Tools Required - HP 9000 Series 500 Handbook

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_ 98760 Adjustments .
Tools Required
Part
No.
Description
09020-10010
System Integrity Test (SIT) Discs
HP 3476 (or equivalent) Digital Multimeter
Photodyne 19XE Radiometer
8710-1388
CRT Alignment Tool (or non conducting screwdriver)
8710-0900 #2 Pozidrive Screwdriver
Adjustments Summary
Adjustments to the 98760 consist of a color intensity alignment procedure, which is part of the
System Integrity Test (SIT), and the horizontal and vertical centering adjustments that center the
display raster on the CRT. The clamp and gain pots for each CRT gun (red, green, and blue) are
located on the video drive board. The horizontal and vertical centering adjustments are located on
the sweep board.
Note
The RFI Cage Door does not have to be opened to access the pots on
the video drive board.
Adjustments
WARNING
OBSERVE ALL WARNINGS AND SAFETY PROCEDURES IN THE
SERVICE MANUAL. LETHAL VOLTAGES ARE PRESENT INSIDE
THE COMPUTER.
Internal Intensity (Color Alignment)
1. Load the SIT TEST system boot discs.
2. Load the SIT Mainframe Test Programs disc.
3. Type:
LOAD "TEST: INTERNAL"
t1 (
EXECUTE)
4. Follow instructions on the display and select AGRAPHICS when the test menu is presented.
5. Select the INTERACTIVE test under AGRAPHICS and step through the procedures as
directed. The video board contains all clamp pots, gain pots, and test points. The sweep
board contains the screen grid adjustment and several other adjustments.