About This Manual

This manual is specifically written to aid the service technician, repairing CERONIX Models 1493, 1793, 1993, 2093, 2793, and 3693 color monitors. To understand how the Monitor works, it is best to know what each circuit does and how each circuit relates to the other circuits. The Block Diagram is presented in a simplified view and a comprehensive view to accomplish the goal of understanding the whole unit. Once the general picture is clear, the complexity of each circuit will be easier to...

Attach The Grounding Strap First

With the degaussing coil leads centered on the bottom of the CRT, FORM THE COIL to avoid the remote control board. INSTALL A WIRE TIE through INSTALL A WIRE TIE through the top hole in the left CRT ear. the top hole in the right CRT ear. INSTALL WIRE TIES through the bottom hole in the left CRT ear. INSTALL WIRE TIES through the bottom hole, with the grounding strap spring, in the right CRT ear. Degaussing Coil & Grounding Strap Attachment Specification. For The Model 1793, 1993, 2093 Video...

Crt Auto Bias Vertical Sync

The vertical oscillator one shot (LA7851 pin 16) supplies the start timing for the auto bias vertical sync. This signal is conducted to the emitter of 379 by jumper 089 . The base of 379 is connected to the retrace boost pulse by resistor divider 3831 and 384 . Combining these signals in this way produces a collector waveform which has the vertical oscillator one shot timing and is dependent on the retrace boost pulse. For the 15KHz case, transistor 100 inverts the vertical oscillator one shot...

Dynamic Focus Circuit Function And Circuit Description

The dual focus CRTs require a waveform on the 2 focus grid. This voltage waveform is dependent on the position of the beam on the CRT. The lowest voltage part of the waveform is in the center of the screen and the highest voltage part of the waveform is at the corners of the screen. The dual focus CRTs require a waveform on the 2 focus grid. This voltage waveform is dependent on the position of the beam on the CRT. The lowest voltage part of the waveform is in the center of the screen and the...

Equipment setup for trouble shooting the Iso Xfr75W Iso Xfr100W Isolation Transformers

SAFETY FIRST Use only one hand when working on a powered up ISO XFR-75W, ISO XFR-100W to avoid electrical shock. Always wear safety glasses when working on powered up electronic equipment. Note When using this isolation supply for working on monitors, it is important to have some resistance (10MQ or less) to ground. An insulated monitor connected to a insulated power supply may attain a high static voltage. When this voltage discharges through the ISO XFR-75W, ISO XFR-100W control circuit, the...

Isolation Transformers

The ISO XFR-75W -100W MUST be grounded by mounting on a grounded, conductive surface via at least two screws. WARNING Mains power and ground connections must be made before power is applied to the ISO XFR-75W or the ISO XFR-100W Isolation Transformers. WARNING FOR CONTINUED SAFETY, REPLACE SAFETY CRITICAL COMPONENTS ONLY WITH MANUFACTURER'S RECOMMENDED PARTS (REFER TO SERVICE LITERATURE). AVIS POUR MAINTENIR LE DEGRE DE SECURITE DE L'APPAREIL NE REMPLACER LES COMPOSANTS DONT LE FONCTIONNEMENT...

Power Supply Test

To verify that the power supply is working correctly, connect the 17V line, as indicated in section 2 on this page. Also connect the oscilloscope GND to V- and the oscilloscope probe to the FET drive (anode of diode 116 ). There should be a waveform at this point. If there is no FET drive waveform, check the voltages and waveforms on the C5184 pins and compare them to the voltages and waveforms on the schematic. Connect the AC power cord with the AC voltage, from the variable transformer turned...

Vorrichtungen haben zum Lsen von Problemen mit dem 75W und dem 100W Isolierung Transformatoren benutzt

SICHERHEIT ZUERST Um elektrischen Shock zu vermeiden, benutzen Sie nur eine Hand beim Arbeiten auf einem angeschaltenen Transformator 75W oder 100W. Tragen Sie immer Sicherheitsgl ser beim Arbeiten auf angeschaltener elektronischer Ausr stung. Anmerkung Beim Benutzen dieser Isolierung Versorgung von Monitoren dem Bearbeiten zu, ist es wichtig, irgendeinen Widerstand zu haben, (10 Meg.Q oder kleiner) zu erden. Ein Isoliermonitor, der an eine Isolierenergie kann angleschlossen wird eine hohe...

Wire Routing Instructions

Attach the protective earth, Fold remote cable to clear green yellow, ground wire. CRT and add wire tie. Rout G2 wire around CRT socket, shorten with loop, and add wire tie. Plug in video board. Fold video flat cable to avoid contacting the metal frame. Secure fold with a wire tie. Shorten focus wire and add wire tie. Finished assembly with the different voltage type wires not touching each other. Make solder connection CA when using these C PRAs for replacement parts on the XX92 product line....

Circuit Function Description

The basic function of the ISO XFR-75W and ISO XFR-100W is to isolate the line power for monitors requiring an isolation transformer. The transformer is designed to have a low leakage flux value which allows it to be mounted close to the CRT. To accomplish the low leakage flux, the transformer has two sets of primary and secondary coils mounted on a modified toroid type core. The ideal transformer would be a toroid but this type transformer is expensive because it is difficult to wind. A relay...

Ceronix Model 1793 Replacement

The CRT Auto Bias IC is a combination of digital and analog circuitry. The digital part is a counter and control logic which steps the analog circuits through a sequence of sample and hold conditions. The analog part uses a transconductance amplifier to control the voltage on a 10uF capacitor (one per gun). This voltage is buffered and sent to the video amplifiers as the bias voltage. In monitors without CRT auto bias, this voltage is adjusted manually using a setup procedure to set the color...

Horizontal Raster Width Control Circuit Description

The purpose of the horizontal width control is to 1. Provide a convenient means for adjusting the horizontal raster size. 2. Correct pincushion distortion in the vertical axis. 3. Correct horizontal raster distortion caused by periods of high beam current. The horizontal width control circuit is comprised of two main parts The control circuit and the diode modulator (DM). The control circuit combines four signals in the monitor to produce the width control circuit. These signals are 1....

High Pot Tester

The MONITOR is connected to the enclosure ground via the signal cable, monitor support hardware, and the protective earth ground wire. The chassis ground must be connected to earth ground. All the large accessible metal parts are connected to ground. Highpot, F r Schock Gefahren, StromkreisBeschreibung. F r die Modelle 1493,1793,1993,2093,2793, und 3693 videomonitoren. Es ist die Verantwortung der Firma, die den Ceronix Monitor in dort system benutzt, sich zu vergewissern, da kein Schock...

Simplified Power Supply Circuit Description

The FET drive circuit avoids this problem by sensing flyback diode conduction. If the flyback diode conduction is sensed, the low current start mode is selected. This mode turns the FET on, to a current of .1A, for not more than 4uS. If before or during the low current FET on time, the flyback diode breaks free, and the FET drain voltage goes down, the flyback diode voltage comparator will signal the regulator to permit the FET to be turned on for a full power cycle. The cycle after the last...

Ceronix 2793 Service Manual

SAFETY FIRST Use only one hand when working on a powered up monitor to avoid electrical shock. Many of the failures that cause burnt components and boards are eliminated by the load sensitive switching mode power supply in the CERONIX monitor. This feature can cause problems with servicing the monitor if the proper trouble shooting approach is not used. The equipment setup, shown here, is necessary for efficient trouble shooting of the CERONIX monitors....

Video Amplifier Circuit Description

The video amplifier's output voltage, with no input signal, is the black level which is the picture tube cut off voltage. This voltage is set, for each of the three video amplifiers, by the auto bias circuit via the bias control line. This black level voltage has a range of 80V to 110V. The voltage swing at the output is 60 volts for a 10 mA current signal from the C5346. For this same 10 mA current signal, the voltage swing at the video amplifier input is 1.5 volts and the input voltage swing...

5

A helpful hint when working with color problems is by identifying the color of the three grid lines at the top of the screen. When there is a missing color and the lines are white the problem lies in the video interface section. This means it can be found between the customers game and pin 8 of the Video Amplifier K-Film . If the lines are not white it would be a output problem, which is anything after pin 8 to the picture tube. If the problem is excessive blue, green, or red background color,...

2pl Cpm2013

Plugs in main board left side of flyback transformer. Degaussing Coil amp Grounding Strap Attachment Specification. For The Model 2793 and 3693 Video Monitor. 1. The first item to attach to the picture tube is the grounding strap. Lay the tube face down on a soft surface. Slide the folded over end of the braid over the left top CRT mounting ear. Attach the spring at the other end to the, right side top, slot in the rimband. Pull the bare wire through the bottom slot in the...

Installation Instructions For The XX93 Monitors

A 3 amp slow blow fuse for the degaussing current and a 75 VA isolation transformer are the minimum requirements for using our monitor in a product. 3. Install the monitor in the enclosure. Refer to the installation instructions supplied by the system manufacturer for details of mounting the monitor in the enclosure. 4. Connect the green yellow ground wire to the earth ground connection on the enclosure. This wire is connected to the ground screw, located on the monitor chassis behind the...

Table Of Contents

Block Diagram Crt Monitor

Video Amplifier Circuit, Function, Video Amplifier Circuit Description and Video Board Power Supply and Arc Protect CRT Auto Bias and Auto Bright Circuit, Function, CRT Auto Bias, Auto Bright, and Vertical Sync Delay Circuit Description 72 CRT Auto Bias and Auto Bright Monitor, Block Diagram Blanking, Master Gain, and Fault Circuit, Function, Blanking, Master Gain, and Fault Circuit Blanking, Master Gain, Beam Limiter, and Fault Vertical and Horizontal Sync Circuit Vertical Deflection Circuit...

2 Year Limited Warranty

This product is warranted by CERONIX to be free of defects in material and workmanship for a period of two years from the date of purchase. All parts and labor are free of charge during the warranty period. This warranty does not cover mechanical breakage due to physical abuse. It is the customer's responsibility for shipping the defective unit to and from CERONIX or one of the authorized service centers for repair. Please attach a note describing the problem. CERONIX Inc. 13350 New Airport...