JVC KD-2A User Manual

KD-2A/B/C/E/J/U
Main Adjustments
Electrical Adjustment
Equipment
and
measuring
instruments
used
for
adjustment.
AUDIO
Freq.
OSC
1.
V.T.V.M,
(measuring
AC
in
millivolt)
Se
—o
ATTENUATOR
2.
Audio-frequency
oscillator
\
Sy
%
aa
(range:
50—20kHz
and
output
OdBs
with
impedance
6002
)
i
-
&
ASS
dA,
‘|e
3
600
3.
Attenuator
(6002
)
i
LG
oun)
4.
Reference
tapes
for
REC/PB
Il
"
pre
TS-1
(OP-12,
C521V)
—
normal
tape
Nap
eel
<a
TS-2
(TP-18,
C402R)
—
chrome
tape
ouTaUT
LINE
a
LINE
OUT
5. Reference tapes for playback
VTT-658 (for head adzimuth)
VTT-656 (for tape speed & wow flutter)
VTT-664 (1kHz reference level)
VTT-675N (for playback frequency response)
6. Resistors
1002 (for measurement of the bias current)
6002 (for attenuator matching)
7. Distortion Meter, Band pass filter
When
you
adjust
following
items,
we
recommend
to
you
to
keep
doing
step
No.
1. Electrical Adjustment
Playback
1.
Level
meter
.
Set
the
deck
to
the
record
mode.
|
Main
amp
The
angle
of
meter
deflection
has
deflection
;
Input
1kHz
signal
(about
10dBs)
|
circuit
board
been
factory-adjusted,
but
should
from
LINE
IN
jacks.
be
adjusted
when
parts
are
.
Adjust the
REC volume
so
that
replaced.
LINE OUT
become
3.5dBs.
.
Adjust
R148
and
R248
in this R148,
248
VU
meter
condition
it
obtain
zero
VU
(METER)
range;
O
meter
reading
.
Playback
.
Set
equalizer
switch
at
Main
amp
.
Should
be
adjusted
playback
sensitivity
“NORMAL”
position
and
turn
circuit
board
sensitivity
when
heads
are
off
ANRS
switch.
replaced.
. Adjust R126 and R226 so that R126, 226 VU meter | 2. Make this adjustment after
level meters indicate zero VU (P.B LEVEL) range; 0 making sure level meter deflec-
using reference tape VTT-664 tion angle is correct.
(1kHz)
.
Check
of
PB
Playback
the
reference
tape
VTT-
i
.
When
use
reference
tape
VTT-
frequency
675N
(1kHz)
and
check
the
OUT
675,
it’s
level
over
about
3~4
response
PUT
level
of
bach
frequency
to
Reference
frequency;
1kHz
dB
at
63Hz
compared
with
become the rating. Normal 63Hz +2dBt3dB 1kHz.
10kHz O +3dB/ 2, When check at chrome it’s
Chrome 63Hz +2dB+3dB level, set the equalizer switch
10kHz ~-4dB+3dB at “NORMAL” position to
compared with 1kHz.
Record/playback
TS-1
use
at
normal
mode
and
TS-2
use
at
chrome
mode.
1.
Check
of
REC/
|
Input
1kHz
(OVU-20dB)
signal
Reference
frequency;
1kHz
j
Do
adjust
normal
and
chrome,
from LINE IN make recording the
PB
frequency
blank
tape,
and
then
record
50Hz,
Normal
50Hz
O+3dB
|
Lchannel
and
R
channel.
response 10kHz signals. 10kHz O0+3dB
When it’s Ape playback, 50Hz or Chrome 50Hz 0+3dB
10kHz output level become in ratin
at comparison 1KHz output level ae. 1OkHz O+3dB
the reference frequency.
(As basic thought, 1KHz, 50Hz and
10KHz output level become the flat
frequency responce as same.)
No. 4151 22°8, =

JVC KD-2A Specifications

General

Brand	JVC
Model	KD-2A
Category	Cassette Player
Language	English