Toshiba 27A51 27" TV

FILE NO. 050-200113

SERVICE MANUAL

COLOR TELEVISION

27A51

SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES

6. AVOID AN X-RAY

As for the places which need special attentions, they are indicated with the labels or seals on the cabinet, chassis and parts. Make sure to keep the indications and notices in the operation manual.

2. AVOID AN ELECTRIC SHOCK There is a high voltage part inside. Avoid an electric shock while the electric current is flowing.

3. USE THE DESIGNATED PARTS The parts in this equipment have the specific characters of incombustibility and withstand voltage for safety. Therefore, the part which is replaced should be used the part which has the same character. Especially as to the important parts for safety which is indicated in the circuit diagram or the table of parts as a mark, the designated parts must be used.

4. PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER ASSEMBLING OR WIRING

Safety is secured against an X-ray by considering about the cathode-ray tube and the high voltage peripheral circuit, etc. Therefore, when repairing the high voltage peripheral circuit, use the designated parts and make sure not modify the circuit. Repairing except indicates causes rising of high voltage, and it emits an X-ray from the cathoderay tube.

7. PERFORM A SAFETY CHECK AFTER SERVICING Confirm that the screws, parts and wiring which were removed in order to service are put in the original positions, or whether there are the portions which are deteriorated around the serviced places serviced or not. Check the insulation between the antenna terminal or external metal and the AC cord plug blades. And be sure the safety of that. (INSULATION CHECK PROCEDURE)

There are parts which use the insulation material such as a tube or tape for safety, or which are assembled in the condition that these do not contact with the printed board. The inside wiring is designed not to get closer to the pyrogenic parts and high voltage parts. Therefore, put these parts in the original positions.

5. TAKE CARE TO DEAL WITH THE CATHODE-RAY TUBE

1. Unplug the plug from the AC outlet. 2. Remove the antenna terminal on TV and turn on the TV. 3. Insulation resistance between the cord plug terminals and the eternal exposure metal [Note 2] should be more than 1M ohm by using the 500V insulation resistance meter [Note 1]. 4. If the insulation resistance is less than 1M ohm, the inspection repair should be required. [Note 1]

In the condition that an explosion-proof cathoderay tube is set in this equipment, safety is secured against implosion. However, when removing it or serving from backward, it is dangerous to give a shock. Take enough care to deal with it.

If you have not the 500V insulation resistance meter, use a Tester. [Note 2]

External exposure metal: Antenna terminal Earphone jack

HOW TO ORDER PARTS Please include the following informations when you order parts. (Particularly the VERSION LETTER.) 1. MODEL NUMBER and VERSION LETTER The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be found at the end of the SERIAL NUMBER. 2. PART NO. and DESCRIPTION You can find it in your SERVICE MANUAL.

IMPORTANT Inferior silicon grease can damage IC's and transistors. When replacing an IC's or transistors, use only specified silicon grease (YG6260M). Remove all old silicon before applying new silicon.

GENERAL SPECIFICATIONS G-1

TV System

CRT

CRT Size / Visual Size CRT Type Deflection Magnetic Field BV/BH

27 inch / 676mmV Normal 102 degree +0.45G/0.18G NTSC 2Speaker Front 2.0 x 3.5 Inch 8 ohm 2.5 + 2.5 W 2.0 + 2.0 W No US System M 1Tuner Ohers F-Synth VHF/UHF 75 ohm 2 - 69, 4A, A-5 - A-1, A - I, J - W, W+1 - W+84 45.75MHz 41.25MHz 4.50MHz No Yes Yes 120V AC 60Hz -

Color System Speaker

Sound Output

G-2

Tuning System

NTSC3.58+4.43 /PAL60Hz Broadcasting System Tuner and Receive CH

Intermediate Frequency

G-3

Power

Preset CH Stereo/Dual TV Sound Tuner Sound Muting Power Source

Position Size Impedance MAX 10%(Typical)

System Destination Tuning System Input Impedance CH Coverage Picture(FP) So