Table of Contents
Advertisement
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
primary coil resistance).
if any abnormal condition is detected, re-
place the defective parts.
CARRY OUT 4R CHECKS.
COMPONENT TEST
OUTLINE OF TOUCH CONTROL PANEL
(1) Key Unit
(2) Control Unit
Key Unit
Control Unit
1) LSI
This LSI controls the key strobe signal, relay driving
signal for oven function and indicator signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control
unit.
Symbol
Voltage
VC
-5.2V
Application
LSKIC1)
18
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit. It accompanies a very small error because it
works on commercial frequency.
4) ACL
A circuit to generate a signals which resets the LSI to
the initial state when power is supplied.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion
sound).
eel
6
eet
Door Sensing Switch (Stop Switch)
A switch to "tell" the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, heating element, fan motor,
turntable motor and light the oven lamp.
8) Encoder
The encoder converts the signal generated by LS! into
AL
fo
tap
ew
9) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD1 - LDS).
10) indicator Circuit
This circuit consists of 4-digits, 30-segments and 3-
common electrodes using a Liquid Crystal Display.
Advertisement
Table of Contents
