66
XR-VS90SW, XR-VS90, XR-VS70SW, XR-VS70
6.2 CASSETTE DECK SECTION
1. Tape Speed Adjustment
Mechanical Adjustment
Electrical Adjustment
Check the following before starting.
• Adjustment points and test points are shown in Fig. 5, Fig. 7 and Fig. 9.
• Test tape : NCT-111 (3kHz, 30min).
No.
Mode
Test Tape
Adjusting
Points
Measurement
Points
Adjustment Procedure
Remarks
1
Deck
Ι
PLAY
NCT-111
(Playback : 3kHz)
ADJ. VR on
CASSETTE
MECHA (Fig. 5)
TAPE TEST
POINT (Rch)
(AF Assy)
Press the PLAY SW and adjust so that the reading
becomes 3000Hz
±
20Hz. Confirm that wow & flutter
level is below 0.3% (in the reverse direction, confirm
that the reading is within 3000Hz
±
60Hz).
Front Side
AF Assy
Fig. 5 Tape Speed ADJ. Point
Cassette
Mechanism
Section
(Side View)
Tape Speed
ADJ. VR
(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.
STD-331E : For playback check
STD-632 : Normal blank tape
(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) 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.
Playback Adjustment (Decks
Ι
and
ΙΙ
)
(1) Head Azimuth Adjustment
(2) Playback Level Adjustment
Recording Adjustment (Deck
ΙΙ
)
(1) Bias Oscillation Frequency Adjustment
(2) Recording Bias Adjustment
(3) Recording Level Adjustment.
(4) ALC Operation Check
∗
As the reference recording level is 250nwb/m for STD-331E,
the recording level will be higher by 4 dB for STD-331B
(160nwb/m). When adjusting, pay carefull attention to the type
of tape used.
6.2.1 For XR-VS90SW and XR-VS90
