2. Control Board Layout

Display/Change

Rail Setpoint

Rail Temperature,

Alarm Display, and

Service Menu

LED on for

Negative Values

Display/Change Cabinet Setpoint

"UP" Button

"DOWN" Button

Cabinet Temperature,

Alarm Display, and

Service Menu

Energy Saving Mode LED

(Not used this model) "SERVICE USE ONLY" Button

"MANUAL DEFROST" button

K341 Connector

# 1, 2 Rail Fan Relay (Orange)

K101 Connector

# 1, 3 Transformer 10V

Control Voltage (Dark Blue)

K151 Connector

#1, 2 Condenser Thermistor (Gray) (Clogged Filter Thermistor)

#3, 4 Defrost Thermistor (Orange) (Cabinet) (DTh)

#5, 6 Cabinet Thermistor (Black) (CTh)

#7, 8 Service Jumper (White)

K201 Connector

#1, 2 Rail Switch (Yellow)

#3, 4 Defrost Thermistor

(Orange. Not used, but must be in place)

#5, 6 Rail Thermistor (Black) (RTh)

#7, 8 Rail Switch (Pink)

Front

Rear

Board Part Number

K311 Connector

#1, 2 Comp Control Relay (Brown)

#3, 4 Cabinet Evaporator Fan Relay (Red)

#5, 6 Defrost Heater Relay (Orange)

Chip Revision

Fuse 3A 125V

K361 Connector

#1, 3 Rail Liquid Line Solenoid Valve (RLLV)

#1, 5 Cabinet Liquid Line Solenoid Valve (CLLV)

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Hoshizaki 73168 service manual Front Rear, Control Board Layout