Service manual

17
KB-3411JS
KB-3411JK
KB-3411JW
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 IN Input signal which communicates the drawer door open information to LSI from
the door position switch front.
Door opened; “L” level signal(0V).
Door closed; “H” level signal(+5V).
17 P36 OUT Signal to change the rotational direction is output to the Microwave drawer door
open-close motor.
18 P35 OUT Signal to change the rotational speed is output to the Microwave drawer door open-close
motor.
19 P34 OUT Power source to drive the Microwave drawer door open-close motor is output.
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