Read Sharp R-642M Service Manual online
9
R-642M -
17
XRESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied.
Temporarily set "L" level the moment power is supplied, at this time the LSI
is reset. Thereafter set at "H" level.
Signal is input to reset the LSI to the initial state when power is supplied.
Temporarily set "L" level the moment power is supplied, at this time the LSI
is reset. Thereafter set at "H" level.
18
XTEST
IN
Connected to GND.
19
VSS
IN
Power source voltage: -5V.
Power source voltage is applied to drive the LSI.
Power source voltage is applied to drive the LSI.
20
OSC1
IN
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation
circuit with respect to OSC2 terminal.
The internal clock frequency is set by inserting the ceramic filter oscillation
circuit with respect to OSC2 terminal.
21
OSC2
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of OSC1.
Output to control oscillation input of OSC1.
22
VD1
IN
Power source voltage input terminal.
Power source voltage is applied to drive the oscillation circuit which makes
the clock signal in the LSI.
Power source voltage is applied to drive the oscillation circuit which makes
the clock signal in the LSI.
23
VDD
IN
Power source voltage: 0V.
Power source voltage is applied to drive the LSI.
Power source voltage is applied to drive the LSI.
24
AVDD
IN
Power source voltage input terminal.
Power source voltage is applied to drive the A/D converter in the LSI.
Connected to GND.
Power source voltage is applied to drive the A/D converter in the LSI.
Connected to GND.
25
AVREF
IN
Reference voltage input terminal.
A reference voltage is applied to drive the A/D converter in the LSI.
Connected to GND.
A reference voltage is applied to drive the A/D converter in the LSI.
Connected to GND.
26
AVSS
IN
Power source voltage input terminal.
Power source voltage is applied to drive the A/D converter in the LSI.
Connected to VC. (-5V)
Power source voltage is applied to drive the A/D converter in the LSI.
Connected to VC. (-5V)
27-28
NC
No connection terminal.
29-32
R40-R43
IN
Terminal to change functions according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance
with the Model in operation is applied to set up its function.
By using the A/D converter contained in the LSI, DC voltage in accordance
with the Model in operation is applied to set up its function.
33
NC
No connection terminal.
Pin No.
Signal
I/O
Description
34
BZ
OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
35
R00
OUT
Terminal not used.
36
R01
OUT
Grill heating element driving signal.
To turn on and off the grill heating
element relay (RY2). "L" level during
grill cooking or dual cooking; "H" level
otherwise.
To turn on and off the grill heating
element relay (RY2). "L" level during
grill cooking or dual cooking; "H" level
otherwise.
37
R02
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook
relay (RY3). In 100% POWER
operation, the signals hold
"L" level during microwave
cooking and "H" level while
not cooking. In other cooking
modes (70%, 50%, 30%, 10%)
the signal turns to "H" level
and "L" level in repetition
according to the power level.
relay (RY3). In 100% POWER
operation, the signals hold
"L" level during microwave
cooking and "H" level while
not cooking. In other cooking
modes (70%, 50%, 30%, 10%)
the signal turns to "H" level
and "L" level in repetition
according to the power level.
ON/OFF time ratio in Mi-
cro cooking
(a. 32second time base)
cro cooking
(a. 32second time base)
ON/OFF time ratio in Mi-
cro cooking
(a. 48second time base)
cro cooking
(a. 48second time base)
MICRO
ON
OFF
COOK
100%
100%
32sec.
0sec.
70%
24sec.
8sec.
50%
18sec.
14sec.
30%
12sec.
20sec.
10%
6sec.
26sec.
MICRO
ON
OFF
COOK
100%
48sec.
0sec.
70%
36sec.
12sec.
50%
26sec.
22sec.
30%
16sec.
32sec.
10%
8sec.
40sec.
A
B
0.1 sec.
2 sec.
H : 0V
L: -5V
H : 0V
L: -5V
(Grill or dual)
ON
OFF
During
cooking
L : -5V
0V
H :
DESCRIPTION OF LSI
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