– 19 –
Troubleshooting
PBC Location
Check
CN1 Fan Motor
See Motor Test Chart
CN2 Transformer (Primary)
120 VAC 7
Ω
CN3 Capacitor Fan Motor
25
µ
fd
CN4A Triac
1.3 VAC Min. Gate Voltage
CN4B Transformer (Secondary)
12 VAC .3
Ω
CN5 Ribbon
See Ribbon Test
SERVICE DIAGNOSTIC FLOW CHART
PUSH BUTTONS STUCK?
PUSH BUTTONS STUCK?
NO
NO
YES
YES
UNSTICK/ADJUST
NOTE #2
ORDER/INSTALL
ENTRY/DISPLAY
SUBASSEMBLY
HOOD CONTROL
DEAD?
YES
NO
• TURN HOUSE CIRCUIT
•
BREAKER OFF, THEN ON
• IS CONTROL OPERATION OK?
YES
DONE
NO
NO
~
= 120V AC
AT HOOD?
YES
FIX
WIRING
DONE
INSPECT
PCB IN
BLACKBOX
NOTE #1
NO
YES
DONE
HOOD
OK?
NO
~
= 12V AC
AT CONNECTOR
(CN4B) IN
BLACKBOX?
YES
ORDER/INSTALL
ENTRY/DISPLAY
ASSEMBLY
& CONTROL
PCBS
ORDER/
INSTALL
TRANSFORMER
YES
NO
FIX
WIRING
~
= 120V AC
AT
TRANSFORMER
PRIMARY?
DONE
YES
FAN
OK?
NO
YES
FAN BLADES
BLOCKED?
FIX/
ORDER
MOTOR
NO
CHECK IF 120V AC
IS PRESENT AT MOTOR
TERMINAL BLOCK
(IN LEFT BLACK BOX)
NO
YES
ORDER
MOTOR
INSPECT
PCB IN
BLACKBOX
NOTE #1
HOOD
OK?
NO
DONE
ORDER/INSTALL
ENTRY/DISPLAY
ASSEMBLY
& CONTROL
PCBS
NO
LIGHTS
OK?
DONE
NO
HOOD
LIGHTS
FLICKERING?
YES
YES
CHECK/MODIFY
TRIAC
CONNECTIONS
HOOD
LIGHTS
FLICKERING?
YES
NO
ORDER/INSTALL
CONTROL
PCBS
LIGHTS
ALWAYS
ON?
YES
NO
REMOVE
TRIAC
ORANGE
LEAD
LIGHTS
ON?
YES
NO
ORDER/
INSTALL
TRIAC
• TURN OFF THE LIGHT
•
FOR 1 MINUTE
• IS CONTROL OPERATION OK?
YES
CHECK IF 120V AC
IS PRESENT AT MOTOR
TERMINAL BLOCK
ORDER/INSTALL
ENTRY
SUBASSEMBLY
ORDER/INSTALL
ENTRY
ASSEMBLY
& CONTROL
PCBS
ORDER/INSTALL
ENTRY
ASSEMBLY
& CONTROL
PCBS
Note # 1:
Check parts in the black boxes as follows:
All connectors are locked in place and no leads are broken.
Connector solder joints are not broken on PCB copper side.
Capacitor (25uF 250V AC); Check that the capacitor is not
open or shorted by using a VOM.
Note # 2:
Check for button protrusion through the hood holes
and that he buttons have “movement”.