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JVC RC-828L User Manual

JVC RC-828L
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Amplifier
Alignment
FUNCTION
Switch
:
TAPE
Mode
Switches
Center
Position
(except
Biphonic
Processor
Alignment)
Note:
1.
Align
in
numerical
order.
2.
When
changing
the
play/record
head
align
all
items
from
1.
to
5.
3.
Set
the
slider
of
semi-fixed
variable
resistors
to
the
center
position,
when
replacing
them,
before
aligning.
1.
Azimuth
Alignment
a.
Connect
a
dual
channel
oscilloscope
to
the
output
terminals
of
DIN
socket.
b.
Playback
the
reference
tape
(10kHz,
25mM/mm,
-15dB).
c.
Adjust
the
head
azimuth
so
that
the
output
signals
of
left
and
right
channels
become
maximum
and
in
phase.
Note:
If
the
head
cover
is
removed,
the
azimuth
align-
ment
can
be
done
though
the
mechanism
has
been
mounted
in
the
cabinet.
As
for
removing
the
head
cover,
refer
to
page
7.
2.
Playback
Level
Alignment
a.
Connect
a
V.T.V.M.
to
the
output
terminals
of
DIN
socket.
b.
Playback
the
reference
tape
(1kHz,
16mM/mm).
c.
Adjust
R168
(left
channel)
and
R268
(right
channel)
so
that
the
output
becomes
0.6V.
3.
Recording
Level
Alignment
a.
Remove
the
solder
on
the
part
(A)
of
copper
side
to
open
circuit
as
shown
in
Fig.
28.
b.
Set
the
TAPE
switch
to
NORMAL,
REC
switch
to
MANUAL
and
REC
LEVEL
controls
to
MAX.
in
the
recording
mode.
c.
Connect
the
V.T.V.M.
across
R108
(left)
and
R208
(right).
Fig.
28
=4T=
|
RC-828L/LB
d.
Supply
the
signal
(1kHz,
—6OdBs)
to
the
input
terminals
of
DIN
socket.
Note:
Do
not
supply
the
signal
to
both
channels
at
once.
e.
Adjust
R131
(left)
and
R231
(right)
so
that
the
voltage
becomes
0.7mV
(70uA/10Q).
.
Level
Meter
Alignment
a.
Follow
the
items
a.
&
b.
of
“Recording
Level
Alignment’’.
b.
Supply
the
signal
(1kHz,
-60dBs)
to
both
input
terminals
of
DIN
socket.
c.
Adjust
the
R145
so
that
the
teft
and
right
level
meters
deflect
to
the
same
level.
d.
Solder
the
part
(A).
.
Bias
Alignment
a.
Set
the
BEAT
cut
switch
to
the
lower
position.
b.
Connect
the
V.T.V.M.
and
frequency
counter
across
R108
and
R208.
c.
Adjust
L302
so
that
the
frequency
becomes
71kHz
in
the
recording
mode.
d.
Adjust
R166
(left)
and
R266
(right)
so
that
the
voltages
become
5.4mV
(540uA/10Q).
.
Biphonic
Processor
Alignment
a.
Set
the
MODE
switches
to
BIPHONIC
PROCESS
and
BINAURAL
>
BIPHONIC
position
and
set
the
TONE
controls
to
the
center
position
(click
stopped).
b.
Connect
a
dual
channel
V.T.V.M.
to
the
test
points
TP103
(left)
and
TP203
(right).
c.
Supply
the
signal
(125Hz,
-70
dBs)
to
the
left
input
terminal
of
DIN
socket.
d.
Adjust
R159
so
that
the
right
channel
output
is
less
than
left
channel
output
by
2.5dB.
e.
After
left
channel
alignment,
supply
the
signal
to
the
right
input
terminal
of
DIN
socket
and
adjust
R259
as
the
same
steps
as
R159.
“Left
Output
Left
Input
Cc
|
ai
Earth
Right
Input
Left
Output
Fig.
29
No.
1344

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JVC RC-828L Specifications

General IconGeneral
BrandJVC
ModelRC-828L
CategoryCassette Player
LanguageEnglish

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