HP C30 - Page 170

TAG 500: +5 Vdc Power Malfunction
3-116 Troubleshooting Analysis Guide (TAGs) June 1999
19 Turn the printer off.
• Reconnect J/P333.
• Disconnect J/P73, the DC cable for the attachment option.
• Turn the printer on.
• Check J/P8-10 for +5 Vdc.
Is the voltage +5 Vdc?
No: Replace the signal interface board, then turn to TAG 002: Check & Problem Resolution.
Yes: Replace the attachment option, then turn to TAG 002: Check & Problem Resolution.
20 Turn the printer off.
• Reconnect J/P333.
• Disconnect J/P323.
• Turn the printer on.
• Check J/P8-10 for +5 Vdc.
Is the voltage +5 Vdc?
No: Replace wire harness W127 or W128, then turn to TAG 002: Check & Problem Resolu-
tion.
Yes: Continue.
21 Turn the printer off.
• Disconnect J/P310, found inside the duplex tray.
• Check P310-3 for continuity to ground.
Is there continuity to ground?
No: Replace the duplex control board #2, then turn to TAG 002: Check & Problem Resolu-
tion.
Yes: Repair or replace the connectors or wiring from J323-3 to J/P305-3 to P310-3, then turn
to TAG 002: Check & Problem Resolution.
22 Turn the printer on. Use extreme caution:
• Check from J/P6-1 to J/P6-2 (neutral) for 100 Vac or more.
Is the voltage at least 100 Vac?
No: Continue.
Yes: Replace the DC power supply unit, then turn to TAG 002: Check & Problem Resolution.
23 Use extreme caution: Check from J/P4-7 to J/P4-8 (neutral) for 100 Vac or more.
Is the voltage at least 100 Vac?
No: Replace the AC power supply unit.
Yes: Repair or replace the connectors or wiring from:
P4-7 to P6-1 or
P4-8 to P6-2;
then turn to TAG 002: Check & Problem Resolution.