Gasboy 1000 Series FMS Diagnostic Manual - Manual (Page 115)

GASBOY Series 1000
6-30 03/07/03
Paper low lamp never lights.
Possible Cause Checks Corrective Action
Bulb is burnt out. Pull bulb and check filament.
If there is no bulb to check,
replace C09682. Replace bulb if it is burnt out.
Defective paper low sense
switch. 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.
Defective switch sense IC or
lamp driver on the Auxiliary
Communications Port PCB. Using a DC voltmeter,
measure U11 pin 4 of the
Auxiliary Communications Port
PCB. A low level 0VDC
should be measured if paper is
low. Replace Auxiliary
Communications Port PCB if
+5VDC is measured at U11
pin 4 and paper is actually low.
Replace Auxiliary
Communications Port PCB if
+5VDC is measured at U13
pin 3 when the paper low lamp
should be lit.
Defective MPU PCB. Replace the MPU PCB if
replacing the Auxiliary
Communications Port PCB did
not correct problem.