HP 8550 Service Manual - Page 518
E809 printer, turn on at power-on or when the cover is opened/closed.
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E809 (printer) The power supply cooling fan (FM4, used for the area around the copy module main power supply) is faulty. This error occurs when the fan error signal (FANERR) goes to zero (0) for 1.5 seconds or more while the fan is rotating. Cause Step Connectors 1 (power supply cooling fan drive assembly) Power supply 2 (cooling fan) The dc power 3 Checks Y/N Are the relay connector J2031, NO connectors J7 and J8 on the copy module main power supply PCB, and connector J1602 on the reader controller PCB connected securely? Does the voltage change to 24 V between connectors J7-3 (+24 VB) on the copy module main power supply PCB and J7-4 (GND) immediately after the copier is turned on? YES Is dc power present in the copy NO module? YES Action Connect the connectors securely. Replace the power supply cooling fan. See "No dc power to the copy module" on page 520. Replace the dc controller PCB. E810 (printer) This error occurs when the drum cartridge detecting switch does not turn on at power-on or when the cover is opened/closed. Cause Step Drum cartridge 1 Drum cartridge 2 switching lever Drum cartridge 3 switching guide Connector 4 (memory inside the drum cartridge) Memory (inside 5 the drum cartridge) Checks Y/N Is the drum cartridge set in the NO copier correctly? Check the drum cartridge YES switching lever on the printer side. Is it displaced or cracked? Is the drum cartridge switching guide defective? YES Are connector J209 on the dc NO controller PCB and relay connectors J47 and J48 connected securely? Replace the drum cartridge. Is the YES problem corrected? NO Action Set the cartridge correctly, and turn the copier off and then on. If the lever is displaced, set it to the correct position. If the lever is cracked, replace it. Replace the drum cartridge. Connect the connectors securely. End. Replace the dc controller PCB. 516 Chapter 7 - Troubleshooting EN