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RECORDING SECTION
1.
ae
|
Bias Oscillator Adjustment
[No.|
Mode |
Input signal & test tape
Adjustment location
Load the STD-610 test
tape with no input signal.
2.
Erase Current Adjustment
Load the STD-610 test
tape with no input signal.
3-1. Overbias Adjustment
Mode
Adjustment value
Remarks
106 kHz+ 300 Hz
Measuring location
L605
Adjustment location
Measuring location
VR605
Adjustment vaiue
Remarks
input signal & test tape
Apply a 6.3 kHz/— 10 dBv
(-— 10VU meter reading)
signal to the Line input
terminals and insert
STD-630.
Record and play back the
6.3 kHz signal at
- 10 dBv input level.
Record the 6.3 kHz/
- 10 dBv signal on
STD-620 and play back.
Record the 6.3kHz/
— 10 dBv signal on
STD-610 and play back.
Measuring location
Adjustment value
Remarks
LINE OUT L, R
terminals
Adjustment location
3.0 dB
overbias
Turn control
clockwise past the
peak to assure
proper overbias
value.
VR6O2 (R)
2.5 dB
overbias
1.0 dB
overbias
| 5. | Turn control clockwise past the peak to assure proper overbias value.
3-2. Frequency R esponse Adjustment
| No. |
Mode
Input signal & test tape
Adjustment location
Adjustment value
Remarks
Apply a 10 kHz/315 Hz/
— 20 dBv signa! to the
Line input terminals and
insert STD-630.
Record and play back the
315 Hz signal and a
10 kHz signal at
- 20 dBv input level.
LINE OUT L, R
terminals
VR601 {L)
VR602 (R)
Record and play back
repeatedly, comparing
the 315 Hz and 10 kHz
playback levels, and
adjust to + 1.5+0.5 dB.
Record the 10 kHz/
315 Hz,
- 20 dBv signal
on STD-620 and play
back.
Record the 10 kHz/
315 Hz, — 20 dBv signal
on STD-610 and play
back.
VR603 (L/R)
+0.5+ 1.0 dB
VR604 (L/R)
+0.5+ 1.0 dB
Check distortion value after adjustment is completed and confirm that there is no underbias.
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