Sony BVH-2000, Operation And Maintenance Manual

Page: 340 / 505

(5-7-7. SR-15 Board)
6. V SYNC Separator
output the
color framing pulse which is input to the CF PULSE IN
connector is synchronized with the V SYNC.
Detector
H and V signals separated by the REF H separator IC3 K-7 and
the REF V separator IC4 K-7 are rectified by the CR circuit so
When and of H/V
detector goes "Low" and the result of detection is read into the
CPU with address
"5070H"
via the input port IC4M.
This circuit is configured with IC2F-12 and IC2G-6, and it
serves to compare the output of the CF phase shifter IC3B-13
6th and from video
the so
that the oscillating frequency of the VXO (Voltage Controlled
Crystal Oscillator)
is controlled
IC9-1
IC9-5
IC3F- 10(05)
IC3F- 12(07)
TPI4
IC2G- 6
The Color frame phase (CF PHASE) is detected from the
relationship between the burst and the REF H signals separated
from the input video It is output the RL board via the
-rnl111t-H"",la'va ...
on CD to CPU
BVH-2000( U/C)/PS/PM
BVH-2180(U/C)/PS/PM
CF PHASE DETECTOR (NTSC)
REF SYNC
IC3M-:;
TP17
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SIG.F
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IC3C-B
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TP16
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,
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,------
-
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I TP16
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\_-----
IC4E-6
'-_.
__
._._--_._--_._--
----- --- -
-----_._--_._--_._----'
C F PHASE DETECTOR ( PAL)
("---------
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REF SYNC
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IC3M-3
10
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TP13
liNT SC
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IC2C-7
IC4E -6
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01-GATE
5-7-17 SERVO SYSTEM
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