Ricoh FAX5600L Service-Handbuch

PREPARED BY: H.Yokoyama

CHECKED BY: S.Hamano FROM: 2nd T.S. Section

CLASSIFICATION:

Action Required Revision of service manual

Troubleshooting Information only

Retrofit Information Other

MODEL:

FAX5600L

Following pages have been corrected.

Page: 2-18, 19

6-1~28

A floppy disk with corrected pages except page 2-18 and 19, is enclosed.

Technical Bulletin No.CGO-001

SUBJECT: Service Manual Correction DATE:

Sep. 14, 1994

6. TROUBLESHOOTING

6.1. COPY QUALITY TROUBLESHOOTING

If there is a copy quality problem that cannot be solved easily, try using the

following troubleshooting flow chart, while referring to the point-to-point dia-

gram. The flow chart may not be exhaustive, but it may help you to find the

problem.

Symptom: Blank copies

Check Action if Yes Action if No

1. Make a printer test (see

section 4-1-13). Is it OK? There may be a scanner

problem; go to step 15. Go to step 2.

2. Is the master installed cor-

rectly? Go to step 3. Install it properly.

3. Does the master rotate

correctly during the copy

cycle?

Go to step 4. Correct any problems with

the mechanism.

4. Is the master grounded

properly? Go to step 5. Check the grounding wire,

terminals and plates. Clean

or replace if necessary.

5. Are any of the laser opti-

cal components broken,

blocked, or misaligned?

Correct the problem. Go to step 6.

6. Are the transfer corona

unit and wire correctly in-

stalled?

Check the connections

between the corona wire

and the FCU. Go to step 7.

Correct the problem.

7. Does the FCU output the

power and corona trigger

signal to the power pack?

Clean the transfer corona

unit. Go to step 8. Change the FCU.

8. Does the problem go

away if you change the

power pack?

Finished. Go to step 9.

9. Does the development

bias terminal reach the

correct voltage

(about -530 Vdc)?

Go to step 12. Go to step 10. Do not adjust

the variable resistors on the

power pack.

10. Does the FCU output the

power and bias trigger

signal to the power pack?

Clean the area around the

bias terminal. Go to step 11. Change the FCU.

11. Does the problem go

away if you change the

power pack?

Finished. Clean the development

roller. Go to step 12.

12. Does the development

roller attract toner? Check all LDDR- FCU -

interlock switch

connections. Go to step 13.

Replace the roller.

Troubleshooting

TROUBLESHOOTING 1st August, 1994

COPY QUALITY TROUBLESHOOTING

6-1

Symptom: Blank copies

Check Action if Yes Action if No

13. Is the laser diode unit

screwed in properly? Go to step 14. Install it properly.

14. Do the interlock switches

close when the cover is

closed, and do they pass

power to the LDDR?

Change the LD unit, FCU,

master unit, or varistor. Change them.

15. Check the FCU - SBU

connection. Is there a

signal from the SBU

(AVIDEO)?

Go to step 16. Light the xenon lamp. Align

the SBU (see section 5-2-9);

replace the FCU or SBU if

impossible.

16. Does the problem only

occur when printing from

memory?

Check the connection to the

memory card. Change the

memory card, FCU, or MBU.

Go to step 17.

17. If the problem only occurs during communication, check the FCU - NCU - line

connections. Check for severe line problems. If the problem cannot be found, replace

the NCU or FCU.

Symptom: Black copies

Check Action if Yes Action if No

1. Make a printer test (see

section 4-1-13). Is it OK? There may be a scanner

problem; go to step 10. Go to step 2.

2. Are the charge corona

unit and wire correctly

installed?

Check the connections

between the corona wire

and the FCU. Go to step 3.

Correct the problem.

3. Does the FCU output the

power and corona trigger

signal to the power pack?

Clean the charge corona

unit. Go to step 4. Change the FCU.

4. Does the problem go

away if you change the

power pack?

Finished. Go to step 5.

5. Is the varistor shorted? Change the varistor. Go to step 6.

6. Is the master grounded

properly? Go to step 7. Check the grounding wire,

terminal and plate. Clean or

replace if necessary.

7. Does the development

bias terminal reach the

correct voltage

(about -530 Vdc)?

Go to step 10. Go to step 8. Do not adjust

the variable resistors on the

power pack.

8. Does the FCU output the

power and bias trigger

signal to the power pack?

Clean the area around the

bias terminal. Go to step 9. Change the FCU.

9. Does the problem go

away if you change the

power pack?

The laser beam may always

be on. Change the FCU or

LD unit.

Clean the development

roller. Go to step 10.

10. Check the connections

from the FCU to the

xenon lamp. Does the

lamp work?

Go to step 12. Go to step 11.

1st August, 1994 TROUBLESHOOTING

COPY QUALITY TROUBLESHOOTING

6-2

Symptom: Black copies

Check Action if Yes Action if No

11. Does the FCU output the

power and drive signals

to the lamp driver?

Change the xenon lamp or

the drive board. Change the FCU.

12. Check the FCU - SBU

connection. Is there a

signal from the SBU

(AVIDEO)?

Go to step 13. Light the xenon lamp. Align

the SBU (see section 5-2-9);

replace the FCU or SBU if

impossible.

13. Does the problem only

occur when printing from

memory?

Check the connection to the

memory card. Change the

memory card, FCU, or MBU.

Go to step 14.

14. If the problem only occurs during communication, check the FCU - NCU - line

connections. Check for severe line problems. If the problem cannot be found, replace

the NCU or FCU.

Symptom: Faint copy

Check Action if Yes Action if No

1. Make a printer test (see

section 4-1-13). Is it OK? There may be a scanner

problem; go to step 7. Go to step 2.

2. Try the following steps (a to f) to solve the problem. If they fail, check the connections

through the machine between the FCU, toner near-end sensor, and toner supply motor.

Then go to step 3.

a) Replace the master.

b) If the Add Toner indicator is lit, add toner.

c) Clean or replace the corona wires.

d) Clean the toner metering blade (soft cloth and alcohol).

e) If the copy paper is damp, replace it.

f) If the toner contains dirt or paper particles, replace it.

3. Has the toner run out

even though the Add

Toner indicator is not lit?

Check the sensor actuator

mechanism. Change the

sensor if necessary.

Go to step 4.

4. Does the toner supply

motor turn just after the

main power is switched

on?

Go to step 5. Change the toner supply

motor or the FCU.

5. Work through steps 4 to 12 of "Blank copies".

6. Change the varistor, FCU, or LD unit .

7. Clean the exposure glass and the white plate in the scanner.

Symptom: Faint copy at leading or trailing edge

Check Action if Yes Action if No

The paper in the cassette may be curled at the leading edge

The paper in the cassette may be damp.

The paper may be too thick or too thin.

Instruct the user how to store paper, and instruct them to use recommended types and

weights of copy paper.

Troubleshooting

TROUBLESHOOTING 1st August, 1994

COPY QUALITY TROUBLESHOOTING

6-3

Symptom: Dirty background all over the copy

Check Action if Yes Action if No

1. Make a printer test (see

section 4-1-13). Is it OK? There may be a scanner

problem; go to step 13. Go to step 2.

2. Try the following steps (a to f) to solve the problem. If they fail, go to step 3.

a) Clean the quenching lamp and cleaning blade.

b) Tighten the toner metering blade securing screws (see section 5-6-2).

c) If the toner contains dust or paper particles, change the CTM.

d) Clean the area around the bias terminal of the development unit.

e) If the pattern is constant down the page, clean the laser optics with a blower brush, or

clean or replace the corona wires.

3. Is the master grounded

properly? Go to step 4. Check the grounding wire,

terminals and plates. Clean

or replace if necessary.

4. Is the varistor shorted? Change the varistor. Go to step 5.

5. Does the development

bias terminal give a

constant correct voltage

(about -530 Vdc)?

Go to step 8. Go to step 6. Do not adjust

the variable resistors on the

power pack.

6. Does the FCU output

constant power and bias

trigger signals to the

power pack?

Clean the area around the

bias terminal. Go to step 7. Change the FCU.

7. Does the problem go

away if you change the

power pack?

Finished. Go to step 8.

8. Are the charge corona

unit and wire correctly

installed?

Check the connections

between the corona wire

and the FCU. Go to step 9.

Correct the problem.

9. Does the FCU output

constant power and

corona trigger signals to

the power pack?

Clean the charge corona

unit. Go to step 10. Change the FCU.

10. Does the problem go

away if you change the

power pack?

Finished. Go to step 11.

11. Does the quenching lamp

operate correctly? Go to step 13. Check the connections

between the FCU and lamp.

Go to step 12.

12. Does the FCU send

constant power and drive

signals to the lamp?

Replace the quenching

lamp. Replace the FCU.

13. Try replacing the master unit.

14. Clean the scanner optics, exposure glass, and white plate.

Check the SBU white waveform for peaks, dropouts, or noise in the signal. Change the

SBU or FCU if such wave patterns are present.

Adjust the RAM addresses containing contrast threshold levels.

1st August, 1994 TROUBLESHOOTING

COPY QUALITY TROUBLESHOOTING

6-4

Symptom: Stray toner flecks fused into the copy

Check Action if Yes Action if No

1. Clean the inside of the machine, especially around the development and transfer unit.

Clean the cleaning blade.

Clean the rollers in the fusing unit.

2. Replace the master unit or CTM.

Symptom: Previous copy shows faintly

Check Action if Yes Action if No

1. Does the quenching lamp

operate correctly? Clean or replace the master. Check the connections

between the FCU and lamp.

Go to step 2.

2. Does the FCU send

constant power and drive

signals to the lamp?

Replace the quenching

lamp. Replace the FCU.

Symptom: Density changes gradually across the printout

Check Action if Yes Action if No

1. Make a printer test (see

section 4-1-13). Is it OK? There may be a scanner

problem; go to step 3. Go to step 2.

2. Check that the charge corona wire is clean and that it is installed correctly.

Check that none of the laser optic components are out of position.

Check that toner is being distributed evenly across the development unit. If it is not,

change the CTM, development unit, or toner supply motor.

Try changing the master unit, quenching lamp, or the charge corona wire.

3. The xenon lamp may need to be changed.

4. Is the SBU scan line

alignment is correct (see

section 5-2-9)?

Change the FCU. Change the SBU.

Symptom: Uneven density in vertical bands

Check Action if Yes Action if No

1. Make a printer test (see

section 4-1-13). Is it OK? There may be a scanner

problem; go to step 3. Go to step 2.

2. Clean or change the charge corona wire.

Clean or change the quenching lamp.

Clean the laser optic components with a blower brush or dry cloth.

Check that toner is being distributed evenly across the development unit. If it is not,

change the CTM, development unit, or toner supply motor.

3. Clean the exposure glass, white plate, and scanner optics.

Change the xenon lamp, especially if bands appear on the sides of copies made using

copy mode.

4. Are there any bands in

the SBU white waveform

(see section 5-2-9)?

Change the SBU. Change the FCU.

Troubleshooting

TROUBLESHOOTING 1st August, 1994

COPY QUALITY TROUBLESHOOTING

6-5

Symptom: Uneven density in horizontal bands

Check Action if Yes Action if No

1. Does the xenon lamp

flicker? Change the lamp. Go to step 2.

2. Is there a clear boundary

between the bands? Clean the charge and

transfer corona units (there

could be a leak, so check if

any Auto Service Calls were

made).

Clean the development unit,

its bearings, and drive

mechanism. or replace the

master unit and/or

development unit.

Symptom: Thin vertical white lines

Check Action if Yes Action if No

1. Make a printer test (see

section 4-1-13). Is it OK? There may be a scanner

problem; go to step 5. Go to step 2.

2. Clean the grid plate, toner metering blade, and laser optics.

Clean or replace the corona wires.

Add toner if the toner supply is getting low.

Check for foreign objects around the master that could cause leakage of charge form

the belt.

3. Is the surface of the hot

roller scratched? Replace the component that

is damaging the hot roller,

then replace the hot roller.

If the hot roller strippers are

badly stained with toner,

replace them, and the

thermistor (or FCU or PSU).

Go to step 4.

4. Is the master scratched? Replace the component that

is doing the damage, then

replace the master.

Finished

5. Clean the white pressure plate above the exposure glass.

6. Are there any peaks in the

SBU white waveform

(see section 5-2-9)?

Change the SBU. Change the FCU.

Symptom: Fuzzy vertical white lines

Check Action if Yes Action if No

Clean or replace the corona wires.

Symptom: Wavy vertical black lines or bands

Check Action if Yes Action if No

The cleaning blade or toner metering blade may be dirty or damaged.

Replace the hexagonal mirror motor.

1st August, 1994 TROUBLESHOOTING

COPY QUALITY TROUBLESHOOTING

6-6

Symptom: Vertical dotted lines

Check Action if Yes Action if No

1. If the master is scratched, replace the master, and the component that is scratching it.

2. If the development roller is scratched, replace the roller, and the component that is

scratching it.

3. Clean the corona wires.

Symptom: Vertical black band at the left or right edge of the printout

Check Action if Yes Action if No

1. Make a printer test (see

section 4-1-13). Is it OK? There may be a scanner

problem; go to step 3. Go to step 2.

2. Make sure that the charge corona wire cleaner is at home position.

Clean the laser optics with a blower brush or soft dry cloth.

3. Clean the scanner optics.

Replace the xenon lamp.

Symptom: Vertical black lines or bands at constant positions on the copy

Check Action if Yes Action if No

1. Make a printer test (see

section 4-1-13). Is it OK? There may be a scanner

problem; go to step 5. Go to step 2.

2. Clean the thermistor, hot

and pressure rollers, and

hot roller strippers.

Change the cleaning pad

if it is dirty.

Is the surface of the hot

roller scratched?

Replace the component that

is damaging the hot roller,

then replace the hot roller.

If the hot roller strippers are

badly stained with toner,

replace them, and the

thermistor (or FCU or PSU).

Go to step 3.

3. Is the master scratched? Replace the component that

is doing the damage, then

replace the master.

Go to step 4.

4. Clean the corona wires and guide plates in the paper feed path.

Clean the quenching lamp.

Replace the toner metering blade if it is damaged.

Clean the laser optics carefully with a blower brush or soft dry cloth.

If the problem remains, change the FCU or LD unit.

5. Clean the white pressure plate above the exposure glass.

6. Are there any peaks in the

SBU white waveform

(see section 5-2-9)?

Change the SBU. Change the FCU.

Symptom: Defects at repeating intervals on the printout

Check Action if Yes Action if No

There is a defect on the master belt or on one of the rollers (the most likely ones are the

hot roller, pressure roller, or development roller

Symptom: Black streaks at the leading edge

Check Action if Yes Action if No

Clean the hot roller strippers or change the master unit.

Troubleshooting

TROUBLESHOOTING 1st August, 1994

COPY QUALITY TROUBLESHOOTING

6-7

Symptom: Black spots at the leading edge

Check Action if Yes Action if No

Clean inside the machine, especially around the fusing unit and transfer unit entrances.

Clean the transfer corona wire and check that it is installed properly.

If the problem remains, change the transfer corona wire or the power pack.

Symptom: Horizontal white lines or stripes across printouts

Check Action if Yes Action if No

1. Make sure that the user is using the correct type of copy paper, and storing it in a dry

place.

2. Does the printout have a

crease mark where the

white band appears?

Check the paper feed

mechanism and path from

paper feed through transfer;

correct any faults.

Go to step 3.

3. Does the development

bias terminal stay at a

constant voltage

(about -530 Vdc)?

Go to step 6. Go to step 4. Do not adjust

the variable resistors on the

power pack.

4. Does the FCU output the

power and bias trigger

signal to the power pack?

Clean the area around the

bias terminal. Go to step 5. Change the FCU.

5. Does the problem go

away if you change the

power pack?

Finished. Clean the development

roller. Go to step 6.

6. Clean the transfer corona unit (wire, endblocks, casing).

Check and replace any parts that may be causing the corona charge to leak.

7. Check that the development roller and master unit are both rotating smoothly, and that

the start and stop at the same time. If there are any problems, do the following:

a) Check the roller, master unit, and drive mechanism for any defective components,

such as gears.

b) Try changing the main motor.

Symptom: Black page with horizontal white stripes

Check Action if Yes Action if No

Replace the optic fiber cable from the main scan start detector.

If the problem remains, change the LD unit or FCU.

Symptom: Random black spots on the printout

Check Action if Yes Action if No

The grid plate may not be grounded properly. If the problem cannot be corrected, try

changing the charge corona unit, which contains the grid plate.

If the surface of the development roller is dirty, clean it.

The laser diode may be out of control. Change the LDDRor FCU.

Symptom: Horizontal black stripes

Check Action if Yes Action if No

1st August, 1994 TROUBLESHOOTING

COPY QUALITY TROUBLESHOOTING

6-8

Symptom: Horizontal black stripes

1. Is the Call Service

indicator lit? Replace the LD unit or FCU. Go to step 2.

2. Check that the master unit is installed properly and correctly grounded.

Change the master unit if it is damaged.

If the problem only occurs in copy mode, the xenon lamp may be flickering: change the

lamp, driver, or FCU.

If the problem remains, go to step 3.

3. Does the development

bias terminal stay at a

constant voltage

(about -530 Vdc)?

Go to step 6. Go to step 4. Do not adjust

the variable resistors on the

power pack.

4. Does the FCU output the

power and bias trigger

signal to the power pack?

Clean the area around the

bias terminal. Go to step 5. Change the FCU.

5. Does the problem go

away if you change the

power pack?

Finished. Clean the development

roller. Go to step 6.

6. Check that the toner metering blade is screwed in securely.

Symptom: White spots in black areas

Check Action if Yes Action if No

Clean the development roller (soft cloth and alcohol).

Clean the corona wires.

If the problem cannot be solved, change the development unit, master, or power pack.

Symptom: Data missing at the leading edge

Check Action if Yes Action if No

1. Does the problem only

occur during copying? Go to step 2. Go to step 3.

2. Check that the scan line sensor is in the correct position.

Try changing the FCU.

3. Is the correct type of copy paper being used, and is it curled at the leading edge?

Check for dust on the rollers in the paper feed path.

Lower cassette: Is the registration mechanism working correctly?

Troubleshooting

TROUBLESHOOTING 1st August, 1994

COPY QUALITY TROUBLESHOOTING

6-9

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