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MaintenancemyReflow

Version 38.2.0.000

VITRONICS SOLTEC BV

Visit address Innovatiepark 12 - 4906 AA Oosterhout - the NetherlandsMail address P.O. Box 143 - 4900 AC Oosterhout - the NetherlandsTelephone +31-162-483000Fax +31-162-483269

Rights

COPYRIGHT 2009 VITRONICS SOLTEC BV

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of Vitronics Soltec BV.This publication remains the property of Vitronics Soltec BV and may not be passed, loaned or given to any third party.

Vitronics Soltec BV reserves the right to make changes in design and specifications without notice.

EUROPE

VITRONICS SOLTEC BV VITRONICS SOLTEC GmbH

Innovatiepark 12 Udo-Lermann Str.10

4906 AA Oosterhout 97828 Marktheidenfeld

the Netherlands Germany

Tel. +31-162-483000 Tel. +49-9391-98820

Fax +31-162-483269 Fax +49-9391-988228

AMERICAS

VITRONICS SOLTEC Inc.

2 Marin Way

Stratham, New Hamphire 03885

USA

Tel. +1-603-772-7778

Fax +1-603-772-7776

ASIA PACIFIC

VITRONICS SOLTEC SHANGHAI VITRONICS SOLTEC (SUZHOU) Co. Ltd

Sales Office Manufacturing Plant

858 Zhujiang Lu 858 Zhujiang Lu

Building 2 Building 2

Suzhou New District, China 215129 Suzhou New District, China 215129

Tel. +86-21-5033-7855 Tel. +86-512-6841-3378

Fax +86-21-6360-9449 Fax +86-512-6841-3161

VITRONICS SOLTEC PTE LTD. VITRONICS SOLTEC KOREA

132 Joo Seng Road A-1001, Poonglim Iwant Bldg.

#03-01 Uniplas Building 255-1 Seohyun Dong,

Singapore 368358 Bundang Gu, Seongnam 463-862, Korea

Tel. +65-6484-3010 Tel. +82-31-783-7020

Fax +65-6484-1910 Fax +82-31-783-7021

VITRONICS SOLTEC MALAYSIA

8-2-5 Sunny Point Complex

Jalan Sultan Azlan Shah, Batu Uban,

11700 Penang, MalaysiaTel. +60-4-658-4227

Fax +60-4-655-4227

ii

Preface

During the composition of this manual much attention is given to avoid errors

and mistakes. Also we aimed to give the contents a clear structure.

If during the use of this manual errors or incomplete descriptions are found, or

the reader considers that improvements are necessary to overcome any in-

accuracies, please inform us. We appreciate any comments which will help us to

improve this documentation.

For corrections or clarifications please contact:

1. By mail:

VITRONICS SOLTEC BV

HEAD OFFICE

TECHNICAL PUBLICATIONS

P.O. BOX 143

4900 AC OOSTERHOUT

THE NETHERLANDS

TEL NR. (31) - 162483000

FAX.NR. (31) - 162483285

OR

2. By e-mail:

[email protected]

Maintenance myReflow iii

Table of Contents

Preface iii

Table of Contents v

1 Maintenance 1-11.1 General . . . . . . . . . . . . . . . . . . . 1-1

1.2 Required materials to work safe . . . . . . . . . . . 1-2

1.2.1 Ordering details . . . . . . . . . . . . . . 1-2

1.3 Maintenance Sections . . . . . . . . . . . . . . 1-3

1.3.1 Sensors . . . . . . . . . . . . . . . . . 1-3

1.3.2 Heating Zones Bottom & Top . . . . . . . . . . 1-3

1.3.3 Change width conveyor & width PCB support . . . . . 1-4

1.3.4 Clean nitrogen curtain . . . . . . . . . . . . 1-4

1.3.5 Clean conveyor and PCB support . . . . . . . . . 1-4

1.3.6 Width adjustment and drive shafts . . . . . . . . . 1-5

1.3.7 Grease Chain . . . . . . . . . . . . . . . 1-6

1.3.8 Filters switchbox . . . . . . . . . . . . . . 1-6

1.3.9 Cooling Systems . . . . . . . . . . . . . . 1-7

1.3.10 Cooling Systems / Chiller / GRS . . . . . . . . . 1-9

1.3.11 Cleaning Heat exchanger . . . . . . . . . . . 1-10

1.3.12 Chiller . . . . . . . . . . . . . . . . . 1-10

1.3.13 GRS . . . . . . . . . . . . . . . . . . 1-11

1.3.14 Factory Water cooling requirements . . . . . . . . 1-13

1.3.15 Cleaning the coolzone(s). . . . . . . . . . . . 1-14

1.3.16 Filterbox . . . . . . . . . . . . . . . . 1-15

1.3.17 Check filter Oxygen analyzer . . . . . . . . . . 1-16

1.3.18 Complete cleaning of machine and inspection . . . . . 1-16

1.4 Maintenance sheets . . . . . . . . . . . . . . . 1-16

2 MSDS 2-12.1 Material Safety Data Sheets . . . . . . . . . . . . 2-1

Index vii

Maintenance myReflow v

ICON DESCRIPTION ICON DESCRIPTION

Only Qualified personnel is allowed to work on the equipment.Never eat, drink or smoke while working on the machine.Wash thoroughly before eating, drinking or smoking.

High voltages are present on various parts of the sys-tem.

Before working on the electrical circuit, turn main power off and block the mainswitch with a padlock.

Always wear heat resistant gloves and protective clothing when working on the machine.

If possible allow the machine to cool down before starting working on the machine.

When burned, immerse in cold water immediately. When the burn is severe, consult a physician as soon as possible.

Always wear heat resistant gloves and protective clothing when working on the machine.

If possible allow the machine to cool down before starting working on the machine

When burned, immerse in cold water immediately. When the burn is severe, consult a physician as soon as possible.

No smoking or open fire near the machine.

Be sure a fire-extinguisher is in the surroundings of the machine.

No smoking or open fire near the machine.

Be sure a fire-extinguisher is in the surroundings of the machine.

All moving parts of the system, including pulleys, belts, chains, coolingfans, sprocketwheels, vacuum-doors and cylinders presents a potential danger.

Be careful with covers and doors. Always pay atten-tion to opening and closing.

The vapours in the board preparation module are chemical. When the board is heated, a noxious vapour will be liberated. This vapour must be extracted. Also the dust on the surface of the solder-pot is dangerous when inhaled.

Avoid inhaling this vapours / dust by using mouth protection.

When working on the machine, always protect your eyes with safety glasses.

Nitrogen

N2

Follow the safety precautions and procedures described in the Material Safety Data Sheet of the Nitrogen supplier.

UPSUninterruptible Power Source

When mainswitch is switched OFF for a longer period, switch the UPS to OFF.

Signal light RED- E-stop Active

Signal light GREEN - Steady = Machine Run, - Flashing slow = Machine not at setpoint, machine stop

Signal light ORANGE- Steady = Overload (outfeed full), Machine will block, - Flashing slow = Alarm- Flashing fast = Critical alarm. Machine will block

LASER RADIATIONDo not stare into beam. Class 2 Laser product.

Only applicable for Soldering machines equipped with laser measurement systems.

If these rules are not observed it can cause personal injury and/or damage to the machine

SAFETY RULESGENERAL INFORMATION

VERSION 2009 June

Maintenance 1

1.1 GENERAL

The table at the end of this chapter gives a description of the maintenance operations which are

necessary to keep the machine in perfect condition. Also the advised production interval time

between maintenance cycles is given.

In chapter Exploded Views detailed information is given of the machine. The drawings can be

used for the maintenance personnel when working on the machine.

The recommended intervals between maintenance are to some extend indicative. They may vary

depending on the used solderpaste and load of the machine. Maintenance is the responsibility of

the customer, so modifications of the recommended interval-times should be made based on

experience.

We advise to use an appropriate cleaning detergent for cleaning, e.g. products of the DEK®

cleaners range, such as:

A. DEK® Plastic/Metal/Glass Cleaner for general purposes.

B. DEK® ESD Mat Cleaner for ESD protected covers.

C. DEK® Reflow Oven Cleaner for carbonised flux residues.

Always remove detergent residues with clean water. Prevent water to come in contact with the heaters.

Dry thoroughly and grease/lubricate with the advised grease/oil.

Use protecting clothes, safety glasses and gloves.

Its not allowed to use cleaning solvents when the machine is hot.

Maintenance myReflow.com CHAPTER 1 1

MAINTENANCE

1.2 REQUIRED MATERIALS TO WORK SAFE

We have made a kit including the required materials to work safe with your soldering equipment.

1.2.1 ORDERING DETAILS

This kit UG0200 can be ordered through your Vitronics Soltec office or local representative.

The kit includes:

The part numbers can also be ordered as separate items.

PART NUMBER QUANTITY DESCRIPTION

42284 5 Hand gloves heat resistant size 10

42285 5 Eye protection glass (ski type)

42286 30 Mouth protection mask 3M9928

42287 20 Hand gloves rubber size 10

42288 2 Apron size 80 x 100 cm

2 CHAPTER 1

1.3 - MAINTENANCE SECTIONS

1.3 MAINTENANCE SECTIONS

Some of the pictures showed in this chapter are made without the use of the correct protective

tools, like gloves, for reason to give a better detailed picture.

1.3.1 SENSORS

Advised maintenance after 200 hours.

Clean all the sensors on the conveyor with a cloth and some detergent.

FIGURE 1.1 CLEANING SENSORS

1.3.2 HEATING ZONES BOTTOM & TOP

FIGURE 1.2 CLEANING PLATES


Clean holeplates with Reflow Oven Cleaner and cloth. Check holes in holeplates are open.

Do not spray oven cleaner directly on holeplates. Avoid leaking cleaner on insulation materials

inside heaterbox. Apply cleaner on cloth.


MAINTENANCE

1.3.3 CHANGE WIDTH CONVEYOR & WIDTH PCB SUPPORT

When the conveyor & PCB support(s) are unchanged in width for a long period the threaded

rods can get stucked (especially in the peak and cooling zones).

By changing once a week width from min to max this can be avoided.

1.3.4 CLEAN NITROGEN CURTAIN

Only for nitrogen machines.


FIGURE 1.3 CLEANING NITROGEN CURTAIN

1.3.5 CLEAN CONVEYOR AND PCB SUPPORT


1. Open the tunnel

2. Suck the crystallized solderpaste in the vacuum-cleaner.

3. Clean infeedguides, chainprofiles and chaincovers of the PCB support with a cloth and

detergent.

NITROGEN CURTAIN

1. Change conveyor width of machine to

smallest position

2. Open hood for easy access.

3. Clean curtain with Reflow Oven

Cleaner and cloth

4 CHAPTER 1


1.3.6 WIDTH ADJUSTMENT AND DRIVE SHAFTS


FIGURE 1.4 WIDTH ADJUSTMENT

1. Clean the carrying shafts and driving shafts of the conveyor and PCB-support system with a

cloth, brush and grease, using anti-seize (partnumber 42381).

The driving shafts on the in,- and outfeed side can be greased with Bel-Ray No-Tox HD

Grease (partnumber 42385 (500 gr. can)). Greasing of the carrying shaft on the in,- and

outfeed sides not needed.

2. Grease the chain of the width adjustment with Oil Kluber synth H2 C2-260 - partnumber

46036. Apply the oil with a brush on the chain.

Advised maintenance yearly.

FIGURE 1.5 WIDTH ADJUSTMENT

1. Remove stainless steel covers on the front side.

2. Grease the wheel gear of the width adjustment with Bel-Ray No-Tox HD Grease (partnumber 42385 (500 gr. can)).

3. Put the covers back.

Do not spray detergent on parts of the width adjustment. Detergent will degrease the chains and bearings and they can be damaged.

WHEELGEAR

Front

The number of wheel gears dependson the length of the machine.


MAINTENANCE

1.3.7 GREASE CHAIN

1.3.7.1 AUTOMATIC LUBRICATION SYSTEM

The machine is equipped with an automatic lubrication system.

FIGURE 1.6 GREASE SYSTEM ON BACKSIDE OF MACHINE

Advised check after 200 hours.

1. Remove cover on backside of machine.

2. Check oil level in oil reservoir. When oil level < 2 cm fill up the oil reservoir.

Oil Kluber synth H2 C2-260 - partnumber 46036.

3. Check brushes. If they are worn out “to much” or clogged with dust, replace it with a new

one (partnumber 430526)

4. Check all oil hoses and connections.

5. Check lubrication system applies oil on chain. When the chain is to dry or too wet, change

lubrication interval. See User manual.

1.3.8 FILTERS SWITCHBOX


FIGURE 1.7 FILTERS SWITCHBOX

Oil for lubrication system

The filters are located on both sites from the

switchbox. Behind the switchbox covers.

Remove the grates (Figure 1.7) and clean the filters

with a vacuum-cleaner or compressed air.

6 CHAPTER 1


1.3.9 COOLING SYSTEMS

FIGURE 1.8 WATER/AIR COOL UNIT

cool 1

cool 2

cool 3

6

1 2

5

3

4

7

B72

B71

Y71

Y72

Y73

M74

M75 M76

Circulation pumpBypass valve2/2 valve

Level sensorFlow indicatorHeat exchanger

123

456

Pressure gauge7


MAINTENANCE

1.3.9.1 INSTRUCTIONS

FIGURE 1.9 FILLING THE VESSEL

1. Refill unit with coolant when alarm is displayed. Recommended maximum level is horizontal

plate in vessel. Coolant partnumber 43543.

2. The bypass valve is adjustable and is factory set. When the 3 valves Y71, Y72 and Y73 are

open, the pressure on the system should be at 1 bar (see manometer pos 7 in Figure 1.8).

When setpoints of the 3 cooling zones are below measured value, then the 3 valves will all

be opened.

Never completely close the bypass valve.

This will block the primary flow, and as result this can damage the pump.

It will also block the cold water through the GRS (optional unit).

When the GRS filterbox is integrated in the primary flow, always make sure that the circuit is

closed to prevent damaging the pump.

3. Flow detection sensor (B71) normally does not require re-adjustment.

Factory adjustment:

1. Coolunit must be at ambient temperature. Only one valve ((Y71,72,73) will be opened.2. The bypass valve is already adjusted (see previous steps)

Under the center screw on the sensor (B71) an adjustment screw is located. Turn counter clockwise until leds go out.

3. Turn clockwise until two green leds are on.

Cooling liquid

Horizontal plate

8 CHAPTER 1


1.3.10 COOLING SYSTEMS / CHILLER / GRS

Optional the machine can be extended with a GRS (Gas Recirculation System), Chiller and/or

Factory water cooling.

FIGURE 1.10 COOL UNIT / CHILLER / GRS

1.3.10.1 INSTRUCTIONS

Same adjustment procedures as in 1.3.10.1 on page 1–9.

cool 1

cool 2

cool 3

61 2

5

3

4

GRS

inle

t

outlet

Chill

erFa

ctory

Wat

er

7optional

B72

B71

Y71

Y72

Y73

M74


MAINTENANCE

1.3.11 CLEANING HEAT EXCHANGER


FIGURE 1.11 HEAT EXCHANGER

1. Switch off cooler.

2. Slide out cooler unit.

3. Clean with vacuum-cleaner the heat exchanger.

Be careful with the laminated plates of the cooler. They easily can get damaged.

1.3.12 CHILLER

Advised check after 200 hours

1. Check coolant level of chiller when pump is running.

2. Check coolant pressure chiller (1.5 - 2 bar) when pump is running.

When chillerpump isn’t running, there’s no pressure on the system.

FIGURE 1.12 CHILLER

More info of the chiller can be found in the suppliers manual.

Coolant level

Coolant pressuremust be 1.5 - 2 bar

When pump is running

10 CHAPTER 1


1.3.13 GRS


Before proceeding the machine must be switch off and cooled down (approx. 100 °C).

FIGURE 1.13 CLEANING THE GRS UNIT

11 12

1

5-7-9 6-8

2

3 4

step

FLOW DIRECTION


MAINTENANCE

FIGURE 1.14 EXPLODED VIEW GRS

FIGURE 1.15 ASSEMBLY ORDER GRS UNIT

1. Remove coverplate GRS.

2. Unscrew 2 bolts.

3. Release 6 Quick couplings.

4. Slide out Box filter unit.

5. Slide out Heat Exchanger 3.

6. Slide out Metal Filter 2.


8. Slide out Metal Filter 1.

filter 43039

seal ring 428513

sealing 314913

Box

conn

ectio

n

Hea

t Ex

chan

ger

1

Met

al F

ilter

1

Hea

t Ex

chan

ger

2

Met

al F

ilter

2

Hea

t Ex

chan

ger

3

Box

filte

r

Blower

assembly orderre-assembly order

step 10 9 8 7 6 5 4

12 CHAPTER 1



10. Slide out Box connection

11. Clean inside of GRS box, check sealing (1x partnumber 314913) and sealrings.(12x partnumber 428513).

12. Check filter and replace if necessary. Partnumber filter 43039.

13. Clean heat exchangers and filters (step 5-9) in bath with cold cleaning detergent or with an ultrasonic cleaner.

The heat exchanger can get damaged if the unit is cleaned in cleaning fluid with a higher tempera-

ture than the heat exchanger itself.

14. Grease Quick couplings with Molykote 111 partnumber 32276 for better connect (disconnect).

15. Replace all items and close cover GRS system.

16. Clean once a year all pipes/hoses of GRS.

1.3.14 FACTORY WATER COOLING REQUIREMENTS

DESCRIPTION DIMENSIONS

Maximum water pressure supply <800 kPa/8 bar

Pressure differential ΔP at 17 ltr/ min 5.83 kPa/0.0583 bar

Pressure differential ΔP at 33 ltr/ min 20.35 kPa/0.2035 bar

Minimal water supply (process zones only)Including GRS

17 ltr/min at 7°C33 ltr/min at 7°C

Connection 1“ G inside thread


MAINTENANCE

1.3.15 CLEANING THE COOLZONE(S)


1. Let machine cool down to ambient temperature.

2. Disconnect the quick watercouplings and the 10 hexagon bolts.

3. Slide out coolunit and clean it in a cold bath of detergent with a brush or in ultrasonic

cleaner.

The heat exchanger can get damaged if the unit is cleaned in cleaning fluid with a higher tempera-

ture than the heat exchanger itself.

Disconnect the heating element before cleaning the coolunit with heating in cleaning fluid.

FIGURE 1.16 COOLUNIT

4. Grease quick couplings with Molykote 111 partnumber 32276 for better connect

(disconnect).

5. Replace unit and connect the quick couplings.

The heat exchanger can get damaged if the quick couplings are not connected when the machine

is running.

Coolunit

Coolunit with Heating

Heating

14 CHAPTER 1


1.3.16 FILTERBOX

We advise to clean the filterbox regular, but at least after 250 production hours.

FIGURE 1.17 FILTERBOX

1. Open the cover of the filter box at the infeedside of the machine.

2. Take out the filters. First fine filter, second the rough filter. Check the amount of pollution of

the filters, and if necessary replace them.

Lifetime fine filter about 500 hours, rough filter about 250 hours.

3. Clean box inside.

4. Place filters in filterhousing. First rough filter, second the fine filter.

The fine filter has a gauze on one side of the filter.

FIGURE 1.18 FLOW DIRECTION ON FILTERS

The pollution of the filters will be higher for machines without the GRS system.

Difficult opening / fast closing of the filterbox cover is caused by the under pressure in the filter-

box.

• Maintenance for Filterbox with GRS system every 1000 hours

• Maintenance for Filterbox without GRS system every 200 hours

fine filter

rough filter


MAINTENANCE

1.3.17 CHECK FILTER OXYGEN ANALYZER

When the filter is polluted the reaction-time of the oxygen analyzer will decrease.

Also to avoid damage to the oxygen analyzer its is recommended to replace the filter once every two months.

Partnumber filter 43297.

FIGURE 1.19 OXYGEN ANALYZER

1. Open the inspection glass and screw out the used filter cartridge.

2. Place new filter into the housing.

3. Carefully screw the inspection glass in the housing (hand-tight).

More info of the oxygen analyzer can be found in the suppliers manual.

1.3.18 COMPLETE CLEANING OF MACHINE AND INSPECTION


1. Check the connections of the heater elements.

2. The painted surfaces must be cleaned with a mild detergent or glass-cleaner. Stainless steel

surfaces must be cleaned with solvent (if the temperature is low).

3. If an inflammable cleaner is used, be sure that the hole machine is cold.

1.4 MAINTENANCE SHEETS

On the following pages this sheet is located.

Filterhousing

16 CHAPTER 1

17D

ET

ER

GE

NT

Bat

h

GR

EA

SE

- IT

EM N

UM

BER

CO

OL

AN

T-

ITEM

NU

MBE

R

VA

CU

UM

CLE

AN

ER o

r

CO

MPR

ESSE

D A

IR

CLO

TH

or BR

USH

C

C

C

V C

42381 C/B

42385 C/B

42385 B

46036 B

46036

V/C

43543

43543

X 32276 V/C C/B

Maintenance sheet myReflow 7038

HAO-170609

WEEKNUMBER . . . .

DESCRIPTION

TIM

ESPA

N (

MIN

UT

ES)

INT

ERV

AL

(PR

OD

UC

TIO

N H

OU

RS)

DE

TE

RG

EN

T t

ype

A

DE

TE

RG

EN

T t

ype

B

DE

TE

RG

EN

T t

ype

C

1.3.1 Sensors 5 200 X

1.3.2 Heating Zones Bottom & Top 15 200 X

1.3.3 Change width conveyor & width PCB support 5 50

1.3.4 Clean nitrogen curtain 15 200 X

1.3.5 Clean conveyor and PCB support 30 1200 X

1.3.6 Width adjustment and drive shafts (inside the machine) 15 1200

1.3.6 Width adjustment and drive shafts (In and outfeedside of machine) 5 1200

1.3.6 Width adjustment and drive shafts (Wheel gear) 10 2500

1.3.6 Width adjustment and drive shafts (Chain width adjustment) 10 1200

1.3.7 Grease Chain - Automatically - Check system 2 200

1.3.8 Filters switchbox 5 200

1.3.9 Cooling Systems (Water/Air Cooling) 10 200

1.3.10 Cooling Systems / Chiller / GRS 10 1200

1.3.11 Cleaning Heat exchanger 10 1200

1.3.12 Chiller 5 200

1.3.13 GRS 30 200

18

X 32276 C/B

V/C

V/C

V/C C

DE

TE

RG

EN

T B

ath

GR

EA

SE

- IT

EM N

UM

BER

CO

OL

AN

T-

ITEM

NU

MBE

R

VA

CU

UM

CLE

AN

ER o

r

CO

MPR

ESSE

D A

IR

CLO

TH

or BR

USH

* = Only to use on ESD coated covers!

1.3.15 Cleaning the coolzone(s) 30 200

1.3.16 Filterbox without GRS system 10 200

1.3.16 Filterbox with GRS system 10 1000

1.3.17 Check filter Oxygen analyzer 5 400

1.3.18 Complete cleaning of machine and inspection 60 1200 X X * X

DESCRIPTION

TIM

ESPA

N (

MIN

UT

ES)

INT

ERV

AL

(PR

OD

UC

TIO

N H

OU

RS)

DE

TE

RG

EN

T t

ype

A

DE

TE

RG

EN

T t

ype

B

DE

TE

RG

EN

T t

ype

C

VERSION 2009 June

MSDS 2

2.1 MATERIAL SAFETY DATA SHEETS

On the following pages the MSDS sheets of the following partnumbers are included:

TABLE 2.1 MATERIAL SAFETY DATA SHEETS

PARTNUMBER DESCRIPTION

32276 Molykote 111

42381 Grease anti-seize

42385 Grease Bel-Ray No-Tox HD 2

43543 Cooling Liquid Type D WLB Vlamings 20 liter

46036 Oil Kluber synth H2 C2-260

MSDS myReflow.com CHAPTER 2 1

MSDS

2 CHAPTER 2

Index

C

Chain . . . . . . 1-6

Chiller . . . . . .1-10

Cleaning Heat exchanger .

1-10

Conveyor . . . . . 1-4

Coolzone . . . . .1-14

F

Filterbox . . . . .1-15

G

General . . . . . 1-1

GRS . . . . . .1-11

H

Heating Zones . . . 1-3

M

Maintenance . . . . 1-1

Maintenance sheet . .1-17

MSDS . . . . . . 2-1

N

Nitrogen curtain . . . 1-4

Maintenance myReflow

O

Oxygen analyzer . . 1-16

P

PCB support . . . 1-4

R

Rights . . . . . . 1-ii

S

Sensors . . . . . 1-3

Switchbox . . . . 1-6

W

Water/Air Cooling . 1-7, 1-9

Width adjustment . . 1-5

Width PCB support . 1-4

vii

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