JVC KD-A11 - Page 13

KD-A11A/B/C/E/J/U
{ Adjusting | Standard
point value
Checking
.
Record
a1
kHz,
0
VU
signal.
Normal
tape;
Apply
an
output
(—20.5
dBs)
to
the
signal
to
Stop
the
input
by
disconnecting
from
More
than
42
dB
|
DIN
IN
terminals
with
the
recording
noise
ratio
the
terminal
to
perform
non-signal
re-
Chrome
tape;
level
controls
set
to
maximum
so
recording/
cording.
More
than
42
dB
|
that
the
VU
meter
becomes
to
0.
playback
.
Playback
the
recorded
part.
Metal
tape;
Measure the 0 VU recording output More than 42 dB
and the non-signal recording output
for comparison using an electronic
voltmeter.
Check to see if the value conforms to
the standard value.
Checking
.
Apply
a!
kHz
signal
to
the
DIN
IN
For
the
measuring,
connect
a
band
erasing
co-
terminals.
pass
filter
between
the
deck
and
the
efficient
Adjust
the
recording
level
controls
un-
electronic
voltmeter.
tit
the
VU
meter
becomes
to
0.
tapat
Tape
deck
Erase
a
part
of
the
recording.
(1
kHz
0
VU)
(recording,
: erasing)
Measure
the
output
difference
between
=
{
the
erased
part
and
non-erased
part
to
compare
with
an electronic
voltmeter.
filter
voltmeter
Integrant
Circuit
[IC for Meter & HP Amp.]
(
UPC4557C
Top
View
Equivalent
circuit
(%4)
[IC FOR Dolby NR Circuit]
Top View
input [16] ve
pore
ee
ee
ee
eee
LL
t
input By Pass Lis
4
Output By Pass 62
'
'
Reference NIC '
t
'
input Input ! 5 AMP
!'
Output Output { 6
Li——~6~—
—~~95~-~4--632~—
~—~§4.~-46.-6-
6
( Output By Pass
NIC [3] Ground
—13— No. 4192