-5-
6.HORIZONTAL OUTPUT
A horizontal oscillation signal is output from pin37 of
IC101 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 C441/442
➞
DY
➞
Q432
➞
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 C420 and
C423 and charges them.The current stored in C420 and
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.
7. CPU
Pin description
Pin1: H-sync. input (Horizontal pulse for OSD)
Pin2: V-sync. input (Vertical pulse for OSD)
Pin3: Colour control output
Pin4: Brightness control output
Pin5: Contrast control output
Pin6: Sharpness control output
Pin7: Tint (GND)
Pin8: TV/AV output (L:AV mode)
Pin9: AV mode selection output-A
Pin10: AV mode selection output-B
Pin11: Natioal select option
Pin12: I
2
C bus SCL (Serial clock for memory)
Pin13: I
2
C bus SDA (Serial date for memory)
Pin14: Not used (+5V through pull up resistor 22K)
Pin15: Ident signal input (L:No signal)
Pin16: R/C signal input
Pin17: AV1 Scart control signal input (VTR play:L)
Pin18: AV2 Scart control signal input (VTR play:L)
Pin19: Ignor output
Pin20: 50/60Hz output
Pin21/22: GND
Pin23: Supply Ground
Pin24: Oscillator input for CPU
Pin25: Oscillator output for CPU
Pin26: Supply Ground
Pin27: Power 5V)
Pin28: Oscillator output for OSD
Pin29: Oscillator input for OSD
Pin30: Reset input
Pin31: Protect signal input (L:Power circuit defects)
Pin32: Not used(GND)
Pin33: AFT signal input
Pin34: TEXT/16:9 SELECT OPTION
Pin35: Key scan 1
Pin36: P-ON(TEXT)
Pin37: S-VHS output
Pin38: GND
Pin39: BG/I Select output
Pin40: L/L’ Select output
Pin41: NEG/POS Select output
Pin42: Not used (GND)
Pin43: 16:9/4:3 switch output
Pin44: Not used (GND)
Pin45: Not used (GND)
Pin46: Not used (GND)
Pin47: Mute output in no picture(FTZ mute)
Pin48: Power ON/OFF output (H:ON)
Pin49: Blanking output for OSD
Pin50: Not used (Open)
Pin51: Green output for OSD
Pin52: Red output for OSD