– 12 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
CIRCUIT CHECKS
Troubleshooting Guide for Fail Safe Circuit
Check that the set returns to normal operation when pin 12
of Z801(or emitter of Q472) is grounded with jumper wire.
Check the voltage across
Capacitor C471 is
approximately (C) volts.
Refer to table –4 for
fail safe voltage (C) .
Faulty power
circuit or hori-
zontal circuit.
Defective Fail Safe Circuit
(See SETTING & ADJUSTING
DATA on page13)
YES
NO
NO
YES
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 second an-
ode of the picture tube.
2. Turn on the receiver. Set the BRIGHTNESS and CON-
TRAST controls 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 13)
4. Vary the BRIGHTNESS control to both extremes to be sure
the high voltage does not exceed the limit under any con-
ditions.
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 and press the RESET button.
2. Temporarily short TP-(R) and TP-(X) 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 power switch on to produce a normal picture.
Summary of Contents for 32AF53
Page 29: ... 29 39 SIGNAL BOARD PD1208 BOTTOM FOIL SIDE ...
Page 30: ... 31 32 POWER DEF BOARD PD1019 BOTTOM FOIL SIDE ...
Page 31: ... 33 CRT DRIVE BOARD PB9973M BOTTOM FOIL SIDE ...
Page 32: ... 34 CONTROL 1 BOARD PD0658B BOTTOM FOIL SIDE ...
Page 33: ... 35 CONTROL 2 BOARD PD1024A BOTTOM FOIL SIDE ...
Page 34: ... 36 IF BOARD PD1022A BOTTOM FOIL SIDE ...
Page 38: ... 40 SPECIFIC INFORMATIONS QG01 DIG Comb ZY01 PIP Module CIRCUIT BLOCK DIAGRAM ...
Page 40: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN ...