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Models C708/C709/C716/C717
Troubleshooting
C708/C709 Electrical Troubleshooting Guide
Power Cord Plugged In/Power Switch in the
OFF Position
L1 power from the power cord connection travels
through the EMI filter to the 16 volt transformer. The
transformer supplies 16 vac to terminals A and B on
the interface board.
The interface board sends 5 vdc to terminal J1 on
the universal board.
Power Switch in the ON Position
L1 power from the power cord connection is
supplied to the terminals marked L1 on the interface
board. To supply power to the L1 terminal on the
interface board, L1 travels through the following
switches: the power switch, the beater motor
overload switch, the compressor high limit switch
and the 15 amp. fuse.
Power Switch in the ON Position/Mode
Select: WASH
With L1 power supplied to the L1 terminal of the
interface board, power is supplied through pin 7 of
the J6 terminal, beater interlock relay and to the
beater motor contactor coil.
Power Switch in the ON Position/Mode
Select: PUMP
With L1 power supplied to the L1 terminal of the
interface board, power is supplied through pin 5 of
the J6 terminal to the air/mix pump motor overload
and then to the air/mix pump motor.
Power Switch in the ON Position/Mode
Select: AUTO
Power is sent from the L1 terminal of the interface
board through the following pins on the J6 terminal:
7 for the beater motor contactor coil
6 for the condenser fan
5 for the air mix pump (30 seconds only)
4 for the barrel suction solenoid
3 for the hopper liquid solenoid and hot gas bypass
(DBV)
2 for the barrel liquid solenoid
1 for the compressor contactor coil
To operate the agitator, L1 is supplied to the agitator
motor power transformer (24V) from the power
switch. The transformer supplies power to terminal
J5, pin 1 of the interface board. From pin 1, power is
supplied through the following pin:
4 for agitator motor
Power Switch in the ON Position/Mode
Select: AUTO/Draw Switch Activated
Power is sent from the L1 terminal on the interface
board through the following pins on the J6 terminal:
7 for the beater motor contactor coil
6 for the condenser fan
5 for the air/mix pump (The pump runs for 10
seconds after the draw handle is closed.)
4 for the suction solenoid
2 for the barrel liquid solenoid
1 for the compressor contactor coil
At the completion of a draw, the beater motor and
compressor are cycled off by the personality board
amp. monitor.
Power Switch in the ON Position/Mode
Select: AUTO/Heat Cycle Activated
Power is sent from the L1 terminal on the interface
board through the following pins of the J6 terminal:
7 - Beater Motor
6 - Condenser Fan
4 - Refrigeration Evaporator Suction Solenoid
1 - Main Refrigeration Compressor Contactor Coil
L1 is supplied to the power transformer (24 vac)
from the power switch. The transformer supplies
power to terminal J5, pin 1 of the interface board.
From pin 1, power is supplied through the following
pins:
6 - Barrel Hot Gas Solenoid Relay
5 - Hopper Hot Gas Solenoid Relay
4 - Agitator Motor
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