– 13 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
CIRCUIT CHECKS
Troubleshooting Guide for Fail Safe Circuit
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 14)
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 pic-
ture.
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
FBT detection voltage
(C)
.
Faulty power
circuit or hori-
zontal circuit.
Defective Fail Safe Circuit
(See SETTING & ADJUSTING
DATA on page14)
YES
NO
NO
YES
Summary of Contents for 32HFX71
Page 43: ... 43 44 SIGNAL BOARD PD0162 BOTTOM FOIL SIDE ...
Page 44: ... 45 46 POWER DEF BOARD PD0159 BOTTOM FOIL SIDE ...
Page 45: ... 47 CRT D VM BOARD PD0164 BOTTOM FOIL SIDE ...
Page 46: ... 48 LOW B BOARD PB9567 BOTTOM FOIL SIDE AC IN BOARD PD0161 BOTTOM FOIL SIDE ...
Page 47: ... 49 CONTROL 1 BOARD PB9570 BOTTOM FOIL SIDE ...
Page 48: ... 50 CONTROL 2 BOARD PB9571 BOTTOM FOIL SIDE ...
Page 49: ... 51 WOW BOARD PD0220 BOTTOM FOIL SIDE ...
Page 50: ... 52 NEXT HYPER BOARD PD0264 BOTTOM FOIL SIDE ...
Page 52: ... 54 SPECIFIC INFORMATIONS MEMO ...
Page 54: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN ...
