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Troubleshooting 4-84
NovaJet 800 Series Service Manual
reading that was sampled when the detected error occurred.
Failure Analysis
1. Ensure all logic cable and power cable connections are intact.
2. Check lower leg harness cable plug connections between right
stand leg and platen plug, and connection between upper leg
harness cable and Main PWA. Perform electrical pin-out to verify
continuity of cables (refer to service manual). Typically for wiring
harness and dryer logic cable problems the Dryer will be forced
into the Disabled mode and Plenum Temperature (Plenum T) will
change to approx. –43C and display a Hardware Fault (Hdw.
Fault).
3. Replace the Main PWA (the humidity sensor and temperature I/C
are attached to backside of Main PWA). Refer to Disassembly.
4. Replace the Dryer Assembly.
Note: There is a particular sequence of events that could result in a
disabled dryer. Please be aware that this condition could occur and is
recoverable. The dryer and printer are operating as designed. The
sequence of events are:
1. The Printer has been on and DRYER ON or AUTO for some period
of time.
2. The printer is turned OFF.
3. The printer is immediately turned ON.
4. As the Firmware is being initialized power is applied to already
warm heating elements.
5. The temperature in the plenum rises to the Firmware shutoff point
but since the Firmware is still initializing no action can be taken.
6. The temperature in the plenum triggers a hardware shutdown (the
electronics shuts down power to the heating elements and the
fans are forced on).