6.2 OUTPUT RELATED TROUBLESHOOTING SYMPTOMS
Symptom
Output failures
Possible Solution(s)
-
Earphone Cord, Earphone, Patch
Cord/Jack Panel
-
If applicable,
Amplifier,
Output Routing, Amp
Enable/Disable, L/R Switch, Amp
Latch/Control Circuit.
GENERAL APPROACH
TO
FAULT ISOLATION
If the loss of output is isolated to only one of
the
then
earphones
try
exchanging
the earphone assemblies.
Plug
the
left
earphone into the right earphone jack and the right earphone into
the
left earphone jack.
If the problem shifts to
the
earphone,
then the problem is internal to the Audiometer.
opposite
If the
problem
remains
with the original earphone, then
the
assembly
is at fault.
earphone
If the earphone assembly is found to be
defective,
first check the set screws and assure that
they
are
tightened securely.
If the screws are loose a problem similar to
this
would result.
If the screws are secure try exchanging
the
left and right earphone cords, assure that the earphone
serial
numbers are legible,
if not mark the earphones accordingly.
The
earphones
are
calibrated
specifically to the
left
and right
amplifiers.
If the problem shifts to the opposite earphone
then
the phone
cord is defective.
If the problem
remains
with
original earphone then the earphone is defective.
CIRCUIT ANALYSIS FAULT ISOLATION
Refer to Audiometer Board Schematic
#3,
Section 8.
AT-I-EN UATOR
the
Figure 6-2:
BLOCK DIAGRAM OF AMPLIFIER SIGNAL FLOW
48
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