Genius 1493, ISO XFR-75W, 2093, 2793, 3693, 1793, 1993 Switch Mode Power Supply Circuit Description

Page 74

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH MODE POWER SUPPLY CIRCUIT DESCRIPTION.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Oscillator waveform without sync:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Oscillator waveform with sync:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Error Amp. V.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FET drive,

 

C5184 pin 10:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fet Drive

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

With Sync

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The series regulator IC

 

, controls

 

sense the max. current. Resistors

 

 

 

 

 

,

 

 

 

 

 

 

 

 

 

 

 

115

 

 

 

140

 

133

 

 

 

 

current to the monitor GND

by

pulse width

 

and capacitor

 

 

 

 

 

reduce power

supply

 

 

 

 

 

 

 

 

 

 

 

 

138

 

 

 

 

 

 

 

 

 

 

 

 

 

modulation.

A PNP transistor

 

, has an

 

electrical noise.

 

 

 

 

 

Transistor

 

 

 

 

 

 

 

 

and diode

 

 

 

 

112

 

 

 

 

 

 

127

 

 

 

 

emitter current, that is directly

proportional to

 

 

short the FET drive to

V-

when the

 

 

 

 

 

 

 

 

 

 

116

 

 

 

 

 

 

 

 

 

the 127V line voltage due to resistor

 

 

 

 

 

and

 

monitor is turned off to protect the FET

 

from

 

J1

 

 

adjustment resistors

 

 

 

 

&

 

 

 

 

. This

 

conducting current with a still large drain

 

 

 

 

J13

 

J14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

current is transmitted to the power supply V-

 

voltage. Resistors

 

 

 

,

 

 

 

 

 

 

,

 

 

 

 

 

 

 

 

 

 

and

 

 

 

 

 

 

 

 

 

J10

J11

 

J12

 

134

line, and is applied to a resistor

 

 

 

 

 

 

 

,

 

 

 

, &

 

 

 

provide a means for

checking flyback diode

 

 

 

 

 

 

J5

 

J15

 

 

 

 

 

 

 

 

. The voltage across these resistors is

 

 

 

 

 

 

 

 

conduction via a comparator.

 

 

If the

 

 

 

 

 

 

 

 

 

 

J16

 

142

 

 

 

 

 

 

 

 

 

 

 

compared to a reference voltage by the error

 

comparator measures low flyback diode voltage

amplifier.

If the +127V line goes up the output

 

the FET is turned on to the .3A low current

 

 

 

 

of the error amplifier voltage goes up.

 

mode. This mode is necessary for power up,

The pulse width modulation, which controls the

 

since initially the +127V line is 0V and no

 

 

 

 

+ 127V line voltage, is accomplished by turning

 

reverse diode voltage exists. The over voltage

the FET drive on at some particular voltage

 

protect circuit, at pin 14, has a trip voltage of

along the rising slope of the oscillator waveform.

 

8V and when it is activated, it shuts down the

This particular voltage is the error amplifier

 

power supply.

 

The EHT is measured by

 

 

 

 

 

 

 

 

 

output voltage. See waveforms above.

 

rectifying the

flyback pulse, with diode

 

 

 

 

 

 

 

,

 

 

 

 

130

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

from a secondary winding of the FBT.

 

 

 

 

 

 

 

 

 

 

 

The FET drive is always off during the

 

Capacitors

 

 

 

 

,

 

 

 

 

 

 

 

 

and resistors

 

 

 

 

 

,

 

 

 

 

 

 

 

 

125

124

 

 

 

126

 

 

J9

 

 

negative slope of the oscillator, or just after the

 

are connected as a low pass filter to smooth out

sync pulse.

 

Since the FET drive pulse is started

 

the simulated EHT voltage which is then

 

 

 

 

 

 

 

 

 

by the error amplifier voltage and terminated by

 

applied to the C5184 at pin 14.

Resistor

 

 

 

 

 

 

 

 

 

 

J8

 

 

the end of the oscillator cycle, a control system

 

protects the IC current sense input from

 

 

 

 

 

 

 

 

 

via pulse width modulation has been established.

 

voltage spikes and resistor

 

 

 

 

 

 

protects the

 

113

 

The oscillator waveform is produced by charging

 

PNP transistor from momentary

 

overvoltage

capacitor

 

 

 

 

with a constant current set by

 

damage due to line spikes. Zener

diode

 

 

 

 

 

 

 

 

 

102

 

 

 

181

 

 

resistor

 

J7

 

 

 

to a voltage of 5V

 

and then

 

protects the horizontal and video circuits

from

 

 

discharging

the capacitor with double the

 

overvoltage due to power supply failure. If the

charging current to 2.5V.

 

Adding the flyback

 

+127V line exceeds 160V, the zener diode

 

 

 

 

 

 

 

 

 

181

 

 

pulse, via capacitor

 

123

 

to this waveform

 

shorts to GND the +127V line.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

synchronizes the oscillator, since the oscillator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

frequency is set below the horizontal frequency.

 

At the input to the power supply is a

 

 

 

 

 

 

 

 

 

 

Resistors

 

J2

 

,

 

J4

 

and capacitor

108

limit the

voltage doubler which outputs between 240 to

error amplifier's AC gain, to hold the control loop

425VDC depending on the AC line voltage. It

stable.

Capacitor

107

 

holds the error amplifier

has a three amp fuse

 

 

to protect the PCB

 

146

 

stable.

Capacitor

 

 

 

reduces power supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

limiter

 

 

 

 

 

 

to

 

 

 

 

 

 

 

 

 

 

110

 

traces, an inrush current

 

159

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

noise, but, if too large, will cause the power

protect the rectifier diodes

 

 

 

&

 

 

 

.

 

 

 

 

 

 

 

 

 

 

148

 

156

 

 

 

 

 

 

 

 

 

 

supply to be unstable.

 

The 127V line is adjusted

Capacitors

 

 

 

 

and

 

 

 

are used to reduce

 

 

 

 

 

 

150

155

 

 

 

 

 

by making solder connections on the J PRA (refer

diode noise from the monitor to the AC input.

to page 65 for the layout).

 

Solder connections

JC

 

 

For 220VAC operation the voltage doubler is

and

 

are used to raise the 127V line up to 4.5

replaced by a full wave rectifier by adding

 

 

 

 

JD

 

 

 

 

volts

in

steps of 1.5 volts.

 

Connections

JA

and

JB

diodes

 

 

,

 

 

 

, capacitors

 

,

 

 

 

and

 

 

 

 

 

151

154

152

 

153

 

 

 

 

 

lower the 127V line as much as 4.5V.

 

 

 

 

 

 

 

 

removing the jumper at

 

.

 

 

 

 

 

 

 

 

&

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

152

 

 

 

 

 

144

 

 

163

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

are the raw DC filter capacitors.

 

 

 

 

Resistor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

supplies the power supply start current and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

resistors

 

 

and

 

 

 

balances the series

 

The FET

 

 

 

 

works together with the

143A

143B

 

 

 

 

 

 

connected filter capacitors

for 220VAC

 

 

 

 

 

 

 

 

 

 

 

 

136

 

 

 

 

 

 

 

 

 

 

transformer

 

 

 

 

to provide a low resistance

operation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

166

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

current path

from

V- to GND. This low

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

resistance coupled with no large voltage times

Caution! When working on a monitor with a

 

 

 

 

current products is what makes the power

 

 

 

 

supply efficient.

Resistor

 

 

 

 

provides a

degaussing relay,

 

468

unplug the degaussing coil

 

137

 

 

 

 

 

 

 

 

 

means for sensing the FET current. In the low

to avoid causing the residual current relay to

current mode, it is used to set the 300mA current

close on a cold posistor.

This can happen if the

and in the full on mode it is used to

24V line is energized by a external power supply.

90

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Page 73 Page 75
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.
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