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Bk Board - Sony BVM-1911 Operation And Maintenance Manual

Trinitron color video monitor.
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3-6. BK BOARD
Following are described about Red channal. Green and Blue channel
are the same.
3-6-1. Red Drive Amplifier, Red Buffer
This circuit drives final stage of video output
amplifier. Gain is
approx. 2
3-6-2. Red Video Output Amplifier and Buffer
This is the final stage amplifier to obtain amplitude
enough to drive
GlofCRT.
Gain is approx. 14
Also in this amplifier. BLANKING pulse is mi,ed with video signal.
3-13
BLOCK DIAGRAM
OF BK BOARD
R IN
RCL .B
R.
DRIVE
G IN
G CL. B
G DRIVE
B !N
B.CL. B
B,DRIVE
·150V
QIOI, 102
R DRIVE AMP
(VIOi
FREQ
0201, 202
G DRIVE AMP
CV201
FREQ
0301,302
8 DRIVE AMP
CV301
FREQ
Q 12, 13, I( I
-l50V
RIPPLE
FILTER
0l03-105
D 101,102
R BUFF
0203~205
0201,202
G BUFF
C303N 305
0301,302
8 BUFF
-150V
0115
BLANKING
PULSE BUFF
0215
BLANKING
PULSE BUFF
Q3l5
BLANKING
PULSE BUFF
0106,107
01os~111
0103~106
D107, 108
QI 13
0114
QI 12, 0109
R VIDEO OUT
R NFS
CLAMP
R GI 8 IAS
R BUFF
AMP
BUFF
PULSE BUFF
CLAMP
ROUT
CV102
FREQ
0206,207
0208- 211
0203 "'206
0207,208
0213
0214
0212, 0209
G VIDEO OUT
G NFS
CLAMP
G GI BIAS
G
BUFF
G OUT
AMP
BUFF
PULSE BUFF
CLAMP
CV202
FREQ
0306,307
Q308~31I
D303~306
D307, 308
0313
0314
Q312,D309
B VIDEO OUT
B NFB
CLAMP
B GI BIAS
B BUFF
8 OUT
AMP
BUFF
PULSE BUFF
CLAMP
CV302
FREQ
H.V.BLK
QI, DI, 2
PULSE
DETECT
AFC. P
BK
( VIDEO OUT AMP)
3-14

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