Epson LQ-2180 - Connecting to Computer and Software Installation

LQ-2180 Revision A
Troubleshooting Unit Level Troubleshooting 41
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
 Point: Flowchart 2-1
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.
Table 5-2. Repairing the C272MAIN Board (1/3)
C165 MAIN Board
→
272MAIN Board
CN12
→
CN12 or CN16
Problem Cause Checkpoint Solution
The printer does
not operate at all.
Reset IC2 is
defective.
Check the voltage
waveforms of the VCC signal
(CH1: IC2 pin 3) and VOUT
signal (CH2: IC2 pin 2) when
power is turned on.
Replace IC2.
The PROM
(IC10) is not
selected.
Check for a change in the
signal from HIGH/LOW at pin
22 of IC10.
Replace IC10
(or replace the
main board).
The PSRAM
(IC8)
Check for a change in the
signal from HIGH/LOW at pin
1 of the IC8.
Replace IC8 (or
replace the main
board).
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