Gasboy CFN Series Diagnostic Manual - Manual (Page 51)

Site Controller I
0021 2-25
Possible Cause Checks Corrective Action
Defective site controller power
supply or power supply cable. Measure the voltages
between the black (DC
ground) and orange (+5VDC),
black and red (+12VDC), and
black and white (-12VDC),
wires at connector P8 on the
site controller CPU Board If the +12 VDC or -12VDC
voltages are not present,
replace the power supply. If
+5VDC is not present,
measure the continuity of the
orange wire using an
ohmmeter. If an open circuit
is measured between both
ends of the orange wire,
replace the DC power cable
and recheck the voltages. If
+5VDC is still not present at
P8, replace the power supply.
Defective site controller CPU
PCB. None. If the proper voltages are
measured at the P8
connector but the site
controller doesn't power up,
replace the CPU board.
Defective Memory PCB. Replace the Memory board if
replacing the CPU board
didn't correct the problem.