XV-EV51
72
1
2
3
4
1
2
3
4
C
D
F
A
B
E
6. ADJUSTMENT
6.1 DECK SECTION
6.1.1 Adjustment condition
7
Adjustment Condition
(1) The ground at the time of adjustment shall be W166.
(Refer to Fig. 6–3).
(2) Clean the heads and demagnetize them using a head eraser.
(3) Set the measurement level to 0 dBV = 1 Vrms.
(4) Use the specified tape for adjustment. Use the labeled (A) side
of the test tape.
NCT–111
: For Tape Speed adjustment
NCT-112
: For Playback adjustment
STD–633
: Normal blank tape
*
As the reference recording level is 250 nwb/m for NCT–
112, the recording level will be higher than 4 dB for NCT–
112 (160nwb/m).
When
adjusting,
pay
carefully
attention
to the type of tape used.
(5) Provide yourself with the following measuring devides:
÷
AC millivoltmeter
÷
Low-frequency oscillator
÷
Attenuator
÷
Oscilloscope
(6) Adjust both right and left channels unless other wise specified.
(7) Turn the DOLBY NR switch off unless otherwize specified.
(8) Warm up the unit for several minutes before adjustment. In
particular, be sure to warm up the unit in the REC/PLAY mode
for 3 to 5 minutes before starting recording/playback frequency
characteristics adjustment.
(9) Always follow the indicated adjustment order.
Otherwise, a complete adjustment may not be achieved.
7
List of Adjustments
¶
Playback Section
(1) Tape Speed Confirmation
(2) Head Azimuth Adjustment
(3) Playback Level Adjustment
¶
Recording Section
(1) Recording Bias Adjustment
(2) Recording Level Adjustment
Dolby noise reduction manufactured under license from Dolby
Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol are trademar ks of Dolby
Laboratories Licensing Corporation.
Fig. 6-2 Test Tape NCT– 112
Fig. 6-1 Frequency Characteristics
0 dB
–20 dB
30s
0 dB: 315 Hz, 250 nwb/m
315 Hz
6.3 kHz
10 kHz
315 Hz
14 kHz
12.5
kHz
6.3
kHz
500
Hz
250
Hz
125
Hz
10 kHz 8 kHz
4 kHz 2 kHz
63 Hz 40 Hz
1 kHz
30 s 30 s 30 s 10s 10s .......................................................................................................... 10s
250
3dB
10k
12.5k
3dB
4dB
PLAY BACK
250
3dB
10k
12.5k
3dB
5dB
RECORDING
For adjustment, use the stereo power amplifier (M-EV51 or M-EV21).
