HP C30 - TAG 750: Counter Malfunction

TAG 750: Counter Malfunction
June 1999 Troubleshooting Analysis Guide (TAGs) 3-139
TAG 750: Counter Malfunction
Error Code: 750
Symptoms: Counter does not count
Counter counts too often
Consumable components require replacement too frequently
Possible Defects: Counter assembly
Connectors or wiring
PCL board
1 Run diagnostic test 007.
Is the counter functioning properly?
No: Continue.
Yes: The counter is working correctly. Turn to TAG 002: Check & Problem Resolution.
2 Verify that J/P41, J/P81, and J/P82 are connected properly.
• Run diagnostic test 007.
Is the counter functioning properly?
No: Continue.
Yes: Loose connectors were at fault. Turn to TAG 002: Check & Problem Resolution.
3 Is the counter either counting when it shouldn’t or counting too many times?
No: Go to #5 in this TAG.
Yes: Continue.
4 Replace the counter.
• Run test prints.
Has the problem been resolved?
No: Replace the PCL board, then turn to TAG 002: Check & Problem Resolution.
Yes: The counter was at fault. Turn to TAG 002: Check & Problem Resolution.
5 Check TP4-26 for +24 Vdc.
Is the voltage +24 Vdc?
No: Replace the PCL board, then turn to TAG 002: Check & Problem Resolution.
Yes: Continue.
6 Check TP4-25 for +24 Vdc.
Is the voltage +24 Vdc?
No: Go to #8 in this TAG.
Yes: Continue.