Akai M-10 User Manual

3.
ADJUSTMENT
OF
RECORDING
BIAS
FREQUENCY
AND
VOLTAGE
TOO!
Fig. 7-3
‘Proper
bias
Frequency
of
the
X-200D
is
95
KC
(45
KC).
The
frequency
can
be
adjusted
by
conveerting
the
value
of
the
condenser
(C.104
1000p)
and
LO101
(VAC).
Proper
Bias
Voltage
is
105
V
(+2
V).
The
voltage
can
be
adjusted
by
turning
the
V.A.C.
(LO101)
in
the
bias
oscillator
circuit.
Erasing Voltage is 90 V (+5 db).
4.
ADJUSTMENT
OF
D.C.
BIAS
CURRENT
OF
POWER
OUTPUT
TRAUSISTORS
-WITH
NO
INPUT
SINGNAL
(SEE
FIG,
7-4)
TRI,TR2
(a)
aa
(4) 22.5V
T50Ol
EXTERNAL
(¢} © SPEAKER
+ L8 O--O—
“a 3 oo ||
“2 Ba
RESISTOR
(22.5V
Fig. 7-4
1)
Disconnect
collector
wire
of
Transistor
TRI
and
TR2
2)
Connect
the
Ampere
Meter
(maximum.
scale
250mA)
to
the
collector
circuit
(a)and
(b),
(c)
and(d)
3)
Connect
the
8
Q
resistor
to
the
External
speaker
Jack
4)
Tum
the
Volume
control
back
to
the
minimum
position
22
5)
Adjust
the
potentiometer
VRSO1
and
VRS502
(1002)
until
the
Collector
Current
reahes
35 ~ 40.mA
Caution:
It
is
important
that
the
potentiometer
be
adjusted
so
that
both
meters
indicate
equal
levels.
5.
ADJUSTMENT
OF
THE
LEVEL
CONTROL
VR601
VU METER
| Tone Lites AS
LEVEL VOLUME ea
INPUT
CONTROL
CONTROL
RESISTOR
Fig. 7-5
1)
Connect
Audio
Oscillator
to
the
Line
input
and
supply
1000
Hz
sine
wave
2)
Set
Record
Level
control
so
that
the
VU
meter
indicate
“O”
VU
3)
Connect
8
ohms
(10
W)
resistor
to
the
External
speaker
Jack
4) Connect V.T.V.M. across 8 ohms resistor
5)
Turn
the
Volume
Control
up
to
the
maximum
position
adjust
Level
Control
potentiometer
so
that
Output
Voltage reaches 8 volts.
an
~m
VT.V.M.
-

Akai M-10 Specifications

General

Brand	Akai
Model	M-10
Category	Tape Deck
Language	English