2SC752 datasheet(33/126 Pages) TOSHIBA

33 / 126 page

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CIRCUIT CHECKS

HIGH VOLTAGE CHECK

CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on this chassis. Checking should be done following the steps below.

1. Connect an accurate high voltage meter to the anode of the picture tube.

2. Turn on the receiver. Set the BRIGHTNESS and CONTRAST to minimum (zero beam current).

3. High voltage must be measured below (B) kV.

Refer to table-1 for high voltage (B).

(See SETTING & ADJUSTING DATA on page 34)

4. Vary the BRIGHTNESS to both extremes to be sure the high voltage does not exceed the limit under any conditions.

CAUTION:

When the following parts fail, check the High Voltage after replacing.

ANODE VOLTAGE MEASURING METHOD

CAUTION: Take extra precaution when measuring this high voltage. High voltages are also present in surrounding circuit

boards (CRT DRIVE assembly, DEFLECTION assembly, and POWER SUPPLY assembly).

1. Disconnect the FBT anode cable as outlined below. Measure high voltage at the point where the cable enters the FBT.

2. Holding the rubber cover firmly, turn it counterclockwise and check that the lock has been disengaged. (See Fig. b on page

8.)

3. Determine the extent of the rubber cover before disconnecting the cable.

4. Pull straight up the anode cable to disconnect.

5. When reconnecting the cable, proceed in the reverse order.

After reconnecting, tug on the cable to check that it is secure.

Location

No.

Name

T461

D489

Q480

Q483

R435

R489

R490

R450

C440

C443

C444

Flyback Trans.

Zener Diode

Transistor

Resistor

Capacitor

TFB3078BD

MTZJ3.6B

2SC2023

TA7508P(J)

33k ohm,

±5%

3.3k ohm,

±5%

3.3k ohm,

±5%

1k ohm

1000pF,

±3%

6800pF,

±3%

5100pF,

±3%

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