Gasboy CFN Series Diagnostic Manual - Manual (Page 99)

Site Controller II
2210 3-35
Possible Cause Checks Corrective Action
Defective site controller power
supply or blown picofuse in
DC power cable. Measure the voltages
between the black (DC
ground) and orange (+5VDC),
black and red (+12VDC), and
black and white (-12VDC)
wires at connector P9 on the
Site Controller II CPU board If +5VDC is not measured at
P9, remove the DC power
cable and measure across
the orange wire between both
ends of the cable. Replace
the DC power cable if an
open circuit is measured.
Replace the power supply if
the orange wire is not "open".
Replace the power supply if
+12VDC and -12VDC are not
measured on P9.
Defective SC II CPU Board. None. Replace the SC II CPU
Board.
Defective SC II Memory
Board. None. Replace the SC II Memory
Board.
Changing the Fuse
1. Turn off the power and disconnect the AC power cord to allow access the fuse.
2. Reach under the lip where the fuse holder adjoins the power cable socket and use a small
blade screwdriver to pry the fuse holder out. The fuse is behind the fuse holder in an
exposed clip. There is a space for a spare fuse in the front of the fuse holder in an enclosed
holder.
3. Remove the bad fuse from the exposed clip and replace it with a new 2A 250 volt quick-blow
fuse (GASBOY P/N C08723). Use the spare fuse if available.
4. Slide the fuse holder back until it is flush with the back panel.
5. Reconnect power plug and turn on the power switch. After replacing a fuse, if the second
fuse also blows, then something is wrong. Contact GASBOY Technical Service for
assistance.
6. Reorder a new fuse to replace the spare, if necessary.