Service manual

15
R-3S68
1 XOUT OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
2 XIN IN Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XIN terminal.
3 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 set. Thereafter set
at “H” level.
4 R70 OUT Segment data signal.
Refer to the touch control panel circuit for the relationship between signals and
indicators. Normally, one pulse is output in every synchronized signal period, and
input to the anode of the light -emitting diode.
5 PULSE OUT Signal to sound buzzer.
A: key touch sound(0.12 sec.).
B: Completion sound(2.4 sec.).
6 R72 OUT Digit selection signal.
Refer to the touch control panel circuit about the relation between signals and digits.
Normally, one pulse is output in every synchronized signal period, and input to the light
-emitting diode.
7-9 R40-R42 OUT Digit selection signal.
Refer to the touch control panel circuit about the relation between signals and digits.
Normally, one pulse is output in every synchronized signal period, and input to the light
-emitting diode.
10 AIN3 IN Terminal to change cooking constant.
11 R50 OUT Segment data signal.
Signal similar to R70.
12-13 R51-R52 OUT Segment data signal.
Refer to the touch control panel circuit for the relationship between signals and
indicators. Normally, one pulse is output in every synchronized signal period, and
input to the anode of the light -emitting diode.
14 VSS IN Connected to VC.
15 R53 OUT Segment data signal.
Signal similar to R70.
16 R60 OUT Segment data signal.
Signal similar to R70.
17 R61 OUT Segment data signal.
Signal similar to R70.
Switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R81, R82 and R83
terminal while one of diode D56 line switches on switch matrix is touched.
18 R62 OUT Segment data signal.
Signal similar to R70.
Switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R81, R82 and R83
terminal while one of diode D57 line switches on switch matrix is touched.
DESCRIPTION OF LSI
LSI(IZA677DR)
The I/O signal of the LSI(IZA677DR) is detailed in the following table.
Pin No. Signal I/O Description