 4.8 cm/s tape speed

within 2 dB* The level difference between stereo-recordmode and monaural-record mode

........ ..... ... ... within 1 dBNote: The adjustment should be performed for

both L-CH and R-CH in forward andreverse modes.

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Items Remarks Procedures16.Playback SIN

RatioMeasurement

Test Setup:VTVMJ~ c S j N ~ ~ : J u l-/9-F2

Switch Setting:MONITOR switch .. " , TAPE

Specification:more than 48 dB in both FWDand REV modes

(1) Play back the 1st tone (400 Hz) of SONYalignment tape (J-19-F2).

(2) Note the VTVMreading.(3) Remove the aligIlment tape.(4) Hold the both actuators sothat the shut-off switch

is activated (a rubber band or piece of maskingtape will hold the actuator as though tape werethreaded on the unit).

(5) Place the unit in the FWD Of REV mode withoutthe tape threaded.

(6) Note the VTVMreading.(7) Make sure that the level difference between

step (2) and step (6) is more than 48 dB.(8) Reverse the power plug to the AC outlet and

repeat the step (1) through the step (6).(9) Make sure that the level difference is also more

than 48 dB.

17.Erase Ratio Test Setup:Measurement

AF osc blank tape~~r

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Items Remarks

Test Setup:

18. Crosstalk Test Setup:Measurement(betweentracks)

Control/Switch Setting:*Record volume control............ specified position on page 19*MONITOR switch TAPE

Specification:more than 60 dB

Note: Use awell-demagnet ized tape or a new tape.

Procedures(1) Deliver a 1 kHz signal of -50 dB (2.45 mV) to the

MICjack.(2) Record the signal on the tape in the stereo

record mode.(3) Note the VTVM reading.(4) Invert and reverse the reels.(5) Play back the tape.(6) Measure the VTVM reading at both L-CH and

R-CH LINE OUTputs.(7) Make sure that the difference between the step (3)

and the step (6) is more than 60 dB.

19. CrosstalkMeasurement(between AFoscchannels)

Control/Switch Setting:Same as Item 18

Specification:more than 45 dB

Note: Use a well-demagnetized tape or a new tape.

-30-

(1) Thread a blank tape.(2) Terminate the R-CH (L-CH) MIC jack with a

300 ~ resistor.(3) Deliver a I kHz signal of -50 dB (2.45 mY) to the

L-CH (R-CH) MIC jack.(4) Place the unit in the stereo-record mode.(5) Make sure that the level difference between L-CH

and R-CH is more than 45 dB.

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Iw

Iw'"

tv, . . .

0; ; ;: ; Q -J '" 8 '" l i t.. .. . '". . . . ' " " '" iF : : I : : : I :: : I : "' " iF N iF NN iFH-~I+Z H- H- H - + H- :;;w tTl O\w,~ W I W W W W ~.00.;':: 0. 0. 0. 0. 0."';.. '" ;.. ' " '" ' " ' " ' "- t-

1+ 1+ H- H- H- 1+ -eI ow ",w w w w "' w ' ". 0. co . 0. 0. 0- 13'" ' " ' " '" '" '" ;;;-

I + H- 1+ .. .I I I I "'w w OOW 000. "- 0. n'" '" '" :3;;;-

*~oz: :Jo:;0~.8 -

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i:I'"

i:3II>

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IwwI

f > f >. . . . . . . .. . .e nol> :te me, s:0' l>l> -I3 ol' 0Q.I:;, 5 >, G' )5~~ c. ~'c Cr III : : : 0~~2 S~ 5::;:0 Q' W ' l>)N ~~ '"0 s:Cf)oo

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~ ~2o(;

IwC J1I

ttlc. .a .

Iw0)I

~ [ I tL _ _~:: F:'~f;~ L _.J < . . o Jg~ ~ L _j-l~ ~

~;;;';~

-- ----~ --L__ --+ ~

~VIS3oc;a. . . .2 -o: : : ; .f)!:;: ;:

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ICA l00I

OJ~.oOJ'"8 ()

2.0.~II: i~i i_ ,'IIOJr-"

o

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f' . r : o .~ ~. . . .is :~ : J : l 0C::J CD Zg - (')0 -I. . . ."l a. z8 '. . . . l> G)

C!) 3 0~ ~o sI ::;' G)(') :xll:: l>=; :!X l s:01 : 1 >.. .Q.

-0"!:t>iii ~()~.CD8a

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- Component Side -

-39-

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P la y ba c k A m p .C i rcui t BOOrd ,@' l r-: : ' i l J f ;~ t - - l - I r - T ~G RN B RN R E DI

W H T iI,

Playback Am p.~ _-!--!--\- ---+_ !--+ W !!,H r:cT~ /~ B,= R~ N -+_---i-_-----i-T-'\Circu it B aard,@ W H T IRE D

4-2-2. Record Equalizer Circuit Board- Conductor Side -

WHT/BLKW H T / O RGW H T / G RN

5108( TA PE S E LE C T )S PE CIAL ~ NO RM AL B ias O SCC ir cu it B oa rd

~P la yb ac k A m p.C i rc u it B o ar d@37 36~P la yb ac k A m p.C ir cu it B oa rd

-40-

I R I G H T \

Printed Circuit BoardPart No. 1-581-041-11

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- Component Side -

-41-

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4-2-3. Playback Amp. Circuit Board- Component Side -

/-42-

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1IG1::01 -I

n \)~ ~O'S OJ CD OJo g s

_ 0 . . _ 3 . 3. a.

;::"8 (0'P gD ..

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2SC634A

E B

ID50

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C50930-v200P

v :: p:i ;;

"

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OJr-c:

E :dUU~Im---c:o(;-U-UO)'0O - u o- u 0.;P '" - . . " E ( N

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- Component Side -

-51-

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4-2-7. Power Supply Circuit Board- Component Side -

< ; . ) I. U /:( t

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I(J1wI

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I!E CD (")~G) g ~rn-u

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