Gasboy 1000 Series FMS Diagnostic Manual - Manual (Page 114)

Troubleshooting
03/07/03 6-29 29
Portion of printed characters is missing.
Possible Cause Checks Corrective Action
Ink ribbon is not installed
properly, is worn out or dry. Examine the installation of the
ribbon. If it is correct, examine
the ribbon for wear, dryness,
tears, or holes. Re-install the ribbon or replace
it if necessary.
Printer mechanism may have
a defective print head,
improper head clearance, or
may be running at improper
print speed. Replace the printer
mechanism.
Defective print head solenoid
drivers. Replace the Star Controller
PCB if replacing the printer
mechanism didn't correct the
problem.
Paper low lamp is lit.
Possible Cause Checks Corrective Action
Receipt printer is actually low
on paper. Check the amount of
remaining paper. Replace the paper if it is low.
Defective paper low sense
switch. Check if switch roller arm is
bent or broken.
Using a DC voltmeter,
measure across the wires to
the switch. With switch
pressed, +12VDC should be
measured; with switch open,
0VDC should be measured.
Replace switch if it is
mechanically or electrically
defective.
NOTE: Once the paper low
lamp comes on, it will not go
off unless paper out is reached
and then refilled, or the MPU
PCB is reset.
Incorrect switch selection on
the MPU PCB. Switch positions 5 through 8 of
the MPU PCB dip switch
should be open. Open switch positions 5
through 8 if they are closed.
Press the reset switch on the
MPU PCB after changing
switch positions.
Defective switch sense IC or
lamp driver on the Auxiliary
Communications Port PCB. Using a DC voltmeter,
measure pin 4 of U11 on the
Auxiliary Communications Port
PCB. +5VDC should be
measured if paper is not low. Replace the Auxiliary
Communications Port PCB if
0VDC is measured at U11 pin
4 and paper is not actually low.
Defective MPU PCB. Replace the MPU PCB if
replacing the Auxiliary
Communications Port PCB did
not correct the problem.