24232103 datasheet(16/50 Pages) TOSHIBA

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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 CON-

TRAST 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 17)

4. Vary the BRIGHTNESS to both extremes to be sure the

high voltage does not exceed the limit under any condi-

tions.

CAUTION:

When the following parts fail, check the High Voltage after

replacing.

FS CIRCUIT CHECK

The Fail Safe (FS) circuit check is indispensable for the final

check in servicing. Checking should be done following the

steps below.

1. Turn the receiver on.

2. Temporarily short TP- (R) and TP- (X) on the DEF/POWER

Board with a jumper wire.

Raster and sound will disappear.

3. The receiver must remain in this state even after removing

the jumper wire. This is the evidence that the FS circuit is

functioning properly.

4. To obtain a picture again, temporarily turn the receiver off

and allow the FS circuit more than 5 seconds to reset. Then

turn the receiver on to produce a normal picture.

Location

No.

Name

T461

C447

C406

C407

Flyback Trans.

Capacitor

TFB3078ZD

3900pF,

±3%

1500pF,

±3%

4700pF,

±3%

ANODE VOLTAGE MEASURING METHOD

CAUTION: Take extra precaution when measuring this high

voltage. High voltages are also present in

surrounding circuit boards (CRT DRIVE assem-

bly, DEFLECTION assembly, and POWER

SUPPLY assembly).

1. Disconnect the FBT anode cable as outlined below. Meas-

ure 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 discon-

necting 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.

Troubleshooting Guide for Fail Safe Circuit

Check that the set returns to normal operation when

pin 12 of Z801 is grounded with jumper wire.

Check the voltage across

Capacitor C471 is

approximately (C) volts.

Refer to table –4 for

fall safe voltage (C) .

Faulty power

circuit or hori-

zontal circuit.

Defective Fail Safe Circuit

(See SETTING & ADJUSTING

DATA on page17)

YES

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