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6.2
ELECTRICAL ADJUSTMENTS
Adjustment Conditions
List of Adjustments
1. The mechanical adjustments must be completed first.
2. The head must be cleaned and demagnetized.
Playback sections
3. Turn power on allow the deck to warm up for at least a few
1. Head azimuth adjustment.
minutes before commencing any electrical adjustments.
2. Playback level adjustment.
4. The reference signal is O dBv=1 Vrms.
5. Connect a 50 kQQ (or between 47k to 52 kQ ) load resistance
Recording sections
to the OUTPUT terminals.
1. Bias oscillator adjustment.
6. Unless otherwise specified, the switches listed below are left
2. Bias trap adjustment.
in the positions indicated.
3. Recording bias adjustment.
DOLBY NR
: OFF
4. Recording level adjustment.
TAPE SELECTOR
: NORM
5. Level meter check.
6. AUTO BLE adjustment.
Test Tapes
STD-331B
: Playback adjustments
(See Fig. 6-1)
STD-630
: NORMAL blank tape
STD-620
: CrO2 blank tape
STD-610
: METAL blank tape
068
30s
0 dB: 315 Hz, 160 nwb/m
Fig. 6-1
Constants of the test tape STD-331B
PLAY
BACK
Azimuth adjustment
screw
RECORDING
Fig. 6-2
Head azimuth adjustment
Fig. 6-3
Frequency response zone
31
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