Sharp Carousel R-980E Servis Kılavuzu - Sayfa 27

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1. Precautions for Handling Electronic Components

This unit uses CMOS LSI in the integral part of the

circuits. When handling these parts, the following

precautions should be strictly followed. CMOS LSI

have extremely high impedance at its input and output

terminals. For this reason, it is easily influenced by the

surrounding high voltage power source, static electricity

charge in clothes, etc, and sometimes it is not fully

protected by the built-in protection circuit.

In order to protect CMOS LSI.

1) When storing and transporting, thoroughly wrap them

in aluminium foil. Also wrap all PW boards containing

them in aluminium foil.

2) When soldering, ground the technician as shown in the

figure and use grounded soldering iron and work table.

2. Shapes of Electronic Components

Transistor

2SB910M

3. Servicing of Touch Control Panel

We describe the procedures to permit servicing of the

touch control panel of the microwave oven and the

precautions you must take when doing so. To perform

the servicing, power to the touch control panel is

available either from the power line of the oven itself or

from an external power source.

(1) Servicing the touch control panel with power supply

of the oven:

CAUTION:

THE HIGH VOLTAGE TRANSFORMER OF THE

MICROWAVE OVEN IS STILL LIVE DURING

SERVICING PRESENTS A HAZARD.

Therefore, when checking the performance of the

touch control panel, put the outer cabinet on the oven

to avoid touching the high voltage transformer, or

unplug the primary terminal (connector) of the high

voltage transformer to turn it off; the end of such

connector must be insulated with an insulating tape.

After servicing, be sure to replace the leads to their

original locations.

A. On some models, the power supply cord between the

touch control panel and the oven itself is so short that

the two can't be separated.

SERVICING

approx. 1M ohm

Transistor

DTA123ES

KRA101M

KRA223M

C B

KRC243M

For those models, check and repair all the controls

(sensor-related ones included) of the touch control

panel while keeping it connected to the oven.

B. On some models, the power supply cord between the

touch control panel and the oven proper is long enough

that they may be separated from each other. For those

models, therefore, it is possible to check and repair the

controls of the touch control panel while keeping it

apart from the oven proper; in this case you must short

both ends of the door sensing switch (on PWB) of the

touch control panel with a jumper, which brings about

an operational state that is equivalent to the oven door

being closed. As for the sensor-related controls of the

touch control panel, checking them is possible if dummy

resistor(s) with resistance equal to that of the controls

are used.

(2) Servicing the touch control panel with power supply

from an external power source:

Disconnect the touch control panel completely from the

oven proper,and short both ends of the door sensing

switch (on PWB) of the touch control panel, which

brings about an operational state that is equivalent to

the oven door being closed. Connect an external

power source to the power input terminal of the touch

control panel, then it is possible to check and repair the

controls of the touch control panel it is also possible to

check the sensor-related controls of the touch control

panel by using the dummy resistor(s).

4. Servicing Tools

Tools required to service the touch control panel

assembly.

1) Soldering iron: 30W

(It is recommended to use a soldering iron with a

grounding terminal.)

2) Oscilloscope: Single beam, frequency range: DC -

10MHz type or more advanced model.

3) Others: Hand tools

5. Other Precautions

1) Before turning on the power source of the control unit,

remove the aluminium foil applied for preventing static

electricity.

2) Connect the connector of the key unit to the control unit

being sure that the lead wires are not twisted.

3) After aluminium foil is removed, be careful that abnormal

voltage due to static electricity etc. is not applied to the

input or output terminals.

4) Attach connectors, electrolytic capacitors, etc. to PWB,

making sure that all connections are tight.

5) Be sure to use specified components where high

precision is required.

R-980E