Xerox Phaser 6280, Service Manual, Page: 357 / 672

Phaser 6280 Color Laser Printer Service Manual 4-69
General Troubleshooting
7 Check the Toner Sensor Harness for
continuity.
1. Disconnect P/J Harnesses from the MCU
Board and the Print Cartridge Sensor.
■
Yellow: P/J19 and P/J191
■
Magenta: P/J19 and P/J192
■
Black: P/J19 and P/J193
■
Cyan: P/J19 and P/J194
2. Check continuity between P/J
connectors:
■
Yellow: P/J19 pin <=> P/J191
■
Magenta: P/J19 <=> P/J192
■
Black: P/J19 <=> P/J193
■
Cyan: P/J19 <=> P/J194
Go to step 8. Replace the
Toner Sensor
Harness.
8 Check the Print Cartridge Sensor signal.
1. Disconnect P/J19 from the MCU Board.
2. Is there +3.3 V across the Toner Sensor
Harness?
■
Yellow: J19-1 pin <=> J19-2 pin
■
Magenta: J19-4 pin <=> J19-5 pin
■
Black: J19-7 pin <=> J19-8 pin
■
Cyan: J19-10 pin <=> J19-11 pin
Go to step 9. Replace the
MCU Board
(page 8-86).
9 Check the Print Cartridge Sensor for
operation.
1. Measure the voltage across:
■
Ground <=> P/J19-3 pin (Yellow)
■
Ground <=> P/J19-6 pin (Magenta)
■
Ground <=> P/J19-9 pin (Black)
■
Ground <=> P/J19-12 pin (Cyan)
2. Does the voltage change when the paper
is inserted into the sensor detecting
point?
Replace the
MCU Board
(page 8-86). Replace the
Print
Cartridge
Sensor
(page 8-55)
Troubleshooting Procedure Table (continued)
Step Actions and Questions Yes No