Xerox 7142 Service Manual page 296

9 Troubleshooting
Table 9-11 Symptoms, Check Items and Actions for Printing Problems(Continued)
No. Symptom
7 Machine outputs all
black printing.
8 Blocky printing
quality.
9 Blocky image printing.
10 CR line seems dotted.
11 White or black lines
appear. (No missing or
ink crooking in step
patters in location 1G -
7G in "Test Print")
Check item
1. Check connection of
head cable connectors
on CR board assembly
side and print head
side.
• Is head cable inserted
obliquely?
• Is it locked securely?
2. Is CR cable inserted
obliquely?
3. CR cable assembly
may be damaged.
4. Is print head damaged? Replace damaged print head
5. CR board assembly
may be
malfunctioning.
6. Main board assembly
may be damaged.
1. Is working
environment
appropriate?
9-52
RJ-901C/RJ-900C Maintenance Manual
Action
Reconnect head cable.
Reconnect main board
assembly connectors J110 -
J114 and CR board assembly
connectors J201 - J205.
Replace CR cable assembly.
assembly.
Replace CR board assembly.
Replace main board
assembly.
Use machine under specified
environment.
Reference
"4.6.1
Replacing
Print Head"
p.4-37
"4.10.1
Replacing CR
Board
Assembly"
p.4-64
"4.3.3
Replacing
Main Board
Assembly"
p.4-21
"4.10.1
Replacing CR
Board
Assembly"
p.4-64
"4.10.3
Replacing CR
Tape Wire"
p.4-68
"4.6.1
Replacing
Print Head"
p.4-37
"4.10.1
Replacing CR
Board
Assembly"
p.4-64
"4.3.3
Replacing
Main Board
Assembly"
p.4-21
"3.5
Choosing a
Place for the
Plotter" p.3-10