AMT Datasouth Accel-7350, Service Manual

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Trouble Symptoms
The lamp does not light and no display on LCD
Possible cause: Power cable is defective or loose. Power lines from the power switch are
disconnected. Loose connection between the main PCB and indicator PCB.
Loose connection on the Main PCB and power PCB. Fuse (F1) is blown. Power
PCB circuitry is defective. Main PCB circuitry is defective.
Remedy:
Replace defective parts and refer to the "Electric Repairs" section.
Incorrect LCD indication
Possible cause: Loose connector on the indicator PCB.
Main PCB circuitry is defective.
Remedy: Reinstall the connector properly or replace the Main PCB.
Home position detection error
Possible cause:
Head carrier malfunctions.
Defective sensor or interlock switch.
Remedy:
• Check if the head carrier smoothly moves across its carrier bar. If not, replace
the print head, head carrier, or carriage bar.
• Check the interlock switch and the connection of the connectors, CN28 on the
Main PCB.
RAM error
Possible cause:
Internal RAM error in CPU or external RAM error.
Remedy:
Replace the control PCB.
Improper carrier movement
Possible cause: Carrier runs along a bent carrier bar.C motor is defective. Timing belt is too
loose. Print head position is too close to the platen. Main PCB is defective.
Remedy:
Readjust the head position, repair/replace defective components, check motor
for mechanical problems, or check pulses from Main PCB.