.
AMPLIFIER ADJUSTMENTS
.Make the following adjustments after first cleaning the head and checking the adjustment of the head azimuth.
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RR5mimsm (R-CH)
Id”
VR302 VR301
TAPE OUT (R-CH) (L-CH)
R-CH EL-CH TAPE ‘“A“
CN373 PLAY GAIN
Immg
o
VR308 VR307
(R-CH) (L-CH) (
BIAS
1
x67 k)
o&6
Adjustment Item Test tape ;~OLsB;,
(a) Playback output TCC-130
adjustment (Dolby tape) CWF
(b) Recording IPlayback AC-224 ~F
gain adjustment (Normal)
(c) Recording IPlayback Ac *24
frequency response -
adjustment (Normal) ‘F
Measuring input output Adjustment Adjustment
Instrument connection connection location value
III(TAPE “A”) SVR3011
AC-voltmeter -TAPE OUT SVR302
(CN373) (TAPE “B”) SVR303 580 ‘v
SVR304
VIDEO
AC-voltmeter -44 dB, TAPE OUT SVR307 Otl dBat
AF-oscillator 1kHz, (CN373) SVR308 1kHz and
10 kHz 10 kHz
(a) Playback output adjustment
(1)TAPE “A”
Play the test tape and adjust SVR301 (L-CH) and SVR302
(R-CH) so that playback output becomes !N30mV.
:2) TAPE “B”
Play the test tape and adjust SVR303 (L-.f3-t) and SVR304
(R-CH) so that playback output becomes 580mV.
b) Recording /Playback gain adjustment
DOLBY NR switch :OFF
Input signal :-24 dB, 1kHz
Tape to be used :NORMAL (AC-224, etc-)
Introduce input signals to the VIDEO terrrrinals,
and with the unit in the REC, PAUSE mode.
Record the input signal.
Press the REWIND button and rewind the tape
to the beginning of the recording just made.
Press the PLAY button.
Adjust SVR305 (L-CH) and SVR306 (R-Ct-1)
so that the recording and playback outpdt
level difference become f1dB.
Repeat steps (1) to (5).
(c)
(1)
(2)
(3)
(4)
(5)
(6)
Recording /Playback frequency response
adjustment
DOLBY NR switch :OFF
Input signal :-44 dB, 1kHz, 10 kHz
Tape to be used :NORMAL (AC-224, etc.)
Introduce input signals to the VIDEO terminals.
With the unit in the REC mode.
Record these input signals (1 kHz +10 kHz +1kHz +
10 kHz).
Press the REWIND button and rewind the tape to the
beginning of the recording just made.
Press the PLAY button.
Adjust SVR307 (L-CH) and SVR308 (R-CH)
so that the 10 kliz and 1kHz output level difference
become ~1dB.
Repeat steps (1) to (5).
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