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IV. MALFUNCTION TROUBLESHOOTING
IV-1 No AC power
< possible causes >
1. The POWER ON signal is not input because of the poor contact in the interface connector.
Action: Reconnect the interface connector correctly.
2. Power switch failure
Action: Remove the power supply unit, and put the tester between the power switch termi-
nals. Replace the power supply unit, if it is not 0V when the switch is turned ON
or it is not infinity Ohm when the switch is turned OFF.
3. Bown fuse
Action: Remove the power supply unit and replace the fuse.
4. Over-current/over-voltage detection circuit triggers
Action: Disconnect the power connector and reconnect it. If the problem persists, investi-
gate the factor that activates the over-current/over-voltage detection circuit. Turn
the power switch ON at least two minutes after the power switch is turned OFF.
5. Power supply unit failure
Action: Turn OFF the printer. Disconnect the connector J203 on the paper deck driver
PCB.
Turn ON the paper deck, and measure the DC power supply output of the connec-
tor J203 on the cable.
Make sure not to short the connector.
Replace the power supply unit, if the specified value is not output.
6. Wiring, DC load, and paper deck driver PCB
Action: Turn the printer OFF, and check the wires and DC loads connected between the
paper deck driver PCB and other units. Replace the paper deck driver PCB if the
wires and DC loads have no problem.
IV-2 Paper deck drive motor failure
< possible causes >
1. Poor contact in the DRIVE MOTOR DRIVE signal line connector.
Action: Reconnect the connector J205 on the paper deck driver and the drive motor con-
nector J301.
2. Paper deck drive motor failure
Action: Replace the paper deck drive motor.
3. Paper deck driver PCB failure.
Action: Replace the paper deck driver PCB.
IV-3 Paper feed motor failure
< possible causes >
1. Poor contact in the FEED MOTOR DRIVE signal line connector.
Action: Reconnect the feed motor connector J302 and the connector J206 on the paper
CHAPTER 4
4 - 13
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Table of Contents
Troubleshooting
