Teac A-300 - Recording Performance Adjustments (Continued); Distortion and Frequency Response Checks

6-3-4. DISTORTION CHECKS
Specifications:
CrO2: 2.2% or less
NORMAL: 2.5% or less
CrO2
1. Load a TEAC MTT-506 test tape.
2. Apply and record a 400 Hz test tone at —12 dB (195
mV).
3. Rewind and play this recorded section.
4. Read the indicated value on the distortion analyzer.
NORMAL
5. Repeat the “CrO2” procedure, with the following ex-
ceptions.
BIAS/EQ switches: NORMAL
Test tape: MTT-501
6-3-5. FREQUENCY RESPONSE -OVERALL—
CrO2 Tape
1. Connect the deck and the test equipments as shown in
Fig. 6-10.
2. Load aTEAC MTT-506 test tape.
Apply and record a test signal at -42 dB (6.15 mV).
4, With the simultaneous record/playback function, make
sure the readings on the AC voltmeter are within the
response limits.
5. In case of any deviation in the high frequency range of
the response limits, clean the heads and do the L104/
L204.
Ww
NORMAL Tape
6. Repeat the “CrO2” procedure, with the following ex-
ceptions.
BIAS/EQ switches: “NORMAL” position
Test tape: MTT-501
TEST TAPE: MTT-506
DOLBY NR: OUT
+4
| |
2
I
©
RESPONSE IN dB.
-3 |
=a
SK 63KY TOK 12.5K SOK
8K
Fig. 6-13 Overall Frequency Response Limits (for BIAS/EQ:CrO2)
i
FS
40 50 63-100 125 400500 1K
FREQUENCY IN Hz
16
OSCILLOSCOPE
Preparations:
DISTORTION ANALYZER
OSCILLATOR
under TEST
Fig. 6-12 Connection
Switch Setting:
BIAS
DOLBYNR
|
MONITOR
Control Setting:
OUTPUT: Specified Setting (See 6-1-2)
LINE: Specified Setting (See 6-2-2)
MIC: Minimum
Preparations:
Connection: See Fig. 6-10.
Switch Setting:
BIAS DOLBYNR | MONITOR
Control Setting:
OUTPUT: Specified Setting (See 6-1-2)
LINE: Specified Setting (See 6-2-2)
MIC: Minimum
i
+4
+3
Bitz
z
gy O
2
g-2 |
ra
r aa
| I if
4050 63 100 125 400 S00 BK 6.3K ¥ 10K . SOK
BK
FREQUENCY IN Hz
Fig.
6-14
Overall
Frequency
Response
Limits
(for
BIAS/EQ:NORMAL)