Citizen CT-S4000 Service Manual page 15

• Printing failure
Phenomenon
No printing
Partly not printed
Faint printout or uneven
printout
Cause
Faulty control PCB assy
Failed contact/connection
of thermal head
connector
Faulty thermal head
Faulty contact/connection
in thermal head
connector
Faulty thermal head
Low output voltage
Faulty thermal head
Foreign substance is
adhered to the thermal
head.
Non-recommended
paper is used.
Faulty mounting of the
platen roller
Check Method
—
Check
contact/connection
condition.
—
Check contact/conection
conditions.
—
Check the supply voltage
with tester or others.
—
Check whether any
foreign substances are
adhered to the head.
Check whether the paper
being used meets the
specification.
Check mounting
condition of the platen
roller.
15
CT-S4000 Service Manual
Remedy
Replace the control PCB
assy.
Re-insert thermal head
connector.
Replace the thermal
head.
Re-insert thermal head
connector.
Replace the thermal
head.
Use within specified
voltage range.
Replace the thermal
head.
Wipe foreign materials
with swab or soft cloth
immersed with ethyl
alcohol.
Replace it with the
specified paper.
Mount the platen roller
properly.