Sharp Carousel R-210D Panduan Servis - Halaman 19

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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 pre-

cautions 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 electric-

ity 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 PW boards con-

taining 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

2SB1238

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 AND 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 trans-

former, 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 insulat-

ing tape. After servicing, be sure to replace the

leads to their original locations.

A. On some models, the power supply cord be-

tween the touch control panel and the oven itself

is so short that the two can't be separated.

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.

SERVICING

approx. 1M ohm

Transistor

DTA123ES

DTA143ES

DTB123ES

DTD143ES

C B

B. On some models, the power supply cord be-

tween the touch control panel and the oven

proper is so 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 the

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 termi-

nal 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 as-

sembly.

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 prevent-

ing 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-210D