Sharp Carousel R-930CS Руководство по эксплуатации - Страница 32

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R-930CS

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 imped-

ance 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 some-

times 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 MI-

CROWAVE OVEN IS STILL LIVE DURING SERVICING

AND PRESENTS A HAZARD.

Therefore, before checking the performance of the touch

control panel,

1) Disconnect the power supply cord, and then remove outer

case.

2) Open the door and block it open.

3) Discharge high voltage capacitor.

4) Disconnect the leads to the primary of the power trans-

former.

5) Ensure that these leads remain isolated from other

components and oven chassis by using insulation tape.

6) After that procedure, re-connect the power supply cord.

After checking the performance of the touch control panel,

1) Disconnect the power supply cord.

2) Open the door and block it open.

3) Re-connect the leads to the primary of the power trans-

former.

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

TOUCH CONTROL PANEL SERVICING

approx. 1M ohm

Transistor

DTA123ES

KRA101M

KRA223M

KRC243M

C B

5) Re-connect the power supply cord after the outer case is

installed.

6) Run the oven and check all functions.

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. 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, 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

activates 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 activates 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 connectors 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.