Technics QUARTZ SL-MA1 - Page 9

| Adiustment Procedure
Adjustment of clock frequency
1.
Short-circuit
the
I1C401
side
of
R412
~
R415
and
connect
it
to
the
jumper
(+5V)
near
1C401
pin
40
(or
short
circuit
1C401
pins
14
~
17,
and
connect
it
to
pin
39).
2.
Connect
the
oscilloscope
to
the
anode
side
of
D401
(or
1C401
pin
4).
3. Turn the power switch on.
4.
Adjust
VR401
so
that
the
period
of
waveform
is
30
+
lusec.
Set
Anode of
Ground 401
Oscilloscope
VOLT....... iV
SWEEP...... 10us.
INPUT...... Dc
e Waveform
wets §=T=304 Tpsec.
Tele |
Adjustment
of
offset
voltage
1.
Connect
the
DC
voltmeter
or
oscilloscope
to
TP201
and
the
plus
(+)
side
of
C203
(or
connect
it
to
1C301
pins
1
and
8).
.
Turn
the
power
switch
on.
3.
Adjust
VR201
so
that
DC
voltage
is
0
+
20
mV.
If
the
voltage
fluctuates,
adjust
it
to
minimize
the
fluctuation.
Note:
Put
the
set
on
a
horizontal
table
and
clamp
the
arm
when
making
the
adjustment.
N
Adjustment of arm lift height
The
arm-lift
height
(distance
between
the
stylus
tip
and
the
record
surface
when
the
tonearm
is
at
the
“’
W
”
position)
has
been
adjusted
at
the
factory
to
approximately
5
to
7mm
(3/16"
~
9/32").
If
the
clearance
is
too
narrow
or
too
wide,
turn
the
adjust-
ment
screw
clockwise
or
counterclockwise.
Clockwise rotation
—distance
between
the
record
and
stylus
tip
is
decreased.
Counterclockwise
rotation
—distance
between
the
record
and
stylus
tip
is
increased.
=
DC voltmeter
Repair table
Adjustment
screw
Adjustment of auto start position
If
the
stylus
does
not
land
in
the
lead-in
groove,
adjust
as
follows.
1. Clamp the tonearm to the arm rest.
2, Remove the rubber cap.
3.
Turn
the
auto-start
adjustment
screw
with
a
screwdriver,
clockwise
or
counterclockwise
as
necessary.
If
the
stylus
tip
sets
down
too
far
in
the
recorded
groove,
—turn counterclockwise.
If
the
stylus
tip
sets
down
outside
of
the
record,
—turn clockwise.
Adjust
so
the
stylus
tip
lands
1
~
2
mm
in
from
the
edge
of the record.
Si
Auto-start adjustment
Rubber cap
crew