6
AV3000 AVC Unit Service Manual
4.3.3.
TDA7433
Basic Audio Processor (IC300)
Pin
No.
Description
6 Input Audio sound L input
5 Input Audio sound R input
16 Output Phono sound L output
15 Output Phono sound R output
14 Output Headphone sound L output
13 Output Headphone sound R output
4.3.4. Front AV Video Switch
PL300 is the connector for the front control PCB.
At pin 12 of PL700, CVBS from AV3 is connected.
At pin 11 of PL700, Y from AV3SVHS is connected.
At pin 9 indication of SVHS connector insertion is supplied to micro IC704 pin 38 and then it controls
micro-sw from pin 22 of IC100 in order to select Y from pin 11 of PL700 (micro-sw=H) or to select
CVBS from pin 12 of PL700 (micro-sw=L).
At pin 15 of PL700, C from AV3SVHS is connected to pin 24 of IC100.
4.4.
Interface Board (Schematic Sheet 3)
For Component Input, Progressive Sync Separation and Centre Audio Channel.
Sync separation for progressive YPbPr input (50Hz and 60Hz) are carried out at TA1370. Input video
signal is specifically given from AV4 and connected at pin 26 through clamping circuit constituted by
QC25~QC28. Sync separation for all input signal other than Progressive input are carried out at
TDA9321 (page 1). TA1370 includes switch of sync signal (H and V) between H/V input (pin I and
pin2) from TDA9321 and internal sync separation. TA1370 outputs H at pin16 and V at pin 28, which
are connected to PSF for FC4 board. There are 2 inputs of the connector for each main and sub. H
output at pin 16 on TA1370 is fed to IC10 to shorten H pulse waveform to avoid jittering.
2 inputs, main YUV from IC03 and RGB from micro (TELETXT), are switched and connected to sub-
video input for FC4 (IC107). This is enabled when TV+TEXT is selected (SUB TELETEXT) and when
PC window is selected (SUB VIDEO)
To Next Page
Loading...
Need help?
General