Teac A-6300 - FREQUENCY RESPONSE, BIAS, AND NOISE MEASUREMENTS (A-6300)

VU METER CALIBRATION
1. Place METER switch in NORMAL position.
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 -
1. Place Tape SPEED switch in LOW position.
2. Thread a TEAC Test Tape YTT-1002 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
3-3/4 ips (9.5 cm) speed.
5. Place Tape SPEED switch in HIGH position.
6. Thread a TEAC Test Tape YTT-1003 on the unit.
7. Repeat step 3. Check for best frequency response.
8. If adjustment is required, adjust VR-102/104 for Equalization at
7-1/2 ips (19 cm) speed.
9. Repeat all the above for the Reverse play mode.
Performance should be identical or within specifications.
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.
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Fig. 13-2 Frequency Response Limits
-PLAYBACK-
DIFFERENCE LEVEL (Between Channels) ___
10. W ith 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)
and with in 4 dB for reverse play
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