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12.
ELECTRICAL
ADJUSTMENT
Note:
(1)
Before
connecting
the measuring equipments to the
input or the output jack of the machine,
take the
impedance-matching
correctly as shown
below.
ingiae
Rated Input Level
Outiat
Rated Output Level
P
(Input Impedance)
men
{Load {mpedance)
mic | -604B(6002) | yine |
7
0dB
(100k2
AUX | -10dB(10kQ) || OUT
f
/
REC/PB
REC/PB
Connec-
-33 dB(80kQ)
| Connec-
0dB (100k)
tor
tor
a cee
Input Connection
(2)
LINE OUT
During
the adjustment,
the MIC
VR
and the AUX
VR
should be set at the position described
below,
unless otherwise specified.
MIC VR...... Set
them
to
the
position
where
the
LINE OUT
level is 0dB (0.775V) when
delivering
a
1kHz
signal
of -60dB
(0.775 mV) into the MIC jack with the
AUX
VR
set to the minimum
position
and the MONITOR
SW set to SOURCE
position.
(3)
(4)
()
(6)
AUX
VR..... Set
them
to
the
position
where
the
LINE
OUT
level is OdB (0.775V) when
delivering
a
1 kHz
signal
of -10dB
(0.24V)
into
the AUX
jack
with
the
MIC
VR
set to the minimum
position
and the MONITOR SW set in SOURCE
position,
Before making the head adjustment, demagnetize and
clean the RECORD
head and the PB head with swab
or soft cloth dampened
with denatured
alcohol.
The switches should be set in the following positions,
unless otherwise specified.
TAPE
SELECT
SW...
NORMAL
NOISE
SUPPRESS
SW......... OFF
A new tape or a sufficiently-demagnetized tape should
be used as a blank test tape.
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> Z >
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Power Voltage Adjustment
Tape Pass Adjustment
Tape Curl Adjustment
~
P.B. Head Azimuth & Angle
Adjustments
P.B. Head Phase Check
P.B. Output Level Adj. & Level Meter
Calibration
P.B. Equalizer Adjustment
P.B. S/N Ratio Check
Trap Coil Adjustment
Record Head Azimuth and Track
Position Adjustments
Record Head Phase Check
Record Bias Adjustment
ee
ray
wn
Record Level Adjustment
Record Equalizer Adjustment
Dummy Coil Adjustment
Erase Ratio Measurement
Overall 'requency Response
Measurement
Overall S/N Ratio Measurement
Distortion Measurement
BEEORSEEO
GOE8
6
Cross-talk
Measurement
(between
channels)
Cross-talk
Measurement
(between
tracks)
an
~
7
)
—
t
t
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