3
AV3000 AVC Unit Service Manual
CRN Type Description Remarks
TUN100
UV1316/A
1G-3
313914716781
Asymmetric type tuner
Supply voltage: +5V at pin 7 and +33V at pin 9
Control by I
2
C, SDA at pin 5 and SCL at pin 4.
SAW100 K3953M SAW filter
Picture carrier 33.90MHz, picture to sound carrier
distance 6.5MHz for standard L
SAW101 K9456M SAW filter Sound carrier 40.40MHz for standard L
IC100 TDA9321H
Video Chroma and
Video switch
Supply voltage : +8V at pin 11 and 48 (AS)
Control by I
2
C, SDA at pin 47 and SCL at pin 46
TR100 TPWA01B Nominal centre freq. Fn1=6.0MHz and Fn2=6.5MHz
TR101 TPWA04B Nominal centre freq. Fn1=5.5MHz and Fn2=5.742MHz
X100 Crystal 3.58MHz
X101 Crystal 4.43MHz
4.2.1. IF Demodulator and Video Chroma
Demodulated video signal is output from pin 10 going to sound traps. There are two sound traps,
TR100 for I/L signal and TR101 for BG, outputs from which are switched by SOUND-SWITCH from
IC301 pin 5.
After group delay correction at pin 13, it is connected to pin 14 where TV picture is supplied into video
switch. The TV signal from pin13 is also connected to SCART1 as TV signal output.
Quasi Split Sound converted from SIF input is output at pin 5 to connect with sound decoder IC301.
H and V sync pulses are output at pin 60 and 61 to go to FC/MSC for Synchronisation to convert
progressive scan. H pulse must be inverted by Q126.
When selecting one of video signal in video switch of IC100, CVBS signal is going to COMB filter if the
video is CVBS PAL/NTSC format. Then Y/C separated signal is coming back at pin 28 and 29. The
clock must be provided from pin 30. The video or Y/C signal selected pass through video chroma
section and finally converted to YUV format at pin 49, 50, 51. IC100 is supplied 4.43MHz and 3.58MHz
clock from crystal X100 and X101, which is automatically selected according to the signal received. 2
RGB inputs are also switched at the last stage in IC100. RGB signals are also converted to YUV.
Video Switch.
To Next Page
Loading...
Need help?
General