HP 8550 Service Manual - Page 515
E805 printer, motor lock signal FAN1LK goes to one 1 for 1.5 seconds or more
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E805 (printer) The heat discharge fan 1 (FM, used for the fusing assembly and area near the feeding assembly) is faulty. This error occurs when the motor lock signal (FAN1LK) goes to one (1) for 1.5 seconds or more while the fan is rotating. Cause Connectors (heat discharge fan 1 drive assembly) Step 1 Connectors (24 2 V for heat discharge fan 1 drive) Heat discharge 3 fan 1 Developing 4 rotary motor PCB Main relay PCB 5 The dc power 65 Checks Y/N Are connectors J702 and J706 on NO the developing rotary motor PCB and connector J220 on the dc controller PCB connected securely? Are connector J701 on the NO developing rotary motor PCB, connectors J648 and J641 on the main relay PCB, and J102 on the dc power supply connected securely? Does the voltage change to about YES 24 V between connectors J702-3 (FAN1ON) on the developing rotary motor PCB and J702-1 (GND)? Does the voltage change to about YES 24 V between connectors J701-1 (+24 VB) and J701-2 (GND) on the developing rotary motor PCB immediately after the copier is turned on? Does the voltage between connectors J641-1 (+24 VB) and J641-4 (GND) on the main relay PCB change to 24 V immediately after the copier is turned on? YES Is the dc power present? NO YES Action Connect the connectors securely. Connect the connectors securely. Replace the heat discharge fan 1. Replace the developing rotary motor PCB. Replace the main relay PCB. See "No dc power in the printer (+5V, +24 VB)" on page 522. Replace the dc controller PCB. EN Copy module troubleshooting 513