UBI EasyCoder 601 XP – Service Manual Ed. 1
148
Chapter 17 Troubleshooting
Description:
Paper feed does not work properly.
Possible Causes and Suggested Remedies:
• No hardware lock electronic key fitted in P34.
- If no electronic key is fitted in P34, the printer will still respond
to commands and perform must UBI Fingerprint operations,
but the motors will not run, which prevents any printing. Fit a
correct electronic key in P34.
• Faulty stepper motor.
- Connect a working stepper motor, e.g. the one in the optional
paper rewind unit, to P420 and perform a PRINTFEED or
FORMFEED operation. If this motor runs, the original paper
feed stepper motor is probably damaged.
• Dirty or worn pressing roller.
- Inspect the pressing roller for visible wear. Replace if neces-
sary (see chapter 8.2).
- Clean the pressing roller using a cleaning card or a soft cloth
moistened with isopropyl alcohol. Paper dust or adhesive
residue can deteriorate the paper feed function or make the
paper slip.
• Wrong belt tension.
- Check the tension of toothed belt that drives the pressing roller
and adjust as explained in chapter 8.5.
• UBI Fingerprint instruction missing.
- Verify that a print command is actually issued in the current
UBI Fingerprint program.
• CPU board malfunction or bad connection.
- Move the cable from P420 to P421 on the CPU board and
perform a PRINTFEED or FORMFEED. If the stepper motor
works now, the problem is probably on the CPU board.
- The paper feed stepper motor could be incorrectly connected
(P420), or its drive circuits, IC422 and IC423 on the CPU
board could be damaged.
- Check that all pins in the connector of the stepper motor's
cable are fully inserted.
• Power supply malfunction.
- Check the voltage on test point V40 on the CPU board, see
chapter 15.5. If V40 is not +42V
±
10%, the power supply unit
is probably faulty.
17.12 Printing Troubles,
cont'd.
