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AMPLIFIER
ADJUSTMENTS
® Make the following adjustments after first cleaning the head assembly and checking the adjustment of the head azimuth.
CN373
TAPE OUT
PL
BE
VR351
ff VR373
REC (L-CH)
(fa VR371
PLAY(L-CH)
VR3746
BIAS(L-CH)
i
VR384
BIAS(R-CH)
VR383
REC (R-CH) itis
VR381
PLAY (R- CH) (2
ice
;
.
Test Tape
DOLBY
Measuring
Input
Output
Adjust
Adjust
justment Item
Pe | NR SW. | Instrument
| Connection
connection
location
value
TCC-130
VR371
(L-CH
(a)
Playback output
(DOLBY
AC-Voltmeter
TAPE OUT
(
}
300 mV
VR372 (R-CH)
TAPE)
(b)
Recording/
AC-224
AC-Voltmeter
VIDEO
TAPE OUT
VR373 (L-CH)
300mV
Playback gain
(NORMAL)
AF-Oscillator | - 10 dB, 1kHz
VR383 (R-CH)
+0.5 dB
VIDEO
at 1 kHz
- 30 dB, 1 kHz,
and 10 kHZ
10 kHz
0+ 1.0d8
AC-224
AC-Voltmeter
(NORMAL)
AF-Oscillator
(c)
Recording / Playback
frequency response
VR374 (L-CH)
VR384 (R-CH)
TAPE OUT
a.
ADJUSTMENTS
(a) Playback output adjustment
(c) Recording / Playback response adjustment'
Dolby NR switch : OFF
Input signal : - 30 dB, 1 kHz, 10 kHz
(1) Play the test tape and adjust VR371 (L-CH) and VR372
Tape to be used : NORMAL (AC-224, etc.)
(R-CH) so that playback output becomes 300 mV.
Dolby NR switch : ON
(1) Introduce input signals to the VIDEO terminals.
(b) Recording / Playback frequency gain adjustment
(2) With the unit in the REC. mode.
input signal : - 10 dB, 1 kHz
Record these input signals (1 kHz
> 10 kHz =>
Tape to be used : NORMAL (AC-224, etc.)
1 kHz — 10 kHz).
(1) Introduce input signals to the VIDEO terminals, and,
(3) Press the REWIND bution and rewind tape
with the unit in the REC. PAUSE mode, adjustment input
to the beginning of the recording just made.
level for 300 mV out.
(4) Press the PLAY button.
(3) Press the REWIND button and rewind tape to the
10 kHz and 1 kHz and output level differences
beginning of the recording just made.
become 0 +1 dB.
(4) Press the PLAY button.
(6) Repeat steps (1) to (5).
(5) Adjust VR373 (L-CH) and VR383 (R-CH)
so that the recording and playback
output level differences become 300 mV 0.5 cB.
(6) Repeat steps (1) to (5).
-17-
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