Epson 2080 Service Manual - Page 42

Unit Level Troubleshooting, Repairing the C166 PSB/PSE Board, Repairing the C273 Main Board

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LQ-2080 5.3 Unit Level Troubleshooting The information for this section is the same as for the LQ-2070 except for the point below: Point: Main board number C186 Main Board → C273 Main Board 5.4 Repairing the C166 PSB/PSE Board See LQ-2070 Service Manual. 5.5 Repairing the C273 Main Board This section provides instructions to repair the C273 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 C273 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. Revision A Table 5-2. Repairing the C272MAIN Board (1/3) Problem Cause Checkpoint Solution The printer does Reset IC2 is not operate at all. defective. Check the voltage waveforms of the VCC signal (CH1: IC2 pin 3) and VOUT signal (CH2: IC2 pin 1) when power is turned on. Replace IC2. The PROM (IC10) is not selected. Check for a change in the Replace IC10 signal from HIGH/LOW at pin (or replace the 22 of IC10. main board). The PSRAM (IC8) is not selected. Check for a change in the Replace IC8 (or signal from HIGH/LOW at pin replace the main 22 of the IC. board). Troubleshooting Unit Level Troubleshooting 42

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LQ-2080
Revision A
Troubleshooting
Unit Level Troubleshooting
42
5.3
Unit Level Troubleshooting
The information for this section is the same as for the LQ-2070 except
for the point below:
Point: Main board number
5.4
Repairing the C166 PSB/PSE Board
See LQ-2070 Service Manual.
5.5
Repairing the C273 Main Board
This section provides instructions to repair the C273 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 C273
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)
<LQ-2070>
<LQ-2080>
C186 Main Board
→
C273 Main Board
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 1) 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) is not
selected.
Check for a change in the
signal from HIGH/LOW at pin
22 of the IC.
Replace IC8 (or
replace the main
board).