Xerox 7142 Service Manual - page 305

RJ-901C/RJ-900C 　 Maintenance Manual

9 Troubleshooting

9-61

18

Poor accuracy of 

segment length in head 

travel direction (main 

scan direction).

1. Is working 

environment 

appropriate?

Use machine under specified 

environment.

"3.5 

Choosing a 

Place for the 

Plotter" p.3-10

2. Is CR belt tension 

adjusted to 

specification?

Adjust CR belt tension.

"7.6 CR 

Belt Tension 

Adjustment" 

p.7-25

3. Is T fence 

contaminated?

•

Clean  T  fence.

•

If T fence is still 

contaminated or 

damaged, replace T 

fence.

"4.5.4 

Replacing T 

Fence" p.4-33

4. Internal process of 

main board assembly 

may be abnormal.

Initialize parameters and 

reenter or modify them. 

Then, check machine 

operation again.

"5.8.1 

Parameter 

Initialization 

Menu" p.5-52

19

Poor linearity in head 

scan direction 

(straightness)

1. Is suction fan run as 

normal when checked 

through "Test: Fan" of 

self-diagnosis 

function?

•

Check connection of 

following main board 

assembly connectors. 

•  Suction 1 fan cable: 

J128

•  Suction 2 fan cable: 

J127

•  Suction L fan cable: 

J126

•

Replace suction fan 

assembly. 

•

Replace cable of suction 

fan that does not operate 

normally.

"4.9.1 

Replacing 

Suction Fan 

Assembly" 

p.4-62

2. Is PF driving pulley 

loose?

Replace PF motor assembly. 

"4.4.1 

Replacing PF 

Motor 

Assembly" 

p.4-26

3. Is PF speed reduction 

belt tension adjusted to 

specification?

Adjust PF speed reduction 

belt tension.

"(2) 

Confirming 

Completion of 

Installation to 

Plotter" p.7-17

Table 9-11  Symptoms, Check Items and Actions for Printing Problems(Continued)

No.

Symptom

Check item

Action

Reference