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15-3
Diagnostics Theory
AF_DIAGS
AF_DIAGS
Audio Frequency Generators 1 and 2
This test checks the A6 Signaling Source/Analyzer assembly. As a test signal, a digital “1”
exercises DACs on the output of the A6 Signaling Source/Analyzer assembly to verify
voltage range, using the voltmeter at the LFS1_VM and LFS2_VM outputs.
Preliminary Audio Paths
This test checks the A4 Modulation Distribution assembly. The 9 possible paths through
the A4 Modulation Distribution assembly are checked using signals from the A6
Signaling Source/Analyzer assembly, routing the signals to the voltmeter through the A3
Audio Analyzer 1 assembly at AUD1_VM, or the A2 Audio Analyzer 2 assembly at
AUD2_VM, for path 9.
Modulation Distribution Internal Paths
This test checks the A4 Modulation Distribution assembly. Using the two inputs from the
A6 Signaling Source/Analyzer assembly, the same paths as the Preliminary Audio Paths
test are checked again. During the test the gain and attenuation of the paths are varied.
Modulation Distribution External Paths
This test checks the A4 Modulation Distribution assembly. Using the AFG1 output from
the A6 Signaling Source/Analyzer assembly, the external MODULATION IN AM/
SPEECH path through the A4 Modulation Distribution assembly is checked. The AFG1
input is checked first to verify that it can be used as a test signal. An external connection is
used to route the AUDIO OUT connector on the front panel to the MODULATION IN
AM/SPEECH connector. The gain and coupling of the path are varied. The signals are
routed from the MOD_MON output of the A4 Modulation Distribution assembly to the
A3 Audio Analyzer 1 assembly for routing to the voltmeter through the AUD1_VM
output.