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R-654M -13

Ensure the following:

1.

Wires must not touch:

a)

High voltage parts.
(Magnetron, high voltage transformer, high voltage capacitor and high voltage rectifier assembly)

b)

Parts that become hot.
(Heating elements, oven lamp, oven cavity magnetron and high voltage transformer)

c)

Sharp edges.
(Bottom plates, oven cavity, waveguide flange, chassis support and other metallic parts)

d)

Movable parts.
(Fan blade, any motor, switch, switch lever and open button)

2.

Positive lock connectors are fitted correctly.  Ensure the locking pin is located correctly.

3.

Wires are connected correctly as per pictorial diagram.

4.

No wire leads are trapped by the outer wrap.

WARNING: Before carrying out any work carry out 3D checks

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge high voltage capacitor.

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 275ml is 50 W/m

 (equivalent to

5mW/cm

) at a distance of 5cm from the oven.

The following items are required to carry out this test:-
1.

A low form of 600ml beaker made from

electrically non-conductive material, such as
glass or plastic, with an inside diameter of
approximately 8.5cm. This must contain 275 

±

15ml 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 Laboratory Standards.

Recommended instruments are:

Apollo "XI"
Celtec "A1000"

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

Dotted line indicates the path taken by the leakage detector.

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

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.

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

a)

around the edge of the door following the gap

b)

across the face of the door

c)

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

R-654M -14

CIRCUIT SUBJECT TO CHANGE

WITHOUT NOTICE.

DOOR CLOSED

COOK OFF CONDITION

Note:
AC CORD CONNECTION
BRN : BROWN
BLU : BLUE
G-Y : GREEN AND YELLOW STRIPE

NOTE:

* INDICATES COMPONENTS

WITH POTENTIALS

ABOVE 250V

LINE CROSS CAPACITOR

0.22

µ

F/AC250V

 HVT THERMOSTAT

 150

0

c - 96

0

c

MODEL : R-64STM

0.94

µ

F

230-240V

SWITCH

STOP

CONTROL

TURNTABLE

OVEN

MOTOR

FAN

MOTOR

LAMP

NO

COM.

RY1

UNIT

COM.

A3

A1

RY2

RY3

TTM

FM

OL

AC2100V

F8A

FUSE

20A

MONITOR
SWITCH

OVEN

Z

50H

BRN

/18

BLU

/18

CUT OUT

THERMAL

B2

B1

HEATER

10M/0.5 SW

G-Y/18

EARTH

FUSE

*

CAPACITOR

*

RECTIFIER

TRANSFORMER

*

POWER

*

MAGNETRON

RESISTOR 680K/0.5SW

UNIT

FILTER

NOISE

NOISE SUPPRESSION COIL

DIAGRAM

SCHEMATIC

NO

LATCH
SWITCH

MONITORED

SW2

      SW1

SW3

LINE BYPASS

CAPACITOR

0.0047

µ

F/AC250V

LINE BYPASS

CAPACITOR

0.0047

µ

F/AC250V

NO

NO

NC

NO

R-654M -15

BLK

OVEN LAMP 

FM:

FAN MOTOR

BLU

WHT

BLK

BLU

HIGH VOLTAGE COMPONENTS

H.V.WIRE B

MG:

MAGNETRON

H.V.WIRE A

C: 

H.V. 

CAPACITOR

H.V.

RECTIFIER

T: HIGH VOLTAGE

    TRANSFORMER

NOISE FILTER

POWER SUPPLY CORD

F8A

FUSE

RED

RED

BRN

BLU

G/Y

3

2

1

COM

WHT

NO

NO

COM

SW3

STOP

SWITCH

NO

COM

GH:

GRILL HEATING 

ELEMENT

N

L

WHT

3

1

COM

NO

COM

NO

CN-B

RY3

RY2

GRN

BLU

BLU

BRN

TURNTABLE

MOTOR

RED

SW2

MONITOR

SWITCH

SW1

LATCH

SWITCH

BLK

BRN

BRN

BLK

CN-A

1

2

RED

GRN

W

H

T

B

L

K

B

R

N

B

L

K

B

L

U

B

R

N

B

L

U

B

L

K

B

L

U

W

H

T

B

L

K

W

H

T

W

H

T

R

E

D

LIVE

NEUTRAL

EARTH

  THERMAL

         CUT-OUT

     150

°

C(OVEN)

WHT

BRN

20A

FUSE 

BLU

NO

COM

RY1

1

2

BRN

NC

CPU/DISPLAY

W

H

T

BRN

BRN

R

E

D

W

H

T

R-654M -16

+

–

B 1

C 1

C 2

C 3

C 4

C 6

C 7

C 5

C 8

C 9

C11

C12

B 2

A 1

A 3

NO

COM

NO

COM

STOP
SWITCH

STOP
SWITCH

NC

GND

VC

BUZZER

VR

INT

CN-C

13 WIRE HARNESS

AC230-240V
50Hz

OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR

HIGH
VOLTAGE
TRANSFORMER

GRILL
HEATING
ELEMENT

R3
130 1w

D1
S1NB10

R1 430 2w

R2 470 1w

T1

3

1

4

6

GND

a

b

c

d

VRS1

C1 470

µ

/50v

SP1

(J1)

10G471K

RY1

RY3

C10

C13

NO

COM

RY2

CN-B

CN-A