Teac A-450 - PLAYBACK PERFORMANCE

7-1. PLAYBACK PERFORMANCE
NOTE
Except
for
the
Playback
Frequency
Response
checks,
all
alignments
in
the
PLAYBACK
PERFORMANCE
only
have
to
be
done
with
the
EQ
switch
set
to
position
3
unless
there
is
a
special
reason
which
requires
that
other
positions
also
be
checked.
7-1-1. RECORD/PLAYBACK HEAD AZIMUTH
1.
Gp
ADJUSTMENTS
Load and play a TEAC MTT-150 test tape.
Make sure the phase relationship between the 2 signals
(left
channel
and
right
channel)
is
within
45°
on
the
oscilloscope.
Load a TEAC MTT-116U test tape.
Play the 10 kHz signal section of the tape.
Slowly
adjust
the
azimuth
adjusting
nut
for
the
maximum indication on the VTVM.
Secure the nut with a drop of locking paint.
0° 45° 90° 180°
’
'
c
{
’
IN PHASE OUT OF PHASE
Fig. 7-1 Confirming Phase Relationship
Adjusting Nut
R/P Head
Fig.
7-2
Head
Azimuth
Adjustments
Location
7-1-2. SPECIFIED OUTPUT LEVEL SETTING
1.
2.
3.
4.
5
Load and play a TEAC MTT-150 test tape.
Adjust VR102/202 for 100 mV (—18 dB) on VTVM
connected to the CAL test points.
Change the VITVM connection to the OUTPUT jacks.
Set the OUTPUT controls fully clockwise.
Confirm that the output level is —3.5 dB + 1 dB (461
mV ~ 580 mV).
Set
the
OUTPUT
controls
for
a
reading
of
—5
dB
(435
mV).
This
is
the
specified
output
level.
At
this
time,
the
physical
position
of
the
OUTPUT
controls
indi-
cates
the
Specified
Control
Settings
referred
to
in
subsequent
procedures.
IMPORTANT
After this setting is done, do not disturb the Specified
Control Setting of the OUTPUT controls until the remain-
ing checks and adjustments are completed.
CONNECTION
OSCILLOSCOPE
under TEST
T- 389-2
Fig. 7-3 Connection
SWITCH & CONTROL SETTING:
T-469
OUTPUT Control: Proper setting
CONNECTION
(A)
E Wei Pe ine Edis Piao tid
DOLBY B-TYPE PROCESSOR PC BD.
DECK under TEST
U
OSCILLOSCOPE
(B)
Fig. 7-4 Connections
SWITCH & CONTROL SETTING: Same as 7-1-1.
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17