Xerox 8500DN Service Manual - Page 108
V Power Supply Fault Troubleshooting Procedure - specs
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UPC - 095205022063
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Error Messages and Codes 50V Power Supply Fault Troubleshooting Procedure Step Questions and Actions Yes No 1 Check for a short in the Electronics Module. Go to Step 2. Go to Step 2. NOTE Damage to circuits within the Electronics Module may occur if the power supply capacitors are not allowed to fully discharge. NOTE It is possible that the power supply is not shorted, but instead is out of spec and can lead to an error condition. 1. Measure the 50 V power supply output. The test point is located on the power control board below the main board RAM DIMMs. 2. Is the power supply within specification? 3. Turn Off the printer and wait 30 seconds for the capacitors to discharge. 2 1. Unplug the following Electronics Module Go to Step 3. Replace the connectors. This step disconnects all Electronics other external circuits so the Electronics Module. Module can be tested alone: ■ Power Control to I/O board (J800 - gray ribbon cable on right side) ■ Power Control right (J400 - 16 wire, multi-color) ■ Printhead data interface (J130 - gray ribbon cable on top side) ■ Wave amp signal (J790) short gray ribbon cable located on left side) ■ Printhead power connector ■ Power Control left (J390 - 34 wire, multicolor) ■ Y-Axis motor (J280) 2. Turn on power to the printer. Do the PE and PS indicators (near the power switch) flash momentarily? 3 1. Turn off the printer and wait 30 seconds Go to Step 4. Go to Step 5 for power supply capacitors to discharge. 2. Plug in the power control to I/O board connector (J800). 3. Turn on power to the printer. Do the PE and PS indicators flash momentarily? 4 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 (see "Measuring DC Power Supply Voltages" on page 65). Replace the defective part. Retest the printer. 3-40 Phaser 8400/8500/8550/8560 Color Printer Service Manual
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