Seiko DPU-414 Service Manual page 17

(3) No interface communication.
[Condition]
Possible cause
Dipswitch setting error
Defective main board
[Condition]
Possible cause
Dipswitch setting error
Defective main board
(4) Paper can not be fed.
[Condition]
Possible cause
Defective drive voltage of the
paper feed motor
Attachment of alien
substances to the gears of the
paper feed motor
(5) Abnormal sound is emmited.
[Condition]
Possible cause
Attachment of alien
substances around the head
carrier
Awry FPC for head
[Condition]
Possible cause
Attachment of alien
substances to gears
concerned with the paper feed
The parallel communication does not operate.
Diagnostic method
Check the setting of the dipswitch
through the test print.
Check the l/O signals with an
oscilloscope.
The serial communication does not operate.
Diagnostic method
Check the setting of the dipswitch through
the test print.
Check the l/O signals with an oscilloscope.
The paper feed motor does not operate
Diagnostic method
Measure the voltage between motor
common and each phase with an
oscilloscope.
Visually inspect for substances around the
gears.
There is an abnormal sound when the thermal head is scanned.
Diagnostic method
Visually inspect around the head carrier for
alien substances.
Visually inspect the FPC for head for alien
substances.
There is an abnormal sound when the paper is fed.
Diagnostic method
Visually inspect the gear around for alien
substances.
CHAPTER 4 TROUBLESHOOTING
Judgement
and rating
Judgement
and rating
.
Judgement
and rating
4.88 ± 0.5 V
Judgement
and rating
Judgement
and rating
4-3
Recovery
Set the dipswitch
-
correctly.
- Replace the main board.
Recovery
- Set the dipswitch correctly.
- Replace the main board.
Recovery
Replace the main board.
- Remove alien substances.
Recovery
- Remove alien substances.
- Set the FPC correctly.
Recovery
- Remove alien substances.