Gasboy 1000 Series FMS Diagnostic Manual - Manual (Page 106)

Troubleshooting
03/07/03 6-21 21
PUMP DISPENSES FUEL, PULSES NOT BEING COUNTED
Possible Cause Checks Corrective Action
No switch detect (reset
complete) signal from the
pump. Does switch detect LED on PC
PCB light?
Using an AC voltmeter,
measure across the switch
detect terminal block in the
Series 1000 post. Is 115VAC
measured when reset is
complete?
Switch detect is OK if PC PCB
LED lights.
Repair or replace electric reset
motor or repair wiring between
electric reset motor and Series
1000 if 115VAC is not
measured.
Switch detect signal not
acknowledged by PC PCB. Connect pump simulator to
suspect pump position on PC
PCB. Turn on switch detect
switch of simulator. Does
switch detect LED on PC PCB
light? Replace PC PCB if switch
detect LED does not light.
Repair cabling or examine
connection of cabling between
switch detect terminal block in
Series 1000 post and PC PCB.
Pulse signals not
acknowledged by PC PCB or
MPU PCB. Examine pulse LED on PC
PCB while dispensing fuel
slowly. Does pulse LED blink
with each pulse?
Connect pump simulator to
suspect pump position on PC
PCB. Press the pulse button
repeatedly. Does the pulse
LED on the PC PCB blink with
each press of the pulse
button?
Replace PC PCB if the pulse
LED is blinking with each
pulse but not recording
quantity.
Replace the MPU PCB if pulse
LED is blinking with each
pulse and changing PC PCB
did not correct problem.
Replace the PC PCB if the
pulse LED does not blink with
each press of the pulse button.
No pulse signals from the
pump. Examine the pulser while
dispensing fuel. Is the pulser
shaft turning? Repair the pulser linkage
(cotter pin) if the pulser shaft
does not turn.
No pulse signals from the
pump. Disconnect the pulser at the
DC junction box. Authorize
the pump and do a tap test. In
reed pulser wiring, simply tap
the two wires together. In
electronic pulser wiring, tap
the DC ground wire and pulse
wire together. Check if pulses
are recorded. Repair the pulser wiring if
pulses are not recorded.
Check for shorts or opens.
Replace the pulser if pulses
are recorded.