
Rev. A Troubleshooting Guide 4-7
TM-T88 Series Technical Manual
Does not work
at all?
Output voltage of
regulator circuit on
main circuit board
within specified
range? (*2)
Cover closed?
Yes it prints, but results are abnormal.
Yes
5 Self-test does not work correctly.
Replace thermal head.
No
Replace main circuit board.
END
Not at all
No
Close cover correctly.
Operation OK?
No
Yes
Yes
END
Roll paper cover sensor
set conducting OK?(*1)
Yes
SW1 of switch circuit
board unit
conducting OK?
Yes
Yes
Replace mechanism set.
END
No
Operation OK?
Yes
END
Replace roll paper
cover sensor.
No
No
Operation OK?
Yes
END
Replace switch
circuit board unit.
No
No
Operation OK?
Yes
END
Replace main circuit board.
No
(*1) Check for following voltage values at
Pin 15 of connector CN1 on switch
circuit board :
Cover closed: 0V
Cover open: 5V
(*2) Check for following voltage values at
specified checkpoints.
Checkpoint Specified value
C42 + terminal +5V ± 0.5V
C39 + terminal + 24V ± 5%
5
END
Operation OK?
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