Teac A-3340S - Page 22

ADJUSTMENT SEQUENCE
PLAYBACK HEAD AZIMUTH ADJUSTMENT
11.MEASUREMENT AND ADJUSTMENT
-ELECTRICAL-
PLAYBACK PERFORMANCE ©
PLAYBACK HEAD SPECIFIED ae | ea METER ee
AZIMUTH ADJ ae | SETTING ea ee
MONITOR PERFORMANCE |
eae es METER MINIMUM Peed PHONE
INPUT eae LEVEL es LEVEL Peed OUTPUT CHECK
BIAS RECORD HEAD RECORD
ADJ AZIMUTH ADJ LEVEL SET
RECORD PERFORMANCE
BIAS TRAP
ADJ
LEVEL ERASE SIGNAL-TO= OVERALL
VARIATION EFFICIENCY NOLSE RATIO FREQUENCY RESPONSE
NOTE: After head replacement or if, during playback,
a slight pressure on the heads results in a rise of
the reading of the Test Set (M-826A), head azimuth.
should be readjusted.
Coarse Adjustment:
Connect a Test Set to either OUTPUT jack.
Thread a TEAC Test Tape YTT-1003 on the unit.
Play the 15 kHz Test Tone in Section 2 of the Test Tape.
Slowly rotate the azimuth screw until maximum indication
is obtained on the Test Set. Then decrease reading 0.5 dB
by rotating screw clockwise.
Fine Adjustment:
NOTE: It is absolutely essential to accomplish the coarse
adjustment before performing the fine adjustment to avoid
phase errors larger than 45? After coarse adjustment, do
not make large corrections, turn azimuth screw 1/4 turn or
less,
Connect the test eqipment as shown in Fig. 11-1.
Play a 50 HzV10 kHz signal and adjust the azimuth screw
until the oscilloscope shows that the signals are less
than 45° out of phase.
Secure the screw with a drop of LOCTITE.
—20—-