Gasboy CFN Series Diagnostic Manual - Manual (Page 228)

GASBOY CFN Series
6-38 12/26/02
Possible Cause Checks Corrective Action
No pulser power to Veeder
Root Model 7874
Pulser/Totalizer (if used). Measure between the + and -
terminals on the VR Totalizer
Power bracket in the PPC.
Measure between the -
terminal and both sides of F1
on the VR Pulser Power PCB.
If +70 and 125VDC is
measured between the + and
- terminals, go to "Defective
PPC I/O Board."
Replace F1 if +70 and
125VDC is only measured on
one side. Replace the VR
Pulser Power PCB if +70 and
125VDC is not measured on
either side of F1.
Defective PPC I/O board. Remove the pulser wires from
the TBP (P3) pulser
connector on the PPC I/O
board. Strip about 1/4" of
insulation from both ends of a
6" piece of wire. Install one
end into terminal G. Turn the
P screw all the way down.
Slowly tap the free end of the
wire onto the P terminal. The
pulser LED should flash on
and off. If the pulser LED doesn't flash
on and off during this tap test,
replace the PPC I/O board.
Defective PPC CPU board. Activate the pump and turn
the pump handle on. After
the pump resets, do the tap
test again. Turn the pump
handle off. If the transaction didn't record
quantity, replace the PPC
CPU board.
Wiring problem between PCU
and pump. Install the pulser wiring that
was removed in the steps
above. Check the pulser
signal and power wires
between the PCU and pump Repair any opens, shorts, or
crossed wires.
No pulses from pump. Check if the pulser shaft
turns. If the computer turns but the
pulser shaft doesn't, check
and repair the linkage.
In the pump DC junction box,
disconnect the pump pulser
and connect a new pulser.
Activate the pump and spin
the new pulser by hand. If the
system now records pulses,
install the new pulser
permanently.