20
SERVICE (cont.)
CONTROL BOARD (IMIX-3S+ & 5S+ only)
FIG. 13 CONTROL BOARD
P3250.25
Location:
The Control Board is located behind the lower front
access cover mounted on the component bracket.
Test Procedure:
Liquid Level Control Circuitry:
1. Disconnect the dispenser from the power source.
2. With a voltmeter check the voltage across pins 4
& 5 of the J5 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 check the voltage across pins 15
& 16 of the J4 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.
42032 060109
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.
6. Gently pull the liquid level probe out of the tank lid
and inspect for corrosion. Replace it if necessary.
7. Place the probe so that neither end is in contact
with any metal surface of the dispenser.
If the voltage is present as described, re-install the
probe. The liquid level control circuitry is operating
properly.
If the voltage is not present as described, check the
pink probe wire and green tank wire for continuity and
overflow protection switch.
8. Check that the “Rinse/Run” switch is in the “Run”
position.
9. With a voltmeter check the voltage across the red
(+) terminal and the black (-) terminal of the auger
motor. Connect the dispenser to the power source.
Press the appropriate dispense switch. After a
delay of about .6 seconds, the indication must be
b4.0 and +24.5 volts dc.
If the voltage is present as described, the hopper motor
control circuitry is operating properly.
If the voltage is not present as described, replace the
control circuit board.
Summary of Contents for IMIX
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