Read Sharp R-750AM (serv.man2) Service Manual online
7
750A -
LSI(IZA856DR)
The I/O signal of the LSI(IZA856DR) are detailed in the following table.
The I/O signal of the LSI(IZA856DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
20.0 msec
H : +5V
L : 0V
(Grill or dual)
ON
OFF
During
cooking
L
GND
H.
1-3
SEG21-
OUT
Terminal not used.
SEG23
4
COM1
OUT
Common data signal: COM1.
Connected to LCD (Pin No. 1)
Connected to LCD (Pin No. 1)
5
COM2
OUT
Common data signal: COM2.
Connected to LCD (Pin No. 2)
Connected to LCD (Pin No. 2)
6
COM3
OUT
Common data signal: COM1.
Connected to LCD (Pin No. 3)
Connected to LCD (Pin No. 3)
7
COM4
OUT
Terminal not used.
8
VLC
IN
Signal synchronized with commercial power source frequency.
Signal similar to VSS.
Signal similar to VSS.
9
VSS
IN
Power source voltage: 0V.
VSS voltage of power source circuit input.
VSS voltage of power source circuit input.
10
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.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XOUT terminal.
11
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Output to control oscillation input of XIN.
12-15
K00-K03
IN
Terminal to change functions according to the Model.
DC voltage in accordance with the Model in operation is applied to set up its function.
DC voltage in accordance with the Model in operation is applied to set up its function.
16
TEST
OUT
Connected to VC.
17
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily
set to "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 to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter
set at "H" level.
18
HOLD
IN/OUT
Connected to VDD.
19
INT2
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
20
R81
IN
Terminal not used.
21
INT1
IN
Terminal not used.
22
R83
OUT
Terminal not used.
23
R90
IN
To input signal which communicates the door open/close information to LSI.
Door open "L" level signal (0V). Door close "H" level (+5V)
Door open "L" level signal (0V). Door close "H" level (+5V)
24-25
R91-R92
OUT
Terminal not used.
26
VDD
IN
Connected to GND.
27
R40
OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
28
R41
OUT
Grill heating element driving signsl.
To turn on and off the grill heating element
relay (RY2). "L" level during grill cooking
or dual cooking; "H" level otherwise.
relay (RY2). "L" level during grill cooking
or dual cooking; "H" level otherwise.
A
B
0.1 sec.
2 sec.
H : +5V
L: 0V
H : +5V
L: 0V
TOUCH CONTROL ASSEMBLY/ DESCRIPTION OF LSI
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