Luxman PD-121 User manual

SERVICE MANUAL

MODEL: PD-121,131
Features of Black light by using a small
Cold Cathode Ultra violet light tube
This small discharge type tube was developed for use in our turntable. As its features far out
weighed that of the conventional Orange Neon as strobo~scope timing light.
It differs in operation from the usual fluorecent tube in that it has no starting filaments, but
instead has a small electrode near each main cathode at each end of the tube. So discharge is
enabled by a high firing voltage (250 volts).
However, since mercury is used as the gaseous medium in the sealed tube operation at very low
temperatures eg. below 5°C is very difficult. But with the special firing circuits used in the
PD-121, operation is guaranteed from above 0°C.
This tube is characterized by
1) Low power consumption (0.7W)
2) Low operating temperature
3) Smali-size
4) Long-life (20,000 hours)
5) Ultra Violet light at 3650 ik
So to make the strobo-scope pattern very clear as if to appear stationary, the tube is fired by
short duration pulses, and to make for a high visibility "dayglo” type paint is used for the strobo
markings, this type of paint converts Ultra violet light into visible coloured light.
MAIN MAIN
ALIGNMENT PROCEDURE
1) PB-650 D.C. voltage adjust
13.5 0.5 - PD121
| WE OSV -PD131
~ YAL-VOL

Re
2)
3)
Pre-adjust of the Turntable position
a)
b)
c)
After
mounted
every
components
on
both
the
chassis
and
the
panel,
these
two
shall
be
put together.
Loosen
the
4
screws
for
provisional
fixing,
and
put
the
turntable
on.
Provisionally
fix
the
motor
when
the
equivalent
gap
between
the
panel
and
the
turntable
is
obtained
as
per
the
drawing.
(The
provisional
fixing
is
possible
with
a
(+)
driver
through
the
2
holes
for
tightening
of
the
motor-fixing
(-)
screw
on
the
turntable.)
Poo:
Gap
Turntable
Hole for tighting of the
Motor-fixing screw
Pre-adjust
of
the
Reed
Switch
and
the
height
of
the
Selector
Switch
a)
b)
c)
d)
e)
f£)
Hold
the
switch-button
on
the
panel
with
the
SCOTCH
drafting
tape
etc,
and
put
together
with
the
chassis.
Note
that
the
chassis
and
the
wood-frame
should
not
be
screwed together at this stage.
Adjust
the
screw
which
fixes
the
switch-mount
metal
so
that
the
button
protrudes
about
2mm from the panel-surface.
Power-on
with
the
mains
cord
connected
to
the
rated
AC
mains
power
source.
4
Operate
the
speed
selector
switch
to
check
through
the
stroboscope
whether
smooth
speed-selection
is
possible.
(In
case
correct
rotation
is
realized,
the
figures
in
the
stroboscope are observed standstill.)
When
the
above
selection
is
found
to
be
not
smooth,
re-check
its
operation
by
varying
the
position
of
the
switch-mount
metal,
which
is
stated
in
the
(b)
clause.
Further,
when
the
operation
checked
in
(e)
is
found
unstable,
check
again
with
moving
the
Reed Switch as per the drawing.
Kas
Reed Switch
PB-652
SCOTCH drafting tape
a
i Panel
Li
OFF ON

oh eR HERP SRE LEIS LIT TE TSE ETRE LEDER EE
FINAL ADJUST
2)
3)
4)
5)
Setting of the platter
After
fixing
the
wood-frame
and
the
chassis
together
with
screws,
the
final
check
shall
be
made
in
the
same
procedure
as
stated
in
the
section
(2)
pre-adjust.
Switch-button Height
Same
procedure
as
made
in
the
(3)
-
(b)
pre-adjust.
Adjust
the
2
screws
for the
switch-mount
metal
at
the
bottom
side
of
the
chassis
to
obtain
2mm-protrusion
from
the
surface
of
the
panel.
Speed-Selection
Ascertain
the
firm
selection
of
speeds
by
operating
the
selector.
When
it
is
unstable,
adjust
the
2
screws
for
the
switch-mount
metal.
In
case
the
section
(2)
is
not
fulfilled
is
(the
buttons
do
not
protrude
from
the
panel,
or
the
protrusion
is
extremely
different
on
the
ON-
button
and
OFF-button),
repeat
the
pre-adjust
section
(3).
Hinge-Height
Adjustment
Set
the
acrylic
cover
to
the
hinge,
and
adjust
as
per
the
drawing.
Sponge Dampar Hinge
ie doe Woot flame sd
Installation of the Tonearm Base
Install
the
base
to
the
chassis.
Turn
the
base
to
the
clock-wise
direction
by
1/8
rotation
until
it is
locked,
when
ascertain
that
the
base
is
firmly
locked.
Then
press-in
the
lock-release
button
and
turn
the
base
to
the
counter-clockwise
direction
to
remove
the
base.
Try this procedure 2 or 3 times.
as

onan na en AP EON A TEI YS
BLOCK DIAGRAM
SPEED ADJUST
BLACK LIGHT
DRIVER FOR BLACK LIGHT
B.D. MOTOR
POWER SW. POWER TRANSFOMER
AVR. SECTION
ELECTRODE OF BLACK-LIGHT
MAIN SUB = SUB’ MAIN
CIRCUIT DIAGRAM FOR BLACK-LIGHT
R204
1.8K 12H
6201 350V 4.7
R205 47K ZW OOS
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230V AC
120¥ AC
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6205 2200P
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D202
TRANS SECONDARY
3K NUMBERS ARE EQUIVALENT TO THE SOCKET NUMBERS.

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1A (PD131)
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(
403)
680
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1N4003
(D401)
680
(
405)
102
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(D402)
10K
(
406)
103
W-04
€
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(
407)
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(
404)
10K-B
(VR401)
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(
405)
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(
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280945
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