User's Manual

User Handbook L-RU Revision C
CONFIDENTIAL
PROPRIETARY
Reg. No.: User Handbook 1100182-C.DOC Page 25 of 29
7.4 Troubleshooting
You have obtained a state-of-the-art product, which is reliable and operationally safe.
Nevertheless, problems or malfunctions may occur. Following we will present strategies
how to eliminate possible problems.
The safety instructions must be observed (see notes below the table)!
Pease follow the procedures for the troubleshooting in the prescribed order.
Checklist RU
Symptoms Reason Procedure
• All RU LED are off.
The power supply is inac-
tive.
1. Check the AC voltage
2. Check the connectors of AC cable
3. Check the AC power cable for
damages
The outputs of the PSU
have over or under volt-
age
Reset the RU by switching Off and
after a few seconds On of the AC
power
• RU PSU LED is
red.
PSU is defect
Please contact RFS customer ser-
vice for repair or replacement of RU
• RU Monitoring
LED is red.
Problem with optical sig-
nal
Please check the system trouble-
shooting list (see next page).
Note: Always remove AC power cable before checking or changing fuses.
115 / 230 VAC can be lethal.
Note: To avoid shock, injury or damage to the RU: use only fuses with
the amperage, interrupt, voltage and speed ratings specified.
Note: Don’t open housing of RU. Warranty exclusion in case housing has
been opened!