Unit Level Troubleshooting - Epson Stylus PHOTO 820 Service Manual

EPSON Stylus PHOTO 810/820

3.3 Unit Level Troubleshooting

You can identify the troubles by using the checklist in this section after confirming the
LED indication on the printer. If you connect the printer to your PC and see an error
message on the STM3, you can short the total repair time. And, when you find out the
defective parts, replace them by referring the Chapter 4 "Disassembling". Following
tables describe the error condition (LED and STM3), possible cause and check point.
LED indication
Error condition
STM3 message
Power : Off
Error : On
Fatal error
General error
Troubleshooting
Table 3-4. Fatale error condition and possible cause
Occurrence CR position at the
timing power on timing
Outside HP
Power on
Paper guide upper/left
Anywhere
Operation -
Unit Level Troubleshooting
The following is the example of how to use the table.
When the CR unit is out of the home position at the power on timing, the fatal error
may be caused by the failure of the CR motor. Moreover, there are 3 possible causes on
the CR motor failure.
[Note]
When the individual part of the Paper eject roller, PF motor and the Ink system unit is
defective, replace the Printer mechanism to new one basically.
However, if the individual part is replaced to new one in the urgent case,
reassemble it carefully by referring to Chapter 4.
Defective
unit/part name
The CR motor connector cable comes off.
CR motor The CR motor is defective.
The CR motor connector cable is damaged.
Holder shaft unit The Paper return plate disturbs the rotation of the LD roller.
The PF motor connector cable comes off.
PF motor The PF motor is defective.
The PF motor connector cable is damaged.
The Paper guide upper/left comes off completely.
Pump unit The Compression spring 1.764 comes off.
Main board The Main board is defective.
Main frame The Main frame is deformed.
Front frame The Front frame is bent up.
Main frame The Main frame is deformed.
Possible cause
Refer to Table 3-5
Revision A
disassembly/
Check table
58