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¢ Adjustment and measurement are usually made in the AF assembly, unless specified otherwise.
¢ Set the graphic equalizer to OFF, the BALANCE control knob to Center and the MIC LEVEL control knob to
MIN
¢ The function should always be set to "TAPE" unless otherwise specified.
Adjustment of Mechanical System
* Test tape: STD-301 (3 kHz 30 min)
¢ Setting of double speed mode: Short-circuit TP801 and TP802 of the DECK CTRL assembly. To release the
mode, break the short circuit.
. Adjustment of tape speed
the STD-
DECK CTRL
Assembly
VR803
aes
DECKCTRL | 'ch
Assembly
VR802
Adjustment of Electric System
MiCheck
and conduct
the following
before
adjusting the electric system.
. Adjustment of tape speed has been completed.
. Clean and demagnetize the head using a head
eraser.
3. When measured, the level should be 0 dBV = 1
Vrms.
4. Use side A of the specified tape for adjustment.
STD-331B: For adjustment of playback system.
STD-630: NORMAL blank tape
5. Prepare the following measuring devices:
AC
millivoltmeter,
Low-frequency
oscillator,
Attenuator, Oscilloscope
6. Adjust both L and R channels, unless specified
otherwise.
7. Set the DOLBY
NR
switches to OFF, unless
specified otherwise.
8. Warm
up the unit for several minutes before
adjustment.
Especially
before
adjusting
the
frequency
characteristics
of
recording
and
playback,
warm
up
for 3 to 5 minutes
in
REC/PLAY mode.
9. Make
sure to follow the proper order of the
adjustment procedure. Any change in the order
may cause an imperfect result.
Nr
54
DECK CTRL
Assembly
ae
VR801
TP-L
Es
=
Press the PLAY SW and adjust the frequency
to 3010 Hz +10 Hz. Make sure that the wow
and flutter is within 0.2 %.
Press the PLAY SW in double speed mode and | Release the double
confirm that the frequency is 6000 Hz +1000 | speed mode after
Hz. Note down the figure.
adjustment.
Press the PLAY SW in double speed mode and | Release the double
adjust the frequency to be within +30 Hz of the | speed mode after
figure recorded at step No. 2.
adjustment.
Press the PLAY SW and adjust the frequency
to 3010 Hz +10 Hz. Make sure that the wow
and flutter is within 0.2 %.
List of Adjustment
Deck |
1. Head azimuth adjustment
2. Playback level adjustment
Deck Il
. Head azimuth adjustment
. Playback level adjustment
. Bias oscillation frequency adjustment
. Recording level adjustment
Om
& bore
Checking of Deck I
1. Make sure the ALC is operating properly.
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