3DQDVRQLF
39
Chapter
3
EURO 4H Supplement
4.
AV2 Video Out Switching
AV2 video out switching on EURO 4 is performed on
the H-Board by IC3401. However with the introduction
of the F-Board, used on 100Hz EURO 4 models, AV2
video switching is now performed by switching IC
IC601 located on the E-Board, but which performs the
same operation as IC3401 on the H-Board. This
switching being used to feed video out to the AV2 scart
socket. The signals fed to the switching IC IC601 are:
:
RF Video
This signal is the video fed from the tuner to the AV
video switching IC, IC601 pin 3. The RF video signal
is then output via pin 6 of IC601 where the signal is
then fed directly to the AV2 scart socket.
:
AV2 V-Out
The signal selected for AV2 video out (V-Out) is input
via pin 8 of IC601. Here the video signal is switched
and output via pin 6 of IC601 and fed to AV2 video out
of the 21 pin scart socket.
Those models however which have an additional
S-VHS input is fed via AV3 located on the M-Board.
Also performed on the M-Board is the combining of
the luminance and chrominance signals to produce a
video signal (which is described in the EURO 4
Technical Guide section 18 of the M-Processing
Stage).
This newly combined video signal is then fed to the
E-Board via connector E15 and is fed to pin 8 of
IC601. The video signal is then output from pin 6 and
fed to the video output, pin 19 of AV2.
Likewise video out fed from the VPC pin 64 to the
E-Board via connector E70 pin 25 is fed to connector
E15 pin 6 where the video signal is input onto the
M-Board. Here signal selection takes place as
described in the EURO 4 Technical Guide section 18
of the M-Board processing stage. The video out signal
is then fedback from the M-Board to the E-Board via
connector E15 pin 8.
This video signal is then input to pin 8 of IC601 and
output via pin 6, where the video signal is fed to the
video output, pin 19 AV2.
4.1.
Control
Control of this switching IC is performed by the
MSP3410 IC2101 pin 4, although the switching
control commands are fed from the microprocessor
IC IC1101 via the I
2
C bus to the MSP3410 IC2101.
This switching control fed from the MSP3410 IC2101
pin 4 is fed to transistor Q601 where the signal is
amplified and applied to the switching IC IC601 pin 5.
Summary of Contents for EURO 4 Chassis
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