HP 8550 Service Manual - Page 516
E806 printer, while the fan is rotating.
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E806 (printer) The heat discharge fan 2 (FM2, used for the area around the intermediate transfer drum) is faulty. This error occurs when the fan motor lock signal (FAN2LK) goes to one (1) for 1.5 seconds or more while the fan is rotating. Cause Connectors (heat discharge fan 2 drive assembly) Connectors (24 V for heat discharge fan 2 drive) Step 1 2 Heat discharge 3 fan 2 Developing 4 rotary motor PCB Main relay PCB 5 The dc power 6 (printer unit) Checks Y/N Are connectors J603 and J706 on NO the developing rotary motor PCB and connector J220 on the dc controller PCB connected? Is connector J701 on the NO developing rotary motor PCB, connectors J648 and J641 on the main relay PCB, and connector J102 on the dc power supply connected securely? Does the voltage change to about YES 24 V between connector J703-3 (FAN2ON) and J703-1 (GND) on the developing rotary motor PCB immediately after the copier is turned on? Does the voltage change to about 24 V for connector 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 change to 24V between connectors J641-1 (+24 VB) and J641-4 (GND) on the main relay PCB immediately after the copier is turned on? YES Is the dc power present in the NO printer unit? YES Action Connect the connectors securely. Connect the connectors securely. Replace the heat discharge fan 2. 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. 514 Chapter 7 - Troubleshooting EN