Citizen CT-S651 Series

CT-S651 Series Service Manual
- 32 -
● Printing Failure
Phenomenon Cause Check Method Remedies
The control PCB is faulty.
−
Replace “SA, MAIN PCB”.
The thermal head connector
has a bad contact or
connection.
Check the contact or
connecting condition.
Re-insert the thermal head
connector or replace it with a
new one.
No printing
The thermal head is faulty.
−
Replace the thermal head with
a new one.
The thermal head connector
has a bad contact or
connection or faulty mounting.
Check the contact,
connecting or mounting
condition.
Re-insert the thermal head
connector or “HEAD SA”.
Part of printing is not
done.
The thermal head is faulty.
−
Replace the thermal head with
a new one.
The supply voltage is low. Check the supply voltage
with a tester.
Use the printer within the
specified supply voltage
range.
The thermal head is faulty.
−
Replace the thermal head with
a new one.
The thermal head has fouling. Check the thermal head for
fouling.
Remove fouling using ethyl
alcohol soaked cotton swab or
soft cloth.
Paper other than
recommended is used.
Check if the paper being
used meets the
specification.
Replace it with the specified
paper.
The platen roller is not
mounted correctly.
Check the mounting
condition of the platen roller.
Mount the platen roller
correctly.
Print is pale.
Print is uneven.
Print is faint.
The paper thickness setting
lever is not set correctly.
Check if the paper thickness
setting is correct for the
actual paper thickness.
Set the lever in the correct
position.