Unit Level Troubleshooting; Repairing The C165 Psb/Pse Board; Repairing The C272Main Board - Epson 2180 - LQ B/W Dot-matrix Printer Service Manual

LQ-2180

5.3 Unit Level Troubleshooting

The information for this section is the same as for the LQ-2170 except
for some points. The points to be changed are as follows:


Point: All flowcharts provided in this section
C165 MAIN Board


Point: Flowchart 2-1
CN12

5.4 Repairing the C165 PSB/PSE Board

The entire information for this section is the same as for the LQ-2170.

5.5 Repairing the C272MAIN Board

This section provides instructions to repair the C272 MAIN board
assembly. It describes various problems, symptoms, likely causes, and
solutions. The checkpoint column provides proper waveforms,
resistance values, and other information for each component of C272
MAIN Board.
NOTE: This information is necessary only for servicers who repair to
the component level. Servicers who repair to the unit level
(including all servicers in the U.S.) can ignore this section.
Troubleshooting
272MAIN Board
CN12 or CN16
Unit Level Troubleshooting
Table 5-2. Repairing the C272MAIN Board (1/3)
Problem Cause
The printer does Reset IC2 is
not operate at all. defective.
The PROM
(IC10) is not
selected.
The PSRAM
(IC8)
Revision A
Checkpoint Solution
Check the voltage Replace IC2.
waveforms of the VCC signal
(CH1: IC2 pin 3) and VOUT
signal (CH2: IC2 pin 2) when
power is turned on.
Check for a change in the Replace IC10
signal from HIGH/LOW at pin (or replace the
22 of IC10. main board).
Check for a change in the Replace IC8 (or
signal from HIGH/LOW at pin replace the main
1 of the IC8. board).
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