Service Diagnostic Flowchart; Troubleshooting - GE Monogram ZV750 Technical Service Manual

NO
YES NO
FAN
OK?
YES
FIX/
ORDER
MOTOR
YES LIGHTS NO
OK?
HOOD
DONE
NO YES
LIGHTS
FLICKERING?
CHECK/MODIFY
TRIAC
CONNECTIONS
HOOD
NO
LIGHTS
FLICKERING?
LIGHTS
NO
YES
ALWAYS
ON?
REMOVE
TRIAC
ORANGE
YES NO
LIGHTS
LEAD
ON?
ORDER/
INSTALL
TRIAC
Note #1 — Check parts in the black box as follows:
All six connectors are locked in place and no leads are broken.
Connector solder joints are not broken on PCB copper side.
Fuse is OK.
Capacitor (12.5uf 250VAC); Check that cap, is not open or shorted by using VOM.

Troubleshooting

SERVICE DIAGNOSTIC FLOWCHART

WARNING
POWER MUST BE DISCONNECTED
BEFORE SERVICING THE APPLIANCE
NO
PUSH BUTTONS STUCK?
NO
PUSH BUTTONS STUCK?
NO
HOOD CONTROL
RED DISPLA Y
YES
LIGHT
BLINKING?
REMOVE/
RE-SEA T
RIGHT
FILTER
NO
FAN BLADES
BLOCKED?
• CHECK FM CAP (CN3)
NO
• UNPLUG CN1, CHECK
FM RESISTANCE
• FM OK?
YES
INSPECT
PCB IN
BLACKBOX
NOTE #1
YES
NO
YES HOOD
OK?
DONE
ORDER/INSTALL
CONTROL
ORDER/INSTALL
PCBs
ENTRY/DISPLAY
ASSEMBLY
& CONTROL
PCBs
YES
UNSTICK/ADJUST
NOTE #2
YES
ORDER/INSTALL
ENTRY/DISPLAY
SUBASSEMBLY
YES
DEAD?
INSPECT
PCB IN
BLACKBOX
NOTE #1
YES HOOD
OK?
DONE
ORDER/INSTALL
ENTRY/DISPLAY
ASSEMBLY
& CONTROL
PCBs
= ~
120V AC
ORDER/
YES AT
INSTALL
TRANSFORMER
TRANSFORMER
PRIMARY?
Note #2 — Loosen and re-position entry/display assembly as follows:
Loosen (2) screws on under surface of hood
Loosen (2) screws on assembly pusher plate
Check for button protrusion through the hood
holes and that buttons have movement
– 17 –
REMOVE
RIGHT
FILTER
CHECK/ADJUST
MICROSWITCH
RED DISPLA Y
YES NO
LIGHT
BLINKING?
RED DISPLA Y
NO YES
LIGHT
BLINKING?
NO
= ~
120V AC
NO YES
AT HOOD?
FIX
WIRING
DONE
= ~
12V AC
YES AT CONNECTOR NO
(CN4B) IN
BLACKBOX?
FUSE IN
NO
YES NO
BLACKBOX
OK?
FIX REPLACE
NO YES
UNIT NOW
WIRING
OK?
DONE
DONE
GEA00012