Teac A-4300SX - Power Supply Check and Adj.; Playback Head Azimuth Adj.

8-2 ADJUSTMENT SEQUENCE CHART
POWER SUPPLY PLAYBACK HEAD OUTPUT VU METER FREQUENCY SIGNAL-TO-NOISE
CHECK AND ADJ. [“"} AZIMUTH ADJ. LEVEL SET LEVEL SET RESPONSE —PLAYBACK~ RATIO —PLAYBACK—
* MIC INPUT VU METER SPECIFIED LINE < MONITOR HEADPHONE
| LEVEL CHECK LEVEL SET CONTROL SETTING LEVEL SETTING OUTPUT CHECK
BIAS TRAP BIAS RECORD HEAD
ADJUSTMENT LEAKAGE CHECK AZIMUTH ADJ.
BIAS
RECORD
PRSEnGE
ADJUSTMENT
|
a
|
~
OVERALL
~
|
CROSS TALK
REJECTION
TRACK TO TRACK
DISTORTION
CHECK
CHANNEL OPTIMUM ERASURE SIGNAL-TO-NOISE
SEPARATION MEASUREMENT RATIO —- OVERALL —
Fig. 8-1 Adjustment Sequence Chart
PLAYBACK PERFORMANCE
8-3 POWER SUPPLY CHECK AND ADJ.
1. Remove metal panel on Rear side of the deck for access
to the electrical adjustments.
2. Depress power SW to ON.
3. Connect a VITVM between the Control P.C.B. Test Point
No. 3 and ground. See Fig. 8-2 below.
4. Adjust VR-1 for +23 V DC.
VRI
Fig. 8-2 +23 V DC Test Point
8-4 PLAYBACK HEAD AZIMUTH ADJ.
NOTE: Befoite proceeding with the following head align-
ments be sure that heads have been properly
mounted as to HEIGHT, TILT and TANGENCY.
See page 9.
— Fine Adjustment —
TAPE SPEED SW . . . 3-3/4 ips (9.5 cm)
OUTPUT SW .............. TAPE
METERSW............ NORMAL
14
1. Connect a VTVM to OUTPUT jacks.
2. Remove the head housing by removing 2 screws.
3. Thread the TEAC YTT-1002 Test Tape on the deck.
4. Play the 16 kHz/—10 dB Test tone in section 2 of the
Test Tape.
. Slowly rotate the azimuth Screw until maximum indica-
tion is achieved on VTVM.
. Connect an oscilloscope to the OUTPUT jacks.
. Adjust the azimuth screw (If necessary) until the oscillo-
scope shows that the signals are less than 45° out of
phase at 10 kHz signal.
. Secure this screw with a drop of locking paint.
.
Depress
the
«@
button
and
turn
agimuth
adjustment
screw
Fig.
6-3
of
the
reverse
playback
head
for
maxi-
mum
indication
on
the
VTVM
or
scope.
nm
a On
eo 90
OSCILLOSCOPE
AMPL SPKR
DECK
under TEST
T- 309-2
Fig. 8-3 Head Alignment Fine Adjustment Set-up and
Test Connections (PLAYBACK)