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4.7
Reed pack replacement
If after performing troubleshooting or verification, a reed
switch is thought to be faulty, it should be replaced. Note that
reeds can only be replaced as a pack of three. The part num-
ber for a reed pack is RL-179. A reed pack maintenance kit,
part number 9174-MK is also suggested.
Cross point relay
Use the following procedure and Figure 4-8 to replace cross
point relay reed packs.
NOTE
Repairs should only be done from the
component side of the board.
1. Remove the card and place on an anti-static surface.
2. Put on the gloves that came in the maintenance kit.
3. Carefully pry off the cover of the guard enclosure of the
crossbar that includes the suspect reed. Take care not to
break the wire that connects the cover to the front panel.
4. Carefully pry off the cross point interconnect board.
Take care not to break the wires that connect the inter-
connect board to the front panel.
5. Using clean needle-noise pliers, carefully remove the
reed pack in question.
6. Inspect the relay coil. If there is any debris or
contamination, clean with methanol and blow out with
dry nitrogen.
NOTE
When inserting reed pack, make sure long
leads are inserted into relay coil (bobbin).
7. Using the reed pack insertion tool from the maintenance
kit, install the new reed pack into bobbin making sure
the long leads align with the holes at the base of the relay
coil (bobbin).
8. Reinstall any reed packs that may have been removed
when the cross point interconnect board was removed.
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9. Reinstall the cross point interconnect board. Be sure that
it is properly seated.
10. Reinstall the guard enclosure cover.
11. Allow the card to stabilize for one hour.
12. Retest the card to verify operation and specifications.
Isolator relay
Use the following procedure and Figure 4-9 to replace isola-
tor relay reed packs.
NOTE
Repairs should only be done from the
component side of the board.
1. Remove the card and place on an anti-static surface.
2. Put on the gloves that came in the maintenance kit.
3. Carefully pry off the cover of the guard enclosure. Take
care not to break wires connecting the relay to the path-
way interconnect board.
4. Using clean needle nose pliers, carefully disconnect the
three wires that attach to the reed pack, taking note of
the locations for each.
5. Remove the reed pack in question.
6. Inspect the reed pack socket. If there is any debris or
contamination, clean with methanol and blow out with
dry nitrogen.
NOTE
When inserting reed pack, make sure long
leads are inserted into relay coil (bobbin).
7. Using the reed pack insertion tool from the maintenance
kit, install the new reed pack into bobbin making sure
the long leads align with the holes at the base of the relay
coil (bobbin).
8. Reconnect the wires to the top of the reed pack.
9. Reinstall the guard enclosure cover.
10. Allow the card to stabilize for one hour.
11. Retest the card to verify operations and specifications.
Service Information
4-11
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