HP 8550 Service Manual - Page 501

Developing 5 rotary position sensor Developing 6 rotary stopper Developing 7 rotary motor PCB Fuse 8 (developing rotary motor PCB) Replace the developing rotary position sensor. Is the problem corrected? YES Is the operation of the developing NO rotary stopper arm normal? Disconnect connector J705 of the developing rotary stop solenoid (SL5); then, measure the resistance between connectors J605-10 and J605-12 on the harness side and between J70511 and J705-12. Is it about 30Ω to 60Ω? Does the voltage between YES connectors J220-A6 (RLSROT) and J220-B5 (GND) on the dc controller PCB change from about 0 to about 3.5 V immediately after the copier is turned on? Is the fuse (FU701, FU702) on the YES developing rotary motor PCB NO blown? End. Replace the developing rotary stopper solenoid. Replace the developing rotary motor PCB. Replace the fuse. Replace the developing rotary motor. If the problem cannot be corrected, replace the dc controller PCB. E032 The counter for the copy data fails to operate. This error occurs when the illegal prevention bit of the control device goes to zero (0) when the open circuit detection mechanism is not disabled. EN Copy module troubleshooting 499