Sharp R-9H56, Service Manual

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R-9H56
23
The square waveform voltage is delivered
to the relay(RY1) driving circuit and
relays(RY2,RY3,RY5) control circuit.
20-21 P46-P45 OUT Terminal not used.
22 P44 OUT Timing signal output terminal for temperature measurement(OVEN).
"H" level (GND) : Ttermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing.(Convection cooking)
23 P43 OUT Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
C: When the temperature of the oven cav-
ity reaches the preset temperature in
the preheating mode, or when the
preheating hold time (30 minutes) is
elapsed.
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 P41 IN Signal to synchronize LSI with commercial power source freqency.
This is the basic timing for all real time
processing of LSI.
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
P03,P05,P11,P12,P15,P16,P20 and P23 will be input into P27. When no key is
touched, the signal is held at "L" level.
34 P26 IN Signal similar to P27.
When any one of G-2 line key on key matrix is touched, a corresponding signal will be
input into P26.
35 P25 IN Signal similar to P27.
When any one of G-3 line key on key matrix is touched, a corresponding signal will be
input into P25.
36 P24 IN Signal similar to P27.
When any one of G-4 line key on key matrix is touched, a corresponding signal will be
input into P24.
37 P23 OUT Segment data signals.
The relation between signals and indicators are as follows:
Signal Segment Signal Segment Signal Segment Signal Segment
P35 .................. P1 P03 ................... P5 P12 ................... P8 P20 ................. P13
P36 .................. P2 P04 ................... P6 P13 ................... P9 P21 ................. P14
P00 .................. P3 P05 ................... P7 P15 ................. P10 P23 ................. P15
P01 .................. P4 P11 ................. P12 P16 ................. P11
Pin No. Signal I/O Description
During cooking
L
H
20 msec.
A
B
C
H: GND
L
0.1 sec
2 sec
1 sec
1 sec
H : GND
L (-5V)
20 msec