Sony EVO-720P - Playback Frequency Characteristics; Adjustment (RP-52 P,;;FR-30 P Boards); Crystal Oscillator Fo Adjustment; REC y Level Adjustment

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B3, VIDEO ADJUSTMENT
1
hejustment
of
the
video
system
should
in
Principle
Ee
performed
in
the
sequence
below,
he
color
video
signal
supplied
by
the
pattern
enerator
is
used
as
video
input
signal
for
adjustment
f
the
video
system
for
recording
mode.
Confirm
that
the
SYNC
and
color
burst
signals
match
the
pecifications
for
adjustment
setup
in-
Fig,
8-2,
ee
[Adjustment sequence]
1)
Playback
requency
caracteristics
adjustment
2)
Flying
erase
check
3) Crystal Oscillator fo adjustment
4) "REC Y level adjustment
5) Y/C separation adjustment
16) Y comb-type filter adjustment
7) SYNC AGC adjustment
8) VIDEO OUT tevel adjustment
9) PB Y level adjustment
0) Y FM carrier frequency adjustment
1) Y FM deviation adjustment
2) Emphasis adjustment
3) 378fo VCO adjustment
4) Chroma emphasis fo adjustment
5) Carrier balance adjustment
6) GCA adjustment
7) ft VCO adjustment
8) REC Y RF level adjustment
3) REC C.RF ievel adjustment
9) REC AFM RF level check
\) REC ATF RF level check
& REC Y recording current adjustment
3) REC PCM recording current adjustment
!) Chroma signal output level adjustment
3-1, Playback Frequency Characteristics Adjustment
(RP-52P/FR-30P Board)
12 adjusting elements are shown in [ ],
LP CH1 and LP CH2 adjustment
fode
Playback
‘|
Alignment tape :
For frequency characteristics!
adjustment (WRS5-6C)
Pin © [Pin @} of CNi04
on FR-30P board
External trigger :
Pin ® of CN104
Trigger slope: +, [—]
Oscilloscope
LP side : RV103 [RV104]
on RP-52P board
‘ignat
feasurement Point
feasuring Instrument
djusting Element
3.5 MHz level; 5.5 MUlz level
pecified Value eG
Adjusting method :
1)
Adjust
the
LP
side
RVi03
on
RP-52P
board
[RV104]
so
that
the
ratio
of
the
3.58
MHz
level
and
the
$.5
MHz
level is 4: 3,
3.58 MHz
55 MHz
1 MH:
e 7 MHz
H:2 msec/div
Fig.
8-12.
Playback
frequency
characteristics
adjustment
2. SP.CH1 and SP CH2 adjustment
Mode Playback
Alignment tape :
Signal
For
frequency
characteristics
adjustment (WRS5-6C)
Pin © [Pin ©} of CN104
on FR-30P board
Measurement Point | External, trigger :
Pin @ of CN104 on
RP-S2P board
Trigger slope: ~—, [+]
Measuring Instrument | Oscilloscope
SP side : RV103 [RV104}
Adjusting Element © | O° psp tent
Specified
Value
36
Mite
level
:
5,6
MHz
level
L
$443,
Connection :
1)
Connect
TP206
on
the
SE-7P
board
(F
TAPE:
Pin
® of IC205) to GND with a jumper,
Adjusting method :
1)
Adjust
the
SP
side
RV103
on
RP-52P
board
[RV104]
so
that
the
ratio
of
the
3.58
MHz
level
and
the
5.5
MHz
level
is
4
:
3.
—319—