There is a current source inside the UOC at pin 102. This pumps energy in the capacitor
connected to this pin producing a pure saw tooth. The vertical drive signals and the E/W
correction signal are derived.
Pin 108 is the East-West drive (or AVL), and it is a single ended current output. The
correction for “horizontal width for changed EHT” from this pin is available by setting the
HCO bit to “1”.
The Phase-2 Compensation available at pin 113 gives frame correction for high beam
currents. The phase compensation signal is used to correct the phase of the picture
from the horizontal drive signal.
Pin 63 is the SANDCASTLE output (contains all sync info) and also HORIZONTAL
FLYBACK (HFB) input.
Pin 97 is the EHT tracking/over-voltage protection pin. The HCO bit can switch on the
tracking on EW. If the voltage at pin 97 exceeds 3.9 V, the over-voltage protection will
be activated and the horizontal drive is switched “off” via a slow stop.
Horizontal Deflection
There are several executions (depending on the CRT):
•
Sets with no East-West correction.
The principle of the horizontal deflection is
based on the quasi-diode modulation circuit. This horizontal deflection circuit
supplies the deflection current and auxiliary voltages from the LOT.
•
Sets with East-West correction.
The principle of the horizontal deflection is based
on a diode modulator with east-west correction. This horizontal deflection circuit
supplies the deflection current and auxiliary voltages from the LOT.
•
Sets with dynamic East-West correction.
The principle of the horizontal deflection
is based on a diode modulator with dynamic east-west correction for picture
tubes with inner pincushion. This horizontal deflection circuit supplies the
deflection current and auxiliary voltages from the LOT.
Summary of Contents for 29PT6441/85
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Page 35: ...Figure Service position Mono Carrier ...
Page 69: ...Power Supply Set Not Working Figure Fault finding tree Set not working ...
Page 70: ...Set Does Not Start Up Figure Fault finding tree Set does not start up ...
Page 73: ...Blank Screen Figure Fault finding tree Blank screen ...
Page 76: ...Picture Ok No Sound Figure Fault finding tree Picture ok no sound ...
Page 77: ...Unable To Perform Tuning Figure Fault finding tree Unable to perform tuning ...
Page 80: ...Audio Processing No Sound Figure Fault finding tree No sound ...
Page 83: ...Hardware Alignments Figure Top view family board ...
Page 86: ...Software Alignments and Settings Figure Service Mode overview ...
Page 118: ...Figure Geometry alignments ...
Page 172: ...All Models 7661 Chassis Overview ...
Page 173: ...All Models 7661 Power Supply A1 ...
Page 174: ...All Models 7661 Deflection A2 ...
Page 175: ...All Models 7661 Tuner IF A3 ...
Page 176: ...All Models 7661 Hercules A4 ...
Page 177: ...All Models 7661 Features Connectivities A5 ...
Page 178: ...All Models 7661 Class D Audio Amplifier A6 ...
Page 179: ...All Models 7661 Audio Amplifier A7 ...
Page 180: ...All Models 7661 Rear I O Cinch A8 ...
Page 181: ...All Models 7661 Front Control A9 ...
Page 182: ...All Models 7661 DVD Power Supply A10 ...
Page 183: ...All Models 7661 CRT Panel B1 ...
Page 184: ...All Models 7661 Eco Scavem B2 ...
Page 185: ...All Models 7661 Side AV Headphone Panel D ...
Page 186: ...USED ONLY IN MODELS 25PT6341 85 7661 Side Jack Panel Wide ...
Page 188: ...USED ONLY IN MODELS 27MS6341 37 32MS6341 37 7661 Top Control Panel Round ...
Page 190: ...NOT USED IN MODELS 27ST6210 27 7661 LTI CTI Interface Panel H ...
Page 192: ...USED ONLY IN MODELS 27ST6210 27 7661 EPS Module ...
Page 193: ...USED ONLY IN MODELS 27ST6210 27 7661 SP LS Module ...
Page 194: ...USED ONLY IN MODELS 27ST6210 27 7661 ITV Interface Module ...
Page 195: ...All Models 7661 Layout Mono Carrier Top Side ...
Page 196: ...All Models 7661 Layout Mono Carrier Overview Bottom Side ...
Page 197: ...All Models 7661 Layout CRT Panel Top Side ...
Page 198: ...All Models 7661 Layout CRT Panel Bottom Side ...
Page 199: ...All Models 7661 Layout Side AV Headphone Panel Top Side ...
Page 200: ...All Models 7661 Layout Side AV Headphone Panel Bottom Side ...
Page 201: ...USED ONLY IN MODELS 25PT6341 85 7661 Side Jack Panel Wide Top Side ...
Page 202: ...USED ONLY IN MODELS 25PT6341 85 7661 Side Jack Panel Wide Bottom Side ...
Page 205: ...USED ONLY IN MODELS 27MS6341 37 32MS6341 37 7661 Top Control Panel Round Top Side ...
Page 206: ...USED ONLY IN MODELS 27MS6341 37 32MS6341 37 7661 Top Control Panel Round Bottom Side ...
Page 208: ...NOT USED IN MODELS 27ST6210 27 7661 Layout LTI CTI Interface Panel Top Side ...
Page 209: ...NOT USED IN MODELS 27ST6210 27 7661 Layout LTI CTI Interface Panel Bottom Side ...
Page 212: ...USED ONLY IN MODELS 27ST6210 27 7661 EPS Module Top Side ...
Page 213: ...USED ONLY IN MODELS 27ST6210 27 7661 SP LS Module Top Side ...
Page 214: ...USED ONLY IN MODELS 27ST6210 27 7661 SP LS Module Bottom Side ...
Page 215: ...USED ONLY IN MODELS 27ST6210 27 7661 ITV Interface Module Top Side ...
Page 216: ...USED ONLY IN MODELS 27ST6210 27 7661 ITV Interface Module Bottom Side ...
Page 217: ...All Models 7661 Testpoint Overview Mono Carrier ...
Page 218: ...All Models 7661 Testpoint Overview CRT ...
Page 219: ...All Models 7661 Testpoint Overview LTI Panel ...
Page 220: ...All Models 7661 Wiring Diagram ...
Page 221: ...All Models 7661 Block Diagram Supply and Deflection ...
Page 222: ...All Models 7661 Block Diagram Video ...
Page 223: ...All Models 7661 Block Diagram Audio Control ...
Page 224: ...All Models 7661 I2C and Supply Voltage Overview ...