Specifications

58 Chapter 3
Troubleshooting
Self-Test Diagnostics (Step 1)
Figure 3-7 Reading the Self-Test Diagnostic. The Internal LEDs
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LEDs
1
2
3
1. Remove the Test Set’s external cover.
2. Turn power on.
3. Read the LED sequence (see illustration
on right) and compare with the patterns
below.
NOTE
For multiple failures, the failure
patterns described below will repeat
for all failures detected.
No Failures...
The LEDs will light
for approximately
10 seconds, then all
will turn off.
The first blinks rapidly
and indicates the type of
failure.
The second and third
patterns blink slowly and
indicate failure details.
See the following
tables. (This example
indicates a Serial Bus
Communication
problem.)
(This example indicates a
faulty A2A80 Audio Analyzer
1 assembly.)
LED Sequences
= off
= rapid blink
= steady on or slow blink
LED Legend
321
0
321
0
321
03 2 1
0
Failures... three patterns are displayed: