photofact* folder
TRANSCRIPT
PHOTOFACT* FolderMOTOROLAMODEL VT71
VOL.CONT.
ON-OFF SWITCH FINE TUNINGCHANNELSELECTOR CONTRAST
CONT.
MOTOROLA MODEL VT71
TRADE NAME Motorola, Model VT71MANUFACTURER Motorola, Inc. , 4545 Augusta Blvd. , Chicago, 111.TYPE SET Television ReceiverTUBES SixteenPOWER SUPPLY 115 Volts, 60 Cycle AC RATING 115 Volts •TUNING RANGE- Channels 2 through 13
.96 Amps.
TABLE OF CONTENTS
Schematic
Chassis Top View
Parts List and Description
Alignment Instructions
Chassis Bottom View-Trans.,Inductor &Alignment Identification
Block Diagram
Voltage and Resistance Measurements
Page Page2 Chassis Bottom View-Resistor Identification 12,17
3 Chassis Bottom View-Capacitor Identification 13,16
5,8,11 Tube Placement Chart
6,7 schematic-Deflection Circuits
Disassembly Instructions4,9
10
14
Positioning of Feedback Spring on H;V. Rect.
Cabinet Rear View
15
18
19
19
19
II0 H
HOWARD W. SAMS & CO., INC. • Indianapolis 7, Indiana
"The listing of any available replacement part herein does not constitute in anycase a recommendation, warranty or guaranty by Howard W. Sams & Co., Inc.,as to the quality and suitability of such replacement part. The numbers of theseparts have been compiled from information furnished to Howard W. Sams & Co.,Inc., by the manufacturers of the particular type of replacement part listed.""Reproduction or use, without express permission, of editorial or pictorial con-
tent, in any manner, is prohibited. No patent liability is assumed with respect tothe use of the information contained herein. Copyright 1949 by Howard W.Sams & Co., Inc., Indianapolis 7, Indiana, U. S. of America. Copyright under In-ternational Copyright Union. All rights reserved under Inter-American CopyrightUnion (1 910) by Howard W. Sams & Co., Inc." Printed in U. S. of America
DATE 2/49-#493-16 SET #55-FOLDER #16
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CHANNELS
(CHASSIS TS-4F & LATER) 28.3 4 5 6 7 B&9 I(CHASSIS TS-4E A EARLIER) | 2 38.4 5 S.6 7 8&9
/SS\KC79.-~.iboo- CM
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A PHOTOFACT STANDARD NOTATION SCHEMATIC
© Howard W. Sams & Co., Inc. 1949
PAGE 2
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CONT
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ITEM
No.
VIV2A B
V3V4
V5
V6V7V8V9 V10
Vll
¥12
V13
VI 4
V15
V16
USE
RF A
mp.
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.2nd
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3rd
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Limi
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Audi
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p. -Vert
Osc.
Power
Oit put
Clip
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Vert. Output
H. V. Osc.
H. V.
Rect
.Picture
Tube
REPLACEMENT DATA
MOTOROLA
PART No.
6AG5
12AT7
7F8
6AG5
6AG5
6AG5
6AU6
6AU6
6AL5
12SN7GT
25L6GT
12SN7GT
12SN7GT
6SL7GT
25L6GT
1B3GT
7JP4
STANDARD
REPLACEMENT
6AG5
12AT7
7F8
6AG5
6AG5
6AG5
6AU6
6AU6
6AL5
12SN7GT
25L6GT
12SN7GT
12SN7GT
6SL7GT
25L6GT
1B3GT
7JP4
RMA
BASE
TYPE
7BD
9A 8BW
7BD
7BD
7BD
7BK
7BK
6BT
8BD
7AC
8BD
8BD
8BD
7AC
14G
NOTES
Used
in some
mode
ls.
Chassis TS-4B, C, D use 637 for AF Amp.
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05
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R18
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24
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26R
27R
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29R
30R
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33R
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5577
6R56
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ESI
STA
NC
EPR
I.602
26
02
3102
1702
4.5
2
Not
e 13
-Cha
ssls
TS-
4B u
ses
300
MM
F. '
,,,,„
- ,,
rpd
In
SEC.
1702
602
SE
C.l
90
02
SE
C.
232
MO
TOR
OLA
PAR
T N
o.
24
B4
80
309
24B
470154
358434819
(or)
25390138
24B
480209
1X
471212*
P'n
^p
RlR
T
S-4
B.
REP
LAC
EMEN
l
STA
NC
OR
PAR
T N
o.
C
&
D.
DA
TA
TH
OR
DA
RbO
NPA
RT
No.
Not
e 14
-Cha
ssis
TS-
4D u
ses
1000
MM
F.,
TS-
4K,
F,
H,
G,
J no
ne.
<pf1
1= ^
Ta,^
fnr^"\s
ne
t "u
sed
in
Cha
ssis
T
S-4D
, E
Not
e 15
-Use
d on
Cha
ssis
T
S-4B
, C
onl
y.
1™ «
s -a
r-
nN
ote
16-C
hass
is T
S-4B
use
s 15
00 M
MFD
, Tf
a-4C
us
es
1000
MM
FD,
TS-4
D u
ses
5000
MM
FD
^ -
.-N
ote
17-C
hass
is
TS-
4C u
ses
1000
MM
FD,
TS-
4E,
F,
G,
H.
J us
e no
neN
ote
la-C
has
sis
TS-
4E,
F us
e 50
M'iF
D.
Not
e 19
-Cha
ssis
T
S-4
3,
C u
se
.000
5 (a
j 60
00 V
. IT
EMN
ote
20-C
hass
is T
S-4E
, F
use
10 M
FD (g
) 35
0 V
. ..
No.
To
amb^
r in
clud
esL
300
MH
FD.
c<ic
acit
or (
F,
5,
H.
Ite.
T.
C7
7).
J
MER
ITPA
RT
No.
TR
AN
SF
OR
ME
R
(AU
DIO
OU
TP
UT
)R
AT
ING
IMPE
DA
NC
EPR
I.28002
SEC.
3.2
S:
DC
R
ES.
PRI.
2502
SEC.
.6S2
REP
LAC
EMEN
T D
AT
A
MO
TOR
OLA
PAR
T N
o.25K
470392
PA
RT
S
LIS
T A
ND
STA
NC
OR
PAR
T N
o.
A-3
37
6
TH
OR
DA
R'N
PAR
T N
o.
T22S
45
MER
ITPA
RT
No.
A-2
92
8
DE
SC
RIP
TIO
NS
CO
NT
INU
ED
ON
PA
GE
11
.
NO
TE
S
Hor
iz.
Blo
ck C
so.
Tra
ns.
Ver
t.
Blo
ck O
sc. T
rans
. §H
oriz
. Sw
eep
Pus
h-P
ull
Tra
ns .
AFC
Cou
plin
g T
rans
. TH
i V
olta
ge T
rans
.
00IN
STA
LLA
TIO
N
NO
TE
S ^ <r a:
MO
TO
RO
LA
MO
DE
L VT
71
CO
ILS
(R
F-IF
)P
AR
TS
LI
ST
AN
D
DE
SC
RIP
TIO
NS
(C
on
tin
ued
) CO
ILS
CC
ON
TJLd o
ITEM
No.
LlA B
L2A B
LOA B
L4A B C
L5ft B C
L6 L7 L8 L9A D
L10AB
LllAB C
L12
L13
L14
Lib
U6
L17
LISA B
an A
ifR. B C
L2QAB C
L21AB
L22AB
L23AB C
L24AB
L25AB C
L26
L27
L23
L29
L30A
B C
LSI
L32A B
L33
L34
USE
Ant. Input
ii ii
Ant.
Coi
l
ii n
ii n
ii ii
ii ii
ii n
ii ii
n n
ii n
"
«n
ii
RF Coll ,i
ii i
ii i
n t
n i
n i
ii ii
n n
RF Choke
Osc. Coi
l
ii ii
n n
n ii
n n
n n
n ii
n ii
ii n
n n
n n
n ii
n n
n ii
n ii
II
H
II II
II
II
"
II
RF Choke
1st
IF2nd
IF3rd
IF2nd Det.
Assy.
4th
IF2nd
Det.
Assy.
Sound
Take-
Otf
Peaking
11
Ratio
Det.
DC RES.
PRI.
.2S2
02 OSS
OS 02 OS OS.
02 02 02 OSS
OS,
OS.
02 02 no UK 02 OS!
OSS
OSS
OSS
02 OSS oa 02 OSS
02 02 02 QO OSS
02 OS Offl
OSS
02 02 02 02 02 OSS
02 02 02 02 02 02 .12
.62
.32
.32
.22
12 152
15S2
32
SEC.
.42
.62
REPL
ACEM
ENT DATA
MOTOROLA
PART N
o.S4A432232
24A471186
24K484872
24B90177
24K478293
24KS0178
84K478294
24K9Q179
24K478293
24K478294
24K90180
24K478294
24A471374
24A471374
24A471374
24K484373
24K90182
24K478292
24K90133
24K90185
24KS0184
24K478292
24K90185
24A471372
24A471373
24A471373
24A471373
24A90064
24K434874
24K90187
24Kii-890C3
24KS0188
24K90189
24K489004
24K90189
24K90190
E4K489004
24K90190
24A489188
24A471370
24A4B5442
24A471368
24A47S283
24A489067
24A471367
24A485443
24A471369
24A478233
24A90193
24B90192
24K470313
24A90197
1X482133
24A470314
1X470396
24A470159
24A470745
24A470745
S4A470744
24B470316
MEISSNER
PART No.
L3
NOTES
jg
L3Used in
Chassis TS-4D, E, F, G, H & J.
L3Used in
Chassis TS-4B 4 C.
L4Channel
Z (c 3.
Used
in C
hassis TS-4F,
G,.
H and
J.
NChannel
1. Used
In Chassis TS-4B,
C, D 4E.
Channel
4. Us
ed in Chassis TS-4F, G,
K i- J.
Channel 2.
Used in
Chassis TS-4B, C, D 4 E.
Channel
5. Used
in Chassis TS-4F, G, H & J.
Channel 3 & 4. Used
in Chassis TS-4B.
Channel
3 & 4,
Use
d in
Chassis TS-4C, D i. E. HE
Channel
6. Used in
Chassis TS-4F, G, K i J.
NChannel 5 & 6. Used In Chassis T8-4B.
Channel
5 & 6. Used in Chassis TS-4C,D & E. q
Channels 10 & 11.
Channels 8 & 9.
sr
Channel
7,Channels 2 & 3. Used in Chassis TS-4F,G,H4J. q
ChcLmcl
1 Used
In
CE~3,sc is
S 4B
C D
&. F
~Channel
4. Used
in Chassis TS-4F, G,
H i J.
Channel 2.
Used
in Chassis TS-4B, c, D i E.
Channel 5. Used
in Chassis TS-4F, G K 4 J.
Channels 3 & 4. Used in Chassis TS-4B.
Channels 344. Used
in Chassis TS-4C,D 4 E. IT
Channels 546. (TS-4F,G,tt&J channel 6 only) N
''hannel
12
&. n3
Channels
10 i
11.
t'Channels 8 & 9.
I'Channel 7.
Channels 243 Used In
Chassis 3 4F G
H & J.
ITE
Channel
1. Used
in Chassis TS-4B, C,
D &E.
Nc
Channel 2.
Used
in Chassis Ts-48,C,D & E.
M3Channel
4. Used
in Chassis TS-4F.& G.
Channel
5. Used
in Chassis TS-4H & J.
M4
Channel 344. Used
in Chassis Td-4B,C,D4£. MS
Channel 5.
Used
in Chassis TS-4F & G.
Channel 6.
Used
in Chassis TS-4H & J.
Channel 546. Used
in Chassis TS-4B,C,D4E
(TS-4F & TS-4G, Channel 6).
Channel 7.
Used
in Chassis TS-4H & J.
Channel
7. Used
in Chassis TS-4B,C,D,E,F$G
Channel 8 & 9. Used in Chassis TS-4H and J.
Channels 8 & 9. Used
in Chassis TS-4B.
Channels
d & 9. Used
in Chassis TS-4C,D, £,
F & G.
Channel 10 & 11. Used
in Chassis TS-4H 4 J
Channel
10 4 11. Used
in Chassis TS-4B, C,
D, E, F & G.
Channel 12 4 13. Used in Chassis TS-4H 4 J.
Channel
12 & 13. Used
In Chassis TS-4B.
Channel
12 4 13.
Used
In Chassis TS-4C,
D, E, F & G.
Chassis TS-4D, E, F, G, H & J. Less L30B.
Chassis TS-4B & C. Less L30B.
See Note
Wound
on 1COK2 resistor. Used
in Chassis
TS-4F, G, H and J.
Wound
on 39K2 resistor. Used
In Chassis
TS-4B, 0, D 4 E.
L35
L36
L37
L38
L3S
L40
RF Fi
l. Chk
ii n
nii
ii n
ii n
iiRF Choke
Ant . Input
Filt
er
.12
.12
.12
.12
2490064
24A90C64
24A90064
24A90064
24A471242
24A90194
i ~
^Q
Used in
Chassis TS-4B & C
only.
n ii
n ii
,i n
Not
e-O
n C
has
sis
,-o
ther
ch
assi
sH
this
co
il
is
loca
ted
in
the
scre
en
cir
cu
it
of
the
vid
eo am
. O
n al
lon
nect
ed
iri
the
gri
d c
irc
uit
of
th
e So
und
IF L
lrai
ter.
SP
EA
KE
R
ITE
MN
o.
SP
IA
SP
1B
SP
2
RA
TIN
G
FIEL
D
RES
.P
M
CO
NE
D
IA.
6"
V.
C. IM
P.
3 .22
V.
C. D
IA.
3/4
"
RE
PLA
CE
ME
NT
DA
TA
M3T
OR
OLA
PAR
T N
o.
503471219
500471322
JEN
SE
NPA
RT
No.
ST
-109
Mo
d.
P6-
W
GU
AM
PAR
T N
o.
dA
21
NO
TES
Alte
rna
te s
peak
er
SE
LE
NIU
M R
EC
TIFI
ER
ITEM No.
lil
112
RA
TIN
G
CU
RR
EN
T
110
M
A.
110
M
A.
RE
PLA
CE
ME
NT
DA
TA
MO
TOR
OLA
PAR
T N
o.
(48
B4
70
39
5 or I
1471350
)
NO
TES
MIS
CE
LL
AN
EO
US
ITEM
No.
MSA B
M4 M5
PART NAME
Switch
"Plug,
Line Cord
Ballast
Tube
Core,
Iron and Screw
n n
ii n
n n
n ii
Core,
Iron,
Copper 4
Screw
Core, Brass
and Screw
Core,
Iron 4
Screw
Socket and Leads Assy.
Escutcheon
ii
1N34 Crystal
Cabi
net
" 11 " " " 11 "Knob n " » " 11
i
ti " " 'i "
MOTOROLA
PART No.
1X489168
1X471377
2SK471323
17A470303
46A470302
46A70023
46K480256
46A471363
46A478242
46A470310
1X478281
13K485496
13B484875
48A90173
16K471438
16K478257
16K473258
16K<t71286
16K489079
16K489080
16K489081
16K489078
36K471545
36K471324
36K478251
36K478252
36K478201
36K478202
36K485449
36K485450
36B485448
36K485446
36K485447
36A485445
NOTES
Station Se
lect
or used
in Cha
ssis TS-4H 4 J.
Station
Selector used
In Chassis TS-4B,
C, D, E,F&G
L34 Sec.
used in all chassis.
L34 Prl. used
In all chassis.
Bottom of L27, used
in all chassis.
L13
used in all chassis. Ant., RF and
Osc. Coils.
Antenna, RF
and Osc. Coils
Antenna, RF,
Osc. and
IF CoilSjand top
of L27.
Picture
Tube
Channel
Indicator. Paper for Brown Cabinets. Used
in
Chassis TS-4F, G and K.
Channel
Indicator. Paper for Bl
onde
Cabinets. Used
in Chassis T3-4F, G & H.
Vide
o Detector
Blonde for VT71B (Chassis TS-4B, C, D & E) .
Brown Mahogany for VT71MB (Chassis TS-4B, C, D 4 E).
Red
Mahogany for VT71M
(Chassis TS-4B, C, D & E) .
Walnut for VT71 (Chassis TS-4B, C, D & E) .
Blonde for VT71B-A (Chassis TS-4F, G, H 4 J).
Brown Mahogany for VT71MB-A (Chassis TS-4F, G, H 4 J).
Red -Mahogany for VT71M-A
(Chassis TS-4F, G, H 4 J) .
Walnut for VT71-A
(Chassis TS-4F, G, H & J)
,,'alnut Plastic-Plain
"
"
-With Dot
Mahogany Plastic-Plain
" "
-with
Dot
Tan Plastic-Plain
"
"
-with
Dot
Walnut Plastic-For
Channel
Selector Switch(TS-4H4 J)
Tan Plastic-For Channel
Selector Switch (TS-4H 4 J)
Mahogany Plastlc-For Channel
Selector Swttch(TS-4H &J)
Walnut Plastic-For Fine Tuning (TS-4H & J)
Tan Plastic-For Fi
ne Tuning
(TS-4H & J)
Mahogany
Plastic-For
Fi
ne Tuning (TS-4H 4 J)
ALIGNMENT INSTRUCTIONSALIGNMENT INSTRUCTIONS—READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
When performing alignment with receiver out of cabinet, It Is necessary to connect a Jumperacross terminals 1 & 14 of the cathode ray tube socket to complete the heater circuit. It isrecommended that the high voltage be disabled during alignment to eliminate the shock hazard.This may be done by removing the 25L6 HI Voltage Oscillator and substituting a 75S2 10 Watt re-sistor across Pins 3 & 7 to maintain continuity In the filament string. The high voltage mayalso be disabled by disconnecting and taping the B++ lead supplying the plate and screen gridof the 25L6 Hi Voltage Oscillator. Reconnect this lead after alignment Is-1 completed.
NEVER GROUND THE RECEIVER DURING TESTING OPERATIONS OR INSTALLATION UNLESS ISOLATION TRANS- 'FORMER 13 USED. However, a grounded coaxial line may be connected tothe antenna terminal marked"G" . ;
AUDIO TAKE-OFF J. RATIO DETECTOR ALIGNMENT
DUMMYANTENNA
1000MMF
1000MMF
SIGNALGENERATORCOUPLING
High side to Pin 16AU6 (V6) . Low sideto B-.
SIGNALGENERATORFREQUENCY
4. SMC(No Mod.)
CHANNEL
Any
CONNECTVTVM
DC probe Inseries with10KS! to Point^ .Common leadto B-.DC probe Inseries with10K2 to Point
G|> .Common leadYo B-.
ADJUST
A1,A2
A3
REMARKS
Adjustffor maximum deflec-tion.
Adjust for zero reading.A positive or negativereading on either sidedesignates correct setting
IF AMPLIFIER ALIGNMENTIf difficulty is experienced in observing marker, a 1000 MFD capacitor should be connected
• across the oscilloscope input terminals.If distorted or unstable pattern is obtained during IF Alignment, It may be necessary to
stop the oscillator by connecting a 1000 MHFD capacitor from the grid (Pin 7) of 1/2 to B-.
DUMMYANTENNA
Direct
SWEEPGENERATORCOUPLING
High side to Pin1 6AG5 (V3). Lowside to B-.
SWEEPGENERATORFREQUENCY25MC
(12MC sweep!
MARKERGENERATORFREQUENCY25MC
23MC27MC
S2.1MC
22 . IMC& 27MC
CHANNEL
Any
"
CONNECTSCOPE r
Vertical amp.to Point <O .Low side to B-.
ADJUST
A4 -
A5AS
A5
A4
REMARKS
Adjust for maximumamplitude at marker.
Adjust A6 to place27MC marker 50% upthe high freq. sideof the response pat-tern. (See FjR. 11Adjust A5 until 22.1MC marker Is 5056 upthe low freq. side ofthe response pattern.(See FiR. 1)Adjust A4 for flattop or symmetricalcurve. If necessary,repeat Steps 3, 4, 5,6 & 7 to obtain de-sired pattern as perFig. 1.
1ST IF TRANSFORMER ALIGNMENTThe primary of L27 affects the low frequency side of the waveform and the secondary affects
the high frequency side. The adjustments A7 & A8 should be done simultaneously. The object Isto obtain as flat and wide a response curve as possible with as much gain as possible. The bOf,markers give a visual means of determining the band width. The contrast control should be setat 8056 rotation toward maximum gain while adjusting this transformer. It should be noted thatFigures 1 & 2 are similar, the main difference being that the sides of the pattern are steeperIn Figure 2. . ..
DUMMYANTENNA
)lrect
SWEEPGENERATORCOUPLING
High side toPin 2 12AT7(V2) . Low sideto bottom endof R17.
SWEEPGENERATORFREQUENCY25MC
J.2MC Sweep)
MARKERGENERATORFREQUENCY
22.4MC,&26.4MC'
CHANNEL
Any
CONNECTSCOPE
Vertical amp.to Point .Low side toB-.
ADJUST
A7.A8
REMARKS
Adjust A7 & A8 untilmarkers are 5056 uptheir respective sidesof the pattern perFig. 2.
OSCILLATOR ALIGNMENT
9
10
11
12
13
14
15
16
Reconnect oscillator if disabled during IF Alignment. Output of signal generator and verticalamplifier of scope should be at maximum gain. Synchronize scope to 60 '"Vj or a harmonic thereof.If receiver has f ine tuning control, pre-set this control at mid-capacity.
On Chassis TS4B, C, D & E disregard "A" adjustment points. Refer to line drawing showingantenna, RF and oscillator alignment points for these chassis.
DUMMYANTENNA
Direct
"
»
"
»"
"
"
SIGNALGENERATORCOUPLING
High side to Pin 16AG5 ( V I ) . Low sideto Junction of R14& C27.
"
-•
"11
"
"
SIGNALGENERATORFREQUENCY
81.45MC(No Mod.)
S7.45MC
93.45MC
103.45MC
109.45MC
152.S5MC
158.35MC164.35MC
170.35MC176.35MC
182.35MC188.35MC
CHANNEL
2
or
3.
4
5
6
7
8 or9
10 or11
12 or13
CONNECTSCOPE
Vertical amp.to Pin 3 12AT7(V2) . Low sideto B-.
"
«
"
"
•
•
•
ADJUSTTS-v4F, GHJJ ONLY)
A9
MO
All
5.12
A13
A14
A15
A16
REMARKS
Adjust for zero beat. ThisIs indicated by sharplydefined trace, that appearsbetween two wide tracesas coil Is tuned throughresonance.
«
11
"
"
-
•
-
ric. i
FIG. 2
FIG. 3
PAGE 6
ALIGNMENT INSTRUCTIONS (CONTJANTENNA 1 RF COIL ALIGNMENT
17A
17B
18
19
20
21
Disconnect L26 from cathode of oscillator tube (Pin 3-1.JAT7 V2) . Note that the antenna coilsare tuned f irst for the picture carrier frequency and then the RF colls are adjusted second forthe sound carrier frequency.
On chassis TS-4B, C, D & E disregard "A1 adjustment points. Refer to line drawing showingantenna, RF' ana oscillator augment points for these chassis.
DUMMYANTENNA
Direct
Direct
Direct
SWEEPGENERATORCOUPLING
High side tobottom "A" onantenna termi-nal strip. Lowside to "G"
SWEEPGENERATORFREQUENCY
57MC(10MC
sweep)
63MC( 10MCsweep)
69MC(10MCsweep)
MARKERGENERATORFREQUENCY
55 . 25MC& 5L.75MC
61 . 25MC&65.75MC
67.25MC471. 75MC
Channels 5 & 6 are aligned with AM Signal GeDirect
Direct
High side tobottom "A" onantenna termi-nal strip. Lowside to "G"
Not Used 77.25MC(400 %3056 Mod. )
81.75MC(400 ^30£ Mod. )
83.25MC(400 <\,30* Mod . )
87.75MC(400 '\,30* Mod.)
CHANNEL
2
3
4
CONNECTSCOPE
Across Rio .(Convertercathode resis-tor)
nerator Instead of sweep5
6
Across R18.(Convertercathode resis-tor)
.ADJUSTfrs-^F.GH&.J ONLY,A18,A17
A18,A17
A20,A1&
REMARKS
Adjust for maximumamplitude & symmetryand for placement ofmarkers as per Fig. 3
"
generator.ASS~,A21
A24,A23
Adjus t for maximumamplitude.
There are no antenna coll adjustments for Channels 7 through 13. The RF Colls for thesechannels are adjusted as follows, using AM Signal Generator and Oscilloscope connected asab ove .A. If Channels 3 & 6 have been set up adjust A25 for Channels 8, 10 & 12 to maximum response
at 195MC in Channel 10.B. If Channels 2, 4 & 5 have been set up adjust A25 for Channels 7, 9, 11 & 13 to maximum re-
sponse at 189MC In Channel 9.ALTEFiNATE ANTENNA 4. RF COIL ALIGNMENT USING AM SIGNAL GENERATOR AND VTVM
17A
18
20
DUMMYANTENNA
Direct
Direct
Direct
Direct
Direct
SIGNALGENERATORCOUPLING
-Ugh side to lower"A" terminal on ant.terminal strip. Lowside to "R".
SIGNALGENERATORFREQUENCY
55.25MC(No Mod.)& 59.75MC(No Mod. )
61.25MC(No Mod.)& 65.75MC(No Mod.)
67.25MC(No Mod.)& 71.75MC(No Mod. )
77.25MC(No Mod. )& 81.75MC(No Mod.)
83.25MC( N O M o d . )& 87.75MC(No Mod . )
CHANNEL
2
3
4
5
6
CONNECTVTVM
DC probe toPoint ^J> .Commonlead to B-.
ADJUST
A18
A17
A18
A17
A20
A19
A22
A21
A24
A23
REMARKS
Adjust for maximum de-flection.
For Channels 7 through 13 follow same procedure as outline in Step 21. Instead of a scopebeing used as an output Indicator a VTVM connected as above may be used.
ANT. COL R.F. COIL OSC. COILADJUSTMENTS ADJUSTMENTS ADJUSTMENTS0
11O -HJH O h
79<o
ANT.j RF. &OSC. COIL ADJUSTMENTS FOR CHASSIS TS-4B.C.D&E
PAGE?
0 n oA
F A
MP
. 1
/2
V9
A F
OU
TP
UT
. V
IOR
AT
IO
DE
T.
RF
A
MP
MIX
ER
os
c
1S
T
VID
EO
IF
2N
D
VID
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12
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16
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IEW
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IDE
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IEW
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13
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10H
010W
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OLT
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ND
RE
SIS
TA
NC
E
ME
AS
UR
EM
EN
TS
VO
LTA
GE
RE
AD
ING
SR
ESIS
TAN
CE
RE
AD
ING
S
Item
V 1
V 2
V 3
V 4
V 5
V 6
V 7
V 8
V 9
V 10
V "
V 1
2
V 13
V 14
V 15
V 16
Tub.
6AG5
12AT7
6AG5
SAGS
6AG5
6AU6
6AU6
6AL5
12SN7GT
25L6GT
12SN7GT
12SN7GT-
6SL7GT
25L6GT
1B3GT
Pin
1
125VDC
210VDC
- . 6VDC
35VDC
125VDC
- . 4VDC
95VDC
.1VDC
-.5VDC
0V.
-1VUC
16.5VDC
"-44VDC
-2 . 2VDC
0V.
DO NO"-
Pin 2
125VDC
0V.
.1VDC
110VDC
125VDC
0V.
115VDC
- . 1VDC
19VUC
54VAC
21VDC
125VDC%<
225VDC"
T
53VAC
MEASURE
Pin 3
50VAC
4VDC
39VAC
32VAC
25VAC
19 VAC
50VAC
12VAC
0V.
110VDC
ov.
;
-i ->
1.5VDC
OV.
230V DC
Pin 4
44VAC
39VAC
32VAC
25VAC
19VAC
12VAC
55VAC
7VAC
Pin 5
215VDC
39VAC
7OVDC
180VDC
200VDC
90VDC
220VDC
-.1VDC
-.7VDC Eg,
120VDC
117VDC"
-26,5'VDC
-.8VDC
230VDC
OV.
1B8VDC
-26 . 5VDC
270VDC
OV.
Pin 6
215VDC
220VDC
110VDC
215VDC
200VDC
165VDC
220VDC
OV.
OV.
OV.
120VDC
2.8VDC
OV.
OV.
•
Pin 7
125VDC
-3.2VDC§
.1VDC
110VDC
125VDC
OV.
115VDC
- . 1VDC
20VAC
30 VAC
34VAC
20VAC
53VAC
80VAC
Pin 8
- OV.
. _ . _ _
7VAC
10VDC
49VAC
34VAC
48VAC
3.2VDC
Pin 9
_
44VAC
_ . _ _ _ _ _ _ _ _ .
PINS 1
2
3
4
5
6
7
8
9
10
11 12
13
14
60VDC
7JP4
0V.
210VDC
0V.
tT
t t
t t
7VAC
Item
V !
V 2
V 3
V 4
V 5
V 6 V 7
V 8
V »
V 10
v n
V'2
V13
V14
V'5
V 16
Tub*
6AG5
12AT7
6AG5
6AG5
6AG5
6AU6
6AU6
6AL5
12SN7GT
25L6GT
12SN7GT
12SN7GT
6SL7GT
25L6GT
1B3GT PINS 1
7JP4 |02
Pin
1
16K2**
12002*
3 Meg.
2.5 Meg.
10002**
1 Met.
470K2**
6.8K2
4.7 Meg.
INT.
2 Meg.
24K2
10K2
10 Me,;.
INF.
INF.
246CK2*
700KS2*
Pin 2
10002**
33K2
332
INF.
10002»*
oa 822**
6.8K2
440K2*
308
1 Meg.**
17K2*
sona*
INF.
272
INF.
7,
402
INF .
Pin 3
262
2.7K2
22S2
18B
14ffl
102
27S! sa 02
2302**
OS
2102 OS!
3002"
INF. 5 INF.
I
Pin 4
232
222
182
142
102
52 302
22
8,3 Meg.
3.3 Mee.
02**
10KS2*«
150K2*
10 Meg.
3352*
INF.
6
7NF.
IF-'F.
Pin 5
12002*
222
INF . *
6K2*
12002*
12K2*
12002*
1 Meg.
7.2'
Meg.'
2.5 Meei
470K2
7K2*
150K2*
INF.
150K2
INF. 6 I:;F.
i
Pin 6
12002*
12002*
INF.*
12002*
12002*
4.8K2*
12002*
470K2
02 INF.
02»*
3.3K2
02 02 INF.
,
9
10
NF . INF
Pin 7
10002**
lOKffi
332
INF.
10002**
02
822**
1 Meg.
112
402
22
112
272
362
INF.
11 INF.
I
Pin 8
- .32
- _ _ _ _ 22
3302
2.52
202
252
1002
INF.
12
13NF . INF
Pin?
- 23a
- _ _ _ _ - - - _ _ _TOP CAP
12002*
14 22
TOO NOT MEASURE. CAN NOT MAKE ACCURATE MEASI1REFENT DUE TO HIGH IMPEDANCE OF CIRCUIT.
§TAK£N WITH VACUUM TU
BE VO
LTME
TER.
•MEASURED FROM JUNCTION OF M2 AND PIN 4 OF MS.
••MEASURED FROM POSITIVE TERMINAL 01 C-3B.
1 - DC Voltage measurements are at 20,000 ohms
per volt; AC Voltages measured at 1000 ofims.
2 - Socket connections are shown as bottom views.
3 - Measured values are from socket pin to common
negative unless otherwise stated.
4 - Line voltage maintained at 117 volts for
voltage readings.
5 - Front panels controls set at maximum.
6 - where readings roay vary according to the
setting of the service controls, both
minimum and maximum readings are given.
g m
00
5
HD
R.H
OLD
50
0M
MF
A
PH
OTO
FAC
T S
TA
ND
AR
D
NO
TA
TIO
N
SC
HE
MA
TIC
©H
ow
ard
W.
Sam
s &
Co.
, In
c. 1
949
DISASSEMBLY INSTRUCTIONS
1. Remove 4 screws holding back panel and power Interlock and remove.
2. Remove push on type knobs and 2 felt washers on front of receiver.
3. Unplug speaker leads.
4. Remove picture tube socket.
5. Remove 4 chassis bolts from bottom of cabinet.
5. Slide chassis out rear of cab.
7. Remove-4 nuts and lock washers on speaker and remove.
POSITIONING OF FEEDBACK SPRING ON H.V. RECTIFIER
Feedback to the grid of H. V. Oscillator tube Is obtained by a capacltlve coupling device
. consisting of a coll mounted around the envelope of the High Voltage Rectifier tube. The posi-
tion of this spring Is very critical and misplacement will result In very low or no high volt-
age.
For the old construction tube (8016) the lower edge of the spring should be 13/16" ± 1/32"
from the top of the tube base. On the new type construction (1B3GT), the bottom edge of the
spring should be 3/4" t 1/32" from the top of the tube base.
300^
FOCUS HORIZ.CENT.
VERT. HORIZ. VERT. HORIZ. VERTCENT. SIZE SIZE HOLD HOLD
BRIGHTNESS
CABINET-REAR VIEW
PAGE 19