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23

28-29

P71-P70

OUT

Terminal not used.

30

XIN

IN

Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.

31

XOUT

OUT

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

32

VSS

IN

Power source voltage: -5V.
VC voltage of power source circuit input.

33

P27

OUT

To turn on and off the shut-off relay  (RY1).
The Square waveform voltage is delivered to
the RY1 relay driving circuit and  relays
(RY2, RY3, COOK RELAY) control circuit.

34

P26

OUT

Terminal not used.

35-36

P25-P24

OUT

To turn on and off the cook relay. In100% power level operation, "L" level during
cooking; "H" level otherwise. In other power level operation (50, 20 or 10%), "H" and
"L" level is repeated according to power level.

P0WER LEVEL

ON

OFF

50%

26sec.

22sec.

20%

12sec.

36sec.

10%

  8sec.

40sec.

37-38

P23-P22

OUT

Terminal not used.

39-48

P21-P10

OUT

The relation between signals and indicators are as follows:

Signal

Segment

Signal

Segment

P01 ............. i

P15 .............. f

P00 ............. j, k

P14 .............. e

P21 ............. LB

P13 .............. d

P20 ............. UB

P12 .............. c

P17 ............. h

P11 .............. b

P16 ............. g

P10 .............. a

49-54

P07-P02

OUT

The relation between digit signal and digit
are as follows:

Digit signal

Digit

P07 ............. 1st.

P06 ............. 2nd.

P05 ............. 3rd.

P04 ............. 4th.

P03 ............. 5th.

P02 ............. 6th.

Normally, one pulse is output in every ß
period, and input to the grid of the Fluo-
rescent Display.

55-56

P01-P00

OUT

Segment data signal.
Signal similar to P21.

57-64

P37-P30

OUT

Terminal not used.

H

L

20 msec

During cooking

GND

-5V

48 sec.

OFF

ON

GND

-31(V)

ß(50Hz)

H

L

GND

VP

ß(50Hz)

P07

P06

P05

P04

P03

P02

GND

VP

24

AT24C04 is a 4K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 512
registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal for IC2
are as shown in the following diagram.

1-3

A0-A2

IN

Connected to GND.

4

VSS

IN

Connected to VC(-5V).

5

SDA

IN/OUT

Serial data input/output : input/outputs data to IC1.

6

SCL

IN

Clock signal input : input/outputs serial data at every one pulse.

7

TEST

IN

Connected to VC(-5V).

8

VCC

IN

Connected to GND.

A0

8

1

7

2

6

3

5

4

A1

A2

VSS

VCC

TEST

SCL

SDA

TOP VIEW

FUNCTIONAL DIAGRAM

E  PROM

512 x 8

2

START

STOP

LOGIC

CONTROL

LOGIC

SLAVE ADDRESS

REGISTER

COMPARATOR

H.V. GENERATION

TIMING

& CONTROL

64

YDEC

8

DATA REGISTER

Dout

CK

3

1

5

64

XDEC

START CYCLE

INC

LOAD

WORD

ADDRESS
COUNTER

R/W

PIN

Dout
ACK

(6) SCL

(5) SDA

(4) Vss

(3) Vcc

25

approx. 1M ohm

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.

(2)Servicing the touch control panel with power supply 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 assem-
bly.

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 connector 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 abnormal

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 preci-

sion is required.

This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following pre-
cautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output termi-
nals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
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 avail-
able either from the power line of the oven itself or from
an external power source.

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 trans-
former 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

T

i t

Transistor
2SA933ASTP
DTA114YSA
DTB143ES
DTD143ES
KRA101M

Transistor
2SB1238

Transistor
2SB953

26

When the control unit or IC-2 is exchanged, re-enter the
constans of EXPRESS DEFROST, the memory information
and the EEPROM data, referring to the following procedures.
If not so, the oven will not operate correctly.

1) How to enter the constants of EXPRESS DEFROST.

T = STG1 + STG2 + STG3
STG = A X T + B
STG1= 0.20 X T + 20 Power level 50%
STG2= 0.13 X T + 30 Power level 30%
STG3= 0.67 X T - 50 Power level 20%

"       " : Flicker /    : 0.1 sec BUZZER

PAD ORDER

DISPLAY

PHONE

(Door close)

SET

SET

"NUMBER"

(within 2 sec.)

#1

 START

"NUMBER"

EXPRESS DEFROST

1

0.00 DEF

2, 0

1

0.20 DEF

  x 2

 (A)

MANUAL/ REPEAT

1

0 DEF

2

1

     0.20 DEF

#2

 (+ - B)

DEF "POWER"

 

POWER SETTING

1

    20

100%

DEF

POWER

5

1

    20

50%

MANUAL/ REPEAT

 2

0.00 DEF

1, 3

2

0.13 DEF

  x 2

 (A)

MANUAL/ REPEAT

2

     0 DEF

3

2

       30 DEF

(+ -  B)

DEF "POWER"

 POWER SETTING

2

    30

100%

DEF

POWER

3

2

    30

30%

MANUAL/ REPEAT

 3

     0 DEF

#3

 5

3

        5 DEF

"CHECK"

DEF "POWER"

 POWER SETTING

3

5

100%

DEF

POWER

2

3

5

20%

SET

 4

     •  DEF

SET

     •

#1: No key entry signal.
#2: To set -B, touch the POWER SETTING key twice.
#3: Ex. "CHECK" will flash and the oven will beep after 50%

of EXPRESS DEFROST time has lapsed when 5 key is
entered.

Constants of
EXPRESS
DEFROST.

Example: Suppose cooking time 5 sec. and output power

100% are entered into the memory pad 1.

The following procedure enables the servicer to obtain the
total service counts (cook cycles) for memory cooking, manual,
repeat, double quantity cooking and defrost. The maximum
capacity of the counter is 999,999 counts, above which the
counter will reset to "0". The counter will retain the total counts
(will not clear) in the event of a power disruption.

1) Practice for checking total service counts
     (eg; 234,567 Counts).

         --- flashing /      ---0.1sec. BUZZER

PAD

DISPLAY

INDICATOR LED PHONE

(door close)

•

•

CHECK

NUMBER

•

CHECK

CHECK

#1

82 68

CHECK

(user total count)

#2

VOLUME

VOLUME

DOUBLE

2 34 56 7

QUANTITY

(service total count)

1

NUMBER

1

(after 1 sec.)

45

(filter used time)

2

NUMBER

2

(after 1 sec.)

2 00

(filter lim. time)

0 (No 10)

NUMBER 10

(after 1 sec.)

35 43 2

(service total cook time)

CHECK

•

#1: Denotes total service counts within the reach of user, of

which checking and clearing practices are described in
this instruction manual.

#2: Denotes the procedure for the servicer to disable check-

ing/clearing. This procedure is instructed to service per-
sonnel only and is excluded from the operation manual.

2) Practice for clearing Service's counts

"       " : Flicker /    : 0.1 sec BUZZER

PAD ORDER

DISPLAY

PHONE

(Door close)

CHECK

"NUMBER"

•          CHECK

CHECK

          82 68     "CHECK"

(User's Total Counts)

#1 VOLUME

82 68     "CHECK"

VOLUME

          82 68     "CHECK"

DOUBLE QUANTITY

   2 34 56 7  "CHECK"

          (Total Counts Service)

SET

0   "CHECK"

0

0   "CHECK"

SET

         0   "CHECK"

CHECK

#1: Denotes the procedure for the servicer to disable clearing.

This procedure is instructed to service personnel only and
is excluded from the operation manual.