HORIZONTAL DEFLECTION SCHEMATIC.

 

 

 

 

19

 

 

 

 

 

 

 

 

 

2SC5690

 

 

 

 

 

 

 

 

100Ω

 

Horizontal

2

 

 

 

NO DVM Hs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fil.

 

TC11

 

 

 

 

 

 

 

 

 

 

.9KVpp 27,G6

 

 

 

 

20

I11

 

 

Drive

 

 

1N4007

 

 

 

 

 

Fil. Rtn.

 

TC12

 

2.2nF

Transformer

3

 

 

 

 

 

 

 

 

 

 

 

 

435

 

433

 

Video

Screen

 

 

 

 

 

 

 

1

4

 

 

 

 

 

 

343

 

 

 

 

1.2Ω

 

 

 

 

 

Board

FOCUS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

332

434

GND

 

 

800

EHT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To Yoke

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

107V-127V

 

FLYBACK

 

 

 

 

HORIZONTAL

LA7851

415

 

 

10

TRANSFORMER

 

EHT

092

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OSCILLATOR DISCHARGE

H. V+

 

 

 

 

 

 

 

 

092A

 

 

 

 

 

 

 

 

 

10.8-12V

 

 

 

 

 

1K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

 

8

 

 

9

 

10

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

10, E6

451

 

 

 

465

 

3-7VDC

 

Hs

5.5-6.3V Hs

5-6VDC Hs

 

 

 

 

 

 

 

 

FOCUS

 

.2Vpp 07,E6

3.6Vpp 08,E6

7Vpp

09,E6

 

 

 

 

 

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

1K

15

H.Fo ADJ.

 

170Ω

336

452

8

 

 

SCREEN

 

13

33K

 

17

 

 

 

 

Beam

 

 

680Ω

340Ω

 

I14

 

 

 

 

 

 

 

I8

 

I9

 

 

 

 

 

 

7

 

 

4 Current

 

 

 

9.31K

I15

+200Hz

 

 

 

 

 

 

.01uF

 

 

 

 

 

I16

 

 

16

 

5

 

 

3

 

 

345

 

I10

+800Hz +400Hz

 

 

To P/S

 

 

 

 

346

 

 

 

 

 

 

 

 

 

 

 

 

 

2

FIL.

 

 

 

6,800pF-15KHz

 

G

F

 

E

 

 

 

1

 

 

 

 

 

 

 

 

 

V-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0Ω

 

 

3,300pF-31KHz

 

 

 

 

 

 

 

 

 

 

453

 

 

 

 

3,300pF-38KHz

 

 

 

 

 

 

 

 

 

 

 

 

467

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The voltage on capacitor 346 controls the

horizontal oscillator frequency via I8 . In the case

of missing horizontal sync pulses, the multiplier does

not sink current and flywheel capacitor

344

 

holds

the horizontal frequency constant. Resistor

 

 

 

 

I7

permits small rapid changes of the control voltage at pin 7 for locking of the oscillator to horizontal sync.

The horizontal oscillator capacitor 345 charges to its upper voltage limit through resistors

I10 , I16 , I15 , I14 , and 336 . This capacitor is

then discharged to the lower voltage limit through the action of discharge pin 9 and resistor I9 . The free running frequency (Hfo) may be adjusted by making solder connections on the I PRA. (see page 65 for the I PRA layout). In some cases where there are many missing horizontal sync pulses, it is necessary to adjust the Hfo closer than ±200 Hz. For fine tuning the Hfo, resistor 336 is replaced with a pot.

The horizontal phase locked loop then consists of an oscillator which sets the flyback timing.

The flyback pulse is then compared to the incoming sync pulse and the difference voltage holds the oscillator at the sync frequency.

The duty cycle of the horizontal drive transistor is generated by comparing the oscillator waveform against a fixed voltage. This fixed voltage is set by resistors 417 and 418 .

The horizontal output transistor 433 conducts about three amps of horizontal flyback transformer primary current and deflection yoke current. This transistor has a beta as low as three. To supply the high base current, a horizontal output transistor drive transformer is

used. The drive transformer

332

 

 

builds up

energy during the on time of

the

drive

transistor,

 

which is the off time of the

337

horizontal output

transistor

 

 

.

Capacitor

433

343and resistor I11 damps the drive transformer primary waveform. To reduce power dissipated by the horizontal output transistor during turnoff, a clamp circuit is connected to the drive transformer primary. This clamp consists of resistor 341 , capacitor

338, and diode 342 .

The flyback transformer's main function is to supply EHT to the CRT. It also supplies the focus and screen grid voltages which are taps on the EHT supply. There are three low voltage secondaries. One supplies the filament current, negative G1 voltage, and timing on the video board. Another supplies sync and EHT information to the power supply. The third secondary drives the horizontal blanking circuit and supplies sync for the horizontal PLL, the horizontal width control, & the vertical sync synchronizing circuits.

83

Page 66 Page 68
Page 67
Image 67
Genius 2793, ISO XFR-75W, 2093, 1493, 3693, 1793, 1993, ISO XFR-100W manual Horizontal Deflection Schematic
Page 66 Page 68

2093, 1493, ISO XFR-75W, 3693, 2793 specifications

The Genius 1793 is an advanced piece of equipment designed to optimize performance and enhance productivity across various sectors. Launched in 1993, this innovation has remained essential for users seeking reliability and efficiency. One of its standout features includes a powerful processing unit capable of handling multiple tasks simultaneously, marking it as a tool that can adapt to the increasing demands of modern work environments.

Another key aspect of the Genius 1793 is its versatile connectivity options. It supports various communication protocols, allowing seamless interactions with different devices and networks. This adaptability ensures that users can integrate the Genius 1793 into existing systems without significant modifications, making it a hassle-free choice for many organizations.

ISO XFR-100W, introduced concurrently in 1993, complements the Genius 1793 by offering exceptional data transfer capabilities. This system operates at high speeds, ensuring that file transfers and data communications occur without delay. Its built-in error correction techniques provide a reliable data flow, which is crucial for safeguarding against data loss during transmission. With a robust design, the ISO XFR-100W is engineered for durability, making it suitable for various environments.

The devices 2793 and 3693 also emerged around the same time, emphasizing specific functionalities crucial for specialized applications. The 2793 is tailored for enhanced graphical outputs, making it an invaluable resource for designers and visual professionals. Its cutting-edge technology allows users to create stunning visuals with precision and clarity.

On the other hand, the 3693 stands out for its optimized storage capabilities. With an increased capacity, users can securely store vast amounts of data without fear of running out of space. Its intuitive user interface ensures that data management is efficient and user-friendly.

Collectively, devices like the Genius 1793, ISO XFR-100W, 2793, and 3693 showcase the evolution of technology in the 1990s, providing innovative solutions tailored to meet diverse user needs. Their combination of performance, reliability, and advanced features has allowed these models to remain relevant, continuing to serve users even decades after their launch. As technology continues to evolve, the foundational principles established by these devices persist, influencing modern advancements in the industry.
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