Sharp R-930AW service manual Pin No, Description, Magnetron high-voltage circuit driving, signal

R-930AK

R-930AW

Pin No.

Signal

I/O

Description

17

P51

OUT

Magnetron high-voltage circuit driving

VARI MODE

ON TIME

OFF TIME

signal.

P-HI (100% power)

32 sec.

0 sec.

To turn on and off the cook relay(RY2). In

P-90 (approx. 90% power)

30 sec.

2 sec.

P-80 (approx. 80% power)

26 sec.

6 sec.

P-HI operation, the signals holds "L" level

P-70 (approx. 70% power)

24 sec.

8 sec.

during microwave cooking and "H" level

P-60 (approx. 60% power)

22 sec.

10 sec.

while not cooking. In other cooking modes

P-50 (approx. 50% power)

18 sec.

14 sec.

(P-90, P-80, P-70, P-60, P-60, P-50, P-40,

P-40 (approx. 40% power)

16 sec.

16 sec.

P-30, P-20, P-10, P-0) the signal turns to

P-30 (approx. 30% power)

12 sec.

20 sec.

"H" level and "L" level in repetition accord-

P-20 (approx. 20% power)

8 sec.

24 sec.

P-10 (approx. 10% power)

6 sec.

26 sec.

ing to the power level.

P-0 (0% power)

0 sec.

32 sec.

18

P50

OUT

Damper motor relay driving signal.

H : GND

To turn on and off shut-off relay(RY4).

OFF

ON

L

19

P47

OUT

Heating element driving signal.

To turn on and off shut-off relay(RY3). "L" level during

H. GND

convection cooking; "H" level otherwise. During con-

During

OFF

vection cooking, the signal becomes "H" level when

cooking

ON

(Convection)

L

the temperature of the oven cavity exceeds the

predetermined temperature.

20-21

P46-P45

OUT

Terminal not used.

22

P44

OUT

Timing signal output terminal for temperature measurement(OVEN THERMIS-

TOR).

"H" level (GND) : Thermistor OPEN timing.

"L" level (-5V) : Temperature measuring timing.(Convection cooking)

23

P43

OUT

Signal to sound buzzer.

0.1 sec

A: key touch sound.

A

B: Completion sound.

2.0 sec

C: When the temperature of the oven cavity

B

reaches the preset temperature in the

1.0 sec

1.0 sec

H: GND

preheating mode, or when the preheating

C

hold time (30 minutes) is elapsed.

L

24

P42

OUT

Timing signal output terminal for temperature measurement(OVEN).

"H" level (GND) : Ttermistor OPEN timing.

"L" level (-5V) : Temperature measuring timing.(Convection cooking)

25

INT1

IN

Signal to synchronize LSI with commercial power source freqency.

This is the basic timing for all real time

H : GND

processing of LSI.

L (-5V)

16.7 msec.

26

P40

IN

Connected to GND.

27

RST

IN

Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is applied. Temporarily

set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter

set at "H" level.

28/29

XCIN/XCOUT

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

IN

Signal coming from touch key.

When any one of G-1 line keys on key matrix is touched, a corresponding signal from

P17 - P17 will be input into P27. When no key is touched, the signal is held at "L" level.

23