18
Fig5
6. VIDEO AMP. CIRCUIT
A. VIDEO PRE. AMP.
The video pre-amp IC is U201(LM1269). The input signal is 0.7Vpp, then pre-amp IC U201
amplify the video signal to 3~4Vpp. The U201 is controlled by up via I
2
C bus, Fig5 is the
block diagram.
B. VIDEO AMPLIFIER
The video amplifier is U203(LM2467), it amplify video signal to about 40Vpp. Video
output signal add to cathode by AC coupling, Fig6 is the block diagram.. The DC bias is
controlled by the IC U204(LM2480), Fig7 is the block diagram..
Fig 6 is the block diagram
Summary of Contents for AF705
Page 1: ...1 AF705 Service Guide 17 inch CRT Monitor ...
Page 7: ...7 2 CONTROL AND CONNECT LAYOUT A Main PCB ...
Page 8: ...8 B VIDEO PCB ...
Page 12: ...12 Fig2 ...
Page 16: ...16 Fig3 ...
Page 17: ...17 Fig4 ...
Page 19: ...19 Fig7 Fig6 ...
Page 20: ...20 7 TROUBLESHOOTING A POWER SUPPLY CHECK ...
Page 21: ...21 B MONITOR CHECK FLOW CHART B 1 No Raster ...
Page 22: ...22 B 2 No Picture ...
Page 23: ...23 B 3 No Vertical Deflection rester become a horizontal line ...
Page 24: ...24 APPENDIX A PARTS LIST ...
Page 57: ...57 432 2 MAB2008540 7 0 02 4 TAPING SCREW TPB 4 0 20C MC ...
Page 58: ...58 APPENDIX B P C B ASSEMBLY ...
Page 59: ...59 2 3 ...
Page 60: ...60 ...
Page 61: ...61 ...
Page 72: ...72 ...
Page 76: ...76 APPENDIX C DISPLAY UNIT ASSEMBLY ...
Page 77: ...77 ...
Page 80: ...80 APPENDIX D CRT YOKE ASSEMBLY ...
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