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B
Q Insulator washer
SS, P|
Neo
SECTION
4
ADJUSTMENTS
Frequency Response Adjustment:
Be sure
to perform the following adjustment
when
replacing the microphone.
(This adjustment is performed to flatten the frequen-
cy response
by correcting
the
125Hz
and
16kHz
level difference relative to 4kHz.)
Connection Diagram:
low frequency oscillator
more than
1001 /6.3V
MIC jack
MIC amp output
test pin
Procedure:
The set may be in any state.
1)
Apply
a 4Hz
signal to the MIC jack from the
oscillator, and adjust input level so that output is
—10dBs.
2)
Set frequency to 16kHz, and adjust RV201
to
correct MIC data value only.
3)
Set frequency to 4kHz and adjust input so that
output is —10dBs.
4)
Set frequency to 125Hz, and adjust RV202
to
correct MIC data value only.
MIC data is as follows.
oe
ee eee
'
'
'
+10dB
OdB
+5dB
The level difference
relative to 4kHz
for each
frequency is to be corrected.
In
this
example,
125Hz
is corrected
+10dB
relative to 4kHz.
16kHz
is corrected
+5dB
relative
to
4kHz.
(When
the adjustment
is not
exact
with
the
adjustment resistors, get it as close as possible.)
frequency response adjustment
test pin
SEQ-555ES
SEQ-555ES
RV201
RV202
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