Philips EM7U LCOS, Руководство по обслуживанию

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HIP (High end Input Processor) CIRCUIT (Figure 35)
The IF from the Main Tuner and selected composite or SVHS signals is fed to the HIP IC
7323 located on the SSB. This IC is controlled by the SDA-F and SCL-F, fast bus, from the
OTC (Microprocessor) located on the SSB. The IF signal is fed to 1408, SAW Filter, and then
to Pins 2 and 3 of 7323. The detected video is output on Pin 10 of 7323 and buffered by
Transistor 7411. The video signal is fed to 1411, separating the 4.5MHz Audio signal. This
signal is buffered by 7410 before being fed to the Audio processor. The video is also fed to
1407, a 4.5MHz Sound Trap, buffered by Transistor 7322, and fed to Pin 14 of 7323. If the
user has selected the Tuner as the main picture, 7323 will switch the composite video to Pin
26. The video is then buffered by Transistor 7320 before being output to the 3D Comb Filter
board. YC from the Comb Filter board is then fed back to 7323 via Pins 28 and 29. If the
user has selected external composite video, this signal is fed into 7323 on Pin 20. If the user
has selected an external SVHS signal, the YC signal is fed to 7323 via Pins 20 and 21. The
selected Y signal is fed to a delay and the selected C signal is fed to a demodulator that con-
verts the signal to a UV signal. The YUV switch selects from the internally decoded video or
the external YUV from the Y Pb Pr inputs. The YUV signal is then fed to the PIP/DW circuit
for insertion of the Picture in Picture or Split screen. Horizontal Sync is output on Pin 60
while Vertical Sync is output on Pin 61.
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