Teac A-4070G - Page 25

RECORD HEAD AZIMUTH ADJUSTMENT
Coarse Adjustment
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NOTE
The effect of turning the azimuth screw will not immediately
register on the level meter. A slight delay will be noticed.
Therefore, the screw must be rotated slightly, and then pause
to see the effect. Refer to HEAD ALIGNMENT FOUR WAYS in the
PLAYBACK HEAD AZIMUTH ADJUSTMENT.
Connect a Level Meter to the LINE OUT jacks and an AF oscillator
to the LINE IN jacks.
Place the MONITOR switch to SOURCE and adjust the AF oscillator
to obtain a signal of 15 dB below the specified output level.
(The level meter will indicate -23 dB.)
Make certain that the LINE control is at the specified input
level position, then set the AF oscillator to 10 kHz.
Thread a record test tape on the unit and place the mode L:R
switches up.
Place the MONITOR switch in the TAPE position.
. Adjust the azimuth screw for maximum indication of the level
meter.
Fine Adjustment
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10.
NOTE
It is absolutely essential to accomplish the coarse adjustment
before using this method, to avoid phase error larger than 45?
Connect the test equipment as shown in Fig. 7-8.
Apply a 7.5 kHz signal at -23 dB to the LINE IN jacks and record
this signal.
Carefully adjust the azimuth screw until the oscilloscope shows
the signal to be in phase.
Secure the screw with a drop of LOCTITE.
D-0391
SIGNAL RECORDED TAPE
Fig. 7-8 Fine Adjustment Set-up -Head Azimuth-