JVC TD-W717TN - Electrical Adjustment Details; Input Sensitivity and REC;PB Response Checks; Recording Sensitivity, Output, and Distortion Checks; Signal-to-Noise Ratio Check

TD
-
W
717
TNC
/
J
TD
-
W
718
BKA
/
B
/
E
/
EN
/
G
/
U
/
UT
Adjustment
and
Confirmation
Standard
Adjusting
Conditions
Item
LINE
IN
:
-
20
dBs
±
2
d B
MIC
:
-
66
dBs
±
3
dB
1
.
Supply
a
1
kHz
signal
to
the
LINE IN
terminals
at
-
20
dBs
,
confirm
that
LINE
OUT
level is
-
8
dBs
.
2
.
Supply
a
1
kHz
signal
to
the
MIC
input
termi
-
nals
at
”
66
dBs
,
confirm
that
LINE
OUT
level
is
-
8
dB
$
.
3
.
Confirm
that
difference
level
between
left
and
right
within
2
dB
at
LINE
IN
terminals
and
within
3
dB
at
MIC
terminals
.
6
Input
sensitivity
level
check
*
7
REC /
PB
frequency
response
check
LINE
INPUT
LEVEL
:
Ref
.
-
20
dB
(
-
40
dBs
±
2
dB
)
MIC
INPUT
level
:
Ref
.
-
20
dB
(
-
86
dBs
±
3
dB
)
NR
SWITCH
:
OFF
This
step
must
be
performed
after
the slave
oscillation
adjustment
.
Record the
1
kHz
and
12.5
kHz
signals
at
the
level
of
-
20
dB
(
20
dB lower than the
reference
level
)
.
Playing
back the
recorded
signals
,
check that the
level
of
the
12.5
kHz
signal
is
0
±
2
dB
to
the
level
of
the
1
kHz
signal
.
12.5
kHz
level
:
0
±
2
dB
higher
.
than
the
1
kHz
level
.
Increase
In
high
frequencies
CQ
Low
bias
current
Q
)
C /
>
C
o
Appropriate
bias
current
High
bias
current
Frequencies
a
.
Decrease
in
high
frequencies
'
'
-
ta
O
)
DC
0 50
Hz
1
kHz
12.5
kHz
1
.
Supply
a
400
Hz
signal
to
the
LINE
IN
termi
-
nals
record
a
400
Hz
signal
at
reference
level
of
-
20
dB
.
2
.
Confirm
that
REC
indicator
should
turn
on
when
LINE
OUT
level is
-
28
dBs
during
re
-
cording
.
Normal
,
Chrome
,
Metal
:
“
28
dBs
±
1
dB
8
Recording
/
playback
sensitivity
check
LINE
OUT
:
more
than
5
dBs
PHONES
OUT
:
more
than
-
16
dBs
Suply
1
kHz
signal
to
the
LINE IN
terminal
in
the
Rec
.
monitoring
mode
,
and read
non
-
clipped
signal
level
at
the
LINE IN
terminal
.
9
Maximum
out
put
check
\
Nornal
:
Less
than
2
%
Cr
02
/
Metal
:
Less than
3
%
10
Checking
record
/
playback
distortion
1
)
Record
a
1
kHz
,
-
20
dBs
signal
to
LINE
IN
terminals
.
2
)
Play
back
the
recorded
part
,
Check
the
output
with
a
distortion
meter to
see
if
the
value
conforms
to
the standard value
.
1
)
Record
at
1
kHz
,
-
20
dBs
signal
,
Stop
the
in
-
put
by disconnecting
from
the terminal
to
perform
non
-
signal recording
.
2
)
Play
back the recorded
part
.
Measure
the
-
8
dBs
recording
output
and the
non
-
signal
recording
output
for
comparison
using
an
electronic voltmeter
.
Check
to
see
if
the value
conforms
to
the
standard
value
.
11
Checking
signal
to
noise
ratio
recording
playback
Normal
,
More
than
40
dB
Metal
,
chrome
;
More than
41
dB
(
No
.
4358
)
21