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ELECTRICAL ADJUSTMENTS (continued)
RECORDING BIAS ADJUSTMENT
for Chromium Dioxide Tape
LEFT CHANNEL
Connect an audio signal generator and an attenuator to the
left channel LINE IN, and a VTVM to the left channel LINE
OUT
as illustrated. Then, insert
a chromium
dioxide tape
into
the cassette
(Example:
BASF
TP-18CrO2
C401R)
compartment.
Audio Signal
Generator
1kHz
1V RMS
Attenuator
10 mV (—40 dB)
Dummy
Load
1 kHz=14 kHz (+1 dB)
Set the Equalizer Switch to CrO2, and the Bias Switch to
HIGH.
Set the Monitor Switch to TAPE and feed the 1 kHz signal
from the audio signal generator at 10 mV
(—40 dB) to the
unit with
the INPUT
Level Control set to the maximum.
Then,
set the
unit
in the recording
mode
and
read the
output level on the VTVM.
. While the signal is being recorded, change the audio signal
generator from the 1 kHz signal to the 14 kHz signal. Then,
check that the 14 kHz signal output level is identical to the
1 kHz signal output
level or the deviation
is +1 dB on the
VTVM.
If not, adjust the potentiometer
(P7109) and re-check the
outputs
of each signal by alternately
changing
the audio
signal generator to the 1 kHz signal and the 14 kHz signal.
Repeat the above adjustment until the specified output
is
obtained.
RIGHT CHANNEL
Connect an audio signal generator and an attenuator to the
right channel
LINE
IN, and a VTVM
to the right channel
LINE OUT. Then, adjust the potentiometer (P209) for the
right channel by following the same procedure as for the left
channel.
e
For Ferrichrome Tape
Set the Switches as follows:
* Equalizer Switch
* Bias Switch
Then, insert a ferrichrome
tape
(Example:
SONY
DUAD
C-60) into the cassette compartment.
Adjust
the
potentiometers
by
following
the conditions
described
below
and
the
same
procedure
as
for
the
Chromium Dioxide Tape.
* Input Signals
1 kHz and 14 kHz
Sl nput evel
4
saree
eens BUA
Me 10 mV (—40 dB)
* Potentiometers for adjustment
Lettiichannel:
ce
2ekck ou Daesuk ed wits
GS
ow OB P108
Rightschannel
0 fo
ete
he
eee
wena
P208
e
For Normal Tape
Set the Switches as follows:
* Equalizer Switch
...............0...0..
Fe203
* Blas: SWITCH
tn
omits do Oh cae de
eae
Oe
a
Vleck LOW
Then,
insert
a normal
tape
(Example:
BASF
TP-18LHS
T308S) into the cassette compartment.
Adjust
the
potentiometers
by
following
the conditions
described
below
and
the
same
procedure
as
for
the
Chromium Dioxide Tape.
* Input Signal... 2.
1 kHz and 13 kHz
* put LOVE)
ve. 5 ob Sow eae Bee
we 10 mV (—40 dB)
* Potentiometers for adjustment
eft:channe!
oud
new bhi Pas ee ede
he
es P110
Right:channel
4.4 2.8.06
ek ee a ke oo
ed
eee
P210
RECORDING GAIN ADJUSTMENT
e@
For Chromium Dioxide Tape
LEFT CHANNEL
1. Connect an audio signal generator and an attenuator to the
left channel
LINE IN as illustrated. Then, insert a chromium
dioxide tape (Example: BASF TP-18CrO2
C401R)
into the
cassette compartment.
Audio Signal
LINE
IN—
RECORD
Generator
1 kHz
1V RMS
Attenuator
200mV (—14 dB)
2. Set the Equalizer Switch to CrO2, and the Bias Switch to
HIGH.
3. Set the Monitor
Switch
to SOURCE
and feed the 1 kHz
signal from the audio signal generator at 200 mV (—14 dB)
to the unit.
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