Teac AN-80 - Adjustment Procedure

ADJUSTMENT PROCEDURE
Test Equipment Required
AF Oscillator (20 Hz to 50 kHz or more)
AC Voltmeter Input impedance 100k or more
Frequency response 20 Hz to 50 kHz or more
Attenuator
Oscilloscope
"B" Weighting Network or Noise Analyzer
AN-80 Built-in Oscillator Level Adjustment
-
The
purpose
of
this
adjustment
is
to
set
the
output
level
of
the
‘internal
calibration
oscillator
of the
AN-80.
~
Connect
the
AC
voltmeter
between
the
test
point
(TP-1)
terminal
on
the
amplifier
PC
board
of
the
AN-80
and
the
ground
(27).
- Set the L channel MODE switch to REC.
-
While
depressing
the
REC
TONE
switch,
adjust
VR-105
so
the
AC
voltmeter
will
indicate
100
mV.
Level Meter Sensitivity Adjustment
Adjust the sensitivity of the AN-80
level meter using the internal test
oscillator.
- While depressing the REC TONE switch,
adjust VR-106 so the pointer will come
to the position shown.
(Refer to illustration below.)
DOLBY LEVEL METER
Playback Amplifier Input-Output Characteristic Adjustment
- The AN-80 varies the input-output characteristics in accordance
with the level or frequency of the input signal as it produces a
record signal. In the playback mode, the reverse takes place to
restore the signal to its original state.
The procedure for adjusting the playback amplifier follows.
Follow the procedure for L channel first and then for R channel.
~ Connect the test equipment as shown in the diagram.