Outline Of System - Toshiba 1997 G Series Troubleshooting Manual

1. Outline of system

The block diagram of the power supply is shown in Fig.
1. The N7 chassis consists of the standby power supply
which supplies power to the microcomputer, and the
main power supply which supplies power to the hori-
zontal output and audio output. This chassis also has a
scan driven supply from the flyback which supplies
power to the vertical output, video output, and signal
processing circuts.
The main supply is a current resonating type supply. It
is small in size, highly efficient and reliable.
T840
F801 T801 T802
POWER
TRANS.
TPW
1549AZ
SR81
D801
Q801
VOLTAGE CONTROL
STR-Z3201
Q843
SW
Q862
PHOTO COUPLER
Q830
SW
D802~D805
Q802
VOLTAGE CONTROL
STR57041
Q840
+12V
REG. +5V-1 (MICROCOMPUTER)
D840
+12V
T862
F860
+38V
R861
Q430
TPW
3332AS
R883
F850 +26.5V
T888
F851
+15V
Fig. 1 Power supply block diagram.
LOW VOLTAGE PROTECTOR
-15V
TPW
3330AM
Q840
REG. 5V-2 (TUNER, COMB, V/C/D etc.)
Q840
5V-3 (PIP, ESD/C.C/RGB. SW)
REG.
Q840
9V-2 (COMB, DSP, CRT-D etc.)
REG.
AUDIO OUT
+9V
H.Vcc (V/C/D)
F470
R470
R479 R471
1 2
X-RAY
Z801 13
PROTECTOR C471
H1C1019
14
16
3
Q853 Q854
2
+13(+125V)
F.B.T. V.M
+32V (TUNER)
R101
F.B.T.(HEATER)
+
D471 R472
200V L.V.P. 35V O.C.P
R7782
O.C.P
Q768
R7750
CONVERGENCE
CIRCUIT
O.C.P
Q759
R7765
O.C.P
Q762