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CT-NGOR,
CT-S55R
5.
Level Meter Check
| |
Mowe |
Input signal & test tape
REC-
EC-PAUSE | Apply a 315Hz/-10dBv
(316mV) signal to the LINE
INPUT terminals.
6. Erasure Current Adjustment
iy
Mode
Input signal & test tape
Adjustment location
Measuring location
Adjustment value
REC
Load the STD-610 standard
| V303
.
170mVt5mV
AC
tape without an input signal.
7. Recording and Playback Frequency Response Adjustment
| |
Mode |
Input signal & test tape
Adjustment location
Adjustment value
-37 9dBv (12.7mV)
STOP
Set the TAPE SELECTOR
switch to the NORM position.
2
REC-PAUSE
Measuring location
Adjustment location
Adjustment value
Check
that the level meters "'OdB"' light
up
within
-17.9dBv+1.8dB
of
the
signal output level.
REC LEVEL controt
|TP.DOL L (L ch.)
TP.DOL R (R ch.)
Measuring location
REC LEVEL control
|TP.DOL L (L ch.)
TP.DOL R (R ch.)
Apply a 315Hz/-30dBv
(31.6mV) signal to the
LINE INPUT terminals.
REC/PLAY
Left and right OUT-
PUT terminals.
The
6.3kHz
playback
level
is +1.0dB
against 315Hz
level (Playback the signals
recorded on the STD-608A)
Record the above signal level | V302 (Left channel)
onto the STD-608A test tape | V301 (Right channel)
at 315Hz and 6.3kHz, and
playback.
Change the test tape, tape selector and DOLBY
NR switch positions, and check that the frequency response is satis-
factory (See Fig. 10-5). If the response does not lie within the specified range, readjust V302 and V301 that the 6.3kHz
playback level is O~+1.5dB against 315Hz level in the step 3.
8. Recording Level Adjustment
Mode
Input signal & test tape
Adjustment location
Adjustment value
| Remarks
|
STOP
Set the TAPE SELECTOR switch to the NORM position.
F REC-PAUSE | Apply a 315Hz/-10dBv
REC LEVEL control
|TP.DOL L (L ch.)
-17.9dBv (127.3mV)
5
(316mV) signal to the
TP.DOL R (R ch.)
LINE INPUT terminals.
Set the DOLBY
NR switch to the ON position.
REC/PLAY
| Record the above signal level | V102 (Left channel)
|TP.DOL L (L ch.)
-17.9dBv (127.3mV)
onto the STD-GO8A test tape}
V202 (Right channel)
| TP.DOL R (R ch.)
and playback.
Set the TAPE SELECTOR
switch to the CrO, position.
6
Record the above signal onto|
Confirm
TP.DOL L (L ch.)
|-17.948v + 1.5dB
the STD-603 test tape, and
TP.DOL R (R ch.)
playback.
|
Set the TAPE SELECTOR
switch to the METAL position.
8
Record the above signal onto}
Confirm
1 TP.DOL L (L ch.)
—17.9dBv + 1.5dB
the STD-610 test tape, and
TP.DOL R (R ch.)
playback.
31
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