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RECORDING SECTION
1. ioe
Oscillator
oe
| Input signal & test tape |
signal & test tape
Adjustment location
Measuring location
Adjustment value
|
Remarks
Load the STD-610 test
2. Blas Trap Adjustment
[No.] Mode |
Input signal & test tape
| Adjustment location
|
location
Measuring location|
location |
Adjustment value
|
|
Adjustment value
| |
Remarks
|
REC
Load the STD-610 test
L103 (Lch)
TP. 3 (Lch)
tape with no input signal.
L104 (Rech)
TP. 4 (Reh)
3. Recording Bias Adjustment
¢ Tum ON the DOLBY HX PRO switch on the front panel, and set the BIAS control to the center position.
[No.| Mode |
input signal & test tape
Adjustment location
Adjustment value
Apply a 315 Hz/-20 dBv
REC/
(-20VU meter reading)
PAUSE
signal to the line input
terminals and insert
STD-630.
Record and play back the
Pvrssiy
|
Record and play back
315 Hz signal and a
VR551 (L)
repeatedly, comparing the
10 kHz signal at -20 dBv
LINE OUT
315 Hz and 10 kHz playback
input level.
| vass2(R)
| vass2(R)
levels, and adjust to 0+0.5 dB.
REC
Record the 10 kHz/315 Hz,
—PLAY
| —20 dBv signal on
Cro2
VR501 (L/R)
0 dBv + 1.0dB
STD-620 and play back.
Record the 10 kHz/315 Hz,
—-20 dBv signal on
METAL
VR502 (L/R)
0 dBv + 1.0dB
STD-610 and play back.
Check distortion value after adjustment is completed and confirm that there is no underbias.
4. Recording Level Adjustment
* Tum ON the DOLBY NR switch.
| No.| Mode |
Input signal & test tape
Adjustment location
Measuring location
Adjustment value
Remarks
Apply the 315 Hz/0 dBv
signal to the line input, and
Lg ; pos
load STD-630 (NORM).
g i a
a
REC level control volume
Recording bias adjust-
Repeatedly record, playback
| ment and rcording level
and adjust so that the
adjustment with STD-630
playback signal level
must be performed
becomes —15.2 dB.
accurately as reference
for BLE adust ment.
VR401 (Lch)
Record and play back the
315 Hz/0 dBv signal.
VR402 (Rch)
TP. 3 (Lch)
Record the 315 Hz/0 dBv
TP. 4 (Reh)
signal on STO-620
(CrO2), and play it back.
~15.2 dBv + 1dB
Record the 315 Hz/0 dBv
signal on STD-610
(METAL), and play it back.
-15.2 dBv + 1dB
33
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