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R65

8WM

12 – 1

R657(W)

Service Manual

 

After any repair, the microwave oven must be checked for microwave leakage to ensure continued safe operation. BS EN 60335-2-25 specifies that
the maximum permitted leakage with a load of 275 ml is 50 W/m

2

 (equivalent to 5 mW/cm

2

) at a distance of 5 cm from the oven.

The following items are required to carry out this test:

1. A low form of 600 ml beaker made from an electrically non-conductive material, such as glass or plastic, with an inside diameter of approximately

8.5 cm. This must contain 275 

± 15 ml of water, at an initial temperature of 20 ± 2°C.

2. A leakage detector which has been calibrated within the preceding 12 months to a stand whose accuracy can be traced to National Physical Lab-

oratory Standards.

Recommended instruments are:-

Apollo “XI”

Celtec “A100”

Before commencing the test, check that the leakage detector is functioning and adjusted according to the manufacturer's instructions, and any spac-
ers are fitted to ensure that measurement is taken 5cm from the surface of the oven.

1. Place the beaker containing the water load in the oven cavity at the centre of the turntable. The placing of this standard load in the oven is impor-

tant, not only to protect the oven, but also to ensure that any leakage it is not disguised by too large a load absorbing energy.

2. 2.Close the oven door, and with the power level set to FULL, turn the oven ON with the timer set for a few minutes operation. Should the water

begin to boil before the test has been completed, it should be replaced.

3. 3.As shown in the diagram below, move the probe slowly (not faster than 2.5 cm/sec.);-

1) around the edge of the door following the gap

2) across the face of the door

3) across any vents in the oven's sides, rear or top

Dotted line indicates the path taken by the leakage detector.

R65

8WM

13 – 1

R657(W)

Service Manual

 

Figure O-1 Oven Schematic-OFF Condition

Figure O-2 Oven Schematic-Microwave cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. PLUGGED IN OVEN.

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME ENTERED.
3. START KEY TOUCHED.

MAGNETRON

H.V.

RECTIFIER

H.V.

CAPACITOR

0.97μ

F/

AC2100V

TURNTABLE

MOTOR

FAN

MOTOR

OVEN

LAMP

THERMAL CUT-OUT
145ºC (OVEN)

THERMAL CUT-OUT
145ºC (MG)

MONITORED
LATCH SWITCH

A1

OL

FM

TTM

EARTH

BLU

BRN

LIVE

NEUTRAL

G-Y

FUSE
20A

FUSE F8A

N

L

0.22μ

/AC250V

10M/

0.5W

680k

0.5W

NOISE FILTER

230

-

240V

50Hz

A3

B2

A5

B1

RY1

RY2

RY4

COM.

N.O.

STOP SWITCH

0.0047μ

F/

AC250V

0.0047μ

F/

AC250V

HEATING

ELEMENT

MONITOR

SWITCH

ASYMMETRIC
RECTIFIER

RY3

CONTROL UNIT

HIGH VOLTAGE
TRANSFORMER

THERMAL CUT-OUT
145ºC (MG)

EARTH

BLU

BRN

LIVE

NEUTRAL

G-Y

FUSE
20A

FUSE F8A

N

L

0.22μ

/AC250V

10M/

0.5W

680k

0.5W

NOISE FILTER

230

-

240V

50Hz

0.0047μ

F/

AC250V

0.0047μ

F/

AC250V

MAGNETRON

H.V.

RECTIFIER

H.V.

CAPACITOR

0.97μ

F/

AC2100V

TURNTABLE

MOTOR

FAN

MOTOR

OVEN

LAMP

THERMAL CUT-OUT
145ºC (OVEN)

MONITORED
LATCH SWITCH

A1

OL

FM

TTM

A3

B2

A5

B1

RY1

RY2

RY4

COM.

N.O.

STOP SWITCH

HEATING

ELEMENT

MONITOR

SWITCH

ASYMMETRIC
RECTIFIER

RY3

CONTROL UNIT

HIGH VOLTAGE
TRANSFORMER

R65

8WM

13 – 2

Figure O-3 Oven Schematic-Grill cooking Condition

Figure O-4 Oven Schematic-Dual Grill cooking Condition

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME ENTERED.
3. TOUCH GRILL KEY.
4. START KEY TOUCHED.

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME ENTERED.
3. TOUCH DUAL GRILL KEY.
4. START KEY TOUCHED.

THERMAL CUT-OUT
145ºC (MG)

EARTH

BLU

BRN

LIVE

NEUTRAL

G-Y

FUSE
20A

FUSE F8A

N

L

0.22μ

/AC250V

10M/

0.5W

680k

0.5W

NOISE FILTER

230

-

240V

50Hz

0.0047μ

F/

AC250V

0.0047μ

F/

AC250V

MAGNETRON

H.V.

RECTIFIER

H.V.

CAPACITOR

0.97μ

F/

AC2100V

TURNTABLE

MOTOR

FAN

MOTOR

OVEN

LAMP

THERMAL CUT-OUT
145ºC (OVEN)

MONITORED
LATCH SWITCH

A1

OL

FM

TTM

A3

B2

A5

B1

RY1

RY2

RY4

COM.

N.O.

STOP SWITCH

HEATING

ELEMENT

MONITOR

SWITCH

ASYMMETRIC
RECTIFIER

RY3

CONTROL UNIT

HIGH VOLTAGE
TRANSFORMER

THERMAL CUT-OUT
145ºC (MG)

EARTH

BLU

BRN

LIVE

NEUTRAL

G-Y

FUSE
20A

FUSE F8A

N

L

0.22μ

/AC250V

10M/

0.5W

680k

0.5W

NOISE FILTER

230

-

240V

50Hz

0.0047μ

F/

AC250V

0.0047μ

F/

AC250V

MAGNETRON

H.V.

RECTIFIER

H.V.

CAPACITOR

0.97μ

F/

AC2100V

TURNTABLE

MOTOR

FAN

MOTOR

OVEN

LAMP

THERMAL CUT-OUT
145ºC (OVEN)

MONITORED
LATCH SWITCH

A1

OL

FM

TTM

A3

B2

A5

B1

RY1

RY2

RY4

COM.

N.O.

STOP SWITCH

HEATING

ELEMENT

MONITOR

SWITCH

ASYMMETRIC
RECTIFIER

RY3

CONTROL UNIT

HIGH VOLTAGE
TRANSFORMER

R65

8WM

13 – 3

BLU

G-Y

BRN

EARTH

Noise

filter

RED

N

F2

F1

TP

TL

L

WHT

RED

RED

BLK

WHT

THERMAL

CUT-OUT(MAG)

THERMAL

CUT-OUT(OVEN)

OVEN

LAMP

COM

GRY

BLK

WHT

N.C.

SWITCH

STOP

NO

COM

GRILL

HEATING

ELEMENT

WHT

WHT

WHT

RED

GRN

GRN

GRN

RED

RED

TURNTABLE

MOTOR

MONITOR

SWITCH

MONITORED

LATCH

SWITCH

BLK

BLK

ORG

ORG

RED

ORG

BRN

RED

RED

CN-B

CN-A

ORG

WHT

1B

L

K

2

3W

H

T

GRY

4

5

2

GRN

1

RED

FAN

MOTOR

POWER

SUPPLY

CORD

HIGH

VOLTAGE

COMPONENTS

RY2

RY4

RY3

CONTROL

PANEL

CN-A

T1

CN-B

CN-G

1

1

2

5

RY1

MAGNETRON

Black

Tube

White

wire

Black

Tube

H.V.WIRE

ASYMMETRIC

RECTIFIER

H.V.

CAPACITOR

H.V.

RECTIFIER

HIGH

VOLTAGE

TRANSFORMER

RED

WHT

BRN

GRY

GRY

BLK

RED

BLK

BLK

GRY

RED

NO

COM

GRY

WHT

WHT

WHT

WHT