8-13
(Fig. 2.9) HORIZONTAL SIZE CONTROL CIRCUIT
①
Horizontal size modulation circuit
The transistor Q5A1modulates the Chopper output voltage that location is C5G3. This transistor is biased
by R5AC and R5AE and the modulation wave is added to the base through C5A6. The modulation wave
is made by Horizontal size correction circuit which is described section 2).
②
User H SIZE control
OSM control for users vary from 0 to 255. At this time, the voltage of IC532 pin 5 (HS control line) vary
from 5V to 0.9V.
The horizontal video size reduces as much as approximately 78% irrespective of the horizontal frequency
when the maximum size is taken to 100%.
③
H SIZE MAX control
The H SIZE MAX control is accessible in service mode only, and this control sets the maximum horizontal size.
The H SIZE for user control vary from the horizontal maximum size which is adjusted at this stage to less than
the H SIZE MAX. H SIZE MAX control vary from 0 to 255 on OSM menu, and the voltage of IC532 pin 6
output voltage vary from approximately 0.9V to 5V. The horizontal maximum size control voltage (HSM)is
output to IC591 pin 10 and is compared to the HS voltage (IC591 pin 9) . The HSM output voltage is
converted to slice voltage at the comparator for PWM control which is input to error amplifier IC592 pin 1.
Ref.
Voltage
H_Drive
Pulse
6
8
3
2
9
+
+
5
4
13
1
IC591
IC592
(H)
+B
(V)
(V)
(H)
FB
AFC_Feedback
H.Def Out
220V
(H)
H.Out Trans
+B Modulator
Q5A1
PWM Chopper
Q5G1
Amplifier
IC5GA
H.SIZE MAX
H.SIZE
E/W from IC501
SAW GEN
PWM Amp
Bufferr Amp
Error Amp
C598
R59J
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 ...
Страница 260: ...10 1 ...
Страница 261: ...10 2 ...
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