Comb Filter/Svhs Output (Schematic Sheet 6) - Hitachi 32PD3000 Service Manual

SDA5550
4.6.1.
Micro-controller (IC704)
Supply voltage: +3.3VSTB at pin 8, 40, 75 and 92 and +2.5VSTB at pin 6, 22, 56 and 73.
2
Control through I
3 wire bus: 3WB-clock3v3 at pin 41 and 3WB-data3v3 at pin 46:
•
FC-enable at pin 42
•
MSC-enable at pin 43
•
OSD enable at pin 44
Control through/by AVlink: output at pin 16 and input at pin 33.
RS232C (19200bps): TxD3v3 at pin 32 and RxD3v3 at pin 38.
Control by I/R in: at pin 34.
Front Panel Board Connector
4.6.2.
PL702
Pin Pin
No. Name
1 POW LED
2 POWER SAVE
3 STB+5V
4 GND
5 RM-IN
6 A+5V
7 A/D KEY 2
8 A/D KEY 1
9 (BS-LED)
10 (MODEM-LED)

COMB Filter/SVHS Output (Schematic Sheet 6)

4.7.
CVBS from IC100 pin 26 is filtered by C800, C801, L800, and C802 and connected to pin 3.
Y/C separate signals output from IC101 pin 25/23 are also filtered by Q801 base circuit and Q802
base circuit.
•
Y is amplified to adjust the level at Q119/Q120 for return signal to IC100 and SVHS. Y signal
output via buffer Q803.
•
C is amplified to adjust the level at Q121/Q122 for return signal to IC100 and SVHS. C signal
output via buffer Q804.
IC101 requires clock at pin 19 supplied from IC100.
TC9090AF
4.7.1.
COMB filter (IC101)
Supply voltage: +5V at pin 15, 18 and 27.
2
Control by I C: SDA at pin 8 and SCL at pin 9.
AV3000 AVC Unit Service Manual
C: SDA3v3 at pin 52 and SCL3v3 at pin 47.
In/Out Functions
I Power LED
I POWER2
I Stand-by 5V power supply
- GND
O N.C.
I +5V
O Key in 1
O Key in 2
- N.C.
At Front Control
-
N.C.
10