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Fisher CR-5125 - Page 11

Fisher CR-5125
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ELECTRICAL
ADJUSTMENTS
(Continued)
9.
While
the
10
kHz
test
tape
is
being
played
back
again,
check
to
see
that
the
phase
difference
of
the
Right
and
Left
channels
is
#90°
on
the
synchroscope.
A.
While
the
test
tape
is
playing,
turn
the
azimuth
adjusting
screw
until
the
waveforms
of
the
Right
and
Left
channels
are
superimposed.
Adjustment
y~
Combination
Head
B.
If
not,
replace
the
Pinch
Roller
of
the
take-up
side
wit
AMPLIFIER
GAIN
ADJUSTMENT
h
the
other
one
and
perform
the
adjustment
from
Item
6.
10.
After
the
adjustment,
secure
the
azimuth
adjusting
screw
with
paint
or
glue.
AT
LEFT
CHANNEL
Connect
an
audio
signal
generator
and
an
attenuator
to
the
jeft
channel
LINE
IN,
a
VTVM
to
the
test
point
(TP101),
and
a
VTVM
to
the
left
channel
LINE
OUT
as
illustrated.
Audio
Signal
Generator
TINE
IN
RECORD
Attenuator
200mvV
(—14
dB)
VTVM
(580
mV)
Dummy
Load
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.
Adjust
the
left
channel
INPUT
Level
Control
until
the
output
level
on
the
test
point
(TP101)
becomes
580
mV
on
the
VTVM.

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