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6. HORIZONTAL OUTPUT
A horizontal oscillation signal is output from pin37 of
IC201 and switches the drive transistor Q431. This
switching signal is current amplified by the drive
transformer T431 and drives the output transistor Q432.
When Q432 becomes ON, an amplifying current flows
directly to DY through C441 --) DY --) 0432 + GND,
and defection is performed in the last half of the
scanning period. Next, when Q432 becomes OFF, the
charge that had been stored in DY up to that point
releases a resonance current to the resonant capacitors
C421/C423 and charges them. The current stored in
C421/C423 is then flowed back to DY, and an opposite
charge is then stored in DY. This opposite charge then
switches the dumper diode in Q432 ON, the resonance
state is completed, and an amplifying current is then
flowed again directly to DY through the dumper diode.
By this means, deflection in the first half of the scanning
period is performed, and when Q432 becomes ON at
the end of the first half of the scanning period, deflection
during the last half is begun, thus completing one cycle.
In the PCC circuit consisting of Q461 and Q462, the
parabola signal supplied from the vertical circuit is
added at the horizontal output stage and pincushion
compensation is performed by varying the DC voltage
bias. Further, the ABL voltage is feedback to the base
of Q462 to compensate for width variations due to
variations in the beam current.
7. CPU <System and Teletext Control>
Pin description
Pin1 : Tuning voltage output
Pin2: Brightness control output (6-bit DAC)
Pin3:
Contrast control output (6-bit DAC)
Pin4: Colour control output (6-bit DAC)
Pin5: Sharpness control output(6-bit DAC)
Pin6: Not used (GND)
Pin7: Not used (GND)
Pin8: Power ON/OFF output (H:ON)
Pin9: AFT signal input
Pin10: Option SW1 & Keyboard scan input (DC)
Pin1 1: Option SW2
Pin12: 50/60Hz switch input (50Hz: Hi)
Pin13: GND
Pin14: TV/AV switch output (TV: Hi)
Pinl5: S-VHS switch output (S-VHS: Hi)
Pin16: Option SW3 (2AV: Hi)
Pin17: Function signal input for SCART1
Pin18: Function signal input for SCART2
Pin19: Power LED drive output1
Pin20: Option SW4 & Power LED drive output2
Pin21 : Ignore output
Pin22: GND
Pin23: CVBS input0 (Internal)
Pin24: CVBS input1 (Internal/External)
E6LM/MM
Pin25: Black
Pin26: IREF
Pin27: Odd/Even output
Pin28: GND
Pin29: -
Pin30: V-deflection stop output
Pin31: RGB REF
Pin32: Blue output for OSD
Pin33: Green output for OSD
Pin34: Red output for OSD
Pin35: Blanking output for OSD
Pin36: H-sync. input (Horizontal pulse for OSD)
Pin37: V-sync. input (Vertical pulse for OSD)
Pin38-39: Supply (+5V)
Pin 40: OSC GND
Pin 41: Oscillator input for CPU
Pin 42: Oscillator output for CPU
Pin 43: Reset input
Pin 44: Supply (+5V)
Pin 45: Protect signal input (L:Power circuit defects)
Pin 46: Ident. signal input
Pin 47: R/C signal input
Pin 48: Mute output in no picture
Pin 49: IX bus SCL (Serial clock)
Pin 50: 1% bus SDA (Serial date)
Pin 51: Option SW5 & Band select output1
Pin 52: Band select output2
-5-
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