GE Monogram ZV750, Technical Service Manual

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ELECTRONIC HOOD CONTROL DESCRIPTION

The electronic hood control system consists of the following parts:   Entry/Display Assembly;   Control PCB;
Triac;   Fuse Holder;   Motor Capacitor;   Transformer;   Halogen Lamps;   Filter Microswitch;  and   Induc-
tion Fan Motor.

CAUTION: Components are electrically HOT on the electronic control when voltage is connected to the
hood even though the ON/OFF switch is in the OFF position.

1.  ENTRY/DISPLAY ASSEMBLY

The replacement assembly WB27X10345 has 3 Printed Circuit Boards (PCB) mounted in a plastic enclo-
sure with 8 push buttons and a ribbon cable. The three PCBs are Fan Touch Control PCB, Lamp Touch
Control PCB, and Display PCB.

Note: Before replacing the assembly, check the operation of the other hood components by plugging the
new Entry/Display Assembly cable into connector CN5 on the Control PCB. If the unit does not work,
replace the control board first and then recheck whether the existing Entry/Display assembly is OK.  The
harness in the hood can be used instead of the one supplied with the assembly by carefully removing the
five screws from the enclosure assembly and unplugging the cable.

2.   CONTROL PCB

This PCB has an AC to DC power supply, microprocessor, and fan relays and is located in the black box in
the hood chimney area.

Note: The 5 green connectors are locking type. Use a small flat blade screwdriver to unlock as follows:
Insert screwdriver in the center of the space between the plug and connector receptacle on the PCB. Push
down on the screwdriver handle to pivot blade about 5 degrees and pull out the plug at the same time.

TO CHECK OPERATION OF CONTROL PCB:
Check that all 6 connectors are locked in place, no leads are broken, and connector solder joints are not
broken on PCB copper tracks.

Note: Mini Manual
on Control PCB
Cover.

Note: Mini Manual
on Control PCB
Cover.

Triac

Motor
Capacitor

Black Box

Fuse Holder

Control PCB

Brown

Orange

Black

3/16"
Terminal

1/4"
Terminals 

GEA00016

ZV750

ZV850

Triac

Motor Capacitor

Black Box

Fuse Holder

Control PCB

Transformer

Brown

Orange

Black

3/16"
Terminal
 

1/4"

Terminals 

GEA00015

Entry
Control
Enclosure