Genius ISO XFR-100W, ISO XFR-75W, 2093, 1493, 2793, 3693, 1793, 1993 manual Missing, Color, Retrace lines

Trouble Shooting Handbook

The information that is written in this handbook is to help repair XX93 Monitors.

Here is a guideline in which this handbook will follow:

1.Color problems.

2.No video with power.

3.No V-H sync.

4.Retrace lines.

5.No power.

Color Problems.

Always wear safety glasses.

Caution; Use only one hand when working on a powered up monitor to avoid electrical shock.

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, tap on related K-film to see if it is defective.

If blue is the problem, check for damaged traces around the outside of the video board, since most of these traces go to the blue K-film.

If monitor shuts down due to excessive color, disconnect the filament for voltage tests. (Desolder CRT socket pin 9.)

Note: All voltage measurements are: DC with -lead to GND unless other wise noted.

Problem

Tests

Probable Solution

Missing

1.

Check voltage on 75Ω

input

If 0V to .05V, check video

resistors

,

, &

.

connector and drive electronics.

288

286

284

Color.

2.

If voltage, IC

pins 16, 13, or 9

Check for open between IC and

241

Refer to the

less than 7V & K-Films pin 1>8V.

associated K-Film.

schematic for

the specific pin

3.

If voltage, K-Film pin 1 is 10V and

Ohm gain resistors at pins, if OK

numbers of

IC 241 Pins 1,15, & 8 are .3 to.7V.

replace video interface IC

.

241

each color.

4.

If voltage, K-Film pin 1 over 10.6V

If pin 1 over 10.6V, replace K-Film.

Pins, listed in

Desolder pin 1. Make open to trace.

If pin 1 is 10V, replace the diode of

Color may be tested by connecting a clip

missing color

,

, &

.

213

086

084

table, are in

lead to GND and a 1.62KΩ

resistor.

order of Red,

If still missing color, replace IC

241

.

Contact the resistor to K-Film pin 1.

Green,

and Blue.

5.

If voltage, K-Film pin 20, different

Resistance between these two

than voltage at CRT socket pin.

points should not exceed 1.1KΩ .

Tests should

6.

If voltage, K-Film pin 20 is

First replace, for shorted arc

preformed in order

over 115V.

suppression, diodes of affected color.

to reduce chance of

Arc

Red

Then try replacing the K-Film.

835

899

replacing wrong

suppression

Green

845

849

If not solution, change the

component.

diodes:

Blue

transistors in the amplifier.

886

959

95