Instruction manual

Troubleshooting and Repair
124 025-9416
Symptom Possible Problems Solutions
LINE LED lights
Incorrect Model 640
database parameters
Verify Telephone Line database
settings.
DID line doesn’t receive feed
digits from the CO and:
LINE LED lights, silence on
phone
Matrix plug incorrectly set Verify matrix position.
Incorrect database
parameters
Verify Telephone Line database
settings are DID wink start.
CO sending MF, not DTMF Change CO service to DTMF or
pulse. (or)
Order MF decoder option
LINE LED blinks, busy on
phone
TIP and RING leads reversed Reverse the TIP and RING
connections.
Caller hears a whooping sound
when calling a DID line.
Receiving invalid feed digits
from the CO
Verify the Telephone Line
databases for the correct
ValidNumber settings.
The Model 640 does not detect
star (*) override function during
voice prompts.
Telephone transmits timed
DTMF
Verify that the telephone sends
DTMF tones for the duration keys
are held.
Hybrids (BAL R and BAL C)
not balanced
Readjust the trunk hybrids (BAL R
and BAL C).
Feed digit decoding is
intermittent or inconsistent.
The trunk card levels are out
of balance.
Readjust the trunk hybrids (BAL R
and BAL C). The levels should be
reset regularly (every 2-4 months).
Caller hears busy tones before
the end of paging.
FROM TEL level is too low Readjust the FROM TEL levels per
Section 6.
Model 640 accepts the pager #
or a call from a DID line. Caller
hears a busy signal during or
following a display message
entry.
Terminal was expecting a
Function Code
Overdial digits not being
passed by the CO from a
pulse phone
Listen to phone line to verify DTMF
or dial clicks.
Order dial click decoder option. (or)
Readjust the dial click card per
Section 6.
Paging Output
The final step in the paging process is the output from the paging terminal. This may include
communication with RF link transmitters, colocated transmitters, TNPP output links, etc. Prob-
lems in getting a page sent can involve the radio station connections, settings, and level adjust-
ments, the serial output connections, or the Transmitter Database parameters.
The paging output troubleshooting is split into three categories - general problems, display
paging problems, and voice paging problems. Use Table 18 to help isolate and correct general
problems that may appear with output from the paging terminal.