HP 8924E, Сборка

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Chapter 2, Troubleshooting
More About Step 1- Run the Power-Up Diagnostic
N:\mkt\MANUALS\HP8924C\ALR\trouble.fb
Timeouts
Certain failures may cause a frequency or voltage reading to timeout, that is, the
time required for the measurement will be unreasonably long. If a timeout occurs,
measurement execution will stop and an error message will be displayed.
• If frequency or voltage readings have been successfully made before the timeout, the
assembly currently being tested or a multiplexer on the A37 Measurement assembly
may be at fault.
• If most measurements fail, the A27 Reference assembly may be faulty in supplying
clock signals to the A37 Measurement assembly.
• Re-run the test to see if the timeout is intermittent.
The Four Functional Diagnostics
The Functional Diagnostics are contained in four independent program files.
Before ordering a replacement assembly based on the diagnostics, you should
read the descriptions of the diagnostic tests.
See chapter 14, "Diagnostics
Descriptions"
. See also
chapter 11, "Block Diagrams"
.
Audio Diagnostics (AFDIAGS3)
This program tests the audio functions of the following assemblies:
• A36 Audio Analyzer 2
• A35 Audio Analyzer 1
• A34 Modulation Distribution
• A15 Signalling Source/Analyzer (AF Generators 1 and 2 only)
• A37 Measurement (only a few selected inputs)
After initial cabling, all tests can be run in a loop mode without further
intervention. This makes it easier to catch intermittent failures.
NOTE: The measurement limits of the Functional Diagnostic tests are valid only at room temperature;
that is, 20 to 25
°
C or 65 to 75
°
F.
When a test fails, a diagnosis is given in three parts:
• A diagnostic code.
• The name of the assembly or assemblies most likely to have failed.
• A rating (high, medium, or low) of the confidence of the diagnosis.
Before ordering an assembly based on the diagnosis, you should read the
description of the diagnostic test and details of the diagnosis based on the
diagnostic code.
See chapter 14, "Diagnostics Descriptions"
. See also
chapter 11,
"Block Diagrams"
.