3-40 WorkCentre C2424 Service Manual
4
1. If the 50V Power Supply LED (viewed thru the cooling grill below the power cord
receptacle) illuminates, the short is on one of the external devices you unplugged
earlier. In this case, systematically turn off the printer, plug a wiring harness back
in, and turn the printer on until the 50V supply fails.
2. Replace the defective part. Retest the printer.
5
1. To isolate the problem to the I/O board or its
related cabling, unplug the I/O board
connectors. Umbilical Right J1
■ Waste Tray Sense J110
■ Stripper Solenoid J250
■ Paper Tray Sense J610Ink load Signal J910
■ DMU Sense J860
■ Drum Thermistor J870
■ Exit Module J680
■ Heater Relay Control J950
2. Test the resistance of the I/O board.
3. 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 the component that creates a short at J270.
50V Power Supply Fault Troubleshooting Procedure (Continued)
Step Questions and Actions Yes No
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