Frigidaire CFMV152KW, Servicing Manual

Page: 33 / 52

Section 3 Troubleshooting and Testing
3-15
1-2
3-6
7
8
9-10
11-13
14
15
16
17-18
19
20
21
22
23
24
25
26
27
28-29
30
31
32
VL2-VL1
AN7-AN4
AN3
AN2
AN1-AN0
P57-P55
CNTR0
P53
P52
P51-P50
P47
P46
P45
P44
P43
INT0
P41
P40
RESET
P71-P70
XIN
XOUT
VSS
IN
IN
OUT
IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
OUT
IN
IN
OUT
IN
OUT
IN
Power source voltage input terminal.
Standard voltage for LCD.
Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
Back light circuit (Light emitting diodes) driving signal.
To input signal which communicates the door open/close information to LSI.
Door close “H” level signal (0V). Door open “L” level signal (-5V).
Terminal not used.
Terminal not used.
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
Terminal not used.
Oven lamp, fan motor and turntable motor driving
signal.
To turn on and off shut off relay. The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
Terminal not used.
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.
Signal coming from touch key.
When either G 2 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.
Signal similar to P46.
When either G11 line on key matrix is touched, a corresponding signal will be input into P45.
Signal similar to P46.
When either G10 line on key matrix is touched, a corresponding signal will be input into P44.
Signal similar to P46.
When either G9 line on key matrix is touched, a corresponding signal will be input into P43.
Signal synchronized with commercial
power source frequency.
This is the basic timing for time processing of LSI.
Terminal not used.
Connected to GND through the pull-down resistor R100.
Auto clear terminal. Signal is input to reset LSI to the initial state when power is applied.
Terminal not used.
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Power source voltage: -5.0V.
VC voltage of power source circuit input.
H: GND
H: GND
L: -5V
L: -5V
OFF
OFF OFF
ON
ON
24 sec.
8 sec
Maximun
Output
70% Output
H: GND
L: -5V
16.7 msec
Pin# Signal I/O Description
A
B
0.1 sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V
16.7 msec.
H: GND
L: -5V
During Cooking