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Electrical Adjustment
Check the following before starting.
(1) Confirm that the tape speed adjustment has been completed.
(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-132X : For playback check
(5) Provide yourself with the following measuring devides:
•
AC millivoltmeter
•
Low-frequency oscillator
•
Attenuator
•
Oscilloscope
(6) Adjust both right and left channels unless otherwise specified.
(7) 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.
(8) Always follow the indicated adjustment order.
Otherwise, a complete adjustment may not be achieved.
0 dB
30s
0 dB: 315 Hz, 250 nwb/m
30 s
315 Hz
6.3 kHz
FWD Azimuth Adjustment Screw REV Azimuth Adjustment Screw
Fig. 4 Head Azimuth Adjustment
Playback Adjustment
(1) Head Azimuth Adjustment
•
Do not switch between forward and reverse operation with the screwdriver inserted.
Step
Mode
Input Signal/ Test Tape
N C T - 1 3 2 X t e s t t a p e
1
PLAY
(Playback: 10kHz, -20dB)
30 s
30 s
10s
10s .......................................................................................................... 10s
12.5
10 kHz
315 Hz
14 kHz
kHz
Fig. 3 NCT-132X Test Tape
Adjusting Points
Head azimuth adjustment
screw (Fig. 4)
X-MDX717, XR-MDX717
Playback Adjustment
(1) Head Azimuth Adjustment
* When the tape is played with both of side panel L and R removed
(state that reception front is floating from ground). when adjusting ,
the noise might be superimposed.
In this case, the front chassis must short circuit to the CD mechanism
cover in the lead wire.
6.3
10 kHz 8 kHz
4 kHz 2 kHz
1 kHz
kHz
PLAY BACK
250
3dB
Fig. 5 Frequency Characteristics
Measurement
Adjustment
Points
CN453 PB L ch
Max. playback
PB R ch
signal level
500
250
125
63 Hz 40 Hz
Hz
Hz
Hz
12.5k
10k
3dB
4dB
Remarks
Value
After adjustment, apply
silicon bond to the head
azimuth adjustment screw.
–20 dB
61
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