HP 8550 Service Manual - Page 499
E019 printer, printer operation, the light-receiving cell of the waste toner sensor
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Page 499 highlights
E019 (printer) At the time of power-on or while the drum motor is rotating during printer operation, the light-receiving cell of the waste toner sensor does not detect light for a specific time even when the waste toner case is not full. Cause Waste toner detection window Connectors Step 1 2 Waste toner 3 detecting block (light-emitting/ receiving section; printer unit) Waste toner 4 detection block (printer unit) Checks Y/N Is the waste toner detection YES window of the photosensitive drum soiled? Are connector J21 on the dc NO controller PCB, connectors J631 and J633 of the waste toner sensor, and the relay connector J71 connected securely? Is the light-emitting/receiving section of the waste toner detection block of the printer unit soiled? YES Replace the waste toner detection YES block of the printer unit. Is the NO problem corrected? Action Wipe the waste toner detection window with a dry cloth. Connect the connectors securely. Dry-wipe the light-emitting/ receiving section of the waste toner detection block with a dry cloth. End. Replace the photosensitive drum unit. If the problem cannot be corrected, replace the dc controller PCB. EN Copy module troubleshooting 497