Electrolux GLMV169GBA, GLMV169GSB, GLMV169GQA, PLMVZ169GCA, GLMV169GBB Service Manual

GLMV169GSB
GLMV169GBB
GLMV169GQB
PLMVZ169GCB

In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should
be used.

WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and
current. Contact with the following parts may result in a severe, possibly fatal, electrical shock. (High Voltage Capaci­tor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)

TABLE OF CONTENTS

Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO

AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY..................... INSIDE FRONT COVER

BEFORE SERVICING....................................................................................................... INSIDE FRONT COVER

WARNING TO SERVICE PERSONNEL................................................................................................................. 3

MICROWAVE MEASUREMENT PROCEDURE..................................................................................................... 4

FOREWORD AND WARNING ...............................................................................................................................5

PRODUCT SPECIFICATIONS ............................................................................................................................... 6

GENERAL INFORMATION....................................................................................................................................6

OPERATION........................................................................................................................................................... 9

TROUBLESHOOTING GUIDE............................................................................................................................. 14

TEST PROCEDURE ............................................................................................................................................16

TOUCH CONTROL PANEL ASSEMBLY .............................................................................................................. 28

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE.................................................................34

PICTORIAL DIAGRAM......................................................................................................................................... 42

POWER UNIT CIRCUIT....................................................................................................................................... 43

LSI UNIT CIRCUIT ............................................................................................................................................... 44

PRINTED WIRING BOARD.................................................................................................................................. 45

PARTS LIST .........................................................................................................................................................46

PACKING AND ACCESSORIES...........................................................................................................................51

S37M277MV169G

GLMV169GSB
GLMV169GBB
GLMV169GQB
PLMVZ169GCB

OVER THE RANGE

MICROWAVE OVENS

MODELS

ELECTROLUX SERVICE MANUAL

ElEctrolux HoME ProDuctS, INc.

P. O. Box 212378, Augusta, GA, 30917

800•944•9044

This document has been published to be used for after sales service only. The contents are subject to change without notice.

GLMV169GBB

GLMV169GSA
GLMV169GBA
GLMV169GQA
PLMVZ169GCA

GLMV169GSB
GLMV169GBB
BLMV169GQB
PLMVZ169GCB
PLMVZ169GCC

48

Publication # 5995506226

P/N 316439265

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 genera-

tion 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.

(RD2110U)

BEFORE SERVICING

Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact ELECTROLUX HOME
PRODUCTS, INC. immediately.

If the unit operates with the door open, service person should 1) tell the user not to operate the
oven and 2) contact ELECTROLUX HOME PRODUCTS, INC. and Food and Drug Administration's
Center for Devices and Radiological Health immediately.

Service personnel should inform ELECTROLUX HOME PRODUCTS, INC. of any certified unit
found with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use
the unit until the oven has been brought into compliance.

(RD8100U)

2

WARNING TO SERVICE PERSONNEL

Don't Touch !
Danger High Voltage

Microwave ovens contain circuitry capable of pro­ducing very high voltage and current, contact with
following parts
fatal, electrical shock.

(Example)
High Voltage Capacitor, High Voltage Power

Transformer, Magnetron, High Voltage Rectifier
Assembly, High Voltage Harness etc..

Read the Service Manual carefully and follow all
instructions.

Before Servicing

may result in a severe, possibly

1. Disconnect the power supply cord , and t h en
remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

WARNING: RISK OF ELECTRIC SHOCK.

DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.

The high-voltage capacitor remains charged about 60
seconds after the oven has been switched off. Wait for
60 seconds and then short-circuit the connection of the
high-voltage capacitor (that is the connecting lead of the
high-voltage rectifier) against the chassis with the use of
an insulated screwdriver.

Whenever troubleshooting is performed the power supply
must be disconnected. It may in, some cases, be necessary
to connect the power supply after the outer case has been
removed, in this event,

1. Disconnect the power supply cord, and then remove
outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the leads to the primary of the power
transformer.

5. Ensure that these leads remain isolated from other
components and oven chassis by using insulation
tape.

6. After that procedure, reconnect the power supply cord.

When the testing is completed,

1. Disconnect the power supply cord, and then remove
outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Reconnect the leads to the primary of the power
transformer.

5. Reinstall the outer case (cabinet).

6. Reconnect the power supply cord after the outer case
is installed.

7. Run the oven and check all functions.

After repairing

1. Reconnect all leads removed from components during
testing.

2. Reinstall the outer case (cabinet).

3. Reconnect the power supply cord after the outer case
is installed.

4. Run the oven and check all functions.

Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup
of cold water on the oven turntable, close the door and set
the power to HIGH and set the microwave timer for two (2)
minutes. When the two minutes has elapsed (timer at zero)
carefully check that the water is now hot. If the water remains
cold carry out Before Servicing procedure and re-examine
the connections to the component being tested.

When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and microwave leakage test should be carried out.

3

MICROWAVE MEASUREMENT PROCEDURE

A. Requirements:

1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave
oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to
acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more
from the external surface of the oven.

2) Safety interlock switches:

Primary interlock relay switch shall prevent microwave radiation emission in excess of the requirement as above
mentioned. Secondary interlock relay and door sensing switch shall prevent microwave radiation emission in excess

of

5 mW/cm2 at any point 5cm or more from the external surface of the oven.

B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:

1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.

Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for
microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.

2) Place the oven tray in the oven cavity.

3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5

O

C (68OF) in the center of the oven cavity.

The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)

and made of an electrically nonconductive material such as glass or plastic.

The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage

is measured accurately.

4) Set the cooking control on Full Power Cooking Mode.

5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.

C. Leakage test:

Closed-door leakage test (microwave measurement):

1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the
oven.

2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.

3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the
metal has been breached (eg., around the switches, indicator, and vents).

While testing for leakage around the door, pull the door away from the front of the oven as far as is permitted by the

closed latch assembly.

4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the primary interlock switch/secondary interlock relay does turn the oven OFF before any door movement.

NOTE: After servicing, record data on service invoice and microwave leakage report.

4

SERVICE MANUAL

ELECTROLUX

OVER THE RANGE

MICROWAVE OVEN

PRODUCT DESCRIPTION

GLMV169GSB / GLMV169GBB

GLMV169GQB / PLMVZ169GCC

FOREWORD

This Manual has been prepared to provide Electrolux Home Prod­ucts

Service Personnel with Operation and Service Information for the
ELECTROLUX OVER THE RANGE MICROWAVE OVENS, GLM­V169GSB, GLMV169GBB, GLMV169GQB, PLMVZ169GCC.

It is recommended that service personnel carefully study the entire
text of this manual so that they will be qualified to render satisfactory
customer service.

Check the interlock switches and the door seal carefully. Special
attention should be given to avoid electrical shock and microwave
radiation hazard.

WARNING

Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.

Servicing and repair work must be carried out only by trained service
personnel.

DANGER

Certain initial parts are intentionally not grounded and present
a risk of electrical shock only during servicing. Service
personnel - Do not contact the following parts while the ap­pliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.

GENERAL INFORMATION

OPERATION

TROUBLESHOOTING GUIDE AND
TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

PARTS LIST

All the parts marked “*” on parts list are used at voltages more
than 250V.

Removal of the outer wrap gives access to voltage above 250V.

All the parts marked “ ” on parts list may cause undue microwave
exposure, by themselves, or when they are damaged, loosened
or removed.

∆

ELECTROLUX HOME PRODUCTS, INC.

5

PRODUCT SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts / 14.2 Amperes
60 Hertz
Single phase, 3 wire grounded

Power Output 1000 watts (IEC-705 TEST PROCEDURE)
Operating frequency of 2450MHz

Case Dimensions Width 29-15/16"
Height 16-3/8"
Depth 14- 15/32" (Not including the door handle)

Cooking Cavity Dimensions Width 21"
Height 8-7/8"

1.6 Cubic Feet Depth 14-7/16"

Hood lamp 2 bulbs, 20W x 2, Incandescent light bulbs

Hood fan Approx. 300 C.F.M.

Control Complement Touch Control System
Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)

Microwave Power for Variable Cooking

Repetition Rate;

P-HI .................................................. Full power throughout the cooking time

P-90 ..................................................................... approx. 90% of Full Power

P-80 ..................................................................... approx. 80% of Full Power

P-70 ..................................................................... approx. 70% of Full Power

P-60 ..................................................................... approx. 60% of Full Power

P-50 ..................................................................... approx. 50% of Full Power

P-40 ..................................................................... approx. 40% of Full Power

P-30 .................................................................... approx. 30% of Full Power

P-20 ..................................................................... approx. 20% of Full Power

P-10 ..................................................................... approx. 10% of Full Power

P-0 ..................................................... No power throughout the cooking time

SENSOR COOKING pads, DEFROST pads, ONE-TOUCH COOKING pads,

Memory Cook pad, Number selection pads, Power Level pad, Timer / Pause pad,
Clock pad, Auto Fan, Plus 1 Miute pad, Turntable On / Off pad, START pad
Work Light pad, Night Light pad, FAN HI / LO pad, Clear/Off pad

Oven Cavity Light 20W x 1 Incandescent light bulb

Safety Standard UL Listed FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J

Weight Approx. 56 lbs.

GENERAL INFORMATION

GROUNDING INSTRUCTIONS

This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.

WARNING: Improper use of the grounding plug can result in a risk of electric shock.

6

Electrical Requirements

3-Pronged Plug

Grounded
Receptacle Box

Grounding Pin

3-Pronged Receptacle

OVEN DIAGRAM

10

11

12

8

7

14

6

9

3

4

5

1

9

13

2

The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE
GROUNDING PIN FROM THE PLUG.
The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more dedicated line,
using a grounded receptacle. The receptacle should be located inside the cabinet directly above the Microwave Oven/Hood
system mounting location.

1. Oven door with see-through window.

2. Door hinges.

3. Stirrer cover.

4. Turntable motor shaft.

5. Oven lamp.
It will light when oven is operating or door is open.

6. Door latches.
The oven will not operate unless the door is securely closed.

7. Auto-Touch control panel.

8. Time display: Digital display, 99 minutes 99 seconds.

7

9. Ventilation openings.

10. Light Cover.

11. Grease filters.

12. Removable turntable.
The turntable will rotate clockwise or counterclockwise.
Only remove for cleaning.

13. Removable turntable support.

14. Power supply cord

CONTROL PANEL

GLMV169GBB / GLMV169GSB

GLMV169GQB / PLMVZ169GCC

(Colors will vary)

8

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

The following is a description of component functions dur­ing oven operation.

OFF CONDITION

Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).

1. The display will show "WELCOME, PRESS CLEAR AND
PRESS CLOCK".

To set any program or set the clock, you must first touch

the STOP/CLEAR pad. The display will clear, and " : "
will appear .

COOKING CONDITION

Program desired cooking time touching the NUMBER pads.
When the START pad is touched, the following operations
occur:

1. The contacts of relays are closed and components
connected to the relays are turned on as follows.

(For details, refer to Figure O-2)

RELAY CONNECTED COMPONENTS

RY1 Oven lamp / Fan motor / Stirrer motor

RY2 Power transformer

RY3 Turntable motor

RY4 Hood fan motor

2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.3 volts
A.C. output on the filament winding, and approximately
2000 volts A.C. on the high voltage winding.

3. The filament winding voltage heats the magnetron
filament and the H.V. winding voltage is sent to a voltage
doubler circuit.

4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feed­box, and then into the cavity where the food is placed
to be cooked.

5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.

6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, primary interlock switch,
and secondary interlock relay are activated with the
following results. The circuits to the stirrer motor, the
cooling fan motor, the turntable motor, and the high
voltage components are de-energized, and the digital
read-out displays the time still remaining in the cook
cycle when the door was opened.

7. The monitor switch is electrically monitoring the operation
of the primary interlock switch, and door sensing switch

is mechanically associated with the door so that it will
function in the following sequence.
(1) When the door opens from a closed position, the

secondary interlock relay, door sensing switch, and
primary interlock switch open their contacts, and
then the monitor switch contacts close.

(2) When the door is closed from the open position,

the monitor switch contacts open first. Then the
contacts of the primary interlock switch and door
sensing switch close. And contacts of the relay
(RY1) open.

If the primary interlock switch and secondary interlock

relay (RY2) fail with the contacts closed when the door
is opened, the closing of the monitor switch contacts will
form a short circuit through the monitor fuse, primary
interlock switch, relay (RY1) and secondary interlock
relay (RY2), causing the monitor fuse to blow.

POWER LEVEL P-0 TO P-90 COOKING

When Variable Cooking Power is programmed, the 120
volts A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY2) which is operated by the
control unit within an interval second time base. Microwave
power operation is as follows:

VARI-MODE ON TIME OFF TIME

Power 10(P-HI) 32 sec. 0 sec.
(100% power)

Power 9(P-90) 30 sec. 2 sec.
(approx. 90% power)

Power 8(P-80) 26 sec. 6 sec.
(approx. 80% power)
Power 7(P-70) 24 sec. 8 sec.
(approx. 70% power)

Power 6(P-60) 22 sec. 10 sec.
(approx. 60% power)

Power 5(P-50) 18 sec. 14 sec.
(approx. 50% power)

Power 4(P-40) 16 sec. 16 sec.
(approx. 40% power)

Power 3(P-30) 12 sec. 20 sec.
(approx. 30% power)

Power 2(P-20) 8 sec. 24 sec.
(approx. 20% power)

Power 1(P-10) 6 sec. 26 sec.
(approx. 10% power)

Power 0(P-0) 0 sec. 32 sec.
(0% power)

Note: The ON/OFF time ratio does not correspond with the

percentage of microwave power, because approx. 2
seconds are needed for heating of the magnetron
filament.

9

GLMV169GSB
GLMV169GBB
GLMV169GQB
PLMVZ169GCB/PLMVZ169GCC

BREAKFAST, LUNCH, DINNER

BREAKFAST, LUNCH, DINNER will automatically compute
the microwave power and cooking time. Set the desired pro­gram by touching one of the BREAKFAST, LUNCH, DINNER
pads, and number pad to select menu. Enter the weight or
quantity by touching the Number pads. When the START
pad is touched, the following operations occur:

1. The COOK indicator will light.

2. The cooking time will appear on the display and start
counting down to zero. The cooking time is adjusted
automatically according to the weight of the food.

3. The shut-off relays (RY1, RY2 and RY3) are energized,
turning on the oven lamp, turntable motor, cooling fan
motor and convection motor. The power supply voltage
is applied to the heating element.

4. Now, the oven is in the microwave cooking mode.

COMPU DEFROST COOKING

The COMPU DEFROST key is a special function key to
defrost meats and poultry faster and better. COMPU DE­FROST automatically defrosts roast beef, etc.. Touch the
COMPU COOK pad and number pad to select menu and
enter the food weight by touching the number pads. When
the START pad is touched, the oven will cook according to
the special cooking sequence.

3. RE-CIRCULATION (INSIDE VENTING)
The air handing is the same as VERTICAL VENTING

except that the final air discharge is directed horizontally
through the upper front of the oven into the kitchen. IN
this case, the accessory charcoal filter RK-230 must be
provided to filter the air before it leaves the oven.

AIR FLOW

HOOD FAN MOTOR

HOOD EXHAUST
LOUVER

HOOD
INTAKE
DUCT

CHARCOAL
FILTER

VENTILATION METHODS HOT AIR EXHAUST

1. VERTICAL VENTING

For this venting method, hot air rising from the conventional

range below is drawn in by the hood fan motor through
the grease filters at the right and left sides of the base
cover, up through the right and left sides of the oven
cavity, then discharged vertically at rear center top of
the oven, into the customer's vent system.

AIR FLOW

TO DUCT

HOOD FAN MOTOR

HOOD
INTAKE
DUCT

GREASE
FILTER

2. HORIZONTAL VENTING

The air handing is the same as VERTICAL VENTING

except that the final air discharge is directed horizontally
out from the top rear of the oven into the customer's vent
system.

AIR FLOW

HOOD FAN MOTOR

HOOD
INTAKE
DUCT

TO DUCT

TO DUCT

GREASE
FILTER

10

SENSOR COOKING CONDITION

Using the SENSOR function, food is cooked without figur­ing time, power level or quantity. When the oven senses
enough steam from the food, it relays the information to its
microprocessor which will calculate the remaining cooking
time and power level needed for best results. When the food
is cooked, water vapor is developed. the sensor "senses"
the vapor and its resistance increase gradually. When the
resistance reaches the value set according to the menu,
supplementary cooking is started.
The time of supplementary cooking is determined by experi­ment with each food category and inputted into the LSI. An
example of how sensor works: (Potatoes)

GLMV169GSB
GLMV169GBB
GLMV169GQB
PLMVZ169GCB/C

any vapor from the oven cavity and sensor.

NOTE: During this rst stage, do not open the door or

touch STOP/CLEAR pad.

4. When the sensor detects the vapor emitted from the
food, the display switches over to the remaining
cooking time and the timer counts down to zero.
At this time, the door may be opened to stir food, turn
it or season, etc.

5. When the timer reaches zero, an audible signal
sounds.The shut-off relay and cook relay are de-
energized and the power transformer, oven lamp, etc.
are turned off.

6. Opening the door or touching the STOP/CLEAR pad,
the time of day will reappear on the display and the
oven will revert to an OFF condition.

1. Potatoes at room temperature. Vapor is emitted very
slowly.

2.Heat Potatoes. Moisture and humidity is emitted very
rapidly. You can smell the aroma as it cooks.

Cooking Sequence.

1. Touch one of the Sensor Cooking pads. And then touch
START/TOUCH ON pad.
NOTE: The oven should not be operated on Sensor Cooking
immediately after plugging in the unit. Wait two
minutes before cooking on Sensor Cooking.

2. The coil of shut-off relays (RY1 and RY3) are energized,
the oven lamp, turntable motor and cooling fan motor are
turned on, but the power transformer is not turned on.

3. After about 32 seconds, the cook relay (RY2) is energized.
The power transformer is turned on, microwave energy
is produced and first stage is started.

The 32 seconds is the cooling time required to remove

11

GLMV169GSB
GLMV169GBB
GLMV169GQB
PLMVZ169GCB/PLMVZ169GCC

BLK

GRN

120VAC

GND

60 Hz

L

FUSE

20A

WHT

RESISTOR 470 kW 1/2W

N

NOISE FILTER

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. CLOCK APPEARS ON DISPLAY

MAG. TEMP FU SE

K

L

B

RED

BLK

YLW

HOOD FAN

BLK

BLK

THERMAL
CUT OUT

BLK

BLK

WHT

WHT

BLK

WHT

LINE BYPASS CAPACITOR

0.0033 uF 250V

GND

NOISE SUPRESSION COIL

LINE CROSS CAPACITOR 1.0 uF 275V

LINE BYPASS CAPACITOR

0.0033 uF 250V

BLU
WHT

HOOD
MOTOR

BLU

YLW

RED

BLU

BLU

NOTES:

1. Circuits subject to change without notice

2. Terminal with projection or opposite blue mark on lamp socket
must be connected to neutral wire.

3. Only certain models use the absolute humidity sensor.

.

4. Power Transformer (Start Lead) terminal must be connected to hot wire (RED)

A5

B1

C5

B3

CONTROL UNIT

High

Low

HOOD
CAPACITOR

A1

RED

G

R

O

B

L

K

OVEN THERMAL
CUT OUT

RY4

RY5

NC

RY3

A9

A3

PPL or BLU

YLW

WHT

BLU

BLU

RY6

HOOD
LAMP

RY1

N. O.

A7

ORG

WHT

WHT

OVEN
LAMP
RELAY

COM.

ORG

B

L

K

RED

N. O

C3

C1

WHT

GRY

G

K

R

L
B

O

SECONDARY

INTERLOCK

TURN­TABLE
RELAY

COM

TURN­TABLE
MOTOR

RY2

RELAY

RY7

BLK

RED

TTM

COM

B

L

K

O

R

G

R

E

D

GRN

E2

E1

RED

F3

F2

F1

HUMIDITY
SENSOR

BLK

RED

OL

OVEN

STIRRER

LAMP

MOTOR

WHT

WHT

GRY
WHT

COM

PRIMARY
INTERLOCK
SWITCH

STOP

SWITCH

RED

STM

BLK

MONITOR
SWITCH

RED

BLK

FM

FAN

MOTOR

WHT

WHT

N.O.

RED

ORG

POWER
TRANSFORMER

.

C

.

N

COM

WHT

WHT

WHT

WHT

WHT

WHT

WHT

HIGH
VOLTAGE
CAPACITOR

F

u

x

x

HIGH
VOLTAGE
RECTIFIER

MAGNETRON

120VAC
60 Hz

WHT

BLK

GRN

GND

L

FUSE

N

NOISE FILTER

Figure O-1. Oven Schematic-Off Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. VARIAB L E COOKI N G CONTROL
"HIGH"

MAG. TEMP FU SE

K

L

B

RED

BLK

YLW

HOOD FAN

BLK

BLK

THERMAL
CUT OUT

20A

LINE BYPASS CAPACITOR

0.0033 uF 250V

GND

RESISTOR 470 kW 1/2W

NOISE SUPRESSION COIL

LINE CROSS CAPACITOR 1.0 uF 275V

LINE BYPASS CAPACITOR

0.0033 uF 250V

BLU

BLU

BLU
WHT

BLK

BLK

WHT

WHT

BLK

WHT

HOOD
MOTOR

BLU

YLW

RED

NOTES:

1. Circuits subject to change without notice

2. Terminal with projection or opposite blue mark on lamp socket
must be connected to neutral wire.

3. Only certain models use the absolute humidity sensor.
.

4. Power Transformer (Start Lead) terminal must be connected to hot wire (RED)

A5

B1

C5

B3

CONTROL UNIT

High

Low

HOOD
CAPACITOR

A1

RED

G

R

O

B

L

K

OVEN THERMAL
CUT OUT

RY4

RY5

NC

RY3

A3

PPL or BLU

YLW

WHT

BLU

BLU

A9

HOOD
LAMP

RY1

RY6

N. O.

A7

ORG

WHT

WHT

OVEN
LAMP
RELAY

COM.

ORG

B

L

K

RED

N. O

C3

C1

WHT

GRY

G

K

R

L
B

O

SECONDARY

INTERLOCK

TURN­TABLE
RELAY

COM

TURN­TABLE
MOTOR

RY2

RELAY

RED

TTM

RY7

BLK

COM

B

L

K

O

R

G

R

E

D

GRN

E2

E1

RED

F3

F2

F1

HUMIDITY
SENSOR

BLK

RED

OL

OVEN

STIRRER

LAMP

MOTOR

WHT

WHT

GRY

WHT

COM

PRIMARY
INTERLOCK
SWITCH

STOP

SWITCH

RED

STM

BLK

RED

BLK

FM

FAN

MOTOR

WHT

WHT

N.O.

N

MONITOR
SWITCH

COM

WHT

WHT

WHT

RED

ORG

POWER
TRANSFORMER

.

C

.

HIGH
VOLTAGE
CAPACITOR

F

u

x

WHT

WHT

WHT

WHT

x

HIGH
VOLTAGE
RECTIFIER

MAGNETRON

Figure O-2. Oven Schematic-Cooking Condition

12

DESCRIPTION AND FUNCTION OF COMPONENTS

GLMV169GSB
GLMV169GBB
GLMV169GQB
PLMVZ169GCB/C

DOOR OPEN MECHANISM

The door is opened by pulling the door handle, refer to the
Figure D-1.

Latch
Hook

Latch
Heads

Door

Door
Sensing
Switch

Monitor
Switch

Primary
Interlock
Switch

Figure D-1. Door Open Mechanism

DOOR SENSING SWITCH, PRIMARY INTERLOCK
SWITCH

The primary interlock switch is mounted in the lower position
of the latch hook, the door sensing switch in the primary
interlock system is mounted in the upper position of the
latch hook is mounted on upper position of the latch hook.
They are activated by the latch heads on the door. When
the door is opened, the switches interrupt the circuit to all
components. A cook cycle cannot take place until the door
is firmly closed thereby activating both interlock switches.
The primary interlock system consists of the door sensing
switch and secondary interlock relay located on the control
circuit board.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the
latch head on the door while the door is closed. The switch
is intended to render the oven inoperative, by means of
blowing the monitor fuse, when the contacts of the second­ary interlock relay (RY2) and primary interlock switch fail to
open when the door is opened.

Functions:

1. When the door is opened, the monitor switch contact
close (to the ON condition) due to their being normally
closed. At this time the secondary interlock relay (RY2),
primary interlock switch are in the OFF condition (contacts
open) due to their being normally open contact switches.
And the contacts of relay (RY1) are in the ON condition
(contacts close).

2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing
switch and the primary interlock switch contacts close.
(On opening the door, each of these switches operate
inversely.)

3. If the door is opened, and the secondary interlock relay
(RY2) and primary interlock switch contacts fail to open,
the monitor fuse blows simultaneously with closing of the

monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR

FUSE TEST THE DOOR SENSING SWITCH,
SECONDARY INTERLOCK RELAY (RY2), RE­LAY (RY1), PRIMARY INTERLOCK SWITCH
AND MONITOR SWITCH FOR PROPER
OPERATION. (REFER TO CHAPTER "TEST
PROCEDURE").

NOTE: MONITOR FUSE AND MONITOR SWITCH ARE

REPLACED AS AN ASSEMBLY.

THERMAL CUT-OUT (HOOD )

This thermal cut-out located on the right base plate. It
is designed to automatically turn on the hood fan motor
whenever the hot air rising from the conventional range
below causes the temperature at the thermal cut-out to rise
to 140OF (60OC) or higher, thus removing this hot air from
around microwave oven. When the temperature around the
thermal cut-out drops to 113OF (45OC) or lower, the thermal
cut-out shuts off the hood fan motor.

THERMAL CUT-OUT (CAVITY )

This thermal cut-out is located on the top of the oven cavity.
It is designed to prevent damage to the oven unit if the food
in the oven catches fire due to overheating produced by
improper setting of cooking time or failure of control unit.
Under normal operation, the thermal cut-out remains closed.
However, the thermal cut-out will open at 293OF (145OC)
causing the oven to shut down.

TURNTABLE MOTOR

The turntable motor rotates the turntable located on the
bottom of the oven cavity, so that the foods on the turnta­ble cook evenly during cooking. Turntable will turn in either
direction. The turntable motor can be turned off by touching
TURNTABLE ON/OFF pad.

COOLING FAN MOTOR

The cooling fan motor drives a blade which draws external
cool air. This cool air is directed through the air vanes sur­rounding the magnetron and cools the magnetron. This air
is channelled through the oven cavity to remove steam and
vapors given off from the heating foods. It is then exhausted
through the exhausting air vents at the oven cavity.

HOOD FAN MOTOR

The hood fan motor is a two-speed, single-phase, double
pole induction type, requiring a hood fan capacitor. It is
located outside the upper rear part of the oven cavity, is
to remove, from around the oven, hot air rising from the
conventional electric or gas range over which it is installed.
This air is then expelled either vertically or horizontally
through the customer supplied duct system, or discharged
back into the kitchen.

13

GLMV169GSB
GLMV169GBB
GLMV169GQB
PLMVZ169GCB/C

STIRRER MOTOR

The stirrer motor drives the stirrer fan to stir the microwave
radiation from the waveguide.

HOOD LAMP

The hood lamps are mounted at the hood lamp angle on
the base cover. The hood lamps can be turned off and on by
touching the WORK LIGHT pad or the NIGHT LIGHT pad. And
also the brightness can be varied to high or low by touching
the WORK LIGHT pad or the NIGHT LIGHT pad.

TROUBLESHOOTING GUIDE

Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is con­nected.

When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many
of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter
which will be found in the "Test Procedure "section.

IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1)

secondary interlock relay (RY2), door sensing switch and primary interlock switch before replacing the moni­tor fuse. If the monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA016/KIT
as an assembly.

IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases,

be necessary to connect the power supply cord after the outer case has been removed, in this event,

1. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the leads to the primary of the power transformer.

5. Ensure that the leads remain isolated from other components and oven chassis by using insulation
tape.

6. After that procedure, reconnect the power supply cord.

When the testing is completed

1. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Reconnect the leads to the primary of the power transformer.

5. Reinstall the outer case (cabinet).

6. Reconnect the power supply cord after the outer case is installed.

7. Run the oven and check all functions.

14

R AH SENSOR

Q NOISE FILTER

CK

LOW VOLTAGE

CK

NO POWER AT OUTLET

RE

SHORTED IN POWER CORD

CK

OPENED OR SHORTED WIRING

CK

HOOD MOTOR CAPACITOR

RE

HOOD LAMP OR SOCKET

CK

TURNTABLE OFF CONDITION

RE

STIRRER MOTOR

RE

TURNTABLE MOTOR

RE

FAN MOTOR

RE

OVEN LAMP OR SOCKET

P

FOIL PATERN ON P.W.B.

O

COMPU DEFROST

N

RELAY (RY-5)

N

RELAY (RY-4)

N

RELAY (RY-3)

N

RELAY (RY-2)

N

RELAY (RY-1)

M

KEY UNIT

L

CONTROL UNIT

K

HOOD FAN MOTOR

J

HOOD HERMAL CUT-OUT

I

MONITOR FUSE

H

MONITOR SWITCH

G

SECONDARY INTERLOCK SYSTEM

F

PRIMARY INTERLOCK SWITCH

E

TEMPERATURE FUSE OR THERMAL CUT-OUT

D

HIGH VOLTAGE CAPACITOR

C

H.V. RECTIFIER

B

POWER TRANSFORMER

A

MAGNETRON

GLMV169GSB
GLMV169GBB
GLMV169GQB
PLMVZ169GCB/C

CK = Check / RE = Replace

POSSIBLE CASE AND
DEFECTIVE PARTS

TEST PROCEDURE

PROBLEM

Home fuse blows when power cord is plugged into wall receptacle.

CONDITION

.

Monitor fuse blows when power cord is plugged into wall receptacle.

Display does not illuminate when power cord is first plugged into wall

receptacle.

Display does not operate properly when CLEAR/OFF key is touched.

(The time of day should appear on the display with beep sound during

normal condition.)

Oven lamp does not light with door is opened.

Hood fan motor operates when power cord is first plugged into wall

receptacle.

Temperature of oven base seems more than 140ûF (60ûC) because of

operation of the range below. But hood fan motor does not turn on

automatically. (Normally, food fan motor should be operating at low

speed.)

Hood lights do not turn on when WORK LIGHT pad or NIGHT LIGHT pad

is pressed.

Hood fan motor does not rotate at all with touched FAN HI/LO pad.

Speed of the hood fan motor does not change when the FAN HI/LO pad is

touched for this function.

OFF

CONDITION

IDLE

CONDITION

Oven lamp does not light in cook cycle. (But it does light when door is

opened.)

Fan motor does not operate. (Oven lamp and turntable motor operate.)

Turntable motor does not operate (Oven lamp lights and fan motor

operate.)

Oven does not go into cook cycle when START pad is touched

Oven seems to be operating but little or no heat is produced in oven load.

(Food incompletely cooked or not cooked at all at end of cook cycle.)

Oven goes into a cook cycle but extremely uneven heating is produced in

oven load (food).

Variable cooking does not operate properly except Cooking Power 10 (P-

COOKING

CONDITION

MICROWAVE

HI) mode.

Function of COMPU DEFROST does not operate properly.

The oven stops and "ERROR" is displayed or does not end during

condition. (Oven does not shut off after a cup of water

Sensor Cooking

Stirrer motor does not operate. (Other parts operate.)

Oven goes into COMPU DEFROST but food is not defrosted well.

is boiling by Sensor Cooking.)

Oven stops at 32 seconds after starting

SENSOR

COOKING

CONDITION

15