Samsung SMH7175WE Operating instructions

Brand: Samsung

Model: SMH7175WE

Category: Microwaves

Type: Operating instructions

This manual is also suitable for

MICROWAVE OVEN

SERVICE

Manual

MICROWAVE OVEN CONTENTS

1. Precaution

2. Speciﬁcations

3. Operating Instructions

4. Disassembly and Reassembly

5. Alignment and Adjustments

6. Troubleshooting

7. Exploded Views and Parts List

8. PCB Diagrams

9. Schematic Diagrams

10. Reference

SEA

BASIC : SMH7178STD

MODEL : SMH7178STE

1. Precaution 1

1-1 Safety precautions 1

1-2 Special Servicing Precautions (Continued) 2

1-3 Special High Voltage Precautions 2

2. Speciﬁcations 3

2-1 Table of Speciﬁcations 3

3. Operating Instructions 4

3-1 Control Panel 4

3-2 Features & External Views 5

3-3 Accessary 6

3-4 INSTALLATION 7

3-4 REUSABLE GREASE FILTERS 8

4. Disassembly and Reassembly 9

4-1 Replacement of Magnetron, Motor Assembly and Lamp 9

4-2 Replacement of High Voltage Transformer 9

4-3 Replacement of Door Assembly 10

4-3-1 Removal of Door “C” 10

4-3-2 Removal of Door “E” 10

4-3-3 Removal of Key Door & Spring 10

4-3-4 Reassembly Test 11

4-4 Replacement of Fuse & H.V.Trans Fuse 11

4-5 Replacement of Drive Motor 11

4-6 Replacement of stirrer motor 12

4-7 Removal of stirrer 12

4-8 Replacement of Control Circuit Board 13

4-8-1 Removal of Control Box 13

4-3-4 Removal of P.C.B Assembly 13

5. Alignment and Adjustments 14

5-1 High Voltage Transformer 14

5-2 Low Voltage Transformer 14

5-3 Magnetron 14

5-4 High Voltage Capacitor 15

5-5 High Voltage Diode 15

5-6 Main Relay and Power Control Relay 15

5-7 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch 15

5-8 VENT EXHAUST BLOWER MOTOR 16

5-9 THERMAL CUTOUT(TCO’s) 17

5-9-1 Oven Thermal Cutout (Flame sensor) 17

5-9-2 Replacement of Flame Sensor 17

5-9-3 Bottom Thermal Cutout 18

5-9-4 Magnetron Thermal Cutout 18

5-9-5 Magnetron Thermal Cutout 19

5-10 SENSOR 19

5-11 Output Power of Magnetron 20

5-12 Procedure for Measurement of Microwave Energy Leakage 21

5-13 Check for Microwave Leakage 21

5-14 Note on Measurement 21

5-15 Leakage Measuring Procedure 21

6. Troubleshooting 22

6-1 Electrical Malfunction 22

6-1 Electrical Malfunction(continued) 23

7. Exploded Views and Parts List 24

7-1 Exploded Views 24

7-2 Main Parts List 25

Contents

7-3 Control & Door Parts List 28

7-4 Standard Parts List 29

8. P.C.B Diagrams 30

8-1 P.C.B Diagrams 30

8-2 P.C.B Parts List 31

8-2 P.C.B Parts List(continued) 32

9. Schematic Diagrams 33

9-1 Schematic Diagrams 33

10. Reference 34

10-1 Model name standard 34

10-2 Customer inquiry cases and countermeasures 35

10-2 Customer inquiry cases and countermeasures (Continued) 36

Contents

(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.

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.

PRECAUTIONS TO BE OBSERVED BEFORE AND

DURING SERVICING TO AVOID POSSIBLE

EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

- 1 -

1. Precaution

Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use,

repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially

lethal high voltages and currents.

1. All repairs should be done in accordance with the

procedures described in this manual. This product

complies with Federal Performance Standard 21

CFR Subchapter J(DHHS).

2. Microwave emission check should be performed

to prior to servicing if the oven is operative.

3. If the oven operates with the door open :

Instruct the user not to operate the oven and

contact the manufacturer and the center for devices

and

radiological health immediately.

4. Notify the Central Service Center if the

microwave leakage exceeds 5 mW/cm

5. Check all grounds.

6. Do not power the MWO from a “2-prong”

AC cord. Be sure that all of the built-in

protective devices are replaced. Restore any

missing protective shields.

7. When reinstalling the chassis and its

assemblies, be sure to restore all protective

devices, including: nonmetallic control

knobs and compartment covers.

8. Make sure that there are no cabinet openings

through which people --particularly children

--might insert objects and contact dangerous

voltages. Examples: Lamp hole,ventilation slots.

9. Inform the manufacturer of any oven foundto

have emission in excess of 5 mW/cm

,Make

repairs to bring the unit into compliance at no cost

to owner and try to determine cause.

Instruct owner not to use oven until it has been

brought into compliance.

CENTRAL SERVICE CENTER

10. Service technicians should remove their watches

while repairing an MWO.

11. To avoid any possible radiation hazard,replace

parts in accordance with the wiring diagram. Also,

use only the exact replacements for the following

parts: Primary and secondary interlock switches,

interlock monitor switch.

12. If the fuse is blown by the Interlock Monitor Switch:

Replace all of the following at the same time:

Primary, door sensing switch and power relay, as

well as the Interlock Monitor Switch. The correct

adjustment of these switches is described

elsewhere in this manual. Make sure that the fuse

has the correct rating for the particular model being

repaired.

13. Design Alteration Warning:

Use exact replacement parts only, i.e.,only those

that are speciﬁed in thedrawings and parts lists

of this manual. This is especially important for the

Interlock switches, described above. Never alter

or add to the mechanical or electrical design of the

MWO. Any design changes or additions will void

the manufacturer’s warranty. Always unplug the

unit’s AC power cord from the AC power source

before attempting to remove or reinstall any

component or assembly.

14. Never defeat any of the B+ voltage interlocks.

Do not apply AC power to the unit (or any of its

assemblies) unless all solid-state heat sinks are

correctly installed.

15. Some semiconductor (“solid state”) devices are

easily damaged by static electricity. Such

components are called Electrostatically Sensi-

tive Devices (ESDs). Examples include integrated

circuits and ﬁeld-effect transistors. Immediately

before handling any semiconductor components

or assemblies, drain the electrostatic charge from

your body by touching a known earth ground.

16. Always connect a test instrument’s ground lead to

the instrument chassis ground before connecting

the positive lead; always remove the instrument’s

ground lead last.

1-1 Safety precautions ( )

- 2 -

1-2 Special Servicing Precautions (Continued)

17. When checking the continuity of the witches or transformer,

always make sure that the power is OFF, and one of the

lead wires is disconnected.

18. Components that are critical for safety are indicated in the

circuit diagram by shading, or .

19. Use replacement components that have the same ratings,

especially for ﬂame resistance and dielectric strength speciﬁcations.

A replacement part that does not have the same safety characteristics

as the original might create shock, ﬁre or other hazards.

NOTE : Connect the oven to a 20A. When connecting the oven to a

15A,make sure that circuit breaker can operate.

1. High Voltage Warning Do not attempt to

measure any of the high voltages --this includes

the ﬁlament voltage of the magnetron. High

voltage is present during any cook cycle.

Before touching any components or wiring,

always unplug the oven and discharge the high

voltage capacitor (See Figure 1-1)

2. The high-voltage capacitor remains charged

about 30 seconds after disconnection. Short the

negative terminal of the high-voltage capacitor to

to the oven chassis. (Use a screwdriver.)

3. High voltage is maintained within speciﬁed limits

by close-tolerance, safety-related components

and adjustments. If the high voltage exceeds the

speciﬁed limits, check each of the special

components.

PRECAUTION

There exists HIGH VOLTAGE ELECTRICITY with

high current capabilities in the circuits of the HIGH

VOLTAGE TRANSFORMER secondary and ﬁla-

ment terminals. It is extremely dangerous to work

on or near these circuits with the oven energized.

DO NOT measure the voltage in the high voltage

circuit including ﬁlament voltage of magnetron.

PRECAUTION

Never touch any circuit wiring with your hand nor

with uninsulated tool during operation.

PRECAUTION

Servicemen should remove their watches when-

ever working close to or replacing the magnetron.

1-3 Special High Voltage Precautions

Fig. 1-1 Discharging High Voltage Capacitor

High Voltage Capacitor

- 3 -

2. Speciﬁcations

2-1 Table of Speciﬁcations

TIMER

POWER SOURCE

POWER CONSUMPTION

OUTPUT POWER

OPERATING FREQUENCY

MAGNETRON

COOLING METHOD

OUTSIDE DIMENSIONS

NET WEIGHT

SHIPPING WEIGHT

99 MINUTES 99 SECONDS

120V 60Hz, AC

MICROWAVE : 1,650W

FROM 100 TO 1100W(10 LEVEL POWER)

(IEC-705 TEST PROCEDURE)

2,450MHz

OM75P(10)ERHN

COOLING FAN MOTOR

14/16

”(W) x 15

15/16

”(H) x 15

11/32

”(D) mm

58.4 lbs

64.4 lbs

- 4 -

3. Operating Instructions

3-1 Control Panel

1. Sensor Reheat

2. Power Defrost

Sets weight of food to be defrosted.

3. Sensor Cook Buttons p.11

Sensor settings to cook popular foods.

4. Handy Helper, Kids Meals, Snack Bar

Selects type of dish to be reheated.

5. More/Less

Increase or decrease cooking time.

6. Number Buttons

Set cooking times or amounts and power

levels other than high.

7. Power Level

Press this pad to set a power level other

than high.

8. Clock am/pm

Sets current time

9. Light On/Night/Off Button

10. Turntable On/Off Button

11. One Minute +

Press once for every minute of cooking at

High power.

12. My Choice

Press to set non-cooking feature.

13. Custom Cook

Press twice to program your favorite recipe.

Press once to cook with that recipe.

14. Start

Press to start cooking.

15. Kitchen Timer

Sets kitchen or convenience timer.

16. Pause/Cancel

Press to pause oven or correct a mistake.

17. Help

Press to see help information about the

feature you are using.

18. Vent Fan Turbo/Hi/Low/Off Button

- 5 -

Door

Door Latches

Handle

Ventilation Holes

Oven Light

Safety Interlock Holes

Control Panel

Intake Holes

Glass Tray

Guide Roller

398mm758.9mm

417.25mm

405mm

3-2 Features & External Views

1. Sensor Reheat

2. Power Defrost

Sets weight of food to be defrosted.

3. Sensor Cook Buttons p.11

Sensor settings to cook popular foods.

4. Handy Helper, Kids Meals, Snack Bar

Selects type of dish to be reheated.

5. More/Less

Increase or decrease cooking time.

6. Number Buttons

Set cooking times or amounts and power

levels other than high.

7. Power Level

Press this pad to set a power level other

than high.

8. Clock am/pm

Sets current time

9. Light On/Night/Off Button

10. Turntable On/Off Button

11. One Minute +

Press once for every minute of cooking at

High power.

12. My Choice

Press to set non-cooking feature.

13. Custom Cook

Press twice to program your favorite recipe.

Press once to cook with that recipe.

14. Start

Press to start cooking.

15. Kitchen Timer

Sets kitchen or convenience timer.

16. Pause/Cancel

Press to pause oven or correct a mistake.

17. Help

Press to see help information about the

feature you are using.

18. Vent Fan Turbo/Hi/Low/Off Button

- 6 -

Glass tray Roller guide ring

3-3 Accessary

- 7 -

The Microwave Oven is supported by a special

bracket assembly (mounting system) supplied with

the oven. The bracket assembly must be mounted to

the wall with toggle bolts through the wall, and a lag

screw into a wall stud. After the bracket assembly is

installed, the unit can be slid over the two rails of the

bracket assembly. Two bolts are run down through the

cabinet bottom and into the oven case to pull the oven

up against the cabinet bottom.

NOTE : For easier removal and personal safety it is

recommended that two people remove this

product.

CAUTION!

The mounting surface must be capable of support-

ing the cabinet load, in addition to the 64 pound

product, plus additional loads of up to 50 pounds or a

total weight of 114 pounds. This product cannot be

installed to cabinet arrangements such as an island or

peninsula. It must be mounted to both a top cabinet

and wall.

VENT BLOWER

The vent or exhaust blower is located at the top

of the oven. It is shipped for vertical exhaust but

can be changed to rear exhaust or recirculating

(See installation instrustions on how to change

and/or blower section on how to remove).

COOKTOP LIGHTS

One 40-watt screw base incandescent bulbs are

located on the bottom between the two grease

ﬁlters. The bulbs are user replaceable by removing

one screw and lowering access cover. The bulbs

could be difﬁcult to remove when replaced for the

ﬁrst time. a silicone glue is used to secure them

during shipping.

OVEN LIGHT

A 40-watt screw base incandescent bulb is located

in the top of the oven cavity at the front.

It is user replaceable by removing the top grill

(2 screws. On the front of outer case.). The bulb

is then accessible by removing a metal cover (1

screw).

Mounting Plate

REMOVE SCREWS

3-4 INSTALLATION

- 8 -

The metal ﬁlter trap grease released by foods on

the cooktop. They also prevent ﬂames from foods

on the cooktop from damaging the inside of the

microwave.

For this reason, the ﬁlters must ALWAYS be in

place when the hood the vent fan is used. The

grease ﬁlter should be cleaned once a month, or

as needed.

REMOVING CHARCOAL FILTER

To remove the charcoal ﬁlter, disconnect power

at the main fuse or circuit breaker panel or pull

the plug. Remove the top grille by removing the 2

screws that hold it in place.

Slide the ﬁlter towards the ﬁlter towards the front

of the oven and remove it.

AUTOMATIC FAN

An automatic fan feature protects the microwave

from too much heat rising from the cooktop below

it. If you have turned the fan on you may ﬁnd that

you cannot turn it. The fan will automatically turn

off when the internal parts are cool. If may stay

on for 30 minutes or more after the cooktop and

microwave controls are turned off.

GRILLE REMOVAL

The top full-width grille is removable for service

to some components, such as : oven light, cavity

T.C.O, vent motor capacitor and fuse.

TO REMOVE GRILLE :

1. Disconnect oven power.

2. Remove screws (2) from grille outer case.

3. Lift off grille.

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.

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 remov-

al of last top cabinet bolts.

CAUTION : Oven weights 63.1 lbs. Requires 2

people for removal.

Charcoal Filter

Reusable Grease Filters

Screws

Remove 2 grille screws to remove the grill

3-5 REUSABLE GREASE FILTERS

- 9 -

4. Disassembly and Reassembly

Remove the magnetron including the shield case, permanent magnet, choke coils and capacitors

(all of which are contained in one assembly).

1. Disconnect all lead wires from the magnetron and lamp.

2. Remove a screw securing air cover.

3. Remove the air cover.

4. Remove screws securing the magnetron to the wave guide.

5. Take out the magnetron very carefully.

6. Remove tow from the back panel of fan motor assembly.

7. Take out the fan motor assembly.

8. Remove the oven lamp by rotating to pull out from hole of air cover.

NOTE1: When removing the magnetron, make sure that its antenna does not hit any adjacent parts, or it may

be damaged.

NOTE2: When replacing the magnetron, be sure to remount the magnetron gasket in the correct position and

make sure the gasket is in good condition.

1. Discharge the high voltage capacitor.

2. Disconnect all the leads.

3. Remove the mounting bolts.

4. Reconnect the leads correctly and ﬁrmly.

PRECAUTION

Servicemen should remove their watches when-

ever working close to or replacing the magnetron.

PRECAUTION

There exists HIGH VOLTAGE ELECTRICITY with high current capabilities in the circuits of the HIGH

VOLTAGE TRANSFORMER secondary and ﬁlament terminals. It is extremely dangerous to work on or near

these circuits with the oven energized.

DO NOT measure the voltage in the high voltage circuit including ﬁlament voltage of magnetron.

4-1 Replacement of Magnetron, Motor Assembly and Lamp

4-2 Replacement of High Voltage Transformer

- 10 -

4-3 Replacement of Door Assembly

4-3-1 Removal of Door “C”

Insert ﬂat screw driver into the gap between Door

“A” and Door “C” to remove Door “C”. Be careful

when handling Door “C” because it is fragile.

Then remove the door assembly.

4-3-2 Removal of Door “E”

Following the procedure as shown in the ﬁgure,

insert and bend a thin metal plate between Door

“E” and Door “A” until you hear the ‘tick’ sound.

- Insertion depth of the thin metal plate should be

0.5mm or less.

4-3-3 Removal of Key Door & Spring

Remove pin hinge from Door “E”

Detach spring from Door “E” and key door.

Door "A"

Door "C"

DOOR "E"

Spring

- 11 -

4-3-4 Reassembly Test

The fuse is located behind the control panel mounted

to the installation bracket.

1. Disconnect power and remove grille.

2. Remove a screw that secure the installation

bracket.

1. Disconnect power.

2. Remove the three screws at the assy base bottom.

3. Remove the plastic cover (ﬁxed with a screw) that

covers the motor.

4. Remove all of the wires connected.

5. Remove a screw from the motor.

6. Turn the motor to the right and remove it.

7. After replacing the motor, you should re-install it on

the accurate position of the coupler.

8. Assembling is in the reverse order to disassebling.

1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of the oven face

plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment.

2. Adjust so that the door has no play between the inner door surface and oven front surface. If the door assem

bly is not mounted properly, microwave energy may leak from the space between the door and oven.

3. Do the microwave leakage test.

After replacement of the defective component parts of the door, reassemble it and follow the instruc

tions below for proper installation and adjustment so as to prevent an excessive microwave leakage.

4-5 Replacement of Drive Motor

4-4 Replacement of Main Fuse & H. V. Trans Fuse

DRIVE MOTOR

BASE PLATE

Screw(1)

MAIN FUSE

1. When 20A fuse blows out by the operation of

interlock monitor switch failure, replace the

primary interlock switch, door sensing switch,

interlock monitor switch and power relay.

2. When the above 3 switches operate properly,

check if any other part such as the control

circuit board, blower motor or high voltage

transformer is defective.

H. V. TRANS FUSE

1. When 20 Amp. fuse is blown due to operation of the H. V. Trans fall mode, the H. V. Trans Fuse must be

replaced.

H. V. Trans

FUSE

MAIN FUSE

- 12 -

4-6 Replacement of stirrer motor

1. Disconnect power and remove grille screws(2).

2. Remove grille and the bracket duct upper screw(1).

3. Remove the bracket duct upper and disconnect the

stirrer motor wire.

4. Remove stirrer motor screws(1) and lift up stirrer

motor after turn left.

The stirrer is located on the upper side of the cavity. The oven uses a top feed wave guide.

1. Disconnect power and open the door.

2. Remove the clip and turn the stirrer cover left.

3. Remove stirrer cover and the stirrer will come with

it.

4. Replace the clip if the clip head broken.

CLIP

COVER STIRRER

STIRRER ASSEMBLY

COVER STIRRER

STIRRER MOTOR

4-7 Removal of stirrer

- 13 -

4-8 Replacement of Control Circuit Board

4-8-1 Removal of Control Box

1. Disconnect power and remove grille.

2. Remove a screw securing the control box

assembly.

3. Be sure to ground any static electric charge in

your body and never touch the control circuit.

4. Disconnect the connectors from the control

circuit board.

4-8-2 Removal of P.C.B Assembly

1. Pull the lever end of the plastic fastener and

remove the Flexible Printed Circuit(FPC) of

membrane panel.

2. Remove screws (3) securing the control circuit

board.

3. Lift up the control circuit board from the Ass’y

control box.

4. When reconnecting the FPC connector, make

sure that the holes on the connector are properly

engaged with the hooks on the Plastic Fastener.

FPC

connector

4 Screws

- 14 -

5. Alignment and Adjustments

1. Remove connectors from the transformer terminals

and check continuity.

2. Normal resistance readings are as follows:

SHV-U1870AR

Secondary

Filament

Primary

80.5 Ω +2%

Shows Continuity

1100W 0.330 Ω + 2%

1000W 0.375 Ω + 2%

(Room temperature = 20°C)

PRECAUTION

1. High voltage is present at the high voltage terminals during any cook cycle.

2. It is neither necessary nor advisable to attempt measurement of the high voltage.

3. Before touching any oven components or wiring, always unplug the oven from its power source and dis-

charge the high voltage capacitor.

1. Continuity checks can indicate only an open

ﬁlament or a shorted magnetron. To diagnose an

open ﬁlament or shorted magnetron :

2. Isolate the magnetron from the circuit by

disconnecting its leads.

3. A continuity check across the magnetron ﬁlament

terminals should indicate one ohm or less.

4. A continuity check between each ﬁlament terminal

and magnetron case should read open.

1. The low voltage transformer is located on the

control circuit board.

2. Remove the low voltage transformer from the

PCB Ass’y and check continuity.

3. Normal resistor reading is shown in the table.

Terminals

Resistance

SLV-1350U(P)

1~2(Input)

4~5(Output 2.7V)

6~7(Output 7.0V)

7~8(Output 19.0V)

127.7 Ω

1.8 Ω

2.0 Ω

4.8 Ω

Filament Terminals

Primary

Terminals

Secondary

Terminal

Cooling Fins

Magnetron Antenna

Gasket Plate

5-3 Magnetron

5-2 Low Voltage Transformer

5-1 High Voltage Transformer

- 15 -

1. Isolate the diode from the circuit by disconnecting its leads.

2. With the ohm-meter set at the highest resistance scale, measure across the diode terminals. Reverse the

meter leads and read the resistance. A meter with 6V, 9V or higher voltage batteries should be used to check

the front-to back resistance of the diode (otherwise an inﬁnite resistance may be read in both directions).

The resistance of a normal diode will be inﬁnite in one direction and several hundred KΩ in the other

direction.

5-4 High Voltage Capacitor

1. The relays are located on the PCB Ass’y. Isolate them from the main circuit by disconnecting the leads.

2. Operate the microwave oven with a water load in the oven. Set the power level set to high.

3. Check continuity between terminals of the relays after the start pad is pressed.

1. Check continuity of the capacitor with the meter set at the highest resistance scale.

2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9MΩ.

3. A shorted capacitor will show continuous continuity.

4. An open capacitor will show constant 9MΩ.

5. Resistance between each terminal and chassis should read inﬁnite.

1. When mounting Primary switch and Interlock Moni-

tor switch to Latch Body, consult the ﬁgure.

2. No speciﬁc adjustment during installation of Pri

mary switch and Monitor switch to the latch body is

necessary.

3. When mounting the Latch Body to the oven assem-

bly, adjust the Latch Body by moving it so that the

oven door will not have any play in it. Check for play

in the door by pulling the door assembly. Make sure

that the latch keys move smoothly after adjustment

is completed. Completely tighten the screws holding

the Latch Body to the oven assembly.

4. Reconnect to Monitor switch and check the continu-

ity of the monitor circuit and all latch switches again

by following the components test procedures.

5. Conﬁrm that the gap between the switch housing

and the switch actuator is no more than 0.5mm

when door is closed.

6. Interlock Switch Replacement - When replacing

faulty switches, be sure switch mounting tabs are

not bent, broken or otherwise deﬁcient in their abil-

ity to secure the switches in place.

Door Open Door Closed

Primary Interlock S/W

Monitor switch(COM-NC)

Door Sensing S/W

(Secondary Interlock S/W)

∞

PRECAUTION

For continued protection against radiation hazard, replace parts in accordance with the wiring diagram and be sure

to use the correct part number for the following switches: Primary and secondary interlock switches, and the inter-

lock monitor switch (replace all together). Then follow the adjustment procedures below. After repair and adjust-

ment, be sure to check the continuity of all interlock switches and the interlock monitor switch.

Primary Interlock Switch

Interlock Monitor

Switch

Body Latch

5-5 High Voltage Diode

5-6 Main Relay and Power Control Relay

5-7 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch

Door Sensing Switch

(Secondary

Interlock Switch)

Lever Switch(A)

- 16 -

5-8 Vent Exhaust Blower Motor

THIS COMPONENT REQUIRE REMOVAL OF

MICROWAVE OVEN FROM INSTALLATION FOR

SERVICING.

The blower is a two speed (HI-LO) capacitor run

blower assembly located on top of the micro-

wave oven. The blower is operated by low

voltage relays located on the smart board.

The blower motor has 3 winding which can be

tested for continuity from the front by removing

the top grille and opening the control panel.

RUN CAPACITOR

The run capacitor is located behind the top

grille above the control area. The capacitor is

used for more torque and electrical phasing.

Without the capacitor the blower might run but

would be much slower.

TO TEST THE CAPACITOR

1. Remove grille, discharge capacitor and disconnect

one capacitor lead.

2. Make appropriate capacitor check (with analog

meter needle should rise then fall, cap is charging

then discharging).

TO TEST BLOWER WINDINGS:

1. Disconnect power and remove grille.

2. Open control panel and discharfe capacitor.

3. Disconnent two wires to run capacitor. Continuity

test across the two wires should ve approximately

75 ohms of resistance. This test allows you to read

across all three windings at the same time.

TO REMOVE VENT BLOWER

1. Remove unit from its installation.

2. Remove 5 screws securing damper and motor as-

sembly to top and back of unit and lift off.

(1 screw is located under damper.)

3. Disconnect blower plug.

NOTE: Place blower wires in routing slots to avoid

pinching of wires.

Damper ASM

Blower ASM

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Samsung SMH7175WE Operating instructions

Brand: Samsung

Model: SMH7175WE

Category: Microwaves

Type: Operating instructions

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Samsung SMH7175WE Operating instructions

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Samsung SMH7175WE Operating instructions

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