SCHEMATICS
51
HhB 2 Oven Schematic
Figure 45, page 49.
NOTE: Schematic shows the oven with door open
and without power applied.
Color Code (Line Voltage)
BL – Blue = Line V (208/240)
BR – Brown = Line V (208/240)
Color Code (Low/Control Voltage)
BK – Black = 24 VDC Common
OR – Orange = Status Input
WH – White = Control Input
RD – Red = +24 VDC
Line Voltage Components
Blower Motor
Blower Motor Controller
Cooling Fans
Fuses
Heater Element
Power Supply, +24VDC
Rack Oscillator Motor
Relay
Solid State Relay
Thermostat – Cooling Fan
Thermostat – Hi-Limit
Voltage Sensor Module
Wiring Harness – Line Voltage
Low Voltage Components
Cable – Smart Card Connector
Display, VFD
Door Switch
I/O Control Board
Keypad
Ribbon Connector – Display
Smart Card Reader
Thermocouple – CC
Thermocouple – EC
Wiring Harness – Low Voltage
I/O Control Board Component Identification
and Test Point Locations
Figure 46, page 52
J2 40-Pin Connector for LV Harness
J3 3-Pin Connector for VFD Display
J4 14-Pin Connector for Keypad
J5 26-Pin Connector for Display Data
RJ11 Connector for Smart Card Cable
U15 EPROM Socket
P1 Voltage Reference 0-5 VDC
P3 Blower Controller Pin Configuration
SKP1 Beeper
R51 Beeper Volume Adjustment
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