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Fisher CR-5125 - Page 15

Fisher CR-5125
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REMOTE
CONTROL
ADJUSTMENT
RECEIVED
FREQUENCY
ADJUSTMENT
Synchroscope
1.
Pull
out
the
two
connectors
(CN18
and
CN19)
from
the
sine
wave
(Max.)
Control
Amplifier
P.C.Board.
2.
Connect
an
audio
signal
generator,
a
SCA
signal
generator,
and
an
attenuator
to
the
connector
pins
(CN18
and
CN19)
and
then,
connect
a
VTVM
and
a
synchroscope
across
Resistor
R515
on
the
Control
Amplifier
P.C.Board
as
illustrated.
Attenuator
1
mV
(—60
dB)
be)
Se
CN18
SCA
Signal
Generator
>
‘
38
kHz,
Deviation
+1
kHz
CN19
7
L823
}
Audio
Signal
Generator
570
Hz
E
ope
3.
Modulate
the
signal
of
570
Hz
produced
from
the
audio
signal
generator
at
38
kHz,
deviation
+1
kHz
in
the
SCA
signal
generator.
4.
Feed
the
modulated
signal
at
1mV(—60dB)
to
the
connector
pin
(CN18)
with
the
unit
in
the
playback
mode.
5.
Turn
the
cores
of
the
transformers
(T501
and
T502)
with
an
Synchroscope
alignment
tool
until
the
signal
sine
wave
becomes
the
sinewave:
(Max:)
maximum
at
peak-to-peak
on
the
synchroscope.
6.
Connect
the
VTVM
to
the
Pin
No.
5
of
C501
as
illustrated.
Then,
adjust
the
potentiometer
(P501)
until
the
VTVM
reading
becomes
the
maximum
while
feeding
the
modulated
signal
to
the
connector
pin
(CN18)
with
the
unit
in
the
playback
mode.
Attenuator
c—__
1
mV
(—60
cB)
ea
=
=
CN18
SCA
Signal
Generator
38
kHz,
Deviation
+1
kHz
CN19
i
é ‘
ta
Audio
Signal
:
|@s
Generator
570
Hz
:
:
ote
ewe
—15—

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