Playback Performance; Record/Playback Head Azimuth Adjustments; Specified Output Level Setting - Teac A450 Service Manual

7-1. PLAYBACK PERFORMANCE
NOTE
CONNECTION
|
DECK
SETTING:
OUTPUT Control: Proper setting
CONNECTION
r
(A)
(B)
2Z
SWITCH & CONTROL SETTING:
Same as 7-1-1.
17
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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.
4.
5.
1.
2.
□ Side 2
□ Side 1
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 VTVM connection to the OUTPUT jacks.
Set the OUTPUT controls fully clockwise.
Confirm that the output level is -3.5 dB ± 1 dB (4 1
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.
2(R)-'/
> > >
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n
7-1-1. RECORD/PLAYBACK HEAD AZIMUTH
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-1 1 U 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.
45" 90° 180°
7-1-2. SPECIFIED OUTPUT LEVEL SETTING
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W g r
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