3 - 80
Phaser 840/850/860/8200 Color Printer - Service Manual
Inoperative printer problems.
Refer to Appendix Electronics Troubleshooting Checklist.
The printer shuts down with the power switch on.
The printer may have experienced a spurious over-current event. If the printer powers-up
within 2 seconds, do nothing. If the printer powers-up after 6 seconds, the printer power
supply has auto-ranged to the 220 VAC setting
Remove the power cord, wait 30 seconds, then reinstall the power cord. The printer
should power-up at its 110 VAC setting within two seconds, refer to SF156, Phaser 840
only.
If the fans “twitch” and the LEDs flash,
There may be a short in the power supply system. Refer to the later procedure "Testing
for shorted drivers" on page 3-83.
If the fans do not move and the LEDs do not flash,
There is either no AC power to the printer or the power supply has failed. Check the AC
voltage. If replacing the power supply does not correct the problem, refer to the later
procedure "Testing for shorted drivers" on page 3-83.
There are no lights and no sound upon power up (Phaser 850).
A manufacturing process error resulted in some power control board brackets getting bent.
The serial number range for this potential problem is M0A7600 to M0D3800. These bent
brackets prevent the 40v loopback connector from fully seating, and in some cases can
result in it disconnecting due to shipping vibrations. When the power switch is turned on
with a disconnected 40v loopback connector, the front and rear panel LED's will blink
briefly and go out, and the printer will appear to have no power.
See ***SF169***
Main Board CPU operation
The main board has sophisticated self-test capabilities. The main board is usually not the
cause of the fault unless an error code specifically indicates a potential main board fault.
Refer to Appendix Electronics Troubleshooting Checklist. A few rare conditions were
specifically not included in the checklist:
■
The power switch is turned off and the printer remains on. Check the DIP
switches, then pull the plug and reseat the main board.
■
If LEDs blink and then hang (either both off/on/unknown combination) the
issue is unknown. Reseat everything, then replace the main board.
Also, refer to "Error Codes and Messages" on page 2-37 and "System power-up
sequence" on page 3-76.
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