Service manual

19
KB-3401LS
KB-3401LK
KB-3401LW
1 AN5 IN Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
2 AN4 IN Turminal not used.
3 AN3 OUT
Door lock motor driving signal.
To turn on and off shut-off relay(RY8).
“H”level during door lock motor driving
“L” level otherwise
4 AN2 IN Input signal which communicates the oven door locked information to LSI.
Door unlocked; “H” level signal(+5V).
Door locked; “L” level signal(0V).
5 AN1 IN
Input signal which communicates the oven door unlocked information to LSI.
Door locked; “H” level signal(+5V).
Door unlocked; “L” level signal(0V).
6 AN0 IN Turminal not used.
7 CNVSS IN Power source voltage: 0V (GND).
VC voltage of power source circuit input. Connected GND.
8 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.
9 P62 OUT Memory (EEPROM) clock out.
10 P61 IN/OUT Memory (EEPROM) data input/output.
11 VSS IN Power source voltage: 0V (GND).
VS voltage of power source circuit input. Connected GND.
12 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.
13 XOUT OUT Internal clock oscillation frequency control output.
Output to control oscillation input of Xin.
14 VCC IN Power source voltage: +5V.
VC voltage of power source circuit input.
15 P60 IN Plus signal coming from the Microwave drawer door open-close motor is input into P60
as revolution number.
16 P37 OUT Terminal not used.
17 P36 OUT Terminal not used.
18 P35 OUT Terminal not used.
19 P34 OUT Terminal not used.
20 RXD2 IN Input terminal to check the data of display.
Data signal from IC-3 is input to RXD2 to check the flow of the data.
21 TXD2 IN Output terminal to send IC-2 the data.
The data of display is output to IC-2.
22 SCLK2 OUT Clock timing signaI output terminal.
Clock timing signal is sent to IC-2 and IC-3.
DESCRIPTION OF LSI (IC-1)
The I/O signal of the LSIis detailed in the following table.
Pin No. Signal I/O Description
ON
OFF
During
door lock
motor driving
L: GND
H: +5V