TAG 070: Fuser Unit Malfunction
3-70 Troubleshooting Analysis Guide (TAGs) June 1999
19
Turn the printer off and unplug the power cord.
• Disconnect J/P70 and J/P10.
• Check P70-1 to P10-1 for continuity.
Is there continuity?
No: Repair or replace the connectors or wiring from P70-1 to P10-1, then turn to TAG 002:
Check & Problem Resolution.
Yes: Continue.
20
Check P70-2 and P10-2 for continuity.
Is there continuity?
No: Repair or replace the connectors or wiring from P70-2 to P10-2, then turn to TAG 002:
Check & Problem Resolution.
Yes: Continue.
21
Reconnect J/P70.
• Connect negative lead of meter to P10-2 and positive lead of meter to P10-1.
Is the resistance approximately 550K
Ω
?
No: Replace the AC power supply, then turn to TAG 002: Check & Problem Resolution.
Yes: Continue.
22
Disconnect J/P12.
• Check J10-2 (power control #2 board) for continuity to ground.
Is there continuity?
No: Continue.
Yes: Replace the power control #2 board, then turn to TAG 002: Check & Problem Resolu-
tion.
23
Reconnect J/P10 and J/P12.
• Disconnect J/P40.
• Check P40-36 for continuity to ground.
Is there continuity?
No: Replace the PCL board, then turn to TAG 002: Check & Problem Resolution.
Yes: Repair or replace the connectors or wiring from P40-36 to P12-1, then turn to TAG 002:
Check & Problem Resolution.
24
Power-on-reset the printer.
• Check TP3-36 on the PCL board for a voltage change from +24 Vdc to 0 Vdc during the 15 sec-
onds after the output tray jogging test.
Does the voltage change from +24 Vdc to 0 Vdc?
No: Replace the PCL board, then turn to TAG 002: Check & Problem Resolution.
Yes: Go to #11 in this TAG.
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