Service manual

9
R-21JCA
Pin No. Signal I/O Description
9
RESET
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.
10 CNVSS IN
Power source voltage.
The power source voltage to drive the LSI is input to CNVSS terminal.
11 XOUT OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
12 XIN IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
13 VSS IN
Power source voltage: 0V.
The power source voltage to drive the LSI is input to VSS terminal. Connected to VC.
14 VDD IN
Power source voltage: +5V.
The power source voltage to drive the LSI is input to VDD terminal.
15 N.F IN Connected to VSS terminal.
16 INT0 IN
Signal coming from encoder.
Signal similar to P22. Pulse signals are input into INT0.
17 INT1 IN
Signal to synchronize LSI with commercial power source frequency.
This is basic timing for all real time
processing of LSI.
18 AIN0 IN Input signal which communicates the door open/close information to LSI.
Door closed; "L" level signal.
Door opened; "H" level signal.
19-21
AIN1-AIN3 IN Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
22 P00 OUT Terminal not used.
23 P01 OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). In 100% power operation, the signals hold "H"
level during microwave cooking and "L" level while not cooking.
24 P02 OUT
Oven lamp, turntable motor and fan motor driving signal(Square Waveform :
60Hz).
To turn on and off shut-off relay (RY1). The square
waveform voltage is delivered to the relay (RY1)
driving circuit and relay(RY2) control circuit.
25 P03 OUT
Signal to sound buzzer.
Completion sound.
26 P10 OUT Terminal not used.
27-29 P11-P13 OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD5, LD10, LD15 and LD20).
30 D0 OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD4, LD9, LD14 and LD19).
31 D1 OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD3, LD8, LD13 and LD18).
32 D2 OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD2, LD7, LD12 and LD17).
16.7 msec
H : +5V
L: 0V
16.7 msec
During cooking
H
L
H: +5V
L: 0V
2.0 sec