Iiyama Vision Master Pro 451, Руководство по обслуживанию

Страница: 30 / 74

- 25 -
4-4. HORIZONTAL DEFLECTION circuit
(1) HORIZONTAL DRIVE circuit
The horizontal drive pulse output from pin 17 of IC350 is amplified by Q504 and T502 and then supplied to Q503
(H-OUT) base as a current.
The current is amplified by Q503 and then supplied to the deflection yoke as a horizontal deflection current to
control the horizontal deflection.
(2) HORIZONTAL LINEARITY CORRECTION circuit
The switching signal from IC301 controls H-LIN-COIL (L503, L504 and L507), S-correction capacitor (C510,
C511, C512, C513, C514 and C557) and FET-ARRAY (IC502), and then correct linearity every frequency.
CS5
(Pin 16)
LOW
HIGH
LOW
HIGH
HIGH
LOW
LOW
LOW
HIGH
LOW
HIGH
HIGH
CS1
(Pin 6)
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
CS2
(Pin 7)
LOW
HIGH
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
CS3
(Pin 9)
LOW
LOW
LOW
LOW
HIGH
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
CS4
(Pin 15)
LOW
HIGH
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
HIGH
HIGH
HIGH
IC301 output pin
CS6
(Pin 17)
LOW
HIGH
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
LOW
LOW
HIGH
H-LIN1
(Pin 34)
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
fH (kHz)
30.0 - 34.0
34.1 - 41.0
41.1 - 45.0
45.1 - 49.0
49.1 - 59.0
59.1 - 66.0
66.1 - 73.0
73.1 - 84.0
84.1 - 88.5
88.6 - 97.0
97.1 - 115.0
115.1-130.0
Each switching point performs horizontal linear and distortion correction as follows:
H-LIN2
(Pin 25)
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
DRIVE
(Pin 26)
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
Q504 Gate input
(10V/div)
Q504 Drain output
(20V/div)
Q503 corrector output
(200V/div)