JVC KD-2A User Manual

KD-2A/B/C/E/J/U
Mechanical Adjustment
Height of E head
Head position
check
Procedure
Part
Rating
Remarks
REC/PB
head
1.
Connect
the
milivolt
meter
to
.
If
either
of
the
REC/PB
head
azimuth
inclina-
LINE
OUT
jacks.
(or
REC/PB
show
low
performance
be-
socket)
cause
of
wear,
broken
wire
or
2.
Playback
the
reference
tape
VTT-
oxcessive
magnetization,
it
658
(10kHz).
should
be
replaced,
and
then
3.
Turn
the
screw
B
so
that
mili-
you
must
adjust
the
head
volt
meter
indicate
maximum
azimuth,
playback
sensitivity,
(output
level
become
max.)
REC
bias
current,
and
REC/PB
4.
After
adjustment,
the
screw
Screw
B
Max.
level
(see
electrical
adjust-
ment.)
2. If Land R channel levels of
head become unbalance 3~4
dB or more, you should be
replaced the head.
B should be locked with a
bond.
When replace the E head, must
be adjusted this method.
Playback the test tape C-120 (front
cutted cassette) and turn the screw
D so that the tape may run in the
center of the guide.
1. If the tape touch the upper
guide, loose the screw D
~<——- Tape guide (upper side)
— Tape
2. If the tape touch the low guide,
fasten the screw D
Sg Tape
~=«—— Tape guide (low side)
After adjustment, the screw D
should be locked with a bond.
Check the head position by the gaze.
The clearance is 0.7mm or less
between the head and the gaze.
. Check with your own eyes.
2. If not, high frequency range
or erase ratio will be down.
0.7 mm
or less
Motor speed
3000Hz
42%
(2940~
3060Hz)
. Motor current is 100mA at
playback.
2. If the wow flutter meter
built-in the counter meter,
connect it’s INPUT jacks.
1. Connect the counter meter to
the LINE OUT jacks.
2. Playback reference tape VTT-
656 (3000H2z).
3. Adjust the semi-fixed resistor on
the motor circuit board so that
the speed is 3000Hz+2%
Take-up torque
(if not)
1. Clean the main belt, rubber
rim of idler and rubber rim of
the Take up disc.
2. Replace the idler arm of the
take-up and spring.
Measure by the torque measure
cassette or the torque gaze tool
at the playback mode.
Fast forward
torque
(If not)
1. Clean the main belt, rubber
rim of the idler, motor pulley
rim of the flywheel.
2. Replace the main belt, idler,
and reel disc ass’y.
70 gr-cm
or more
Measure as same way at FF mode.
No. 4151

JVC KD-2A Specifications

General

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