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HORIZONTAL DEFLECTION CIRCUIT DESCRIPTION.
3,300pF-38KHz
12
2.7K
1uF
+
-.2VDC
1.5Vpp 04,E6
Hs
7.3-8.7V
4Vpp 02,D6
Hs
7.3-8.7V
4Vpp 03,D6
Vs 3-4VDC
1.4Vpp 05,E6
Hs 2.4-3.4VDC
06,E6
0Vpp
1 64 52 3
GND
1
18
10K
1uF
+
45K
8.8K22K
12K
0Ω
202
I2
I3
I12
I7
344
347
I6
GND
6,10
9
25K
I5
350
351
2
7
8
6.8K
I13
BIAS
MULTIPLIER
Horizontal
SYNC INPUT
POSITION
O/S
SYNC O/S SAW TOOTH
GENERATORTR.
PICTURE
DELAYED
I4
1N4007
333
11
330pF
NEG.
Hs
17
I PRA
416
484
20K
Horizontal
Position
RC7
comp.
+
-
11
5.4-6VDC
11, E5
348
12-18VDC
33Vpp 27,E7
Hs
200Ω 2W
337
340
GND
342
1N4007
2SC4159E
2.2K.5W
341
+24V
338
100uF
+
220uF
334
RC4
Horizontal
Sync
7.3VDC
5.5Vpp 01,D6
Hs
1,000pF-15KHz
330pF-31KHz
330pF-38KHz
+12V Supply
0VDC
56Vpp 62,D6
Hs
+24V to 27V Supply
Remote
Control
PCB
6,800pF-15KHz
3,300pF-31KHz
3.92K
418
3.92K
417
352
56pF
I1
1.8K
3
The picture position O/S clamps timing capacitor
351 to 8.2 volts until horizontal sync triggers this O/S.
The voltage on the timing capacitor drops at a rate set
by the horizontal position control 484 and resistor
I 4 . When the voltage, at pin 2, drops below 4 volts
the delayed sync O/S is triggered and capacitor 351 is
reset to its clamped voltage. The delayed sync O/S
functions the same as the picture position O/S with the
exception that it is not adjustable.
During the active part of the delayed sync pulse,
the multiplier gates current to capacitor 346 which
is dependent on the sawtooth voltage at the
delayed sync pulse time. Capacitor
347 sets the
"0" voltage for the multiplier which is the average
value of the sawtooth waveform.
The flyback pulse, connected to pin 4 through
resistor
I6 , starts the negative slope of the saw
tooth generator. When the sawtooth wave, which is
produced by a current to capacitor 348 , drops to 3
volts, the sawtooth generator switches back to the
positive slope part of the wave till the next FBP.
All of these functions except for the picture
position adjustment are accomplished by the
phase locked loop. Delaying the horizontal
sync with an adjustable timer produces the
picture position adjustment.
The functions of the horizontal control circuits are:
1. To provide the horizontal output circuit
with a stable frequency with or without
incoming horizontal sync.
2. To be able to adjust the picture position,
horizontally, with respect to the raster.
3. To operate stability through periods of
missing horizontal sync pulses.
4. To keep the picture from drifting within
the operating temperature range.
The horizontal sync input circuit (pin 1) will
trigger the picture position one-shot (O/S) on
either the rising edge, or the falling edge, of the
horizontal sync pulse. To accomplish the edge
triggering, the sync pulse is differentiated by
capacitor
352 into two short pulses, one for the
rising edge and one for the falling edge of the
sync pulse. Which edge is the trigger depends
on the bias voltage at pin 1. For positive edge
triggering, the bias voltage is set to 7.8 volts by
resistors
I2 and I3 . For negative edge
triggering, the bias voltage is set to 4.1V by
connecting
I 12 via the solder connection IA .
If the delayed sync pulse occurs when the
sawtooth is at a low voltage part of its cycle,
capacitor
346 discharges and the oscillator
frequency lowers. If the delayed sync pulse occurs
at the top part of the sawtooth wave no current
flows to capacitor 346 . This action, phase locks
the horizontal oscillator to the incoming sync
pulses.
I12
352
I2 I3
348
346
I6
351
484
I4
346
347
351
346
IA
IA
82