Sony DXC-637 - HF Offset Adjustment; HF Aliasing Adjustment

3-5-12.
HF
Offset
Adjustment
3-5-13.
HF
Aliasing
Adjustment
Object:
Grayscale
chart
Object:
Multi-burst
chart
Equipment:
Oscilloscope,
Waveform
monitor
Equipment:
Waveform
monitor
To
be
extended:
PR-209
board
Preparation:
@RV5
(DTL
LEVEL)/IE-47
board
—
Fully
clockwise
Adjustment
Procedure
@RV7
(HF
LEVEL)/IE-47
board
-
Fully
clockwise
Q
1.
Chart
frame
=
Underscanned
monitor
frame
Test
point:
VIDEO
OUT
2.
Test
point:
VIDEO
OUT
Adjustment
Procedure
Adjusting
point:
Lens
iris
1.
Chart
frame
=
Underscanned
monitor
frame
Specification:
White
peak
Level
“A”
2.
Test
point:
VIDEO
OUT
= 100 + 2 IRE (for NTSC) Adjusting point: Lens iris
=
700
+
10
mV
(for
PAL)
Specification:
A
=
80
+2
IRE
(for
NTSC)
i
560
+
10
mV
(for
PAL)
3.
Adjust
@RV6
(HF
OFFSET)/IE-47
board
so
that
the
DC
offset
level
at
TP10
(GND:
E1)/E-47
board
is
0
+
10
mV.
3.
Adjusting
point:
@RV12
(HF
ALIAS)/IE-47
board
Specification:
B=
Minimum
(To
get
the
following
picture,
set
the
LINE
SEL
switch
on
the
waveform
monitor
to
“15
LINES”.
Select
the
center
of
.
ra
«
the
monitor
screen
by
using
the
VAR
control
of
LINE
SEL.
)
<y
Ete
x
(
ye
ee
feo:
100
it
wih
Note: After adjustment, carry out “3-5-16. DTL Crispening/
Aliasing Adjustment”.
IE-47
BOARD
—
COMPONENT
SIDE
—
CN1
eee
[_ Jous Pe
oO
avig Eitr4
(HF OFFSET) (HE ALAS) [res
6
FL2
is @ LJ avis2 Orvia
QHLEV) (iHLEV)
DL6 CJ Rvs [tes ee (
(DTL ALIAS)
DL2
@ Teo Dua
RV7 Cotes
(HELEV) 5 lie FL
TPIT @ICRISP.)
oO oK Gav ni LeV) EJ
Tee TPT (BLK. BAL.) @
TP9
RVI0
o (LEV. DEP.)
oy TPI
@__Ave (HF PHASE) o
St (DTL CLIP)
fe: @ Rv
(PHASE!)
RV5 RV3
(DTLLEV.) (HIV RATIO)
DXC-637 (UC)
DXC-637P
(EK)
3-15