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Phaser 8400/8500/8550/8560 Color Printer Service Manual 3-41
Error Messages and Codes
5 To isolate the problem to the I/O Board or its
related cabling, unplug these I/O Board
connectors.
■ Umbilical Right J1
■ Waste Tray Sense J110
■ Stripper Solenoid J250
■ Paper Tray Sense J610
■ Ink load Signal J910
■ DMU Sense J860
■ Drum Thermistor J870
■ Exit Module J680
■ Heater Relay Control J950
Test the resistance of the I/O board to Pin1
of J270.
Is the resistance still less than 1K ohm?
Replace the
I/O Board.
Go to Step 6.
6 1. Plug in the I/O Board connectors one at a
time and retest the resistance.
2. Replace components until you find one
that creates a short at J270, Pin 1.
Find any shorted components?
Leave power
on to ensure
the problem is
fixed.
Go to Step 7.
7 Connect the Wave Amp.
Any problems?
Leave power
On to ensure
the problem is
fixed.
Go to Step 8.
8 Connect the Printhead. Apply power
and retest.
Complete.
8400 PEST Description 8500/8550/8560 PEST description
37,017.44: Deskew Clutch Disconnect.
The Deskew Clutch is not
drawing the expected power.
Head Maintenance Clutch
Disconnect. The Head Maintenance
Clutch is not drawing the expected
power.
37,018.45: Main Tray Pick Clutch
disconnect. The Main Tray Pick
Clutch is not drawing the
expected power.
Main Tray Deskew Clutch
Disconnect. The Main Tray Deskew
Clutch is not drawing the expected
power.
37,019.46: Tray 1 Pick Solenoid
Disconnect. The tray 1 Pick
Solenoid is not drawing the
expected power.
Main Tray Pick Clutch Disconnect.
The Main Tray Pick Clutch is not
drawing the expected power.
37,020.47: Strip Solenoid disconnect. The
strip solenoid is not drawing the
expected power.
Tray 1 Pick Solenoid Disconnect.
The Tray 1 Pick Solenoid is not
drawing the expected power.
37,021.48: Strip Solenoid disconnect. The
Strip Solenoid is not drawing the
expected power from the supply.
50V Power Supply Fault Troubleshooting Procedure (Continued)
Step Questions and Actions
Yes No