Teac A-6010GSL - Record Head Azimuth Adjustment

RECORD HEAD AZIMUTH ADJUSTMENT
Coarse Adjustment
NOTE: The effect of turning the azimuth screw will not
immediately register on the level meter. A slight delay
will be noticed. Therefore, rotate the screw slightly,
and then pause to see the effect on the level meter.
1. Connect a Level Meter to the LINE OUT jacks and an AF oscillator
to the LINE IN jacks.
2. 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.)
3. Make certain that the LINE control is at the specified input
level position, then set the AF oscillator to 10 kHz.
4. Thread a record test tape and place the unit in the record mode.
5. Change the MONITOR switch in the TAPE position.
6. Adjust the azimuth screw for maximum indication of the test set
’ level meter.
Fine Adjustment
NOTE: It is absolutely essential to accomplish the coarse
adjustment before using this method, to avoid phase error
larger than 45°.
7. Connect the test equipment as shown in figure below.
8. Apply a 7.5 kHz signal at -23 dB to the LINE IN jacks and record
this signal.
9. While recording carefully adjust the azimuth screw until the
oscilloscope shows the signals to be in phase.
10. Secure the screw with a drop of LOCTITE.
BIAS CURRENT (mA)
Fig. 7-8 Fine Adj. Set-up
Fig. 7-9 Bias Current Characteristic
7-s