Control Board Layout And Summary Table; Main Control Board Summary; Main Control Board Layout - Sub-Zero 424HAG/O-2 Service Manual

Electronic Control System
MODEL 427-2 REFRIGERATOR SECTION

CONTROL BOARD LAYOUT AND SUMMARY TABLE

Electrical connection points on the control board are labeled alphanumerically. These labels correspond with the
alphanumeric summary table, located on the wiring diagram. By referencing the summary table, it is possible to
identify which components are connected at which points on the main control board. Below is a layout diagram of
the control board, and a copy of the summary table. (See Figures 3-43 & 3-44)
NOTE: All components on the control board are non-replaceable. If a problem with the control board is identified,
the complete control board must be replaced.
NOTE: There is also a small PC board in the control panel assembly (Not Shown). All components in the control
panel assembly are non-replaceable. If a problem with the control panel is identified, the complete control panel
assembly must be replaced.
TERMINAL
120 VOLT CIRCUITS
P4
P3
P1
COMPRESSOR
P2
J3-1
J3-2
J3-3
J3-4
J3-5
J3-6
J3-7
J2-1
J2-2
J2-3
J2-4
LOW VOLTAGE THERMISTOR CIRCUITS
J5-1,2
J5-3,4
J5-5,6
J5-7
J5-8
J6-1
J6-2
J6-3
J4-1
J4-2
J4-3
J4-4
J4-5
J4-6
#3758410 - Revision C - May, 2014
MAIN
BOARD
Figure 3-43. Main Control Board Layout

MAIN CONTROL BOARD SUMMARY

CIRCUIT DESCRIPTION
NEUTRAL
LN
POWER IN
L1
COMPRESSOR
DEFROST HEATER
DEFROST
EVAPORATOR FAN
FAN 1
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
LIGHTS
LIGHTS
NOT USED
UPR DRAWER LIGHT SENSE
NOT USED
NOT USED
NOT USED
UPPER
REFRIGERATOR COMPARTMENT
EVAPORATOR
EVAP
EVAPORATOR
EVAP
NOT USED
NOT USED
NOT USED
DISPLAY WIRING
DISPLAY
DISPLAY WIRING
DISPLAY
DISPLAY WIRING
DISPLAY
DISPLAY WIRING
DISPLAY
DISPLAY WIRING
DISPLAY
DISPLAY WIRING
DISPLAY
Figure 3-44. Control Board Summary Table
Wine Storage
Wine Storage
FUNCTION
NEUTRAL INTO BOARD
POWER INTO BOARD
POWERS COMPRESSOR AND CONDENSER FAN
POWERS DEFROST CIRCUIT AND FILL TUBE HEATER
POWERS EVAPORATOR FAN
POWERS LIGHTS
SENSES IF DRAWER OPEN
SENSES REFER CABINET TEMPERATURE
SENSES EVAPORATOR TEMPERATURE
SENSES EVAPORATOR TEMPERATURE
12VDC POWER SUPPLY FOR DISPLAY BOARD
12VDC POWER SUPPLY FOR DISPLAY BOARD
SERIAL DATA RECEIVE
SERIAL DATE TRANSMIT
GROUND FOR DISPLAY BOARD POWER SUPPLY
GROUND FOR DISPLAY BOARD POWER SUPPLY
3-24
Series
Series
2
2
(400- )
(400- )
COLOR
WHITE
BLACK
PURPLE
BLUE
RED
YELLOW
ORANGE
BLUE/WHITE
BLUE/YELLOW
BLUE/YELLOW
BLACK
WHITE
RED
YELLOW
ORANGE
BLUE