HP 8550 Service Manual - Page 495
Numbered error codes, E000/E003 printer - review
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Note Numbered error codes These error messages appear on the copy module LCD at the time they occur. A history of errors can be reviewed through the copy module service mode (COPIER > DISPLAY > ERR). See "Service mode" on page 60. Errors described as "printer" or "printer unit" will also appear as error messages on the printer's LCD. E000/E003 (printer) E000:The fusing assembly warm-up is faulty. This error occurs when it takes longer than the reference time for the assembly to reach the standby temperature after the fusing heater has been turned on. E003:The fusing temperature is abnormally low. This error occurs when the fusing assembly temperature drops below 120° C after it has reached the target value. Cause Step Upper 1 thermistor (open circuit) Lower 2 thermistor (open circuit) Upper fusing 3 heater, upper thermal switch (open circuit) Lower fusing 4 heater, lower thermal switch (open circuit) Upper or lower 5 thermistor Upper or lower 6 thermistor Checks Y/N Remove the fusing assembly, and NO measure the resistance between connectors J26F-A4 (FXTHU) and J26F-A3 (GND) on the fusing assembly side. Is it between 250 KΩ and 600 KΩ (normal temperature)? Measure the resistance between NO connectors J26F-A2 (FXTHL) and J26F-A1 (GND) on the fusing assembly side. Is it between 250 KΩ and 600 KΩ (normal temperature)? With the fusing assembly NO removed, is there electrical continuity between connectors J27F-3 (HTUH) and J27F-4 (HTUC) on the fusing assembly side? Is there electrical continuity NO between connectors J26F-3 (HTLH) and J26F-4 (HTLC) on the fusing assembly side? Is the upper or lower thermistor in NO even contact with the upper/lower fusing roller? Is the upper or lower thermistor YES soiled? Action Check the wiring from connector J222 on the dc controller PCB to the upper thermistor; if it is normal, replace the fuser assembly. Check the wiring from connector J222 on the dc controller PCB to the lower thermistor; if it is normal, replace the fuser assembly. Check the upper fusing heater and thermal switch. Replace the fuser assembly if any problems are found. Check the lower fusing heater and the lower thermal switch. Replace the fuser assembly if any problems are found. Mount the thermistor properly. Clean the area of contact with the upper or lower fusing roller. EN Copy module troubleshooting 493