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Troubleshooting 4-75
NovaJet 800 Series Service Manual
or less at power up and results with a ‘carriage axis error’ or if
operation is intermittent with failures. Servo motor power can be
checked by assisting carriage head movement with one hand
(gently help push the carriage assembly along; if successful, the
servo motor is defective. Refer to disassembly.
14. Replace encoder sensor if the encoder strip was noted as being
extremely dirty and/or carriage head does not move at all during
printer power up. Refer to disassembly.
15. Replace the right carriage PWA (defective encoder sensor jack or
trailing cable jack). Refer to disassembly.
Initialization Failure
SYMPTOM: PRINTER DOES NOT INITIALIZE AFTER THE
POWER SWITCH IS TURNED ON.
Note: there is no carriage head movement for the failure analysis below.
If there is carriage movement prior to the initialization failure then please
refer to ‘Carriage Axis Failure’ troubleshooting procedures.
Failure Analysis:
1. Ensure the power source from wall outlet or power strip is good.
Figure 4-77. Boot ROM Access Function.
2. While holding the top-left and bottom-left keypad switches, turn on
the power switch. A “double beeping” should be heard from printer.
This will verify the initialization code (BootROM) is running
properly; printer is in a continuous run state. Reseat all cable
connections if this test fails, then repeat step again. Download
BootROM and Firmware in this configuration. Power off printer,
wait 10 seconds, reapply power to printer. Check operations.