Citizen CLP-621, Technical Manual

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4-2. Troubleshooting
4-9
CLP-621 & CLP-631
Symptoms Checks Remedies
Ribbon slants.
1. Is the ribbon correctly inserted into the
ribbon holders?
2. Is the ribbon path correct?
3. Is the ribbon slant elimination
adjustment made?
1. Insert the ribbon correctly.
2. Install the ribbon correctly.
3. Adjust it according to 3-6-2 “Ribbon
Slant Elimination Adjustment”.
4-2-5. Sensor Problems
Symptoms Checks Remedies
Head block is closed,
but head open error
is indicated by LEDs.
(Head up sensor
problem)
1. Is the Head Up Sensor Cable SA firmly
connected between the Head Up
Sensor PCB SA and the Main PCB SA
(CN9)?
2. Is the protrusion (metal end) inserted
into the photointerrupter of the Head Up
Sensor PCB SA?
3.
Failure in the control circuit.
1. Connect it firmly.
2. Replace the Head Up Sensor PCB
SA.
3. Replace the Main PCB Unit.
Ribbon tension is not
correctly controlled.
(Tension sensor F/R
problem) 1. Is the cable firmly connected between
the Sensor Tension SA on the take-up
side and the Ribbon Main PCB SA
(CN704)?
2.
Is the cable firmly connected between
the Sensor Tension SA on the supply
side and the Ribbon Main PCB SA
(CN705)?
3.
Is the tension value in the specified
range?
4.
Does the ribbon sensor F/R work
correctly?
Remove the ribbon, and push and
release the Ribbon Senor F/R Unit with
your finger tip to see if the LED of the
Tension Senor SA turns ON and OFF.
(Remove the Ribbon Tension
Adjustment Cover to see LED.)
5.
Failure in the control circuit.
1. Connect it firmly.
2. Connect it firmly.
3. Adjust tension according to 3-6-3
“Ribbon Tension Adjustment”.
4. Replace the Tension Sensor SA on
the take-up/supply side.
For the location of LED, see 3-6-3
“Ribbon Tension Adjustment”.
5. Replace the Ribbon Main PCB SA
or the Main PCB Unit.