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7. MAINTENANCE
Aside from replacing failed relays, the DS3 NIU3 12-
Slot Housing does not require maintenance for normal
operation.
ADTRAN does not recommend that repairs be
attempted in the field. Repair services may be obtained
by returning the defective unit to ADTRAN. Refer to
the
Warranty and Customer Service
information.
Signal Relay Replacement
Each loop has a cut-through signal relay accessible on
the backplane. The relay ensures data transfer in the
event the NIU3 module fails, is removed, or loses
power. Failure of the relay is determined by process of
elimination. If a loss of signal occurs, and all other
parameters are satisfactory, then a failed relay is
indicated. A relay replacement kit (P/N 1212072L1) is
available from ADTRAN.
CAUTION
Observe prong configuration on the removed
relay. Relays are polarity sensitive, and
replacement relays must be oriented correctly.
To replace a failed signal relay, perform the following
steps:
1. Insert a jumper strap on the posts immediately
adjacent to the suspect relay. This provides a signal
path, bypassing the relay.
2. Using an appropriately sized IC extractor tool, lift
the relay off its socket.
3. Align and insert the replacement relay, taking care
not to bend prongs, and that relay orientation is the
same as the removed relay.
4. Remove the jumper strap.
5. Monitor for normal operation.
Alarm Relay Replacement
The alarm relay is located adjacent to the alarm wire-
wrap pins on the DS3 NIU3 12-Slot Housing backplane.
The alarm relay output responds to the card malfunction
status on individual NIU3 modules. If an alarm
condition occurs, but an alarm signal is not present, then
a failed alarm relay is indicated.
6
To replace a failed alarm relay, perform the following
steps:
1. Using an appropriately sized IC extractor tool, lift
2. Align and insert the replacement relay, taking care
section for further
8. WARRANTY AND CUSTOMER SERVICE
ADTRAN will replace or repair this product within the
warranty period if it does not meet its published specifi-
cations or fails while in service. Warranty information
can be found at www.adtran.com/warranty.
Refer to the following subsections for sales, support,
CAPS requests, or further information.
ADTRAN Sales
Pricing/Availability:
800-827-0807
ADTRAN Technical Support
Pre-Sales Applications/Post-Sales Technical
Assistance:
800-726-8663
Standard hours: Monday - Friday, 7 a.m. - 7 p.m. CST
Emergency hours: 7 days/week, 24 hours/day
ADTRAN Repair/CAPS
Return for Repair/Upgrade:
(256) 963-8722
Repair and Return Address
Contact Customer and Product Service (CAPS) prior to
returning equipment to ADTRAN.
ADTRAN, Inc.
CAPS Department
901 Explorer Boulevard
Huntsville, Alabama 35806-2807
Issue 6, August 2004
the relay off its socket.
not to bend prongs, and that relay orientation is the
same as the removed relay.
61212078L1-5F
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