Sony BVM-1911 Operation And Maintenance Manual page 125

18-2-3. BT Board Band-pass FIiter Adjustment
(Adjust only when Dls3, 5, 6 and 8 are replaced.)
Sweep signal
SIGNAL GENERA TOR
• Tektronix 1410
VIDEO A
terminal
l. Feed a sweep signal to the VIDEO A INPUT terminal 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 I.
4. Adjust the frequency characteristics using DL3 on the BT
board so that the waveform becomes symmetrical as shown
in Fig. J 8-5 with 3.58 MHz as center frequency.
5. Connect the oscilloscope to TP12.
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 TPJ 3.
8. Adjust the frequency characteristics using DL8 on the BT
board so that the waveforms becomes symmetrical as shown
in Fig. 18-5 with 3.58 MHz as center frequency.
9. Connect the oscilloscope to TP3.
10. Adjust the frequency characteristics using DLS on the BT
board so that the waveforms becomes symmetrical as shown
in Fig. 18-5 with 3.58 MHz as center frequency.
BT board
0
0
~~
~~
TP3 0
DL5
~
D
.......,
0
DL6
0
ODD
~o
DL3 DL8
TP11
00 0 0
4-55
0
0
0
BT
board
TP3
TP11
TP12
TP13
·®D®
@)
@) @)
Oscilloscope
AB A= B
Fig. 18-6
SUB CONTROL PANEL (HY board)
0 0
OD
0
BLUE
GREEN RED
0 0
OD-
0
POSITION -LEVEL -ADJUST
oOmuP
I
D2
D1
0 0
~
0
C
MARKER
0
OFILTER
0
OMA.TRIX
,---
ASU
,---
CHROMA
/PHASE •
o;~A~ F
0
COMBS
MEM3
WHITE
BAL R3
0 ocROSS
HATCH
0 0
,---
QoAJN
Qa1AS
ROB YW
0 0
TEST B
0 0
EXT
0
SECAM PAL
0 0
COMB
0
0
0
CODED
1QWHJTE
20 GRAY
0
0
0
3OFORMAT
A
0
401NPUT
INT
0 sQsYNC
NTSC
o
sQsvSTEM
TRAP
0
1Qvc SEP
MEM2 MEM1 005/D93
R2 RI RO
0 0
0
sQ"ml:E
16; 9
4: 3
0 O~lEN
CONFIGURATION
0 0
sQAsPECT
f5 SEL
REMOTE
0
0
oQ~f~fE
RESET ENT ESC
0 0 0
QMENU
AUTO SETUP
0
18-2-4. BT Board Clock fo Adjustment
1. Connect the frequency counter to TPJ4. .,
2. Make adjustment as shown below using CV6 (CLK FREQ)
on the BT board.
• fo=21.477 MHz
BT board
0
0
~~
~
~~
0
[01
0
~
[0jo
4-56
0
0
Frequency counter
0
TP140
0
0
0
~
o0
~~[0]
0 0
0
0
00
0