Acer R-1200 Wartungshandbuch PDF herunterladen (Seite 20)

R-1200

R-1201

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

8) Disconnect the power supply cord.

9) Open the door and block it open.

10) To discharge high voltage capacitor, wait for 60 seconds.

11) Reconnect all leads removed from components during testing.

12) Re-install the outer case (cabinet).

13) Reconnect the power supply cord after the outer case is installed.

14) Run the oven and check all functions.

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

Symbol Voltage Application

VC -5.3V LSI(IC1)

3) Synchronizing Signal Circuit

The power source synchronizing signal is available in

order to compose a basic standard time in the clock

circuit. It incorporates a very small error because it works

on commercial frequency.

4) Reset Circuit

A circuit to generate a signals which resetting the LSI to

the initial state when power is applied.

5) Buzzer Circuit

The buzzer is responds to signals from the LSI to emit

audible sounds (key touch sound and completion sound).

6) Door Sensing Switch

A switch to inform the LSI if the door is open or closed.

7) Relay Circuit

To drive the magnetron, fan motor, turntable motor and

light the oven lamp and hood lamp.

8) Indicator Circuit

This circuit consists of 22 segments and 3 common

electrodes using a Light Crystal Display.

9) Back Light Circuit

A circuit to drive the back light (Light emitting diodes LD1-

LD4).

The touch control section consists of the following units

as shown in the touch control panel circuit.

(1) Key Unit

(2) Control Unit (The Control unit consists of LSI Unit and

Power Unit)

The principal functions of these units and the signals com-

municated among them are explained below.

Key Unit

The key unit is composed of a matrix, signals generated in

the LSI are sent to the key unit through P20, P21, P22, P23,

P24, P25, P26 and P27.

When a key pad is touched, a signal is completed through

the key unit and passed back to the LSI through P43, P44,

P45 and P46 to perform the function that was requested.

Control Unit

Control unit consists of LSI, power source circuit, synchro-

nizing signal circuit, reset circuit, buzzer circuit, relay circuit

indicator circuit and back light circuit.

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 voltages necessary for the control

unit from the AC line voltage.

In addition, the synchronizing signal is available in order

to compose a basic standard time in the clock circuit.

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