Xerox 7142 Service Manual page 318

9 Troubleshooting
Table 9-14 Symptoms, Check Items, and Actions for Online Function Problems(Continued)
No. Event/symptom
4 Some data are not
printed (missing).
Some data change to
garbage.
Check item
1. Plotter driver may be
defective.
2. Program ROM may be
defective.
3. Is T fence
contaminated or worn
out?
4. Check "CR Encoder"
from "Test: Encoder"
of self-diagnosis
function.
5. Main board assembly
may be
malfunctioning.
9-74
RJ-901C/RJ-900C Maintenance Manual
Action
Update plotter driver.
Update firmware.
• If grease or dust collect:
Wipe fence with a dry
cloth.
• If ink deposit presents:
Wipe it off with cloth
dampened with neutral
detergent.
• If contamination or
deposit is too heavy:
Replace T fence.
• Move carriage in both
directions and check the
numeral value on LCD.
If the numeral value
doesn't change
normaly,check main
board assembly
connector J129.
• Replace T fence.
• ReplaceTF_ENC
assembly.
• Replace CR motor
assembly.
• Replace CR board
assembly.
• Replace CR cable.
Replace main board
assembly.
Reference
Operation
Manual
"7.3.5
Firmware
Installation"
p.7-15
"4.5.4
Replacing T
Fence" p.4-33
"4.3.3
Replacing
Main Board
Assembly"
p.4-21
"4.5.4
Replacing T
Fence" p.4-33
"4.5.1 CR
Motor
Assembly"
p.4-30
"4.10.1
Replacing CR
Board
Assembly"
p.4-64
"4.10.3
Replacing CR
Tape Wire"
p.4-68
"4.3.3
Replacing
Main Board
Assembly"
p.4-21