Citizen CL-S6621 Technical Manual page 150

Symptoms
Ribbon is not fed at
all, or is not fed
correctly.
Ribbon slants.
Checks
6. Does the ribbon cooling fan work
correctly for cooling the ribbon motors?
If not, check if the cable of the "SA,
Fan" is firmly connected to the "SA,
Ribbon PCB" (J106).
Note:
The fan does not turn all the time. It
turns when the temperature of the "SA
Ribbon Motor F" on the front side
exceeds a certain value.
7. Do the ribbon sensors on the front and
rear sides work correctly?
See "4-2-5 Sensor Problems".
8. Do the ribbon drive gears work
correctly?
9. Does the "SA Ribbon Motor F"/"SA
Ribbon Motor R" work correctly?
10. Failure in the ribbon motor drive circuit.
11. Failure in the ribbon motor control
circuit.
1. Is the ribbon correctly inserted into the
ribbon holders?
2. Is the ribbon path correct?
3. Is the ribbon slant elimination
adjustment made?
6. Connect the cable firmly.
7. Replace the "SA, Ribbon Sensor"
on the front/rear side.
8. Replace a defective ribbon gear.
9. Replace the "SA Ribbon Motor F"/
"SA Ribbon Motor R".
10. Replace the "SA, Ribbon PCB".
11. Replace the "SA, Main PCB".
1. Insert the ribbon correctly.
2. Install the ribbon correctly.
3. Adjust it according to
Slant Elimination
4-9
Troubleshooting
Remedies
"3-7-2 Ribbon
Adjustment".
CL-S6621