Technics RS-676US

SUBJECT:
Corrections
of
RS-676US
Service
Manual
Item
Error
Correction
Head Azimuth
Measure both channels, ...
... by adjusting.
Measure both channels, and
adjust levels for equal output.
Overall Frequency
Response
0.042 V
Overall Frequency
Response
4kHz 6kHz 8kHz 10kHz 12kHz
Fig. 28
4kHz 6kHz 8kHz1OkHz 12kHz
Fig. 28
Dolby FM
Dolby FM
De-Emphasis
Note
Note
Test equipment connection is
shown in fig. 22.
... greater ...
Place UNIT into record mode.
Back side.
Close when cassette with
knob out tub in.
Test equipment connection is
shown in fig. 22, but input
jack should be TUNER IN,
instead of LINE IN.
.. smaller ...
Release the record mode.
Bottom side.
Closed when cassette with
knock out tab in.
Schematic
Diagram
De-Emphasis
Characteristic
on
page
18
(Correct)
Make
the
correct
measurement
as
follows.
1.
Test
equipment
connection
is
the
same
as
above.
2. Release the record mode.
3.
Set
the
Dolby
FM
switch
to
IN
position
and
FM
CAL
VR,
VR21
(L-CH),
VR22
(R-CH)
to
maximum.
4.
Set
the
de-emphasis
switch
to
CONVENTIONAL
position
and
Dolby
NR
switch
to
OUT
position.
5.
Supply
100
Hz
signal
to
TUNER
IN
and
adjust
ATT
so
that
output
level
at
LINE
OUT
becomes
580
mV.
6.
Change
the
frequency
to
10
kHz
and
check
the
output
level
is
about
580
mV.
7.
Change
the
de-emphasis
switch
to
25s
position
and
confirm
that
the
value
at
LINE
OUT
ts
3
dB+1
greater
than
the
value
for
75ys
position.