Repair By Unit Replacement - Epson C117001-N - DFX 5000+ B/W Dot-matrix Printer Service Manual

Troubleshooting

5.2 REPAIR BY UNIT REPLACEMENT

You can correct most problems by replaang the unit and
Refer to Table 5-3, identib the problem, and&n follow the steps in &e flowchart indicated.
Table 5-3. Symptoms and Reference Pages
Symptom
The printer does not operate
when the wwer is on.
Carriage operation is
abnormal.
Carriage operation is normal,
but the self-test is printed
incorrectly.
Printing is normal, but paper
feeding is abnormal.
Control panel operation is
abnormal.
Data sent by the host
computer is printed
incorrectly.
Note: Be
sure to perform the appropriate adjustments below.
1. When you replace the C117 MAIN board assembly, perform these adjustments:
2. When you replace or disassemble the PG motor orPG sensor, perforrnthese adjustments:
3. When you replace or disassemble the CR motor, perform the carriage timing belt tension
adjustment.
4. When you disassemble the printer mechanism, perform these adjustments:
I
I
power on.
the printer fails to enter ready mode.
Cl Some of the dots are not printed.
self-test is printed correctly, but print data from the
host computer is not printed cofrectly.
tension adjustment
Problem
-
1
2
3
4
I
6
Rev. A