Amana Ufs18e Service Manual
Microwave Oven
Service Manual
DFS18G
DFS18E
UFS18E
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
This device is to be serviced only by properly qualified service personnel.
Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be
taken to avoid possible exposure to excessive microwave energy.
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.
SAFETY PRECAUTIONS
(Page)
SAFETY PRECAUTIONS
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Inside front cover
SPECIFICATIONS
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1-1
CAUTIONS
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2-1
INSTALLATIONS
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3-1
OPERATING INSTRUCTIONS
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4-1
OPERATING INSTRUCTIONS
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4-2
FEATURES
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4-1
CONTROL PANEL
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4-1
FEATURES
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4-2
CONTROL PANEL
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4-2
COOKING DISPLAYS
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4-3
OPERATION
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4-4
PROGRAMMING
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4-5
SCHEMATIC DIAGRAM
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4-6
CIRCUIT DESCRIPTION
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4-7
SERVICE INFORMATION
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5-1
TOOLS AND MEASURING INSTRUMENTS
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5-1
MICROWAVE LEAKAGE TEST
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5-1
MEASUREMENT OF MICROWAVE POWER OUTPUT
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5-3
DISASSEMBLY AND ADJUSTMENT
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5-3
INTERLOCK CONTINUITY TEST
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5-7
COMPONENT TEST PROCEDURE
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5-8
TROUBLE SHOOTING
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5-11
EXPLODED VIEW
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6-1
SCHEMATIC DIAGRAM OF P.C.B
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7-1
CIRCUIT BOARD
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7-2
CONTENTS
1-1
SPECIFICATIONS
This microwave oven is designed for commercial use only.
It is not recommended for buelt-in Installation.
ITEM
MODEL
Power Requirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Control Complement
Nameplate Location
Accessories
DESCRIPTION
DFS18G/DFS18E UFS18E
230 Volts AC 50 Hz 240 Volts AC 50 Hz
2,600 Watts (12 A) 2,700 Watts (12 A)
Single phase, 3 wire grounded
1,800 Watts full microwave power (IEC60705)
2,450 MHz
2M246
0 ~ 60 min.
21
3
/4” (W) x 141/4” (H) x 177/8” (D)
14
1
/4” (W) x 87/8” (H) x 163/8” (D)
64 lbs (approx.)
71 lbs (approx.)
Touch Control System
Clock : 00 ~ 60
Microwave Power for Variable Cooking
Power level
HIGH-------------------------------------------Full power throughout the cooking time
70% (Med.-High)
--------------------
approx. 70% of Full power
50% (Med.-Low)----------------------------approx. 50% of Full power
20% (Low)------------------------------------approx. 20% of Full power
Warning label
Back Side
¥ 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.
¥ For about 30 seconds after the oven stops, an electric
charge remains in the high voltage capacitor. When
replacing or checking, you must discharge the high
voltage capacitor by shorting across the two terminals
with an insulated screwdriver.
¥
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.
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.
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
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.
Gasket
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND
FILAMENT
TERMINALS
MAGNETRON
2-1
FILAMENT
TERMINALS
MAGNETRON
Gasket
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND
INSTALLATIONS
3-1
INSTALLING
1. Empty the microwave oven and clean inside it with
a soft,damp cloth.Check for damage such as
misaligned door,damage around the door or dents
inside the cavity or on the exterior.
2. Put the oven on a counter,table,or shelf that is
strong enough to hold the oven and the food and
utensils you put in it.(The control panel side of the
oven is the heavy side.Use care when handling.)
3. Do not block the vent and the air intake openings.
Blocking vent or air intake openings can cause
damage to the oven and poor cooking results.
Make sure the microwave oven legs are in place to
ensure proper air flow.
4. The oven should not be installed in any area where
heat and steam are generated,because they may
damage the electronic or mechanical parts of the
unit.
Do not install the oven next to a conventional
surface unit or above a conventional wall oven.
5. Use microwave oven in an ambient temperature
less than 104°F(40°C).
6. Place the microwave oven on a sturdy and flat
surface at least 10 cm(4 inches)from the wall.
7. Place the microwave oven as far away as possible
from TV,RADIO,COMPUTER,etc.,to prevent
interference.
8. Do not touch the front glass during or after cooking
of the Grill and Combination mode.
This glass is very hot during heater operating.
9. Do not operate the oven at microwave and
combination mode with Grill rack placed in the
cavity when the oven is empty.
EARTHING INSTRUCTIONS
This microwave oven is designed to be used in a fully
earthed condition.
It is imperative,therefore,to make sure it is properly
earthed before servicing
WARNINGTHIS APPLIANCE
MUST BE EARTHED
IMPORTANT
As the colors of the wires in the mains lead of this
appliance may not correspond with the colored
markings identifying the terminals in your plug,
proceed as follows.
The wire which is colored green-and-yellow must be
connected to the terminal in the plug which is marked
with the letter E or by the earth symbol ( )or
colored green or green-and-yellow.
The wire which is colored blue must be connected to
the terminal in the plug which is marked with the letter
N or colored black.
The wire which is colored brown must be connected
to the terminal in the plug which is marked with the
letter L or colored red.
BEFORE YOU BEGIN,READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.
The wires in this mains lead are colored in
accordance with the following code:
Green-and-yellow: Earth
Blue: Neutral
Brown: Live
10cm
4-1
FEATURES
CONTROL PANEL
OPERATING INSTRUCTIONS
DFS18E/UFS18E
Window Door Screen
Electronic Control
Safety Door Lock System
Display
Some items in display can be seen but will not glow.
Pads
TIME ENTRY
Pads 1-0
HOLD 0%,
DEFROST 20%,
MEDUIM 50%,
MED-HI 70%
STOP/RESET
START
QTY2x
Use to enter heating time without changing
preprogrammed number pads.
Use to begin heating with preprogrammed
times and power levels or to enter times for
“Manual Time Entry” cooking.
Use to select power level. Oven can heat at full
or reduced power. If oven power level is set to
0% oven does not heat for programmed time. If
no power level is selected, oven operates at
100% power.
Use to exit programming mode and stop
cooking during cooking cycle.
Use to start “Manual Time Entry” program or
restart interrupted cooking cycle. Use to
advance to next user option. Use to save times
and power levels when programming pads.
Use to automatically increase the programmed
time for double quantities.
4-2
OPERATING INSTRUCTIONS
FEATURES
CONTROL PANEL
DFS18G
Window Door Screen
Electronic Control
Safety Door Lock System
Display
Some items in display can be seen but will not glow.
Pads
TIME ENTRY
Pads 1-0
POWER LEVEL
STOP/RESET
START
QTY2x
Use to enter heating time without changing
preprogrammed number pads.
Use to begin heating with preprogrammed
times and power levels or to enter times for
“Manual Time Entry” cooking.
Use to select power level. Oven can heat at full
or reduced power. If oven power level is set to
0% oven does not heat for programmed time. If
no power level is selected, oven operates at
100% power.
Use to exit programming mode and stop
cooking during cooking cycle.
Use to start “Manual Time Entry” program or
restart interrupted cooking cycle. Use to
advance to next user option. Use to save times
and power levels when programming pads.
Use to automatically increase the programmed
time for double quantities.
Cooking Displays
Shows when power is connected to oven. Open and close
door to clear.
READY shows when oven control will accept entries.
Appears after oven door is opened and closed.
33:33 shows heating time. When more than 1 heating stage is
programmed, total time for all stages displays.
COOK shows when oven is operating.
20 indicates the microwave power level used. If power level
does not show, oven is heating at 100% power.
Cooking DisplaysCooking DisplaysCooking Displays
Programming Displays
Indicates programming mode. See “Programming” section
of manual for programming procedure.
Indicates programming user options mode. See “User
Options” section of manual for programming procedure.
Programming DisplaysProgramming DisplaysProgramming Displays
4-3
Operation
Pads
1
2
3
4
5
6
7
8
9
0
Heating
Times
10 sec.
20 sec.
30 sec.
45 sec.
1 min.
1:30 min.
2 min.
3 min.
4 min.
5 min.
Pads
01
02
03
04
05
06
07
08
09
10
1. Press Pad.
CAUTION
Interrupting Operation
• Open oven door to interrupt operation. Oven fan
continues to operate. Close door and press START
pad to resume oven operation.
• Press STOP/RESET pad to interrupt operation.
Display continues to show countdown time. Press
START pad to resume oven operation and
countdown timing.
Canceling Mistakes
• If oven is operating, press STOP/RESET pad once to
stop oven, then again to clear display.
• If oven door is open and time shows in display, close
oven door and press STOP/RESET pad to clear
display.
Operating Preprogrammed Pads
Oven has 10 ~ 20 preprogrammed number pads.
Instructions are written for factory programmed ovens.
Ovens that are reprogrammed can respond differently
than described below.
1. Open oven door , place food in oven, and close oven
door
• If pad is not pressed in 30 seconds, open and close
oven door again.
2. Press desired number pad.
• Oven operates and time counts down.
3. Oven stops heating and oven signal sounds when
heating timing elapses.
Operating QTY 2X Pads
QTY
2X
2. Press desired number pad
• Example : press + = 18 sec.
Preprogrammed Times and Cook Level
All preprogrammed pads arrive set at full power.
Option: Single Digit
Pads
11
12
13
14
15
16
17
18
19
20
Heating
Times
10 sec.
20 sec.
30 sec.
45 sec.
1 min.
1:30 min.
2 min.
3 min.
4 min.
5 min.
Heating
Times
20 sec.
40 sec.
1 min.
1:30 min.
2 min.
3 min.
4 min.
6 min.
8 min.
10 min.
Option: Double Digit
Manual Time Entry
Manual Time Entry feature allows the operator to enter
time and power levels, and heat without changing the
preprogrammed pads.
1. Open oven door, place food in oven, and close door.
• Display shows "READY".
• If pad is not pressed in 30 seconds, open and close
oven door again.
2. Press TIME ENTRY pad.
• Display shows "00:00".
3. Press number pads to enter desired cooking time.
• For example, to heat for 2 minutes 30 seconds,
press 2, 3, and 0 pads.
4. Press desired power level pad to change power level.
• If a power level pad is not pressed, oven defaults to
100% power.
• For example, pressing MEDIUM 50% pad sets oven
to 50% power.
• Display shows current power level if other than 100
percent power.
5. Press START pad.
• Oven operates and time counts down.
6. Oven stops heating and oven signal sounds when
heating timing elapses.
QTY
2X
1
To avoid fire, do not dry newspapers or clothes in
microwave oven.
4-4
PROGRAMMING
Preprogrammed Number Pads
Oven has 10 preprogrammed number pads. Follow
instructions below to program heating times and power
levels for customized cooking.
1. Open oven door.
¥ If door is closed or STOP/RESET pad is pressed
before finishing programming sequence, oven exits
programming mode.
2. Press and hold pad 1 for approximately 5 seconds.
¥ After 5 seconds, signal sounds. Display shows
ÒPROGRAMÓ indicating program mode..
3. Press desired number pad.
¥ Display shows heating time, ÒCOOK LEVELÓ and
power level if other than 100 percent power.
4. Press number pads to enter desired cooking time.
¥ For example, to heat for 2 minutes 30 seconds,
press 2, 3, and 0 pads.
5. Press desired power level pad to change power level.
¥ If a power level pad is not pressed, oven defaults to
100% power.
¥ For example, pressing MEDIUM 50% pad sets oven
to 50% power.
¥ Display shows current power level if other than 100%
power.
6. Press START pad to save new heating time and
power level in oven memory.
¥ Repeat step 3-6 to program additional pads.
7. Press STOP/RESET pad or close oven door to exit
programming mode.
Multiple Heating Stages
Follow instructions below to program oven to perform 3
consecutive heating cycles without interruption.
1. Open oven door.
¥ If door is closed or STOP/RESET pad is pressed
before finishing programming sequence, oven exits
programming mode.
2. Press pad 1 for approximately 5 seconds.
¥ After 5 seconds, signal sounds.
3. Press desired number pad.
¥ Display shows heating time and preprogrammed
number.
4. Press number pads to enter desired cooking time.
¥ For example, to heat for 2 minutes 30 seconds,
5. Press desired power level pad to change power level.
¥ If a power level pad is not pressed, oven defaults to
100% power.
¥ For example, pressing MEDIUM 50% pad sets oven
to 50% power.
¥ Display shows current power level if other than 100
percent power.
6. Press TIME ENTRY pad
¥ Display briefly shows ÒSTAGE 2Ó . Then cook time
and power level for stage show in display.
¥ Repeat steps 5-6 to create additional stages.
7. Press START pad to save new heating time and
power level in oven memory.
8. Press STOP/RESET pad or close oven door to exit
programming mode.
4-5
4-6
User Options
Follow the instructions below to customized the
microwave ovenÕs operation. End-of-cycle signal,
maximum heating time and other options can be
changed to meeting your cooking needs.
1. Open oven door.
• If door is closed or STOP/RESET pad is pressed
before finishing programming sequence, oven exits
programming mode.
2. Press and hold pad 2 for approximately 5 seconds.
• After 5 seconds, signal sounds. Display shows
“OPTION”.
3. Press number pad that matches desired option.
• “OP” represents optional program mode, first number
represents option number and second number
represents functions currently selected for option.
4. Press START pad to advance to next option.
See table for options.
5. Press number pad (0,1-3) to change option.
6. Press START pad to save changes.
• Repeat steps 4-6 to change additional options.
7. Press STOP/RESET pad or close oven door to exit
programming mode.
Optional Program
Indicator
Pad
Number
Option
Selected
Numbered Pads Display Options (Factory Settings in Bold)
1
End of Cycle Beep
2
Speaker Volume
3
Key Beep
4
Keyboard Enable
Window
5
Add Time during
Heating
6
Reset Door Open
7
(some models)
Maximum Heating Time
8
Manual Operation
9
(some models)
Double Digit Operation
0
Clean Filter Message
OP:10
OP:11
OP:12
OP:20
OP:21
OP: 22
OP:23
OP:30
OP:31
OP:40
OP:41
OP:42
OP:43
OP:50
OP:51
OP:60
OP:61
OP:70
OP:71
OP:80
OP:81
OP:90
OP:91
OP:00
OP: 01
OP:02
OP:03
3 second beep.
Continuous beep until door is opened.
5 beep bursts until door is opened.
Eliminates beep.
Sets volume to low.
Sets volume to medium.
Sets volume to high.
Prevents beep when pad is pressed.
Allows beep when pad is pressed.
15 seconds after oven door is opened, keyboard disabled.
30 seconds after oven door is opened, keyboard disabled.
1 minute after oven door is opened, keyboard disabled.
2 minutes after oven door is opened, keyboard disabled.
Prevents adding heating time while oven is heating.
Allows heating time to be changed while oven is heating when a memory pad
is pressed.
Allows oven to resume heating time countdown after door is opened during
cycle.
Cancels heating time count down after door is opened during cycle.
Allows 60 minutes of heating time (some models).
Allows 10 minutes of heating time.
Allows use of preprogrammed pads only.
Allows use of manual time entry and preprogrammed pads.
Allows 10 (0-9) preprogrammed pads.
Allows 100 (00-99) preprogrammed pads.
Do not display message.
Display message for 24 hours every 7 days.
Display message for 24 hours every 30 days.
Display message for 24 hours every 90 days.
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