Genius ISO XFR-100W, ISO XFR-75W, 2093 Monitors with vertical deflection current which exceeds

Page 71

Vertical Booster Amplifier Circuit, Circuit And Function Description.

 

 

 

 

 

 

 

Monitors with vertical deflection current which exceeds

 

LA7838

 

 

 

 

2.2 Ap-p cannot be driven directly by the LA7838 vertical

 

 

Thermal Protection

 

deflection IC.

The vertical booster amplifier circuit

 

 

Vertical

 

 

 

 

 

 

 

 

reduces the output current of the LA7838 by amplifying

 

Deflection Vert.

 

 

 

Retrace

Out

 

 

 

the vertical deflection current.

The LA7838 is mounted

 

 

 

 

 

 

Booster

 

377

Boost

 

on the vertical booster amplifier circuit board to allow the

 

 

 

 

 

boosters circuit to be inserted at the output of the LA7838.

+24V

Drive

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

9

10

11

12

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+24V

 

 

 

 

E

604

605

 

 

 

 

 

611

PCB View;

 

 

 

 

 

 

 

 

 

 

606

607

608

609

610

Foil Side.

 

 

 

 

 

 

 

 

 

 

NPN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TIP31A

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

603

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

602

FR205

 

 

 

NPN

E

 

 

Vertical Amp. PCB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.2Ω

 

 

 

 

 

 

602

C

 

 

 

CPB1615

 

 

 

 

 

 

 

 

 

604

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

44Vp-p

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

605

 

470uF

1N4007

 

 

PNP

E

 

 

612, LA7838

 

 

 

 

 

 

 

 

 

 

601

C

 

 

 

 

 

 

 

 

 

+

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

380

382

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

3

5

7

9

11

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical yoke drive, voltage waveform.

 

 

609

 

TIP31A

 

 

 

Vertical Booster Circuit,

 

 

 

 

 

 

 

 

603

FR205

 

 

 

 

 

4.7Ω

 

Operation.

The following

 

 

 

 

 

 

 

611

 

 

 

3.0Ap-p

 

 

 

608

 

 

 

waveforms are taken from

 

#1

 

 

 

 

#3

 

 

 

 

 

 

 

 

 

 

 

 

the 2793-VGA monitor.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.3Ω

 

 

 

 

 

 

 

 

 

 

 

#2

 

 

 

See waveform #1 for the

 

 

 

 

 

 

 

610

 

 

 

vertical deflection current.

 

Vertical yoke drive, current waveform.

 

 

4.7Ω

 

 

 

 

 

 

 

 

 

 

 

Waveform #2 shows the

 

 

 

 

TIP32A

 

 

 

 

 

 

 

 

 

607

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LA7838 output current.

 

 

 

 

 

 

 

 

601

 

 

 

 

 

0.6Ap-p

 

 

 

 

 

 

 

 

 

Waveform #3 shows the

 

#2

 

 

606

 

#1

 

 

current supplied by the

 

 

 

 

 

 

 

 

 

YC1

 

 

vertical booster amplifier

 

LA7838 output, current waveform.

 

 

 

 

Vertical

 

 

 

circuit. These current

 

 

 

 

 

 

 

 

 

 

waveforms describe how the

 

 

 

 

.68Ω

 

Deflection

 

 

 

vertical booster circuit

 

 

#3

2.4Ap-p

 

 

2,200uF

Yoke

 

 

 

reduces the LA7838 output

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

385

449

 

YC2

 

 

 

current to a current which is

 

 

 

 

 

 

 

 

 

 

well within the specification

Vertical booster, current waveform.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of the IC.

 

 

 

 

 

 

 

 

 

 

 

 

The output of the LA7838 is connected to the yoke by a 3.3Ω

resister at

610 . It also drives the

 

 

bases of transistors 601 and

603

 

through 4.7Ω

 

stabilization resistors. When the voltage drop

 

 

across resistor 610

reaches ±.7V the respective transistor (601 for -.7V & 603 for +.7V) takes

 

 

over most of the additional vertical yoke drive current.

 

 

 

 

 

 

 

 

 

The retrace booster pulse, from the LA7838 pin 9, is connected to the retrace booster capacitor at

 

 

380 and is also buffered by an NPN transistor at

602 The output of the retrace boost is

 

 

connected to the LA7838 at pin 13 and to the vertical booster NPN transistor at

603 .

 

 

Diodes

604

and 611 conduct current, right at the start of retrace. This current is produced by

 

 

the energy in the yoke, from the end of the last trace.

Diode

382

supplies the deflection current

 

 

to both the LA7838 and the booster amplifier circuits during trace time.

 

Stabilization capacitors output transistors.

606

and

609

are not used at present, but may be needed with other

87

Page 70 Page 72
Image 71
Page 70 Page 72
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.
Top Page Image Contents