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SERVICE (cont.)
CONTROL BOARD (FMD-2,-2FD,DBC-2FD,DBC-3)
FIG. 10 CONTROL BOARD
Location:
The Control Board is located behind the lower front
access cover mounted on the component bracket.
Test Procedure:
Power Supply:
1. Disconnect the dispenser from the power source.
2. With a voltmeter, back probe check the voltage
across pins 1 & 2 of the eight pin J1 connector
on the wiring harness. Connect the dispenser to
the power source. The indication must be 24 volts
ac.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 4.
If voltage is not present as described, refer to the wiring
diagram and check the dispenser wiring harness back
to the transformer.
4. With a voltmeter, back probe check the voltage
across pins 2 & 4 of the six pin J2 connector on
the wiring harness. Connect the dispenser to the
power source. The indication must be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 volt models
or three wire 120/240 volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
5. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 6.
If voltage is not present as described, refer to the wiring
diagram and check the dispenser wiring harness back
to the power cord.
Liquid Level Control Circuitry
6. Carefully connect a piece of insulated jumper wire
to pin 3 (third from left on top row) of J1 on the
control board. Keep the other end of this wire away
from any metal surfaces of the dispenser.
7. With a voltmeter check the voltage across the
terminals of the inlet solenoid valve. Connect the
dispenser to the power source. After a 10 second
delay, the indication must be :
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 or 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
8. Touch the free end of the jumper wire to the dis-
penser housing. The indication must be 0.
If voltage is present as described, proceed to step 9.
If the voltage is not present as described, replace the
control circuit board.
NOTE: Verify the ground wire is connected to the board
mounting stud before replacing the control board.
9. Gently pull the liquid level probe out of the tank lid
and inspect for corrosion. Replace it if necessary.
10. Place the probe so that neither end is in contact
with any metal surface of the dispenser.
P4102.40
FMD DBC-3 shown
42672 122209