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Fisher MC-620 - Page 9

Fisher MC-620
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DOUBLE
CASSETTE
DECK
ELECTRICAL
ADJUSTMENT
MEASURING
INSTRUMENTS
REQUIRED
Dualtrace
Oscilloscope
VTVM
(AC
voltmeter
with
high
impedance)
Frequency
Counter
Test
Tapes
+
10kHz
Test
Tape
(Example:
TEAC
MTT-215C)
for
Head
Azimuth
Adjustment
+
3kHz
Test
Tape
(Example:
TEAC
MTT-111N)
for
Tape
Speed
Adjustment
HEAD
AZIMUTH
ADJUSTMENT
1.
Connect
the
dualtrace
oscilloscope
and
VTVM
to
the
Test
Point
TP5
(Left
CH.)
and
TP6
(Right
CH.}.
Then,
set
the
dualtrace
oscilloscope
as
follows:
MODE:
ca.
ctcaticrasccuhih
devon
eees
Ge
enaress
CHOP
(chopped)
*
SOURCE
............00..0.0.000.
INT
(internal),
CH1
or
CH2
¢
SWEEP
MODE...............0.00.000000-
AUTO
(automatic)
NOTE:
Adjust
the
field
on
the
oscilloscope
with
the
VOLT.
ADJ.
and
TIME
ADJ.
Load
DECK
1
with
a
test
tape
(Example:
TEAC
MTT-215C)
and
set
it
in
the
forward
playback
mode.
Adjust
the
azimuth
adjustment
screw,
so
that
the
wave
forms
become
maximum
on
the
oscilloscope
and
the
Right
channel
wave
form
overiaps
with
the
Left
channel
one.
Perform
the
same
adjustment
for
DECK
2.
TAPE
SPEED
ADJUSTMENT
Normal
Speed
Adjustment
.
Connect
the
frequency
counter
to
the
test
point
TP6
(Right
channel).
Set
the
Dubbing
switch
and
High
Speed
switch
to
the
OFF
position.
Load
DECK
2
with
a
test
tape
(Exampel:
TEAC
MTT-111N)
and
set
it
in
the
playback
mode.
Adjust
the
potentiometer
VR301,
so
that
the
output
frequen-
cy
becomes
3000Hz
+
10Hz.
High
Speed
Adjustment
.
Change
the
Dubbing
switch
and
High
Speed
switch
to
ON
position.
.
Check
frequency
counter
for
a
reading
of
5190Hz
+
520Hz.
If
it’s
not,
change
R368
(6.2k
0.
1/6W).
AM
ANTENNA
COIL
STRINGING
REPLACEMENT
OF
AM
ANTENNA
COIL
12
Wind
twice
the
enamel
lead
counterclockwise
on
to
the
boss
Aright
inside
of
the
cabinet
as
illustrated.
Wind
six
times
the
enamel
lead
clockwise
in
alphabetical
order
(A
—
B
—
C
—D)
without
slackening
as
illustrated.
Twist
four
times
the
beginning
and
termina!
of
leads
together
to
make
string
as
illustrated.
Shave
15mm
in
length
of
the
enamel
surface
of
both
leads
end
expose
the
copper
part.
Wind
the
antenna
coil
lead
on
to
the
AM
antenna
terminal
of
the
Loop
Antenna
Terminal
P.C.Board
and
solder
it.
(Total
lengh
3620mm)

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