Sears 721.80522500 User manual

삼흥
정판
삼흥
정판
DIVISION 22
BASIC FIELD MANUAL
FOR
MICROWAVE HOOD COMBINATION
MODEL 721.80522500
721.80529500
721.80524500
721.80523500
October, 2005
MODEL 721.80522
721.80529
721.80524
721.80523

CAUTION
WARNING TO SERVICE TECHNICIANS
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY
a. Do not operate or allow the oven to be operated with the door open.
b. Make the following safety checks on all ovens to be serviced before activating the
magnetron or other microwave source, and make repairs as necessary; (1) Interlock
operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and
other damage), (4) damage to or loosening of hinges and latches, (5) evidence of
dropping or abuse.
c. Before turning on microwave power for any service test or inspection within the
microwave generating compartments, check the magnetron, wave guide or
transmission line, and cavity for proper alignment, integrity, and connections.
d. Any defective or misadjusted components in the interlock, monitor, door seal, and
microwave generation and transmission systems shall be repaired, replaced, or
adjusted by procedures described in this manual before the oven is released to the
owner.
e. A Microwave leakage check to verify compliance with the Federal performance
standard should be performed on each oven prior to release to the owner.
• Proper operation of the microwave ovens requires that the magnetron be assembled to the wave guide and cavity.
Never operate the magnetron unless it is properly installed.
• Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the
magnetron.
• Routine service safety procedures should be exercised at all times.
• Untrained personnel should not attempt service without a thorough review of the test procedures and safety
information contained in this manual.

FOREWORD
Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing
yourself to the Microwave Energy normally contained within the oven cavity.
MODEL 721.80522
721.80529
721.80524
721.80523
TABLE OF CONTENTS
(Page)
SAFETY PRECAUTIONS ................................................................................................................Inside front page
SPECIFICATIONS................................................................................................................................................ 1-1
CAUTIONS ........................................................................................................................................................... 2-1
INSTALLATIONS.................................................................................................................................................. 3-1
OPERATING INSTRUCTIONS............................................................................................................................. 4-1
CONTROL PANEL ............................................................................................................................................... 4-1
CONTROL PANEL INSTRUCTIONS.................................................................................................................... 4-2
OVERALL CIRCUIT DIAGRAM............................................................................................................................ 5-1
SCHEMATIC DIAGRAM....................................................................................................................................... 5-1
MATRIX CIRCUIT FOR TOUCH KEY BOARD .................................................................................................... 5-2
GENERAL INFORMATION FOR SERVICE ......................................................................................................... 6-1
GENERAL PRECAUTIONS IN USE .................................................................................................................... 6-1
TRIAL OPERATION ............................................................................................................................................. 6-1
FEATURES AND SPECIFICATIONS FEATURES............................................................................................... 6-1
SERVICE INFORMATION.................................................................................................................................... 7-1
PRECAUTIONS AND REPAIR SERVICE TIPS ................................................................................................... 7-1
MICROWAVE LEAKAGE TEST ........................................................................................................................... 7-2
POWER OUTPUT MEASUREMENT.................................................................................................................... 7-3
DISASSEMBLY INSTRUCTIONS ........................................................................................................................ 7-4
INTERLOCK SYSTEM ....................................................................................................................................... 7-12
INTERLOCK CONTINUITY TEST ...................................................................................................................... 7-14
TEST AND CHECKOUT PROCEDURES AND TROUBLESHOOTING............................................................. 7-15
A. TEST PROCEDURES.................................................................................................................................... 7-15
B. CHECKOUT PROCEDURES......................................................................................................................... 7-20
C. TROUBLESHOOTING ................................................................................................................................... 7-22
EXPLODED VIEW ................................................................................................................................................ 8-1
PART REFERENCE LIST .................................................................................................................................... 9-1

1-1
SPECIFICATIONS
Rated Power Consumption ................................1560W maximum (Microwave oven+Cook top lamps+Ventilation fan)
Microwave Output ...............................................1000W (IEC60705)
Frequency ..........................................................2450 MHz ± 50 MHz
Power Supply .....................................................120 VAC, 60 Hz
Rated Current ....................................................13.3 Amp. (Microwave oven+Cook top lamps+Ventilation fan)
Magnetron Cooling .............................................Forced Air Cooling
Rectification .......................................................Rectification Voltage Double Half-Wave
Door Sealing ......................................................Choke System
Safety Devices ...................................................Magnetron Thermostat: Open at 145 °C ± 5 °C
Close at 60 °C ± 5 °C
............................................................................Oven Thermostat: Open at 110 °C ± 5 °C
Close at 0 °C ± 5 °C
............................................................................Fuse(20A)
............................................................................Primary Interlock Switch
............................................................................Secondary Interlock Switch
............................................................................Interlock Monitor Switch
Magnetron ..........................................................2M246
Cook top Lamp ...................................................120 V, 30 W
Cavity Lamp .......................................................125 V, 30 W or 40 W
Timer ..................................................................Digital, up to 99 min. 99 sec. (in each cooking stage)
Tray ....................................................................Tempered Safety Glass
Overall Dimensions ............................................2915/16”(W) x 167/16”(H) x 153/8” (D)
Oven Cavity Size ...............................................211/4” (W) x 97/16” (H) x 143/16”(D)
Effective Capacity of Oven Cavity ......................1.7 Cu.ft.
Accessories ........................................................Owner’s Manual & Cooking Guide, Installation Manual,
............................................................................Exhaust Adapter, Exhaust Damper, Mounting Kit and Filter,
............................................................................Support, Hub, Glass Tray, Metal Rack.
SWITCH CHART
SWITCH MODE
CONDITIONS
DOOR OPEN OPEN OPEN CLOSE
CLOSE CLOSE OPEN
DOOR CLOSED
PRIMARY
INTERLOCK
SWITCH
SECONDARY
INTERLOCK
SWITCH
INTERLOCK
MONITOR
SWITCH
COM
NO
COM
NO
COM
NC
NOTE: Use the above switch chart with circuit diagram on page 5-1.

2-1
CAUTIONS
Unlike other appliances, the microwave oven is
high-voltage and high-current equipment.
Though it is free from danger in ordinary use,
extreme care should be taken during repair.
MICROWAVE RADIATION
Personnel should not be exposed to the
microwave energy which may radiate from the
magnetron or other microwave generating
device if it is improperly used or connection.
All input and output microwave connections,
waveguide, flange, and gasket must be secure
never operate the device without a microwave
energy absorbing load attached.
Never look into an open waveguide or antenna
while the device is energized.
• DO NOT operate on a 2-wire extension cord during repair
and use.
• NEVER TOUCH any oven components or wiring during
operation.
• BEFORE TOUCHING any parts of the oven, always
remove the power plug from the outlet.
• Remove your watches whenever working close to or
replacing the Magnetron.
• DO NOT touch any parts of the control panel circuit. A
resulting static electric discharge may damage this P.C.B.
• NEVER operate the oven with no load.
• NEVER injure the door seal and front plate of the oven
cavity.
• NEVER put iron tools on the magnetron.
• NEVER put anything into the latch hole and the interlock
switches area.
• Proper operation of the microwave oven requires that
the magnetron be assembled to the waveguide and
cavity. Never operate the magnetron unless it is
properly installed.
• Be sure that the magnetron gasket is properly
installed around the dome of the tube whenever
installing the magnetron.
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
Gasket
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND FILAMENT
TERMINALS
MAGNETRON

3-1
INSTALLATIONS
BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.
PRECAUTIONS ON INSTALLATION
A. Plug the power supply cord into a 120V AC, 60Hz,
single-phase power source with a capacity of at
least 20 amperes.
B. Avoid placing the unit in a location where there is
direct heat or splashing water.
C. Install the unit on the mounting plate firmly.
D. Place the unit as far away as possible from TV,
radio, etc. to prevent interference.
GROUNDING INSTRUCTIONS
For personal safety, this appliance must be fully
grounded at all times.
In the event of an electrical short circuit, grounding
reduces the risk of electrical shock.
The plug must be plugged into an outlet that is
properly installed and grounded.
CAUTION
This unit is equipped with a 3-prong plug for your
safety. If the wall outlet is a grounded 3-hole type,
the unit will be grounded automatically.
WARNING
Improper use of the grounding plug can result in a
risk of electric shock.
Do not, under any circumstances, cut or remove the
third ground prong from the power cord plug.
Plug with Ground
Prong
Properly Polarized
and Grounded
Outlet

4-1
OPERATING INSTRUCTIONS
CONTROL PANEL
1
2
6
9
11
15
19
23
27
24
12
5
8
10
14
16
17
18
21
20
22
25
28
26
13
7
4
3

4-2
CONTROL PANEL INSTRUCTIONS
1. Display. The display includes a clock and indicators
to tell you time of day, cooking time settings, cook
powers, quantities, weights and cooking functions
selected.
2. Dinner Plate. Touch this pad to cook without
entering a cook time or power.
3. Frozen Entree. Touch this pad to cook a 10 -to 20-
ounce (284 to 567g) frozen entree without entering
a cook time or power.
4. Potato. Touch this pad to cook potatoes without
entering a cook time or power.
5. Soup or Sauce. Touch this pad to cook without
entering a cook time or power.
6. Frozen Vegetable. Touch this pad to cook without
entering a cook time or power.
7. Fresh Vegetable. Touch this pad to cook without
entering a cook time or power.
8. Canned Vegetable. Touch this pad to cook without
entering a cook time or power.
9. Popcorn. Touch this pad to pop popcorn with the
sensor feature. The oven’s sensor will tell the oven
how long to cook depending on the amount of
humidity it detects from the popcorn.
10. Pizza. Touch this pad to reheat one or several
slices of pizza without entering a cook time or
power.
11. Auto Cook. Touch this pad to cook microwavable
foods without entering a cook time or power.
12. Auto Reheat. Touch this pad to reheat
microwavable foods without entering a cook time
or power.
13. Hold Warm. Touch this pad to keep hot, cooked
foods safely warm in your oven for up to 99
minutes, 99 seconds. Hold Warm can be used by
itself, or it can automatically follow a cooking cycle.
14. Auto Defrost. Touch this pad followed by Number
Pads to thaw frozen meat by weight.
15. Number Pads. Touch number pads to enter
cooking times, cook powers, quantities, weights,or
food categories.
16. Express Defrost. Touch this pad to express
defrost. “GROUND BEEF 1.0 LBS TOUCH
START” will appear in the display.
17. Add Minute. Touch this pad to cook for 1 minute
at 100%cook power, or to add extra minutes at the
set cook power to your cooking cycle.
18. More. Touch this pad to add 10 seconds of cook
time each time you press it.
19. Cook Time. Touch this pad followed by Number
Pads to set a cooking time.
20. Power. Touch this pad after the cook time has
been set, followed by a Number Pad to set the
amount of microwave energy released to cook the
food. The higher the number, the higher the
microwave power or “cooking speed.”
21. Less. Touch this pad to subtract 10 seconds of
cook time each time you press it.
22. Kitchen Timer. Touch this pad to set the kitchen
timer.
23. START. Touch this pad to start a function. If you
open the door after the oven begins to cook,
retouch START.
24. STOP/Clear. Touch this pad to erase an incorrect
command, cancel a program during cooking, or to
clear the Display.
25. Clock. Touch this pad to enter the correct time of
day.
26. Fan ( )On/Off. Touch this pad to turn the fan on
or off.
27. Fan ( )5 Speed. Touch this pad to choose one
of 5 fan speeds.
28. Light ( ). Touch this pad to turn the light on
high, night or off.
NOTE: If you try to enter incorrect instructions, you
will not hear any tones. Touch STOP/Clear and
re-enter the instructions.

5-1
OVERALL CIRCUIT DIAGRAM
SCHEMATIC DIAGRAM

5-2
MATRIX CIRCUIT FOR TOUCH KEY BOARD
9
4
8
37
6
2
15
0
Clock
START
STOP
Timer
Kitchen
Clear
Power
Less
More
Frozen
Vegetable
Frozen
Entree
Hold
Warm Canned
Vegetable
VENT
On/Off 5 Speed LIGHT
HIigh/Night/Off
VENT Plate
Dinner Soup or
Sauce N.C N.C
N.C
Fresh
Vegetable
Reheat
Cook
Auto
Defrost
Express
Defrost
Add
Minute
Potato
Cook
Time
Pizza Popcorn
N.C N.C
Auto
Auto
N.C
13
12
11
10
9
8
123457
6
KEY MATRIX