8-4
2) Video Signal Amplification Section
The video signal amplification section basically consists of the input section circuit and the amplification circuit.
Each Red(R), Green(G) and Blue(B) video signal circuit is identical to each other, the G circuit being described
below.
The video signal through the input selection circuit is input the amplification circuit. The amplification circuit
is constructed with IC711(Pre-amp), Q711G(buffer), IC721(Output amp).
IC711 controls CONTRAST and R/G/B GAIN with I
2
C BUS by CPU. Only ABL function is controlled by
external DC voltage. IC711 is possible to change gain, it is approx.4.3 after the video adjustment.
The output of IC711 is buffered by Q711G and fed to IC721(Output amp).IC721
’
s gain is fixed approx.15.
Rs and Cs connected IC721 pin 13 form emitter peaking. On American version, emitter peaking effect
changes 4 levels by Q721G, Q722G and Q723G. On European version, that changes 2 levels by Q721G.
Only American version
(Fig 1.2) Video Amplification Circuit
IC711
M52742ASP
R736G
IC801
CPU
C712G
C711G
15
11
23
29
25
26
ABL
CLAMP PULSE
R724G
IC721
VPS16
+12V
R722G
R718G
From
Input
Selection
Circuit
To
CRTCathode
C729G
12
14
13
C72EG
C722G
R717G
R716G
Q711G
R723G
C723G
C72AG
R725G
Q723G
Q722G
SHARPNESS3
SHARPNESS2
SHARPNESS1
Q721G
R727G
R726G
R719G
I
2
C BUS
24
R72HG
R72KG
G
A
IN
ADJ
U
ST
Summary of Contents for MultiSync FP1370
Page 13: ...4 4 REMARK SYMBOL Mount the EMF PWB 121E REMARK SYMBOL Clamp the connector ...
Page 14: ...4 5 REMARK SYMBOL COIL FORMING UPPER SIDE REMARK SYMBOL COIL FORMING LOWER SIDE ...
Page 23: ...4 14 REMARK SYMBOL REMARK SYMBOL Clamp CN CA CN CC and CN D with CLAMPER WIRE ...
Page 26: ...4 17 REMARK SYMBOL Clamp the wires SAFETY REMARK SYMBOL Clamp the wires CN ASD CN AF 21 ...
Page 80: ...5 51 Fig 3 11 CONV PWB Fig 3 12 EMF PWB CN EMF CN LL CN RR CNEM CN CA CN D CN CCB HS8N1 ...
Page 143: ...8 18 15V 80V AFC D FOCUS Fig 3 1 HIGH VOLTAGE CIRCUIT AND PROTECTOR CIRCUIT ...
Page 260: ...10 1 ...
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