Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 83)

Monitoring and Troubleshooting
Verilink Access System 2000: The Basics 5-17
The input DC voltages can be measured at J14 (power supply A) or
J15 (power supply). If the power supply input voltage is correct,
measure the output voltages at the front panel test jacks. The 5V
point should output 5.5 Vdc and the 12 V point should output 12
Vdc.
If the shelf backplane has DC power, replace the associated DC
power supply. Check the power source and ground wiring from
TB1.
AC Power If an AC power supply fails, check the power cord connection to the
AC outlet. If this connection is good, verify that the AC outlet is
providing power. If the power source is good, replace the power
supply.
NOTE: When operating in an AC power environment, give strong
consideration to connecting one power supply to a UPS, and
the other power supply directly to local commercial power.
Figure 5-3 illustrates a basic AS2000 fault isolation tree.