Teac A-6300 - FREQUENCY RESPONSE, LEVEL, AND NOISE MEASUREMENTS

VU METER CALIBRATION
1. Place METER switch in NORMAL position. Playback head switch to 2 track.
2. Play the 400 Hz tone (1% THD) in Section 1 of the Test Tape.
3. With MONITOR switch at TAPE position, adjust VR-202/204 for
a reading of 0 VU on the lower scale of the VU meter.
FREQUENCY RESPONSE 2T.4T -
The following check should be run on both PLAYBACK heads (2T and 4T)
1. Place Tape SPEED switch in LOW position.
2. Thread a TEAC Test Tape YTT-1003 on the unit.
3. Compare the readings obtained on the Test Set with the response
limits given in Fig. 11-2.
4. If adjustment is required, adjust VR-101/103 for Equalization at
7-1/2 ips (19 cm) speed.
5. Place Tape SPEED switch in HIGH position.
6 . Thread a TEAC Test Tape YTT-1004 on the unit.
7. Repeat step 3. Check for best frequency response.
8 . If adjustment is required, adjust VR-102/104 for Equalization at
15ips (38 cm) speed .
NOTE
If the frequency response does not meet specified response limits
especially at the high end, the specified head should be carefully
recleaned. If frequency response is still out of specifications,
head azimuth must be re-adjusted.
NOTE
If the frequency response does not meet
specified response limits, especially
at the high end, the specified head
should be carefully recleaned. If fre¬
quency response is still out of speci¬
fications, head azimuth must be re¬
adjusted.
Fig. 11-2 Frequency Response Limits -Playback-
DIFFERENCE LEVEL (Between Channels) -
With a Test-Set connected to the OUTPUT jacks and using
TEAC Test Tape, the readings listed below should be
obtained at the specified frequency and tape speeds.
0.5 dB or less at 400 Hz signal
3 dB or less at 40 Hz-22 KHz (HIGH speed)
40 Hz-14 KHz (LOW speed)
4 dB or less at 400 Hz- 16 KHz for 4 track
- 2 2 -