Genius ISO XFR-100W, ISO XFR-75W, 2093, 1493 Vertical Deflection CIRCUIT, FUNCTION, Description

Page 63

VERTICAL DEFLECTION CIRCUIT, FUNCTION, DESCRIPTION.

The LA7851 IC is used for the vertical oscillator. The LA7838 is a vertical deflection control and high efficiency vertical yoke driver IC. Together they form a compact and efficient vertical deflection system.

Vertical Sync

 

SIMPLIFIED VERTICAL DEFLECTION CIRCUIT

+23V to +27V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical Oscillator

2

One

 

Current

 

Retrace

9

 

 

 

 

 

Booster

 

 

 

 

LA7851

 

Shot

*

Source

 

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

5V Clamp

 

 

Drive

Output

 

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical

Linearity

 

 

 

+6V

 

 

LA7838

 

 

 

Fine Tuning

 

 

 

 

 

 

 

 

 

Yolk

 

 

 

4

6

7

 

 

 

 

 

 

 

 

 

 

 

 

 

6V

Ramp Control Circuit

 

 

 

 

Voltage Feedback

 

 

 

 

 

 

 

 

 

 

Vertical

 

 

 

1uF

 

393

390

 

+

 

 

 

 

 

 

 

 

 

449

Size

 

 

 

 

392

 

 

 

375

 

 

401

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

403

 

388

 

 

 

 

 

 

 

 

 

 

 

391

Current Feedback

385

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clamp Enable Pulse *

Voltage on 401

Yoke Current

Yoke Drive

The vertical oscillator in the LA7851 supplies timing to the vertical deflection IC to maintain a raster with no sync present. Vertical sync supplies the timing when sync is present.

The one shot in the LA7838 clamps the ramp forming capacitor 401 to 5V during the first half of vertical retrace.

The ramp forming capacitor is supplied with current by a current source at pin 6. The current source has a fixed 6 volt input voltage at pin 4. A linear ramp is generated if a fixed resistor is connected from pin 4 to GND. Feedback from the yoke current, via resistor

403, is used to modify the linear ramp which helps correct for nonlinearity introduced by the voltage feedback circuit connected to pin 7. The vertical size control is connected to the current source input since adjusting the slope of the ramp adjusts the vertical size. This ramp with the clamp, as the discharge, produces a sawtooth waveform which is connected to the + input of the vertical control differential amplifier at pin 6.

The combination, voltage and current, feedback circuit senses the parabolic waveform on the yoke coupling capacitor

449and is connected to the yoke current sense resistor 385 . This circuit is then connected to the other input of the differential amplifier at pin 7. A capacitor

391smoothes the parabolic waveform and a voltage divider is used to set the output bias voltage. The time constant, of the capacitor 391 and resistor 392 , is set to produce good vertical linearity. An additional linearity correction circuit is added to fine tune vertical linearity. This circuit can be set to add or subtract deflection from the upper and lower portions of the raster.

The differential amplifier controls the power output stage which drives the vertical deflection yoke. The retrace booster is turned on when the ramp voltage is set to the clamp voltage and is reset when the yoke feedback voltage balances the ramp voltage.

79

Image 63
Contents N U a L R V I C E Year Limited Warranty About this Manual Table of Contents Iii Monitor Simplified Block Diagram Installation Instructions For The XX93 Monitors Instructions d´installation des écrans Installationsanweisungen für die XX93 Monitore Ceronix XX93 Monitor Electrical Specification High input voltage 20V Low input voltage 30V 80V Ceronix 189 in2 1,224 cm2 Page Page Page Page Control Description Circuit XX93 Monitor Block Diagram CRT C D E F G H I J Ceronix Model 1493-VGA, 1493-SVGA CPT1536 Ceronix KLM RED FIL RAY Note Produktsicherheit Anmerkung Ceronix XX93 Monitor Part List MM7 LL6 II7 FF9 FF3 BB6 DD8 DD9 HH2 Jumper, Normal Vertical OO6 15KHz, FBT Hitachi BW02651 PP4 RR0 VV2 RR7 CRT T U Video Interface CIRCUIT, FUNCTION, Description + & Analog CRT TC12 Controls XRC5346A + H. Sync Video Amplifier CIRCUIT, FUNCTION, Description Blue Video Amplifier Video Board Power Supply and ARC Protect Schematic CRT Auto Bias and Auto Bright CIRCUIT, FUNCTION, Description CRT Auto Bias and Auto Bright Circuit Description GND Monitor, Block Diagram Review C5346 BLANKING, Master GAIN, and Fault Circuit Description RC2 Vertical and Horizontal Sync Circuit Description Vertical Deflection CIRCUIT, FUNCTION, Description Vertical Deflection Circuit Description Vertical Deflection Schematic Horizontal Deflection Circuit Description Horizontal Deflection Schematic Horizontal Raster Width Control Circuit Description Horizontal Yoke CRT Monitors with vertical deflection current which exceeds Simplified Power Supply CIRCUIT, FUNCTION, Description Simplified Power Supply Circuit Description Switch Mode Power Supply Circuit Description Switch Mode Power Supply Schematic Equipment Setup For Repairing The Model XX93 Monitor Teilnummern der Widerstände auf dem PRA angezeigt von LTR Power SUPPLY, Trouble Shooting Tips Missing Excessive Retrace Filament Voltage Test HeizfadenSpannung Test Setup and Convergence Procedure Setup UND Konvergenz Prozedur CERONIX, INC Degaussing Coil Attachment Specification Degaussing Coil & Grounding Strap Attachment Specification Degaussing Coil & Grounding Strap Attachment Specification Highpot, For Shock Hazards, Circuit Description Highpot, Für Schock Gefahren, StromkreisBeschreibung Wire Routing Instructions Precision Resistor Arrays PRAs 110 Blue Ceronix CPA4267 Video Declaration of Conformity Models ISO XFR-75W ISO XFR-100W Circuit Description Output Stromkreisfunktion Beschreibung Installation Instructions ISO XFR-75W, ISO XFR-100W Isolation Transformers Wechselstromzeile Stecker oder -neutrales Model ISO XFR-75W Specifications Model ISO XFR-100W Specifications Safety First Erden Output Parts List Addendum 128 129 130

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.