8. TROUBLESHOOTING USING PCB 12 VOLT (GREEN), MOTOR OVER CURRENT (YELLOW),
AND MOTOR (RED) DIAGNOSTIC LIGHTS
The red LED indicates that the transformer, circuit breaker and the basic DC power supply system is
operative. This unregulated DC voltage of 18V-22V is used for the pump motor voltage and the input to
the +12VDC regulator on the main control PCB.
The green LED indicates the output of the 12 VDC regulator is normal. This voltage is used for all
solenoids and the PCB circuits. The 12V regulator can
SHUT DOWN
from excess current or excess
temperature but will automatically start operating again when the problem is removed. An example
would be a shorted left dispense solenoid coil. The green LED would be on until the left paddle was
depressed, which would cause the green LED to go
OUT
until the paddle was released. Left flush, right
flush, and right dispense would be normal and the green LED would be
ON
before and during dispense.
The yellow LED indicates a motor over current condition when lighted. This could be caused by a faulty
motor, pump or a grounded motor lead. Normally, the yellow LED will flash
ON
the instant a paddle is
pushed, then go
OUT
immediately. This is caused by a high in-rush current to get the motor initially
started.
The following are some typical diagnostic light conditions and the possible problems associated with
these conditions. All conditions are with the key switch in the
ON
position and the power cord plugged
in.
LIGHTS
STATUS
PROBLEM
GREEN YELLOW
RED
ON
OFF
ON
Key switch ON.
Normal operations.
OFF
OFF
ON
Key switch ON. Not
1. Wiring short of +12 Volts to ground.
trying to dispense
2. Defective control PCB.
product.
ON
OFF
OFF
Key switch ON. Not
Defective control PCB.
trying to dispense
product.
OFF
OFF
OFF
Key switch ON. Not
1. Defective transformer or control box.
trying to dispense
2. Breaker tripped on front panel.
product.
3. Transformer wiring harness not
connected to control PCB.
OFF
OFF
ON
Key switch ON, trying
Shorted (defective) solenoid.
to dispense product or
flush. Green ON when
not trying to dispense.
ON
OFF
OFF
Key switch ON, trying
Defective PCB.
to dispense product.
ON
OFF
ON
Key switch ON, trying
1. Wiring harness not connected to
to dispense product but
pump support.
concentrate pump does
2. Defective PCB.
not operate. Water
`
does dispense.
ON
ON
ON
Key switch ON, trying
1. Defective or overloaded pump
to dispense product
or motor.
but concentrate pump
2. Shorted motor connector.
does not operate.
3. Short in wiring harness.
Water does dispense.
20
Summary of Contents for CENTURION II 85-0056
Page 28: ...11 ILLUSTRATIONS PARTS LISTINGS AND WIRING DIAGRAMS 11 1 CENTURION II FINAL ASSEMBLY 24 ...
Page 30: ...26 11 2 CENTURION II PUMP REGULATOR ASSEMBLY ...
Page 32: ...11 3 CENTURION II WATER CONCENTRATE COMPONENT ASSEMBLY 28 ...
Page 34: ...30 11 4 CENTURION II REFRIGERATION ASSEMBLY ...
