GAI-Tronics 272-001 Manuel d'instruction - Page 8
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Model 262-001 and 272-001 Intrinsically-Safe Telephones
Maintenance
This section includes two troubleshooting charts designed to quickly pinpoint the source of problems.
Troubleshooting
N
: It may be advantageous to temporarily connect a Model 262-001 or 272-001 Telephone panel
OTE
directly to the output terminals of the Model 263 IBU when troubleshooting. Then, using the charts
below, the cause of the problem should more easily be determined.
Non-Equipment Related Problems
Problem
The I.S. phone is inactive with
no lights on the IBU when the
phone is off-hook.
The I.S. phone has no dial tone.
The lights on the IBU flash
randomly.
d:\standard ioms - current release\42004 instr. manuals\42004-173d.doc
03/06
Solution
1. Check the ac power to the Model 263 IBU.
2. Check the ac fuse F4 at the Model 263 IBU.
3. Ensure there is no wiring open at the I.S. phone.
1. If the I.S. phone has a wiring short, the IBU lights will be lit in
the following pattern:
ISLOOP
LOCK
HOOK
TELCO
2. If the TELCO line has an open, the IBU lights will be lit in the
following pattern:
ISLOOP
LOCK
HOOK
TELCO
The I.S. phone has an intermittent wiring short. The short may be
between the conductors or either/both conductor(s) to ground/shield.
=
,
On
= Off
=
,
On
= Off
Pub. 42004-173D
Page: 8 of 14