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Width and Horizontal Center Adjustments
Horizontal centering control R3425 and width LX3261
are to be adjusted under low light conditions (see Fig-
ure 4-2).
1.
Turn the G2 control clockwise until a raster ap-
pears .
2.
. Adjust these two controls so that the raster is
1/4 inch from the left and 3/8 inch from the right
CRT edges.
3.
Turn the G2 control counterclockwise until the
raster just disappears.
Focus
With a video source connected to the monitor, adjust
the focus control for the clearest (sharpest) display
(see Figures 1-2 and 4-2).
Fill the Screen Test
A Z-100 Series, Z-100 PC Series, or equivalent com-
puter is required for these tests.
The screen can be filled by using the Monitor ROM.
1.
Turn on the computer.
2.
Z-100:
Z-100 PC:
Page 4-6
When the hand prompt appears
(you may have to defeat the au-
toboot by pressing the ESC key
during the autoboot sequence to
get this), press the T key to·ob":.
tain the test menu from the Moni-
tor ROM. If the test menu does
not appear and the computer
beeps, then the Monitor ROM is
an early version and does not
contain the test routines. In this
situation, use the BASIC pro-
gram.
Press the CTRL, ALT, and INS
keys and then enter TEST and
press RETURN.
3.
Select the Keyboard Test by pressing the 2 key.
4.
Choose any character to fill the screen by
pressing it. The capital Z is recommended.
5.
Check to see if the screen is filled with the test
character and if the width and height of the dis-
play are correct.
6.
Make any necessary adjustments (see Monitor
Alignments and Adjustments in this chapter).
7.
When you are finished using the display, press
the DELETE key to return to the test menu.
8.
Press the 5 key to return to the hand prompt.
Cleaning Procedure
WARNING: Be sure that the monitor's power cable
is unplugged before cleaning.
•
•
•
Clean the cabinet with a lint-free cloth, lightly
dampened and with a mild cleaning solution;
do not spray liquids directly on the monitor or
use a wet, saturated cloth.
Clean the monitor's screen with a good quality
glass cleaner.
Be sure that the monitor is completely dry be-
fore applying electrical power.
Servicing Diagrams
Use the following block diagrams to locate schematics
while tracing Signal and power circuits during trouble-
shooting.
Waveform representations are provided with adjacent
schematic and component location drawings. The
source location of waveforms are shown on both
schematic and component location drawing.
A Z-160 PC Series computer was used to supply the
composite Signals for generating the waveforms.
NOTE: Some input and output waveforms for some
boards are taken from the adjacent boards because
test points having the same Signal are more accessible
there.
Servicing
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Table of Contents
Troubleshooting
