Caple C702G Manual de servicio Pagina 129
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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
A
BL
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
GAIN ADJUST
- SERVICE MANUAL 1
- PRODUCT SAFETY CAUTION 3
- CONTENTS 4
- SPECIFICATIONS 5
- CONTROLS 6
- SERIAL NUMBER INFORMATION 9
- ASSEMBLY 10
- Mount the EMF PWB 13
- Clamp the connector 13
- Insert a pencil between PLATE 21
- SHIELDING CRT ASSY and CN-CL 21
- CN-LEB as per sketch 21
- Clamp CN-CA, CN-CC 23
- ADJUSTMENT PROCEDURES 30
- Magnetized Pattern Example 32
- MultiSync 33
- OSD MENU (S) 36
- OSD MENU (U) 38
- ADJUSTMENT ITEMS 40
- [A] Pre-Adjustment 41
- [B] Initial Settings 41
- [C] Main Adjustment 41
- Center line 50
- XLeft XRight 52
- 45 +0/-1 55
- Vertical Cycle 59
- [D] Reference 65
- 16 VESA 1280*1024@60H 69
- 21 VESA 1280*1024@75Hz 70
- VESA 1920*1440@75Hz 70
- 25 H.HOLD1 70
- 640*480@140Hz 72
- 1280*1024@70Hz 73
- 1024*768@100Hz 73
- 800*600@120Hz 73
- 640*480@160Hz 73
- 800*600@140Hz 73
- Fig.3-1 SW/HV PWB 76
- Fig.3-2 CONT PWB 76
- Fig.3-3 SW PWB 76
- Fig.3-9 DEF PWB 79
- Fig.3-10 OSC PWB 79
- Program Disk 81
- TROUBLE SHOOTING 89
- 1. NO RASTER 90
- 3. UNSTABLE 96
- 5. ABNORMAL PICTURE 99
- 110
- 8. SELF TEST ERROR 112
- 10. RASTER ROTATION ERROR 113
- 14. MOIRE CANCEL FAILURE 121
- 15. PLUG & PLAY FAILURE 122
- 16. OUT OF Cg-SPECIFICATION 123
- 17. USB CIRCUIT FAILURE 124
- CIRCUIT DESCRIPTION 126
- 1. VIDEO CIRCIT 128
- SUB_BIAS 130
- BLANKING 130
- 2. DEFLECTION CIRCUIT 132
- Q571 H.LINEARITY2 136
- H.LINEARITY1 136
- Horizontal Frequency 136
- H.Out Trans 138
- +B Modulator 138
- PWM Chopper 138
- V SAW Input 141
- 3. HIGH VOLTAGE CIRCUIT 142
- 4. BLANKING CIRCUIT 144
- 5. DYNAMIC FOCUS CIRCUIT 145
- 6. CPU CIRCUIT 147
- BNC/D-SUB 152
- 22pin voltage 166
- BOTTOM LEFT 186
- BOTTOM RIGHT 186
- 11. USB CIRCUIT 187
- 12. AUTO ADJUST CIRCUIT 188
- REPLACEMENT PARTS LIST 189
- MAIN CPU 265
- for Human Potential 266
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