Sony BVM-1916 Operation And Maintenance Manual page 108

18-2-5. BT Board 0H/1H, 1H/2H MIX Adjustment
I.
2.
3.
4.
5.
Color bar (REVERSE) signal
VIDEO A
terminal
SIGNAL GENERATOR
, Tektronix 1410
Feed a color bar signal (REVERSE) to the VIDEO A
INPUT terminal of this set.
Connect the oscilloscope to TP6 to magnify the signal
inverted area.
Tum RVS (0H/!H MIX LEVEL) and RVIO (0H/IH MIX
PHASE) on the BT board until the portion shown in Fig.
18-7 is reduced to a minimum.
Connect the oscilloscope to TP7.
Tum RVIZ (IH/2H MIX PHASE) and RV! I (IH/2H MIX
LEVEL) on the BT board until the portion shown in Fig.
18-7 is reduced to a minimum.
Enlarged view of inverted s·1gnal section
Enlarged
a
Fig. 18-7
4-55
BT
board
TP6
TP7
®D®
®
@ @
Oscilloscope
BT board
0
[el
0
RV10
~
[eJ RV12
0
0
0
0
0
TP?O
Q
RV11
RVS [eJ0]
~
0 0 O
18-2-6. BT Board Y/C MIX Adjustment
I.
2.
3.
4.
SIGNAL GENERA TOR
, Tektronix 1410
[
FULL FIELD ]
WHITE REF 75%
AMPL 75%
Color bar signal
Feed a color bar signal to the VIDEO A INPUT terminal of
this set.
Connect the oscilloscope to TP2 on the BT board.
Set the PAL S/SECAM F/COMB S button on the sub
control panel to the OFF.
Tum RV! (Y/C MIX PHASE) and RV2 (Y/C MIX LEVEL)
on the BT board so that the sub-carrier level is reduced to a
minimum as shown in Fig. 18-8.
Fig. 18-8
[eJ
0]0 TP6
0 00
o
SUB CONTROL PANEL (HY board}
0 0
0 0
0 0
Oil
0
OGAIN
0
1
0
Wl11TE
BLUE GREEN
'"
0 0
0-()
0
OBIAS
0
2Q GRAY
POSITION -LEVEL -ADJUST
0,
"
ooa
,w
CODED
OOPIC
0 0 0 0 0
3OFORMAT
SETUP
~
TEST
a
'
0
'
0 0 0
4O1NPUT
"""'"
m
'"
0
0 FILTER
0 0
sQSYNC
SECAM '" '"'
-
0
0 MATRIX
~
0 0
o
sQsYSTEM
'"'™'
/PHIISE OOMS
,=
•
o~~~f
0 0
0
7QYC SEP
COMB S
Wl11TE MEMJ MC_, MEM1 D65/D93
"" "" "' " "
0
0
CROSS
1-lATCH
0 0 0 0 0
aQwe~?
-
16, 9 4, 3
0
osPuT
CONFIGURATION
0 0
9OASPECT
SCREEN
{5
sec
RE~TE
0
0
oQ~f~~
RESET
'"
,so
0 0 0
QMENU
0
AUTO SETUP
0
BT board
VIDEO A
4-56
BT board
TP2
o®[~J®
®
@ @
Oscilloscope
18-2-7. S COMB Adjustment
1. Feed a color bar signal to the VIDEO A INPUT terminal of
this set.
2. Set the PAL S/SECAM F/COMB S button on the sub
control panel to the ON.
3. Connect the oscilloscope to TP2 on the BT board.
4. Tum RV6 (S COMB C Level) and RV7 (S COMB C
PHASE) on the BT board so that the sub-carrier level is
reduced to a minimum as shown in Fig. 18-8.
BT board
TP2
0 RVt
0
~~
IS)
0RV2
~
0
-
~
0
0
RV?
RV6~0
0 00
0