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Phenomenon 15.
The ribbon winds but becomes loose.
Is printing paper
within standards?
YES
NO
Does ribbon
feed
correctly?
NO
YES
Is clearance between
tip of print head and
platen correct?
NO
Is clearance correct after
NO
adjusting with head
adjust lever?
Phenomenon 16.
Go/return time for the carriage varies.
Does carriage move
smoothly by hand?
YES
NO
Do phase of HP signal
NO
and PTS signal match?
t - - - - - - - c
•
Practical Method of Repair
Check
Phenomenon 2.
Repair 1
PTS signal is bad, HP signal is bad
(1) Check points and method
1) Check
+5V.
[Standard] +5V
±5%
2) Test wheth
er
LEDs are normal or
not.
,-
1
I
I
I
I
PTS
sensor
~,__
-
----
-
---,
I
<
PTS
signal
I
I
I
- -
-
__j
YES
5
~o
I
_ _ _ j
-
50-
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