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Troubleshooting 4-77
NovaJet 800 Series Service Manual
3. Remove power from the printer. Ensure the memory module
(DIMM - dual-in-line memory module) at the Main PWA is seated
properly. There must be installed memory for the printer to
initialize. The top and right cover assemblies must be removed to
access the Main PWA (remove 5 screws to gain access).
Replace the memory module to verify memory is not the cause of
failure. Refer to disassembly.
4. Refresh the printer firmware during the cyclical “two-beep”
sequence from step 2 above if successful. Cycle power and
retest. Call technical support if unfamiliar with this procedure.
5. Check the AC power entry module continuity and switch operation.
Ensure plug between power supply and power entry module is
intact and connected properly. Caution: even with the power
switch in the off position AC power is still being applied to the
dryer plenum. Refer to Disassembly.
6. Verify the fuse at the Power supply is good (0.5 ohms or less).
Verify the wire plugs at power supply jack on the Main PWA are
properly connected with the plug. Retest.
7. Check power supply output voltages to Main PWA using a digital
voltmeter or hand held voltage meter. Select DC measuring scale.
Ensure Main PWA LEDs are displaying:
D8 - +24V available.
D13 - +5V available.
Replace the power supply if the +5VDC or +24VDC levels are
absent from power supply output. Verify the power source is
isolated prior to checking output and also check for grounding of
+24VDC signal lines. If all voltages are absent replace the power
supply. If only one voltage is absent then replace Power supply.
Refer to Disassembly.