Avc Power Board Description; Avc Power Board Block Diagram; Switching Regulator, Controller And Power Mos Fet - Hitachi 32PD3000 Service Manual

26-way Connector
4.8.2.
Connection with FC/MSC Board (PL700).
Assuming that 1 V
•
UV are inverted by Q609, Q612, Q610 & Q613 to CbCr (U'V') at pin 25/24 and those are
adjusted to the level at 1.4Vp-p
•
Y is amplified by Q608/Q611 to adjust the level at 1.4V for signal and 0.6V for sync (2V
total) at pin 26
Sound level L and R at pins 6/4 should be 500mVrms on the condition that:
•
500mVrms audio is input through SCT100-BOTTOM (AV3)
•
BG FM sound with 54% modulation is received
Connection with FC/MSC Board (PL701).

5. AVC POWER BOARD DESCRIPTION

VT

AVC Power Board Block Diagram

5.1.
R914, Q902~4
Fuse F901
AC INLET
4A/250V
AC in
100~240V
To Frame
GND

Switching Regulator, Controller and Power MOS FET

5.2.
STR-F6668B (I901).
Supply voltage at pin 4:
•
Over +16V (start operating),
•
over +10V (keep operating).
AV3000 AVC Unit Service Manual
video signal with 75 ohm terminated is input through SCT100-BOTTOM (AV3):
p-p
Primary
Over-voltage
Protection
Circuit
Standby
Standby
DC/DC
Rectifier
Converter
D902
Relay
Fuse F902
2A/250V
Main
Rectifier
Switching
D901
Transformer
Photo-
Switching
coupler
Regulator
I902
I901
Secondary
H901
Relay
Driver
S901
Q930
SW
(Detect
Q932
Voltage-down)
16V
T901
Error
Amp
Q934,
D938
12
Protection
Circuit
(Detect
Q931, Q933
Voltage-over)
DC/DC Converter
I931, D950, L931
DC/DC Converter
I933, D949, L932
DC/DC Converter
I930, D959, L933
DC/DC Converter
I932
in
p-p
STBY +5V
to AV Board
POWER on/off
from AV Board
30V
to AV Board
9.5V
to AV Board
1.8V
to FC Unit
3.3V
to AV Board/FC Unit
5.5V
to AV Board/FC Unit
5V
to FC Unit