Second: Determine Whether The Trouble Is Constant Or; Intermittent; Third: Describe The Trouble; Procedure - AT&T Merlin 820 Service And Maintenance Manual

How to Use This Manual
trouble is not found when you have completed these tests, go to "HOW TO SELECT
THE CORRECT PROCEDURE" section in this manual to continue your attempt to
find the cause of the trouble.
SECOND: Determine Whether the Trouble Is Constant or Inter-
mittent
If the cause of the trouble was not found by performing the basic trouble tests, you
should find out whether it is always present or whether it is intermittent. For
example, if there is noise on an outside call, place the outside call again to see if the
noise is still present.
If the trouble comes and goes, you have an intermittent problem. Locating the
cause of intermittent trouble is hard because it may not last long enough for you to
complete the trouble isolation procedures. If the trouble keeps coming and going,
call your equipment supplier for help.

THIRD: Describe the Trouble

If the problem is not intermittent but persists, describe it on paper. Include the fol-
lowing information:
The intercom number(s) of the voice terminal(s) on which the trouble appears
(the intercom numbers range from 10 to 29).
The telephone number(s) of the line button(s) on which the trouble appears, or
the label of the feature button which seems to be causing the trouble. For exam-
ple, if the trouble appears while you are trying to make an intercom or outside
call, write "intercom" or the number of the outside line button from which you
are calling.
The kind of trouble. For example, write down "noise on the line," "light does not
come on by the INTERCOM button," "cannot interrupt dial tone," or "HOLD
button does not work."
FOURTH: Select the Correct Trouble Isolation Procedure
After describing the trouble on paper, follow the steps in the section labeled "HOW
TO SELECT THE CORRECT PROCEDURE." This explains which procedure to fol-
low for finding faulty components such as voice terminals, cartridges, modular
cords, or adapters.
FIFTH: Perform the Trouble Isolation Procedure Selected
When you have determined which trouble isolation procedure to use (either Trouble
on One Voice Terminal, Trouble on More than One Voice Terminal, or Trouble on an
Accessory), perform that procedure to locate the faulty component. If you are
unable to locate the faulty component, call your equipment supplier for help.
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