Xerox 7142 Service Manual - page 316

9 Troubleshooting

RJ-901C/RJ-900C 　 Maintenance Manual

9-72

9.3.6

Online Function Problems

Table 9-14  Symptoms, Check Items, and Actions for Online Function Problems

No.

Event/symptom

Check item

Action

Reference

1

USB interface cannot 

establish communication.

1. Does computer in use 

support USB?

Windows95 does not support 

USB officially. If you use 

Windows95, use computer 

with Windows98 or higher 

OS installed.

-

2. Does the same error 

occur even if you use 

another USB port on 

the computer?

Use another USB port on the 

computer.

-

3. Are you using USB 

hub?

•

Cascade connection 

using USB hub is 

available up to 5 stages.

•

If the plotter operates 

normally without using 

USB hub, replace USB 

hub.

•

Instruct users to use USB 

hubs compliant with 

USB2.0 Hi-Speed 

standard.

-

4. Attempt 

communication with 

PC on hand.

Replace USB cable. 

-

5. Does the same error 

occur even if interface 

cable is changed?

Communication error may 

be caused by an open circuit 

in interface cable or too long 

cable length. Instruct users to 

use cables compliant with 

USB2.0 Hi-Speed standard.

-

6. Plotter driver may be 

defective.

Update plotter driver.

-

7. Program ROM may be 

defective.

Update firmware.

"7.3.5 

Firmware 

Installation" 

p.7-15

8. Main board assembly 

may be defective.

Replace main board 

assembly. 

"4.3.3 

Replacing 

Main Board 

Assembly" 

p.4-21

2

Scaling does not work 

correctly.

1. Plotter driver may be 

defective.

Update plotter driver.

Operation 

Manual