Kodak 800 SERIES service manual Paper Sensor

NovaJet 800 Series Service Manual

Figure 4-69. Paper Sensor.

Initialization Failure

One symptom of a defective paper sensor is when the carriage assembly suddenly stops at left end of unit during initialization - initialization does not complete (dim or blank control panel display). This could also be due to a faulty power supply. The paper sensor should sense the platen on the return trip but may fail to do so - no error code given. Replace paper sensor PCB on carriage in this situation, unless the power supply is proven defective first.

NOTE: it is extremely important that the room or area lighting remains consistent during all print operations or the paper sensor may fail (often no error message is provided - the printer simply stops the print job; i.e., do not turn lights off in the room after a printer has successfully mea- sured the media, and then start a print job).

Ensure the Main PWA LEDs (light emitting diodes) are properly function- ing:

D1 – Normally flashes; DSP is not active. Steady when printing.

D9 – Normally flashes; Power PC processor is idle. Stops flashing when processor is active (i.e. during paper sensing operations).

D10 – Normally OFF; Flashes during initialization, then turns off. LED staying on would indicate a problem when the FPGA is unconfigured. Ensures programming of gate array chips is successful.

D8 - +24V available.

D13 - +5V available.

Troubleshooting 4-66