Specifications

78 Chapter 3
Troubleshooting
Manual Troubleshooting Procedures (Step 4)
Verify Test Set’s Reference Path
Out-of-Lock (OOL) LEDs
Out-of-lock (OOL) LEDs light when a phase-locked loop inside an
assembly is failing. The Signal Generator Synthesizer, A2A25, and the
Receiver Synthesizer, A2A22, assemblies have these LEDs mounted
close to the top of the modules. The location of each LED is labeled on
the assembly.
Verify that the CDMA Generator Reference (A2A100) and the
Reference (A2A23) are working before troubleshooting the Receiver
Synthesizer (A2A22) and/or the Signal Generator Synthesizer (A2A25)
assemblies.
Figure 3-16
CDMA Generator Reference (A2A100) Verification
• Verify that a 1, 2, 5, or 10 MHz signal of >0.15 Vrms is being applied
to the EXT REF IN connector.
• Verify that the 10 MHz REF OUT connector, outputs a 10 MHz
signal of >0.5 Vrms.
SIG GEN SYNTH A2A25
REFERENCE A2A23
RCVR SYNTH A2A22
J3
J75
J78
J76
Out-of-Lock LEDs
OOLs.eps