8-12
5) Horizontal Size Control Circuit
Horizontal size is controlled by power-supply voltage for a horizontal deflection made using PWM method.
The horizontal size is controlled by two methods. One is H-SIZE which can be adjusted with a user menu,
and the other is H-SIZE MAX which can be adjusted only with a service menu. The horizontal size control
circuit consists of the circuit shown in the following.
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Saw-tooth-wave form generator
!
Switching pulse generator
!
PWM Chopper
!
+B modulation circuit
A saw-tooth wave form is generated inside IC592 . Its frequency is depend on horizontal drive pulse signal
input at pin 8 and its slope is decided by the time constant of R59J and C598. The waveform can be monitored
at pin 3.
Horizontal size control voltage is compared with reference voltage from pin 6 of IC592, output is fed into
pin1 of IC592. On the other hand, horizontal maximum size control voltage is compared with AFC feedback
voltage and then output is fed to a buffer circuit inside IC592 at pin5 and output at pin4 of IC592.
These 2 comparing voltages that are inputted at pin 1 and 13 shall be compared within IC592 as well as
feedback from output voltage of PWM chopper circuit. Output of comparison is the voltage that controls the
duty cycle of square wave that generated from saw-tooth waveform. Square wave is buffered and output at
pin 9 of IC592 to the gate of Q5G1,PWM modulation.
Source voltage (230V) of Q5G1 is converted into horizontal deflection voltage by the duty cycle of the square
wave. This voltage is supplied to a horizontal size modulation circuit consists of Q5A1, R5AC, R5AE, C5A5,
C5A8, and ZD5A1. Transistor Q5A1 modulates chopper DC output voltage from L5G2, C5G3. Self bias voltage
by R5AC and R5AE , and a modulation wave form( E/W parabolic wave form) is applied to a base through C5A6.
A modulation wave form is made in the distortion correction circuit described in below section
Содержание MultiSync FP1370
Страница 13: ...4 4 REMARK SYMBOL Mount the EMF PWB 121E REMARK SYMBOL Clamp the connector ...
Страница 14: ...4 5 REMARK SYMBOL COIL FORMING UPPER SIDE REMARK SYMBOL COIL FORMING LOWER SIDE ...
Страница 23: ...4 14 REMARK SYMBOL REMARK SYMBOL Clamp CN CA CN CC and CN D with CLAMPER WIRE ...
Страница 26: ...4 17 REMARK SYMBOL Clamp the wires SAFETY REMARK SYMBOL Clamp the wires CN ASD CN AF 21 ...
Страница 80: ...5 51 Fig 3 11 CONV PWB Fig 3 12 EMF PWB CN EMF CN LL CN RR CNEM CN CA CN D CN CCB HS8N1 ...
Страница 143: ...8 18 15V 80V AFC D FOCUS Fig 3 1 HIGH VOLTAGE CIRCUIT AND PROTECTOR CIRCUIT ...
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