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1. IF INSTR CHECK LED I remains on and no test pattern can be obtained, the following
assemblies should be checked in the order shown.
Al5 Controller
2. If INSTR CHECK LED I remains on but the test pattern is correct, check the following
assemblies in the order shown.
Al5 Controller
3. If INSTR CHECK LED I is off but the test pattern is incorrect, first check the A3A3 Line
Generator and A3A2 Intensity Control before checking the entire Digital Storage Processor.
4. If INSTR CHECK LED I is off and the test pattern is correct, but the CRT and characters
come up incorrectly after a normal Instrument Preset, check the System ROMs first. A
"long POP" check of the Al5 Controller in the RF Section should also be performed.
CRT Display Test Programs
For all tests, unless otherwise specified: Test Point A3A6TP3 must be
Note
I
test are connected, momentarily push switch A3A7Sl to initialize.
The left INSTRUMENT CHECK LED should
are enabled and instrument preset is pushed.
Test Pattern
Generates a test pattern with graticule, a diagonal line, characters, and three vertical lines
representing the ADC converter outputs of the negative peak, sample, and positive peak
detectors.
The IOB Interface circuitry and the System ROM are not used in generating the Test Pattern.
Free Run Check
disables feedback from the program ROM to the Branch
Length Adder.
disables qualifier feedback.
on when the test ROMS
remain
A3 3
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