Gasboy CFN Series Diagnostic Manual - Manual (Page 307)

Standalone Receipt Printer
0021 8-15
Portion of printed characters is missing.
Possible Cause Checks Corrective Action
Ribbon is not installed
properly or is worn out or dry. Check that the ribbon is
installed properly. The ribbon
must not have any holes or
tears Re-install the ribbon and
replace if necessary.
Defective print head,
improper head clearance,
improper print speed. EPSON: None
STAR: Self-test or check
head adjust lever position. EPSON: Replace receipt
printer mechanism.
STAR: Push the lever as far
as possible towards the rear
and pull it two notches
forward (standard position). If
no good, replace the unit.
Defective head solenoid
drivers. EPSON: None.
STAR: Self-test. EPSON: Replace the CPU
board if replacing the receipt
printer mechanism didn't fix
problem.
STAR: Replace unit.
EPSON ONLY: Paper doesn't advance when printing receipts or when paper advance
switch is pressed.
Possible Cause Checks Corrective Action
No +24VDC. Measure +24VDC between
the brown (gnd) and gray
(+24) wires. Replace printer if no +24VDC.
Defective Epson receipt
printer CPU board. Using an oscilloscope,
measure the signal at pin 19
on the flexible printed circuit
connector while pressing the
paper advance switch. Replace the Epson receipt
printer CPU board if a 24VDC
square wave is not seen at
pin 19.
Defective clutch mechanism
or clutch solenoid. Using an oscilloscope,
measure the signal at pin 19
on the flexible printed circuit
connector while pressing the
paper advance switch. Replace the receipt printer
mechanism if a 24VDC
square wave is seen at pin 19
and paper still doesn't
advance.