Telenetics Sunrise Series Modular Nest - Manual (Page 30)

Part No. TEL–09949, Rev A
June 2001
Removing and Installing a Backplane in Modular Nest 9 or 21 Enclosure Page 30 of 34
Installing or Replacing a 326X Backplane
Caution
Power down the unit before you begin.
To install or replace a backplane in a Modular Nest 9 or 21 enclosure (Figure 14):
1) Ensure the enclosure is powered down.
2) Using the alignment guides on the backplane and enclosure to line up
the backplane between the screw holes on the top and bottom of the
enclosure, first insert the bottom of the backplane (A), and then rotate
the top of the backplane into position (B). Do not to bend any pins on
the connector.
3) Push down slightly on the base of the backplane (C), ensuring that the
backplane connectors are aligned.
4) Using a flat-blade screwdriver, secure the backplane to the enclosure
with the fasteners supplied. Fasten the base first, then the top.
5) Remove all cards and power supplies from the front of the enclosure.
6) Set an Ohm-meter a minimum 20
Ω range. Measure the resistance
between the following pairs of J2 test-connector pins:
• If all readings register as open circuits, the backplane connectors are not
short-circuited. Go on to the next step.
• If any reading registers resistance, the backplane connectors are short-
circuited. Remove the backplane (using the procedure above), and
carefully straighten any bent or broken pins. Reinsert the backplane
(using this procedure).
If you cannot resolve a problem, call the Telenetics Customer Support
Center.
7)Re-install the cards and power supplies that were removed when you
removed the backplane.
8)Power up the enclosure.
Pin Description Pin Description
1 Digital ground 4 +5V
1 Digital ground 5 +12V
1 Digital ground 6 -12V
4 +5V to 5 + +12V
4 +5V 6 -12V
5 +12V 6 -12V