Hitachi 32PD3000E, Service Manual

Page: 26 / 93

32PD3000 / 42PD3000
25
Schematic Page 3 ; Interface Board (component input, progressive sync
separation, centre audio channel
)
IC08 Sync separation for Component (progressive) input ; TA1370
supply voltage ; +9V at pin 11
control by ; I2C, SDA at pin 21 and SCL at pin 22
XC01 50KHz
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 with QC25~QC28
Sync separation for all input signal other than Progressive input are carried out at
TDA9321 (page1)
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.
IC02/IC03 YUV/RGB switch ; TA1287
supply voltage ; +9V at pin 16
control by ; DC voltage at pin 9/10/11 and matrix at pin 16
input IC02 YUV; Main signal
IC03 YUV; from IC02
YUV ; at pin 1/2/3, Y:1Vpp (incl.sync), UV:0.3Vpp
RGB ; at pin 6/7/8, 0.7Vpp
output IC02 connect to IC03
IC03 connect to FC4 through buffers
YUV ; at pin13/14/15, Y:1Vpp (incl.sync), UV:0.3Vpp
matrix control of RGB input (YUV can also input. In this case, matrix control
should be through)
IC02 0V; through
IC03 always 1.6V:RGB --> YUV
control IC02 0V; external (Components input)
IC03 0V; Video
IC04/IC05/IC06 Analogue switch ; BU4066
supply v9V at pin 14