3-4 Phaser 8400/8500/8550 Color PrinterPOST Error ReportingPOST checks the communication paths within the electronics module and to othervarious printer components.POST testing initializes the Control Panel, and in most cases if an error occurs, a textmessage is displayed on the Control Panel along with an LED blink code flashing onall three LEDs (Control Panel LED, PS LED and PE LED). If initialization of theControl Panel fails, POST errors will still report using the LED blink patterns. Thesum of the flashes equal the error code. If the code has more than 5 flashes, there is abrief pause between each set of 5 flashes to make them easier to count. After allflashes occur within the code, there is a long pause and then the flash pattern repeats.“Soft” POST errors, that do not prevent the printer from powering up completely, aredisplayed on the Control Panel for 5 seconds, and then the printer continues throughthe remainder of POST. There are no rear panel LED codes associated with softerrors. Most soft errors will cause the printer to print a Startup Page with the errormessage on it.NoteBefore replacing the electronics module for any POST errors, do thefollowing:1. Unplug all wiring and/or cables to the electronics module.2. Plug in the AC power cable and power on the printer electronics module.3. If the error blink pattern is now different from the original error reported beforeStep 1, the problem may not be in the electronics module, (see "MiscellaneousElectrical Troubleshooting" on page 4-65).3 RapidblinkingPrinter hangs during code initialization.1. Unplug all cables from the electronics module.2. Plug in the power cable.3. Power on the electronics module (system).4. If the problem still occurs, reseat the RAM DIMMs.5. Replace the electronics module. For disassembly, see"Electronics Module" on page 8-55. For replacement, go tothe Parts List on page 9-3.BIST Error Reporting Blink Pattern Definition Table (Continued)PE LED PS LED Description
