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P990+ Technical Service Manual
Critical Parts Specification
TDA4841
FEATURES
Concept features
• Full horizontal plus vertical autosync capability
• Extended horizontal frequency range from 15 to 130kHz
• Comprehensive set of I
• Very good vertical linearity
• Moire cancellation
• Start-up and switch-off sequence for safe operation of all power components
• X-ray protection
• Power dip recognition
• Flexible switched mode B+ supply function block for feedback and feed forward converter
• Internally stabilized voltage reference
• Drive signal for focus amplifiers with combined horizontal and vertical parabola waveforms
• DC controllable inputs for Extremely High Tension (EHT) compensation
• SDIP 32 package.
Synchronization
• Can handle all sync signals (horizontal, vertical, composite and sync-on-video)
• Output for video clamping (leading/trailing edge selectable by I
protection blanking
• Output for fast unlock status of horizontal synchronization and blanking on grid1 of picture tube.
Horizontal section
2
• I
C-bus controllable wide range linear picture position, pin unbalance and parallelogram correction
via horizontal phase
• Frequency locked loop for smooth catching of horizontal frequency
• Simple frequency preset of f
• Low jitter
• Soft start for horizontal and B+ control drive signals.
Vertical section
2
• I
C-bus controllable vertical picture size, picture position, linearity (S-correction) and linearity balance
2
• Output for I
C-bus controllable vertical sawtooth and parabola (for pin unbalance and parallelogram)
• Vertical picture size independent of frequency
• Differential current outputs for DC coupling to vertical booster.
• 50 to 160Hz vertical autosync range.
East-West (EW) section
2
• I
C-bus controllable output for horizontal pincushion, horizontal size, corner and trapezium
correction
• Optional tracking of EW drive waveform with line frequency selectable by I
Focus section
2
• I
C-bus controllable output for horizontal and vertical parabolas
• Vertical parabola is independent of frequency and tracks with vertical adjustments
• Horizontal parabola independent of frequency
• Adjustable pre-correction of delay in focus output stage.
2
C-bus driven geometry adjustments and functions, including standby mode
and f
by external resistors
min
max
2
C-bus), vertical blanking and
--20--
2
C-bus.
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