TC Communications TC1920, User Manual

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Chapter 5 Troubleshooting Electrical
5-5 TC1920 Rev 1.3 User Manual
5.4 Electrical
Often the quickest way to troubleshoot is to replace components and check
the results. Use known good components for the replacement, and keep
track of which original components belong to a specific rack and their
settings. Individual settings may prevent or interfere with operations in
another TC1920 unit.
5.4.1 Using Front Panel Indicator LEDs For Diagnostics
Unit LEDs include:
• Power Source A and B (PWR) on page 5-6
• Power On (Vcc) on page 5-6
• Alarm on page 5-7
• Link on page 5-7
• BP1 and BP2 on page 5-7
• Compression Ratio (CP-R) on page 5-8
• Volume TX and RX on page 5-8
• FXS on page 5-8
• Master/Slave on page 5-9
• Telephone/Analog Panel Ports on page 5-9
5.4.1.1 Power-up LED Verification Sequence
The LEDs, except PWR A, PWR B, and Vcc, will flash for 3 seconds during
power up. If an LED does not flash, it has most likely failed.
NOTE
There is the possibility that the LED itself has failed and is not
showing the current condition. Call TC Communications
customer service for assistance if you suspect this to be the
case.