JVC UX-A4 - Cassette mechanism part

1. Thrust gap
flywheel
2. Mecha
operation
3. Signal of
auto stop
4. Leaf
switch
position
s—1,
Azimuth
5-2
Guide height
s-3.
Tape running
$—4.
Stertching
—s§
Head
Position
@ Cassette mechanism part
Mecha control
Mecha control
M306 gauge
t=3.4mm chip
VVT 704(12.5KHz}
Upper side curling
of FWD, lower side
curling of REY.
Lower side curing of
FWD, upper side
curling of REV
IN PLAY
A 3.10-3.65mm
(3.25~3.80}
IN MS
A 44-5.1mm
(1.8~2.5)
Check with finger feeling.
Following operation to be norntal (Both FWD,
REV) and, in that time, noise, vibration should
not occur.
(Running
noise
during
PLAY,
FF,
REW,
is
accepted
if
noise
can’t
be
heard
with
loading
cassette
type.)
Lead light to be and off normally piay (SIG)
(Caution: Without tape fwd side only, led to be
on and off.)
1. All switch lads, should light when putting
cassette gauge for confirming leaf SW on.
2. All SW feds should not light when putting
cassette gauge for confirming leaf SW off.
Adjust azimuth to the peak point by play back
12.SKHz.
At that time, difference Lch— Reh below 4dB and
difference Lch— Ach FWD/REV below 3cB.
t=3.4mm chip can be inserted into guide of R/P
head after adjusting azimuth.(t=3.4mm chip can
after be inserted into dummy guide, both FWD,
REV.)
Curl running should not occur at guide of A/P
head with loading C~90 at midle.(Both FWD,
REV)
Curling at oposite of gap is corrected by turning
azimuth screw within 4% tuma can be
acceptable.(After checking above item azimuth
acrew to be returned to previous position.)
Curling at gap side is corrected by turning
azimuth screw within 4 tums can be acceptable
{After checking above item, azimuth screw to be
returned to be returned to previous position.)
Stretching not to occur at the beginning of C—90.
(Without pad)
<
Reversing L and R crass taik not to occur by
play back 1KHz.
(FF, REW),
PAUSE, STOP
Sampling
check
UX-A4 B/E/G/GI/EN
MECHA CONTROL
Head position jig.
Figuires in { )is
against standard
cassette guide
Mecha control OSC
scope
VVT 752
(No. 1890) 45