Sony BVM-1916 Operation And Maintenance Manual page 107

18-2-3. BT Board Band-pass FIiter Adjustment
(Adjust only when Dls3, 5, 6 and 8 are replaced.)
Sweep signal
VIDEO A
terminal
SIGNAL GENERATOR
• Tektronix 1410
I. Feed a sweep signal to the V!OEO A INPUT tenninal of
this set.
2. Set the PAL S/SECAM F/COMB S button on the front
panel to the ON.
3. Connect the oscilloscope to TPl l.
4. Adjust the frequency characteristics using DL3 on the BT
board so that the wavefonn becomes symmetrical as shown
in Fig. 18-5 with 3.58 MHz as center frequency.
5. Connect the oscilloscope to TPI 2.
6. Adjust the frequency characteristics using DL6 on the BT
board so that the waveform becomes symmetrical as shown
in Fig. 18-5 with 3.58 MHz as center frequency.
7. Connect the oscilloscope to TP13.
8. Adjust the frequency characteristics using DL8 on the BT
board so that the wavefonns becomes symmetrical as shown
in Fig. 18-5 with 3.58 MHz as center frequency.
9. Connect the oscilloscope to TPJ.
10. Adjust the frequency characteristics using DL5 on the BT
board so that the wavefonns becomes symmetrical as shown
in Fig. 18-5 with 3.58 MHz as center frequency.
BT board
0
0
~~
0~
~
TP3 0
DL5
~
D
---
0
DL6
0
DOD
~o
DL3
DLB
TP11
0 00
0
4-53
0
0
0
BT board
BT
board
TP3
TP11
TP12
TP13
®D®
@)
@
@
Oscilloscope
AB A -
B
Fig. 18-6
SUB CONTROL PANEL (HY board)
0
0
0
0
OD
----;-~---=--------;:--------,
Q
QGA1N
Q
1Qw1--m
BLUE
GREEN
,rn
0 0
00 0
OBIAS
0
20
GRAY
POSITION -LEVEL -ADJUST
°'
OOPIC 0
SETUP
D1 ROD YUV
coorn
0 0 0 0
;QFORMAT
0
~'
TEST B A
0 0 0
4O1NPUT
EXT INT
0
0
FILTER
O
o
sQsYNC
0
0
MATRIX
~
~,
~
SECAM PAL NTSC
0 0 0
6 QsYSTEM
CHROMA
/PHASE
•
omA~F
0
COMB S
WIIITE
MEM3
COMB SAAS
0
0
7Qvc SEP
M[M2 MEMI D65/091
MC
" " e,
so
0
o~~i~
0 0 0 0 0
6 O~1IE
~
Q
O
i~WcN CONFIGURATION
16. 9
0
o o
REMOTE
0
0
O~f~YE
RESET ENT [SC
0 0 0
'---------'""""'-"""'""'-----'------o
18-2-4. BT Board Clock lo Adjustment
I. Connect the frequency counter to TPI4. .
1
2. Make adjustment as shown below using CV6 (CLK FREQ)
on the BT board.
• fo::::21.477 MHz
BT board
0
0
~~
~
~~
0
~
0
~
~o
4-54
BT board
0
0
Frequency counter
0
TP140
0
0
cvs(S)
~
o0
~~[QI
0 0
0
0
00
0