Display Troubleshooting
The Display system consists of four sections:
Input Section
Analog-Digital Converter and
Track and Hold
Processor Section
Memory,
Data Manipulator,
Main Control,
and
Interface
CRT Driver Section
Trigger,
Intensity Control, and
Line
Generator.
CRT Amplifier Section
High Voltage Regulator and either
XYZ Driver
Amplifier (Serial Prefixes 3004A and above) or
Z Axis
Amplifier
X Deflection Amplifier and
Y Deflection
Amplifier
Isolation of a malfunction to one of the above sections is done with the use of rear-panel
display outputs and the internal test programs.
If the left INSTR CHECK LED is on, a failure has probably occurred in Digital Storage.
Refer to the A3 Digital Storage Troubleshooting notes for the correct troubleshooting
procedure.
The following paragraphs briefly describe the failure modes and appropriate places to begin
the troubleshooting.
Characters Only
If only the characters on the CRT display are affected, the problem most likely exists on the
Memory.
Graticule and Characters Only
If the graticule and characters are incorrect, but the video information appears to be correct,
suspect the System ROMs on
first. Also the “long POP” test of the RF Section
memory should be performed. Refer to the Digital Storage Troubleshooting notes for more
information.
Al 1
Содержание 85662A
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Страница 294: ...2 k 4 5 7 J2 F1 TEN R91 12VTV R14 LG 20 A4A2 Log Amplifier Detector Component Locations 85662 60132 ...
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Страница 452: ...A4A6A2 Output Driver Component Locations 85662 60170 Option 067 Tab ...
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Страница 594: ...HEWLETT PACKARD HP Part No 85662 90085 Printed in USA ...