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@ Recording Adjustment
1. Bias Oscillation Frequency Adjustment
Tape
Selector
(AUTO)
Input Signal"
Measurement
{| Adjustment
Test Tape
Adjusting Points
Remarks
Points
Value
Load the STD —631
Oscillation
When the power is turned
frequency to be] ON while the BAND button
fest tape and set the
Between ®
105.0kHz
is depressed, the frequency
recording mode.
Deck I
T4351
point in Fig.
+2kH7
Gill decrense = 3 EES
3-4 and GND.
a
;
:
2. Recording Level Adjustment
Tape
Selector
Input Signal "Test Tape
Adjusting Points
(AUTO)
Measurement
| Adjustment
Points
Value
Remarks
;
TAPE TEST
Input a 315Hz signal to the
ikipitingnal
POINT
MD/AUX IN terminal and set the
level
(L, Reh)
input selector to MD.
(MAIN Assy)
STD—631 test tape and
Deck
|
igre
Repeat recording, playback
and adjustment until
ee playback the 315Hz
Deck | VR4301 (Leh) | (L, Rch) _| playback level of the 315Hz
ena
VR4302 (Rch) | (MAIN Assy) | signal becomes —5.2dBV.
@ Since this adjustment affects recording bias, prevent
3. Recording "playback Frequency Characteristics Adjustment
distortion from increasing due to underbias.
Tape
Selector
Input Signal Test Tape
Adjusting Points
(AUTO)
Measurement
| Adjustment
Points
Value
Remarks
Input a 315Hz signal to the
seas
MD/AUX IN terminal and set the
Tnpar signal
(L, Reh)
—25.2 dBV
input selector to MD.
Deck I
P
or
'
level
(MAIN Assy)
Load the STD--631 test tape and
TAPE TEST | Repeat adjustment until
playback level of the 10kHz
record " playback the 315Hz and
POINT
signal is within 00:5¢B
10kHz signals. (see the Note
(L, Rch)
below)
VR4351 (Lch)
(MAIN Assy)
from that of the 315Hz
VR4352 (Rch)
signal.
Note: Set to the same level used for the 315Hz input signal at step 1.
4, ALC Operation Check
Tape
Selector
Input Signal "Test Tape
Adjusting Points
(AUTO)
Measurement
Adjustment
Points
Value
Input signal level
Input 2 315Hz signal to the
[Tap signal evel TAPE TEST
MD/AUX IN terminal and set the | Set to a level +10dB
input selector to MD.
above the input level at
step 1.
Remarks
POINT
(L, Rch)
(MAIN Assy)
—2.2+2.5dBV
1-17
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