Frigidaire FMV157GS Service Manual page 27

https://appliancetechmanuals.com
FMV157GC
Pin No. Signal
7 AN3
8 AN2
9-10 AN1-AN0
11-13 P57-P55
14 CNTR0
15 P53
16 P52
17-18 P51-P50
19 P47
20 P46
21 P45
22 P44
23 P43
24 INT0
25 P41
26 P40
27 RESET
28-29 P71-P70
30 XIN
31 XOUT
32 VSS
I/O
OUT Back light circuit (Light emitting diodes) driving signal.
IN To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
OUT Terminal not used.
OUT Terminal not used.
OUT Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
OUT Terminal not used.
OUT Oven lamp, fan motor and turntable motor driving signal
To turn on and off shut off relay (RY1). The square
waveform voltage is delivered to the RY1 driving
circuit and RY2 control circuit.
OUT Terminal not used.
OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave cooking
and "H" level while not cooking. In other cooking
modes (variable cooking) the signal turns to "H"
level and "L" level in repetition according to the
power level.
IN Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P20, P21,
P22, P25 and P26 will be input into P46. When no key is touched, the signal is held at "H"
level.
IN Signal similar to P46.
When either G11 line on key matrix is touched, a corresponding signal will be input into
P45.
IN Signal similar to P46.
When either G10 line on key matrix is touched, a corresponding signal will be input into
P44.
IN Signal similar to P46.
When either G9 line on key matrix is touched, a corresponding signal will be input into
P43.
IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
OUT Terminal not used.
IN Connected to GND through the pull-down resistor R100.
IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
OUT Terminal not used.
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.
OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
IN Power source voltage: -5.0V.
VC voltage of power source circuit input.
Page 27
Description
0.1 sec.
A
2.0 sec.
B
Maximum
output
70% of
maximum
output
(ON and OFF times for other power level.)
26
H : GND
L : -5V
H : GND
L : -5V
16.7 msec.
H : GND
L : -5V
During cooking
OFF
H : GND
ON
L : -5V
OFF OFF
H : GND
24 sec.
8 sec.
ON
L : -5V
16.7 msec.
H : GND
L : -5V