Teac A-650 - Playback Performance Verification; DC Voltage Adjustments (+13 V, +24 V); Record;Playback Head Azimuth Adjustment

DC VOLTAGE ADJUSTMENT
Muting PC Board
o.
2.
3.
o
16P Connector
5.
Fig. 6-2
DC Voltage Adjustment
6-2. PLAYBACK PERFORMANCE
Preparations:
AMP
SPKR
VtR
Fig. 6-3 Connection
Switch Setting:
DOLBY NR
EQ
LIMITER
BIAS
OUT OUT
3
6.
Adjusting Nut
180°
Spring
OUT OF PHASE
IN PHASE
R/P Head
Fig. 6-5 Confirming Phase Relationship
Fig. 6-4 Head Azimuth Adjustments Location
21
b.
4.
3.
4.
5.
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 maxi 
mum indication on the VTVM.
Secure the nut with a drop of locking paint.
Control Setting:
OUTPUT: Set for convenient output level.
1.
2.
NOTE
Except for the Playback Frequency Response checks,
all alignments in the PLAYBACK PERFORMANCE
have to be done with the EQ switch set to position 3
only unless there is a special reason which requires
that other positions also be checked.
ADJUSTING FOR +13 V
Apply AC power to the deck and set the POWER
Switch to IN.
Connect the DC Voltmeter between #11 terminal (+)
of the 16P Plug and ground.
Adjust VR601 to provide the desired D.C. output
voltage of + 13 V.
ADJUSTING FOR +24 V
Change connecting point of the DC Voltmeter to #10
terminal of the Plug (+) and ground.
Adjust VR602 for +24 V.
DECK
under TEST
a.
1.
Record Solenoid
J?
L>
VTVM
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4<L) ,
1(L) •
6-2-1. RECORD/PLAYBACK HEAD AZIMUTH
ADJUSTMENTS
OSCILLOSCOP E
o
(( 11 °
)) o
o
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