MICROWAVE OVEN HOODS
WARNING
NEVER TOUCH OR SERVICE THE
HIGH VOLTAGE CIRCUIT WITHOUT
DISCHARGING CAPACITOR BY
SHORTING ACROSS ITS TERMINALS.
TO AVOID POSSIBLE ELECTRICAL
SHOCK.
OVEN THERMAL CUTOUT
(FLAME SENSOR)
The Oven Thermal Cutout is located on the top
side of the Oven Cavity beside Exhaust duct
with a temperature rating of 248°F.(120°C.) The
cutout is tightly held to the top of the oven cavity
by a spring clip.
NOTE :
If cutout cannot be removed from clip
oven will have to be removed from
installation and outer case removed.
ANTENNA
The antenna is motor driven and located on the
upper side of the cavity. The oven uses a top
feed wave guide. The antenna blade is located in
the wave guide and the motor is located on the
wave guide.
To Service Antenna Blade
1. Disconnect power and open the door.
2. Remove the clip and turn the antenna cover
left.
3. Remove antenna cover and the antenna will
come with it.
KEY PANEL TEST
If necessary the key panel pads can be verified
by a continuity test. For ease of handling the key
panel should be removed and placed on a flat
surface.
RIBBON
SMART BOARD
SMART BOARD is used to serve as an electrical
interface between the control and the oven.
SMART BOARD is located on the back of the
control panel assembly.
The SMART BOARD contains the power relay,
LVT, vent blower and surface light relays, and
other components to perform the proper
switching cir-cuits. Several disconnect plugs are
also located on the SMART BOARD:
•
CON 1 - 16 Pin Ribbon Connector
•
CON 2 - 07 Pin Vent Blower Connector
•
CON 3 - 06 Pin Primary L.V.T & Main Relay
•
CON 4 - Door Sensing
Many diagnostic circuit tests can be made at the
disconnect plugs. (Refer to diagnosis flow chart
and simplified schematic in mini-manuals.)
VARISTOR REPLACEMENT
1. Clip old varistor wires at Green varistor body
(leaving two short leads).
2. Replacement varistor has push-on terminals
connected.(WB27x5230)
3. Plug new varistor on the cut leads. Check for
tightness.
CONTROL PERFORMANCE TEST
•
Set Clock-Touch clock pad, enter time of day,
AM/PM touch start pad.
•
Alternately touch each function pad and enter
time or temperature, selection for the function
- also change power levels.
•
Touch Clear-Off after each function test to
clear that funtion.
•
Repeat procedure for each function to
exercise each pad.
•
Control and display should respond to each
entry.
•
Display should revert to Time-Of-Day after
each Clear-Off.
Refer results to Diagnosis Flow Chart.
CAPACITOR AND DIODE
The high voltage capacitor and diode can be
serviced through Control Panel after removing
grille.
MAGNETRON, MAGNETRON FAN,
VENT BLOWER AND POWER
TRANSFORMER
Oven must be removed from wall.
REMOVING OVEN FROM WALL
(2 PEOPLE REQUIRED)
Oven is hooked on metal tabs at bottom of wall
mounting plate and fastened to cabinet by (3)
top cabinet bolts.
CAUTION :
Oven weights 62 lbs. Requires 2
people for removal.
1. Disconnect Power Cord, Top vented models -
disconnect duct and remove damper assembly.
2. Remove (3) top cabinet bolts.
3. Pull unit forward slowly providing adequate
support to prevent dropping unit during
removal of last top cabinet bolt.
10~16
1~9
10
9
16
316137215
PAD
CONN.
PAD
CONN.
ADD 30SEC
4-11
CLEAR
3-12
BEVERAGE
6-11
VENT FAN
8-12
POWER LEVEL
3-14
TIMER 4-13
DEFROST 4-15
START
3-11
AM/PM
9-13
1
9-16
SURFACE LIGHT
7-12
2
8-16
CLOCK
7-13
3
7-16
TURNTABLE
5-12
4
6-16
REMINDER
5-13
5
5-16
TIMER COOK
5-15
6
4-16
DELAY START
6-13
7
9-15
REHEAT
9-14
8
8-15
POPCORN
5-11
9
7-15
HELP
4-12
0
6-15
•
TECHNICAL DATA SHEET
•
TOUCH "OFF" PADS
TURN "OFF"?
KEY PANEL
OR
SMART BOARD
VENT FAN OR LIGHT
"ON" ONLY WHEN PAD
TOUCHED
REPLACE
SMART BOARD
TOUCH FAN & LIGHT PADS
Y
Y
Y
Y
N
N
N
VENT FAN & LIGHT "ON"
AND STAYS "ON"?
ONLY FAN
OR
LIGHT WORKS
NO FAN
&
NO LIGHT
CHECK SMART BOARD 16PIN PLUG
• VENT FAN AT 8-12
• SURFACE LIGHT AT 7-12
• PLUGS
• WIRING
• LAMPS
• FAN OR
• SMART
BOARD
• SMART BOARD
OR
• KEY PANEL
• XFMR
• PLUGS OR
• SMART
BOARD
REPAIR
CHEK
• 120V SUPPLY
• IF 20A FUSE BLOWN, CHECK
VARISTOR.
• MAGN TCO ALL OK?
NORMAL
DISPLAY LIT
OPEN DOOR
IS OVEN LIGHT "ON" ?
LARGE WATER LOAD
& NEON IN OVEN
OPEN LIGHT &
BLOWER "ON"
AND STAYS"ON"?
MW PWR "ON"?
(NEON LIGHT)
REPL
SMART BOARD
• SMART BOARD
OR
KEY PANEL
• CLOSE DOOR
• RUN CONTROL PERFORM-
ANCE TEST (SEE TEST)
• DOES IT PASS?
• PROGRAM TIME COOK 30 MIN
• DOES OVEN START
WITHOUT TOUCHED "START"?
• ONLY LIGHT
&
FAN ON
• NO MW PWR
LIGHT FAN
&
MW PWR "ON"
CHECK
• LIGHT
• DOOR S/W AND MAIN RELAY
• WIRING
• CHANGE TO PWR 5
• NEON CYCLE?
• VERIFY XFMR VOLTS
OK?
• CANNOT SET CLOCK
• NO OR ONLY SOME PADS WORK
• DISPLAY NOT WHATA ENTERED
• ERRATIC DISPLAY
• NO BEEP
• DISPLAY GOES BLANK, FF, RESET
• CANNOT CLEAR DISPLAY
• XFMR PLUGS
OR
• SMART BOARD
CHECK
• 120V SUPPLY
• 20A FUSE
• (IF BLOWN CHECK VARISTOR)
• MAGN TCO & OVEN CUTOUT.
• CONTROL XFMR VOLTS
ALL OK?
N
N
N
N
N
N
N
N
N
N
N
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
REPAIR
CAUTION
OBSERVE
PRECAUTIONS
FOR HANDLING
ELECTROSTATIC
SENSITIVE
DEVICES
PERFORM KEY PANEL TEST
• SMART BOARD
OR
• KEY PANEL
• WITH OVEN RUNNING
CHECK NEON CYCLE
CHECK POWER
CONTROL REPLAY
TURNED ON
NO OVEN LIGHT
&
NO BLOWER
LIGHT & BLOWER ON
ONLY WHEN START
PAD TOUCHED
SMART BOARD OR
HV SECT
CHK WINDINGS
AT PLUG
INTERLOCKS
DOOR SWITCH
CONTROL XFMR
KEY PANEL
OR
SMMART BOARD
WITH START PAD TOUCHED
CHECK LIGHT/BLOWER
5-12 VDC PLUG
• OPEN & CLOSE DOOR
• LIGHT & BLOWER
STILL ON
SMART
BOARD
REPLACE
SMART
BOARD
REPLACE
SMART
BOARD
OVEN LIGHT &
BLOWER STILL ON
REPL
XFMR
• CLEAR OFF &
PROGRAM 30 SEC
START & TIME OUT
• DOES IT TURN "OFF"?
• TOUCH START
To Service Antenna Motor
1. Disconnect power and remove grille screws(2).
2. Remove grille and the bracket duct upper
screws(1).
3. Remove the bracket duct upper and disconnect
the antenna motor wire.
4. Remove antenna motor screws(2) and pull the
antenna motor .
To Service Turntable Motor
1. Disconnect power and remove bottom plate
screws(3).
2. Remove bottom plate and disconnect the
turntable motor wire.
3. Remove turntable motor screws(2) and pull
the turntable motor out.
N
FMV145 2/6/01 3:11 PM Page 1
