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15

31

XOUT

OUT

Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.

32

VSS

IN

Power source voltage: -5.0V.
VC voltage of power source circuit input.

33

P27

OUT

Terminal not used.

34

P26

OUT

Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G7 line keys on key matrix is touched.

35

P25

OUT

Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G6 line keys on key matrix is touched.

36

P24

OUT

Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G5 line keys on key matrix is touched.

37

P23

OUT

Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G4 line keys on key matrix is touched.

38

P22

OUT

Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G3 line keys on key matrix is touched.

39

P21

OUT

Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G2 line keys on key matrix is touched.

40

P20

OUT

Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G1 line keys on key matrix is touched.

41-50

P17-P08

OUT

Terminal not used.

51-72

SEG21-SEG0

OUT

Segment data signal.
Connected to LCD.
The relation between signals are as follows:

LSI signal (Pin No.)

LCD (Pin No.)

LSI signal (Pin No.)

LCD (Pin No.)

SEG 21 (51) ................... SEG21 ( 1)

SEG 10 (62) ................... SEG10 (12)

SEG 20 (52) ................... SEG20 ( 2)

SEG   9 (63) .................... SEG 9 (13)

SEG 19 (53) ................... SEG19 ( 3)

SEG   8 (64) .................... SEG 8 (14)

SEG 18 (54) ................... SEG18 ( 4)

SEG   7 (65) .................... SEG 7 (15)

SEG 17 (55) ................... SEG17 ( 5)

SEG   6 (66) .................... SEG 6 (16)

SEG 16 (56) ................... SEG16 ( 6)

SEG   5 (67) .................... SEG 5 (17)

SEG 15 (57) ................... SEG15 ( 7)

SEG   4 (68) .................... SEG 4 (18)

SEG 14 (58) ................... SEG14 ( 8)

SEG   3 (69) .................... SEG 3 (19)

SEG 13 (59) ................... SEG13 ( 9)

SEG   2 (70) .................... SEG 2 (20)

SEG 12 (60) .................. SEG12 (10)

SEG   1 (71) .................... SEG 1 (21)

SEG 11 (61) .................. SEG11 (11)

SEG   0 (72) .................... SEG 0 (22)

73/74 VCC/VREF

IN

Connected to GND.

75

AVSS

IN

Connected to VC.

76

COM3

OUT

Terminal not used.

77

COM2

OUT

Common data signal: COM2.
Connected to LCD signal COM2.

78

COM1

OUT

Common data signal: COM1.
Connected to LCD signal COM1.

79

COM0

OUT

Common data signal: COM0.
Connected to LCD signal COM0.

80

VL3

IN

Standard voltage for LCD.

16

This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following
precautions should be strictly followed. CMOS LSI
have extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electric-
ity charge in clothes, etc. and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.

1) When storing and transporting, thoroughly wrap them

in aluminium foil. Also wrap all PW boards containing
them in aluminium foil.

2) When soldering, ground the technician as shown in the

figure and use grounded soldering iron and work table.

We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so. To perform
the servicing, power to the touch control panel is
available either from the power line of the oven itself or
from an external power source.

ply of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE MI-
CROWAVE OVEN IS STILL LIVE DURING SERVIC-
ING PRESENTS A HAZARD.
Therefore, when checking the performance of the
touch control panel, put the outer cabinet on the oven
to avoid touching the high voltage transformer, or
unplug the primary terminal (connector) of the high
voltage transformer to turn it off; the end of such
connector must be insulated with an insulating tape.
After servicing, be sure to replace the leads to their
original locations.

A. On some models, the power supply cord between the

touch control panel and the oven itself is so short that
the two can’t be separated.
For those models, check and repair all the controls
(sensor-related ones included) of the touch control
panel while keeping it connected to the oven.

B. On some models, the power supply cord between the

touch control panel and the oven proper is long enough
that they may be separated from each other. For those
models, therefore, it is possible to check and repair the

controls of the touch control panel while keeping it
apart from the oven proper; in this case you must short
both ends of the door sensing switch (on PWB) of the
touch control panel with a jumper, which brings about
an operational state that is equivalent to the oven door
being closed. As for the sensor-related controls of the
touch control panel, checking them is possible if dummy
resistor(s) with resistance equal to that of the controls
are used.

from an external power source:
Disconnect the touch control panel completely from
the oven proper, and short both ends of the door
sensing switch (on PWB) of the touch control panel,
which brings about an operational state that is
equivalent to the oven door being closed. Connect an
external power source to the power input terminal of
the touch control panel, then it is possible to check and
repair the controls of the touch control panel it is also
possible to check the sensor-related controls of the
touch control panel by using the dummy resistor(s).

Tools required to service the touch control panel
assembly.

1) Soldering iron: 30W

(It is recommended to use a soldering iron with a
grounding terminal.)

2) Oscilloscope: Single beam, frequency range: DC-

10MHz type or more advanced model.

3) Others: Hand tools

5. Other Precautions
1) Before turning on the power source of the control unit,

remove the aluminium foil applied for preventing static
electricity.

2) Connect the connectors of the key unit to the control

unit being sure that the lead wires are not twisted.

3)  After aluminium foil is removed, be careful that abnor-

mal voltage due to static electricity etc. is not applied
to the input or output terminals.

4) Attach connectors, electrolytic capacitors, etc. to PWB,

making sure that all connections are tight.

5) Be sure to use specified components where high

precision is required.

approx. 1M ohm

Transistor
DTA143ES
DTD143ES

Transistor
2SB1238

17

cavity, referring to "POWER SUPPLY CORD
REPLACEMENT".

5. Disconnect the wire leads from the turntable motor,

thermal cut-out (oven), thermal cut-out (MG.), all
switches on the latch hook, magnetron and oven lamp.

6. Release the two (2) snap bands of the main wire

harness from the oven cavity and the lamp angle.

7. Remove the two (2) screws holding the front leg to the

base plate.

8. Remove the front leg from the oven cavity by releasing

the three (3) tabs.

7. Lift entire outer case from the unit.

NOTE: Setps 1, 2 and 3 form the basis of the 3D checks.

CAUTION: 1. DISCONNECT OVEN FROM POWER SUP

PLY BEFORE REMOVING OUTER CASE.

2. TO DISCHARGE THE HIGH VOLTAGE

CAPACITOR WAIT FOR 60 SECONDS
BEFORE TOUCHING ANY OVEN COM-
PONENTS OR WIRING.

1. Disconnect oven from power supply.
2. Visually check the door and cavity face plate for damage

(dents, cracks, signs of arcing etc.).

Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or damaged.

4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective  parts in the microwave generating

and transmission assembly.

7. There is visible damage to the oven.

Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.

Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal
procedures:

To prevent an electric shock, take the following
manners.
1. Before wiring,

1) Disconnect the power supply.
2) Open the door and wedge the door open.
3) To discharge the high voltage capacitor, wait for

60 seconds.

2. Don't let the wire leads touch to the following parts;

1) High voltage parts:

Magnetron, High voltage transformer, High
voltage capacitor, High voltage rectifier assembly
and High voltage fuse.

2) Hot parts:

Oven lamp, Magnetron, High voltage transformer
and Oven cavity.

3) Sharp edge:

Bottom plate, Oven cavity, Waveguide flange,
Angles, Guides and other metallic plate.

4) Movable parts (to prevent a fault)

Fan blade, Fan motor, Switch.

3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector certainly until its

pin is locked. And make sure that the wire leads
should not  come off even if the wire leads is pulled.

5. To prevent an error function, connect the wire leads

correctly, referring to the Pictorial Diagram.

To remove the outer case, proceed as follows.
1. Disconnect the oven from power supply.
2. Open the oven door and wedge it open.
3. To discharge the high voltage capacitor, wait for 60

seconds.

4. Remove the five (5) screws from the the rear cabinet.
5. Remove the  two (2) screws along the right and left

sides of outer case.

6. Slide the entire outer case back out about 2.5 cm to free

it from retaining clips on the cavity face plate.

Before removal of the high voltage transformer, high
voltage capacitor, high voltage rectifier, magnetron, high
voltage fuse, fan motor and turntable motor, the oven
cavity must be removed from base plate as follows.
Removal
1. CARRY OUT 3D CHECKS.
2. Remove the outer case  (refer to "OUTER CASE

REMOVAL").

3. It is recommended that the door is removed from the

oven cavity. Refer to "DOOR REPLACEMENT".

4. Remove the the power supply cord  from the oven

18

9. Remove the two (2) screws holding the waveguide

flange of the oven cavity to the base plate.

10.Remove the three (3) screws holding the base plate to

the oven cavity front plate.

11.Remove the three (3) screws holding the base plate to

the oven cavity back plate.

12.Lift up the oven cavity assembly and remove it from the

base plate.

13.Now the high voltage transformer, high voltage

capacitor, high voltage rectifier, high voltage fuse and
fan motor can be found on the base plate.

14.The magnetron can be found at wavegide flange of the

oven cavity.

15. The turntable motor can be found under the oven

cavity bottom plate.

Reinstallation
1. Make sure that the electrical parts on the base plate are

reinstalled at their positions.

2. Make sure that the wire leads are reconnected to their

correct positions. Refer to the "PICTORIAL DIAGRAM".

3. Reinstall the oven cavity assembly on the base plate.

4. Hold the base plate to the oven cavity back plate with

three (3) screws.

5. Hold the base plate to the oven cavity front plate with

three (3) screws.

6. Hold the waveguide flange of the oven cavity to the

base plate with two (2) screws.

7. Reinstall the front leg to the oven cavity front plate.
8. Hold the front leg to the base plate with two (2) screws.
9. Insert the two (2) snap bands of main wire harness to

the two (2) holes of oven cavity.

10. Reconnect the wire leads to the magnetron, all switches,

thermal cut-out (MG.), thermal cut-out (oven.), oven
lamp and turntable motor. Refer to the "PICTORIAL
DIAGRAM".

11.Reinstall the power supply cord to the oven cavity,

referring to "POWER SUPPLY CORD
REPLACEMENT".

12.If the door has been removed, reinstall the door to the

oven cavity. Refer to "DOOR REPLACEMENT".

13.Now, the oven cavity assembly should be reinstalled.

1. CARRY OUT 3D CHECKS.
2. Remove the outer case.
3. Remove the oven cavity assembly from the base plate.

Refer to "OVEN CAVITY ASSEMBLY REMOVAL".

4. Disconnect the wire leads (primary and high voltage

fuse) from high voltage transformer and the filament
leads from the magnetron and capacitor terminals.

5. Remove four (4) screws holding transformer to base

plate.

6. Remove transformer from base plate.

Reinstallation
1. Rest transformer on the base plate with its primary

terminals toward the left side.

2. Secure transformer with four screws to base plate.
3. Re-connect wire leads (primary and high voltage fuse)

to high voltage transformer and filament leads of
transformer to magnetron and high voltage capacitor.
Refer to "PICTORIAL DIAGRAM".

4. Reinstall the oven cavity assembly to the base plate.

Refer to "OVEN CAVITY ASSEMBLY REMOVAL".

5. Re-install outer case and check that oven is operating

properly.

1. CARRY OUT 3D CHECKS.
2. Remove the outer case.
3. Remove the oven cavity assembly from the base plate.

Refer to "OVEN CAVITY ASSEMBLY REMOVAL".

4. Disconnect the high voltage fuse from the high voltage

capacitor and the high voltage transformer.

5. Now the high voltage fuse is free.
6. Disconnect the filament lead (short one) of the high

voltage transformer from the high voltage capacitor.

7. Remove one (1) screw holding capacitor holder to

base plate.

8. Remove  one (1) screw holding high voltage rectifier

assembly to capacitor holder.

9. Disconnect rectifier terminal from the capacitor.

High voltage rectifier assembly is now free.

10.Remove the capacitor holder. The capacitor is now

free.

CAUTION: WHEN REPLACING HIGH VOLTAGE REC-

TIFIER AND HIGH VOLTAGE CAPACITOR,
EARTH SIDE TERMINAL OF THE HIGH
VOLTAGE RECTIFIER MUST BE SECURED
FIRMLY WITH A EARTHING SCREW.

Removal
1. CARRY OUT 3D CHECKS.
2. Remove the outer case.
3. Remove the oven cavity assembly from the base plate.

Refer to "OVEN CAVITY ASSEMBLY REMOVAL".

4. Now, the wire leads should be disconnected from the

magnetron and thermal cut-out (MG).

5. Carefully remove the four (4) screws holding magnetron

to waveguide flange.

6. Remove magnetron with care so that magnetron

antenna is not hit by any metal object around  antenna.

7. Remove the two (2) screws holding the magnetron

duct assembly to the magnetron.

8. Remove the magnetron duct assembly with thermal

cut-out (MG) from magnetron.

9. Now, the magnetron is free.
Reinstallation
1. Re-install the magnetron thermal duct assembly with

thermal cut-out (MG) to magnetron with the two (2)
screws.