Instruction manual

Troubleshooting and Repair
025-9416 123
TROUBLESHOOTING AND REPAIR
TROUBLESHOOTING THE PAGING PROCESS
This section provides troubleshooting charts to help solve some of the problems that can occur
with the paging terminal or any of the peripheral equipment connected to it. Many times the
paging terminal is operating properly, but as a result of some programming or configuration
error, it appears to malfunction. The troubleshooting charts include descriptions of symptoms,
causes, and remedies.
The paging process is broken down into three basic parts for troubleshooting simplicity:
paging input
page processing within the Model 640
paging transmission output
The second step of the page processing — the things that are controlled by the Model 640’s hard-
ware and software — are transparent to the system operator and the paging subscribers. The
result is that troubleshooting falls into only two categories - pages that are not successfully input
to the paging terminal and pages that are not successfully transmitted. In many situations, the
common problems that arise are a result of faulty communications between the paging terminal
and the input and output equipment it is interfaced to.
Paging Input
The first step in the paging process is the input to the paging terminal. This can consist of tele-
phone calls into the paging terminal, local alphanumeric paging input, or any network link input.
Problems in getting a page into the paging terminal can involve the telco connections and set-
tings, the serial input connections or the Line Type Database parameters.
Use Table 17 to help isolate and correct problems that may appear with the paging terminal.
The italicized words in the table are used to guide the system operator to the specific sight or
sound that defines the problem. They allow a quick scan of the table for the appropriate entry.
Table 17. Troubleshooting Paging Input to the Model 640
Symptom Possible Problems Solutions
Trunk won’t answer an end-to-
end line type and:
LINE LED doesn’t light
Matrix plug incorrectly set Verify matrix position.
Telco problems Verify phone lines wired at
punchdown block.