E

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...

20

6,800pF-15KHz 3,300pF-31KHz 3,300pF-38KHz 6,800pF-15KHz 3,300pF-31KHz 3,300pF-38KHz The voltage on capacitor 346 controls the horizontal oscillator frequency via I 18 I. 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...

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...