Technics RS-676US

How
to
Measure
&
Adjust
Overall
Gain
for
CrO2
After
“Overall
Gain
Adjustment’
for
Normal
Tape
adjust
it
for
CrOz
as
follows.
_
Test
equipment
connection
is
shown
in
fig.
23
(Test
tape:
C-RF).
. Place the unit into record mode.
_ Set the tape select switch to CrO2 position.
_
Supply
1
kHz
signal
(—24
dB)
from
AF
oscillator,
through
ATT
to
LINE.
IN.
Set
the
record
level
volume
control
to
maximum.
_
Adjust
ATT
until
monitor
level
at
LINE
OUT
becomes
0.42
V
(—7
dB).
. Make recording mode.
_
Playback
recorded
tape,
and
make
sure
the
value
at
LINE
OUT
on
VTVM
becomes
0.42
V
(—7
dB)+1
cB.
9. Make short circuit as follow.
ONanoRWDYHE
Close the Circuit Point — .
When Measured Value is — .
0.35V~0.37V
:
A
0.3V~0.34V
10. Repeat from step (2).
NOTE:
in
case
that
overall
gain
is
out
of
standard
during
CrOz
mode
with
the
old
type
set,
change
the
resistors
as
follows.
Old Type
When
Measured
Value
is
—
.
Change
the
Resistors
—
.
Less
than
0.37
V
R77,
78
to
less
than
1.5KQ
0.328
~
0.46
V
Not
meed
More
than
0.47
V
R77,
78
to
more
than
1.5KQ
REMARKS:
Adding
220Q
cause
a
reduction
by
0.5
dB.
G.
Change
of
Audio
Amplifier
Circuit
(2)
REASON:
CR
constant
of
recording
equalizer
is
changed
for
further
improvement
of
high
frequency
range.
MODIFICATION:
pessintien
Part
No.
escription
i
Former
|
Remarks
New
Mylar Capacitor
ECQM0556 3KZ
ECQM05393KZ
ECQM05393KZ
ECQM05273KZ
Styrol Capacitor
ECQM05103KZ
ECQS14715Z
Mylar Capacitor
ECQM05332KZ
ECQM05272KZ
Carbon Resistor
ERD14VJ681
ERD14VJ153