6-10
AlphaServer 8200/8400 Operations Manual
6.5 Troubleshooting a Fu Plug-In Unit
You can perform several checks if you suspect a problem with a Fu plug-
in unit. If the 48V LED indicates a power problem, refer to Figure 6-9. If the
MOD OK LED indicates a problem, see Figure 6-10. If you are unable to correct
the problem, call your DIGITAL customer service engineer.
Figure 6-9 FBUS+ PIU Troubleshooting – 48V LED Off
Front
BXB-0654-95
MOD OK
OC
OT
OV
48V
RESET
V-OUT
DISABLE
ENABLE
MOD OK
OC
OT
OV
48V
PIU 48V LEDs
On
No
Check connectors on the regulators.
Check 48 VDC power where PIU connects.
Check AC and DC power supply.
B
A
