Teac A-3440 - Playback Performance Adj.; Playback Head Azimuth Adj.; Frequency Response - Playback; Signal-to-Noise Ratio - Playback

Tape Speed | Frequency Limits | Phase Difference
7-1/2 ips. | 400 Hz — 6 kHz
NOTE: Phase difference readings are made between ch 1
and ch 3 and between ch 2 and ch 4.
8. After adjustment, secure the screw with a drop of lock-
ing paint.
9-2 OUTPUT LEVEL SETTING
9. The Specified Output Level Setting must be used.
See Item 8-3 step 12 above.
10. Connect a VTVM to the DECODER SEND jack 1.
11. Play the 400 Hz 0 dB tone in section 1 of the YTT-1003
Test Tape.
12. Adjust PLAY CAL R143 for —8 dB (308 mV) at DE-
CODER SEND jack 1.
13. Insert: shorting connector between DECODER SEND
and RCV jacks.
14. Check for —8 dB (308 mV) at OUTPUT jack. (QUTPUT
Level control at position “8”’).
MAX. OUTPUT LEVEL
15. Turn the OUTPUT Level control fully clockwise (max.)
and check for —2 dB +2 dB at OUTPUT jack 1.
16. Reduce OUTPUT Level Control until —8 dB (308 mV)
is obtained on the VTVM.
NOTE: This is the Specified Output Level Setting. Do not
disturb this setting until the remaining adjustments
have been completed.
Fig. 8-5 Specified Output Levet Setting
9-3. VU METER INDICATION CHECK
17. With the controls set as described above check that the
VU METER reads 0 VU +0.5 VU.
18
9-4 FREQUENCY RESPONSE — PLAYBACK
18. Play the Test Tape and compare the readings on the
VTVM with the response limits given in Fig. 8-6.
Tape Speed Play EQ Adj.
HIGH
LOW
Test Tape
YTT-1004
YTT-1003
R117
R122
: il Moo
tT AL
RESPONSE IN 8
4
22K 5OK
FREQUENCY IN Hz THi27e
Fig. 8-6 Frequency Response —Playback—
NOTE: If the measured frequency response does not meet
the specified response limits, especially at the high
end of the spectrum, check that the heads are free
of accumulated dirt or oxide. If they are comple-
tely clean the head azimuth must be readjusted.
9-55 SIGNAL-TO-NOISE RATIO — PLAYBACK —
19. OUTPUT Level Control should be at the Specified Out-
put Level Setting.
20. Remove the Test Tape from the deck. Hold the shut-off
arm (right) in the ON position.
21. Press the PLAY (>>) button.
22. The VTVM connected to the OUTPUT jack should in-
dicate the values below.
OUTPUT SELECT SW | Tape Speed S/N
7-1/2 i ips —58 dB
NOTE: This corresponds to a signal-to-noise ratio of 50 dB
(for PLAY 7% ips). It is the difference between the
residual noise of —58 dB and the specified output
level of —8 dB.