Troubleshooting
Single Link Staff Phone Problems
Summary: Single link staff phones are so named because they all connect through relays to a single line
of the TCIV. Therefore, all are disabled when anyone is in use, giving rise to the following
normal situations which may be considered problems:
As long as any single link staff phone is in use:
No other single link staff phone can be used.
Picking up a single link staff phone will not make a speaker call private.
A call-in exists which cannot be cleared.
Unclearable Call-in
Step 1. Place the single link staff phone on-hook using one of the following methods:
Go to the remote location.
Dial ## followed by the architectural number of the remote location and request
that someone place the phone on hook. (## keeps the call from reverting to the
phone before communication can take place.)
Step 2.
Step 3.
If Step 1 did not clear the call-in, ground was not removed from the T call-in
terminal
of the
speaker: Check the wiring for a short to ground or other problem.
Check the DIP switch setting of the Speaker Control Boards serving the problem speaker and
single link staff
phone, the
rightmost switch
lever
should be positioned as follows:
Down Single Link Staff Phone
Other Problems
Step 1. Verify the A: attribute of the single link staff phone is A:12 (A:7 is
off).
Step 2. Verify Location Code 64008 contains the physical number of the LLM (TC4150) line shared
by single link staff phones.
Step 3. Verify Pin 3 is cut on the line hybrid
(Ul)
for the LLM line serving single link staff phones.
Step 4. Verify the T and R terminals of the single link LLM line are properly connected to the Speaker
Control Board (SCC25) S1 and S2 terminals (refer to Drawings KM0674 and KMO686).
Speaker Intercom Problems
Using the #99 function, ensure ail A: attributes for the VCM are off. If B: attributes are on,
access to the VCM speakers is restricted via the special page algorithm (refer to the Special
Page Line Type Selection Chart in the Programming Section).
Page 28 of 30 1989 Rauland-Borg Corporation (Orig. Rev. l/89)
