Technics SL-P250 User manual

ORDER NO. HAD8803055C0
ervice
Manual
Compact Disc Player
SL-P250
(K) ween USA,
(K) Canada.
(K) (S) Continental
Europe.
United Kingdom.
COMPACT
[DIGITAL |
DIGITAL AUDIO
(K) (S) | (EK)
(K) (XL) Australia.
(K) (S) | (EG)....... F.R. Germany.
(K) (S) Belgium.
(K) (S) Holland.
(K) (S) France.
(K) (S) | (Ei) Italy.
(K) (XA) Asia, Latin
America, Middle
Near East, Africa
and Oceania.
Saudi Arabia.
Far East PX.
European Military.
Color
European
Audio
Club.
(K)...Black Type
SPECIFICATIONS
i Audio i Infrared remote-control transmitter
61x19 x 165mm
No. of channels
Frequency response
Output voltage
Dynamic range
SIN ratio
Harmonic distortion
Total harmonic distortion
Wow and flutter
Output impedance
Load impedance
Headphone output level
D-A conversion system
@ Signal Format
Sampling frequency
D-A conversion
@ Pickup
Wavelength
2 (left and right stereo)
2~20,000Hz+0.5dB
2V (at OdB)
94dB
96dB
0.003% (1kHz, 0dB)
0.006% (1kHz, 0dB)
Below measurable limit
Approx. 600Q
More than 10kQ
15mW max. 32Q (adjustable)
2 DAC System with
16-bit Resolution
44.1kHz
16-bit linear
780nm
Dimensions (W x H x D) :
(2-13/32” x3/4” x 6-1/2")
Batteries UM-4 “AAA” batteries or 1EC R03
or equivaknt (1.5V x 2)
Weight 105g (3.7 oz.) (including batteries)
i General
Power supply For U.S.A. and Canada. : AC12OV, 60Hz
For United Kingdom and Australia: AC24OV, 50Hz
For Continental Europe: AC22OV, 50Hz
For Others: AC 110V/127V/220 V/24V, 50/60Hz
Power consumption For U.S.A. and Canada: 13W
For )thers: 11W
Dimensions (W x H x D) 430 x 7).8 >< 247mm
(16-15/16" x 3-5/37 x 9-23/32")
Weight 31kg (6.8 Ib.)
Specifications are subject to change without notice.
Weight and dimensions shown are approximae.
Matsushita Electr: Tras ding Co., Ltd.
Matsushita Services Company Panasonic Hawaii, Inc.
50 Meadowland Parkway, 91-238, Kauhi St. Ewa Beach P.O. Box 288, Cerral Csaka Japan
Secaucus, New Jersey 07094 P.O. Box 774
Honolulu, Hawaii 96808-0774 Panasonic Tokyo iffice?
Matsushita Elecir; tras ding Co., Ltd.
Division of Matsushita Electric Matsushita Electric 6th Floor, world Tade Center Bidg.,
of Puerto Rico, Inc. of Canada Limited No. 4-1, HarmamMatu-ct» o 2-Chome,
Ave. 65 De Infanteria, Km.9.7 5770 Ambler Drive, Mississauga, Minato-ku, Tokyo 05, sapan
Victoria Industrial Park Ontario, L4W 2T3
Carolina, Puerto Rico 00630
Panasonic Sales Company,
Technics

SL-P250
Mi CONTENTS
Page
Page
SAFETY
PRECAUTIONS
............0.2200ccucceccecucsees
2
PRINTED
CIRCUIT
BOARD
AND
PRECAUTION
OF
LASER
DIODE
...............0.ccceeee>
3
WIRING
CONNECTION
DIAGRAM
................:.
29
BEFORE
USING
THIS
UNIT
..............02-0ecneeeceeeee
3
PRINTED
CIRCUIT
BOARDS
.................0000005
30~34
CONNECTIONS
........2.-
ccc
cce
cece
cee
ceeceenecencauenes
4
BLOCK
DIAGRAM
...............ccccccceccuccercucs
35~37
CONCERNING
COMPACT
DISCS.
...................
aah
nie
ne
4
REMOTE-CONTROL
UNIT
PARTS
.............ccecceeees
38
FRONT
PANEL
CONTROLS
AND
FUNCTIONS.
..........
5,6
SCHEMATIC
DIAGRAM
OF
REMOTE-CONTROL
TRANSMITTER
............2.0.e0e008
7
REMOTE-CONTROL
TRANSMITTER
................-
39
HANDLING
PRECAUTIONS
FOR
OPTICAL
PICKUP
.......
8
INTERNAL
CONNECTION
OF
FL
..............20c0ccecee
40
INSTRUCTIONS
FOR THE
SZZOL31............2..cceeeaee
8
TERMINAL
GUIDE
OF
IC’S,
DISASSEMBLY
INSTRUCTIONS
................0.0005
9~12
TRANSISTORS
AND
DIODES
........
Sea
deena
40
MEASUREMENTS
AND
ADJUSTMENTS
.............
13~18
SCHEMATIC
DIAGRAM
...........0..cccccceccaccees
41~46
TERMINAL
FUNCTION
OF
LSI
...............2.00005
19~23
REPLACEMENT
PARTS
LIST
(Mechanical
parts)
.........
47
REPLACEMENT
PARTS
LIST
(Electrical
parts)........
24,
25
EXPLODED
VIEWS
.............ccccecccececcacccans
48~50
PACKING
0550
isceleectde-cas
ove-seh
et
adisacleca
dee
eeeee
cdmaees
26
TROUBLESHOOTING
GUIDE
.................000000e
51~54
RESISTORS
AND
CAPACITORS
.............00cce00s
27,
28
@
SAFETY
PRECAUTION
atis
“safety
precautions”
is
applied
only
in
U.S.A.)
Before
servicing,
unplug
the
power
cord
to
prevent
an
electric
shock.
When
replacing
parts,
use
only
manufacturer’s
recommended
components
for
safety.
.
Check
the
condition
of
the
power
cord.
Replace
if
wear
or
damage
is
evident.
.
After
servicing,
be
sure
to
restore
the
lead
dress,
insulation
barriers,
insulation
papers,
shields,
etc.
.
Before
returning
the
serviced
equipment
to
the
customer,
be
sure
to
make
the
following
insulation
resistance
test
to
prevent
the
customer
from
being
exposed
to
a
shock
hazard.
e INSULATION RESISTANCE TEST
1.
Unplug
the
power
cord
and
short
the
two
prongs
of
the
plug
with
a
jumper
wire.
2. Turn on the power switch.
3.
Measure
the
resistance
value
with
ohmmeter
between
the
jumpered
AC
plug
and
each
exposed
meta!
cabinet
part,
such
as
screwheads
antenna,
contro!
shafts,
handle
brackets,
etc.
Equipment
with
antenna
terminals
should
read
between
3MQ
and
5.2MQ
to
all
exposed
parts.
(Fig.
A)
Equipment
without
antenna
terminals
should
read
approximately
infinity
to
all
exposed
parts.
(Fig.
B)
Note:
Some
exposed
parts
may
be
isolated
from
the
chassis
by
design.
These
will
read
infinity.
OfRON =
Antenna
terminal
Exposed Exposed
metal
metal
part
part
Ohmmeter
Ohmmeter
(Fig.
A)
(Fig.
B)
Resistance
=
3M2—5.2MQ
Resistance
=
Approx
oo
4.
lf
the
measurement
is
outside
the
specified
limits,
there
is
a
possibility
of
a
shock
hazard.
The
equiomnnt
should
be
repaired
and
rechecked
before
it
is
returned
to
the
customer.
*AC
power
supply
cord
....
1
Stereo
connection
cable...........
1
®Remote-control
eBatteies
-...-..
2
SJA175-1
(M)
(SJP2249-1)
transmitter
.....
1
pr
aera!
SJA172
(MC)
a
SJA187 (E, EB,
EH, EG, EF, Ei)
SJA173
(XL)
)
SFDACO5G02
(Ek)
SJA168
EUR64786
(M,
MC)
(XA,
PA, PE,
PC)
EUR64787
(others)......
Blaciverssion
SJA183
(XB)
EUR64792
(others)......
Silveverssion

Mi PRECAUTION OF LASER DIODE
Caution: This product utilizes a laser diode.
ADVARSEL: | dette a apparat anvendes laser.
® Use of caution labels
Note © Mark is used, X Mark is not used
[EK], [XL], (EG),
(EB), (EH), (EF,
(Ei), [XA}, [XB]
SQWD45
ADVARSEL -Usynligt
laserlys udstrales ved
Abning UNDGA DIREKTE
BESTRALING.
SQw010
DANGER- Invisible laser
radiation when open.
AVOID DIRECT EX—
POSURE TO BEAM.
saw045
"CAUTION-nazaroous Laser, ano
ELECTROMAGNETIC RADIATION WHEN OPEN”
"ATTENTION-ravonnement Laser Er
ELECTROMAGNETIOUE DANGEREUX SI OUVERT”
SQWD19
Mi
BEFORE
USING
THIS
UNIT
The optical pickup is secured to prevent damage during
transport. Be sure to release it before use.
(m) (MB)
Lock shaft
(in the locked
condition)
Pull to unlock.
Soft cloth or similar material
(to prevent scratches)
Caution:
Do not transport the unit without locking the lock shaft.
Severe damage will result.
If the unit is transported again, perform the following steps:
1) Remove the disc from the tray and turn off the power.
2) Place the unit with the rear panel facing downward.
3) Push thelock shaft to the in (LOCK) position ( Am ).
VAROITUS! Laite sisaltaa laserdiodin,
joka lahettaa nakymatonta silmille
vaarallista lasersateilya
CLASS 1
LASER PRODUCT
‘saw0?
Obs:
Apparaten innehaller laser
Komponent av hoger laserklass
an klass 1,
B® Place ona flat, level surface so that the front-rear inclination
does not exceed 5°.
@ Avoid places such as the following:
Near any equipment or device that generates strong
magnetism.
© On any heat-generating equipment or device, or in any place
where the temperature is high (40°C or higher).
Extremely cold places (5°C or below).
Near a tuner or TV
(It may cause noise in the broadcast, or disturbance of the TV
picture.)
¢For long periods of time in direct sunlight.
e|n dusty or smoky locations.
In locations prone to vibrations.
@{n locations where the rear panel is less than 10 cm (about 4”)
away from the wall or back of an audio rack.
eWithin reach of children.
@ Donot place heavy objects, other than system components,
on top of the unit.
@ When carrying or storing the unit, handle it with care so it is
not subjected to any strong bumps.
Always remove the disc before storing the unit for any period
of time.
—™ To avoid problems due to vibration.
¢Do not place a book or similar object under this unit.
®Do not route the connection cables (of this or other units)
across the operation panel, across the top, or under the unit.
Hi CONNECTIONS
SL-P250
“CD” or “AUX”
terminals
Stereo connection
Amplifier
or receiver
(option)
Kila] Household
AC power supply VN, AC outlet
cable
(included)
cord
(included)
This
(R)(L)
unit
ung
out
~
ew
Fit
a
suitable
plug
to
iO]
the
AC
power
supply
CO
cord.
Mi CONCERNING COMPACT DISCS
Handling precautions
Only compact discs having this mark can
be used with this unit. ) ise
DIGITAL AUDIO
Observe the following precautions to enjoy the same
outstanding sonic performance from your Compact Discs
for many years.
Hold compact discs by the edges so the surface is not soiled
with fingerprints.
© Be careful not to scratch the surface with fingernails or other
sharp objects, particularly when inserting and removing discs
from their cases.
®Do not bend the disc.
Do not use record cleaning sprays or static electricity preven-
tion liquids.
®Do not wipe with benzine, thinner or any other solvent. If the
surface is soiled, wipe gently with a soft, damp (water only)
cloth.
eWhen wiping discs, always move the cloth directly outward
from the center of the disc, not in a circular motion as with
standard phonograph records.
(Incorrect)
(Correct)
(In compact discs, circular scratches along a line of pits are
more likely to cause errors than straight scratches across many
lines of pits.)
*\f the disc is brought from a cold environment into a warm
room, moisture may form on the disc. Wipe this off with a soft,
dry, lint-free cloth before using the disc.
Do not dry discs with a hair dryer.
®Do not write on the label side with a ball-point pen, hard pencil
or other writing utensil.
Handle compact discs with care. Fingerprints, dirt and
scratches can cause skipping and distortion.
Storage precautions
Be sure to store discs in their cases to protect them from dust,
scratches and warping.
*Do not place or-store discs in the following places:
1) Locations exposed to direct sunlight.
2) Humid or dusty locations.
3) Locations directly exposed to a heat outlet or heating
appliance.
4) In the glove compartment or rear ledge of an automobile.

SL-P250 SL-P250
Mi
FRONT
PANEL
CONTROLS
AND
FUNCTIONS
Control section
Q) Power switch (power)
@ Disc tray
@) Remote-control signal receptor
(remote sensor)
@) Numeric buttons (1~0, +10)
These buttons can be used to select the track numbers and
the recording time.
G) Preset edit play button (preset edit)
This button can be used to specify the playing time.
©) Time-mode select button (time mode)
@) Repeat button (repeat)
Programmed/continue button
(program/continue)
@
Play
button
(play
»)
Pause button (pause #1)
Pause mode:
Play
is
stopped,
but
the
pickup
remains
where
it
was
at
the
time
when
the
pause
button
was
pressed.
The
disc
rotates while the unit is in the pause mode.
@ Stop/clear button (stop/clear Ml)
This button can be used to stop the disc play, as well as to
cancel the various play modes.
Stop mode:
In
the
stop
mode,
the
pickup
is
at
the
beginning
of
the
first
track
and
the
display
shows
the
total
number
of
tracks
and
total
playing
time
of
the
disc.
(The
disc
does
not rotate.)
@
Skip
buttons
(
eq
skip/skip
>
)
@) Search buttons (<< search/search »> )
These
buttons
can
be
used
to
locate
a
desired
part
of
the
disc
at
high
speed
(forward
or
backward)
during
disc
play.
(The
search
speed
is
slow
when
the
button
is
first
pressed,
and
becomes
faster
if
the
button
is
pressed
and
held
continuously.)
Open/close button
(open/close 4)
(5 Headphones volume control
Headphones jack (phones)
HABE
ODEROEBBE
eee
eae
©O @O
| Indicators section
@)
Disc
indicator
([aisc
])
This indicator illuminates when a disc is loaded.
Programmed-play indicator ([program])
©) Track number display (track)
0)
Index-number
display
(No./index)
This
display
shows
the
index
number
as
well
as
the
sequence
of
programmed
play.
© Time display (min/sec)
©) Repeat indicator ([])
© Preset edit indicator ([eait })
()
Random-play
indicator
([random])
©)
Music
scan
indicator
(
[u-scan
])
©
Play
indicator
(
[>=]
)
()
Pause
indicator
(
[7
_]
)
(©) Over mark ( >)
The “b>” indicator illuminates if the total nunber of tracks
on the disc is 21 tracks or more.
When
the
play
reaches
the
21st
track
and
thereafter,
the
“S>” begins flashing.
™) Music matrix ([1]~ fq )
The
numbers
of
the
tracks
on
the
disc
are
dishayed
uptoa
maximum of 20.

gi REMOTE-CONTROL TRANSMITTER
EUR64787...Other areas
Black version: EUR64786...[M] and [MC] ai
Silver version: EUR64792...Other areas
Insertion of remote-control transmitter batteries
1. Open the cover.
Bottom panel of
remote-control
transmitter
Je
PASS
2. Insert the batteries
and close the cover.
Use two UM-4
“AAA” (RO3) size
(1.5V) batteries.
@ To remove the batteries
Reverse procedure above.
Hf Battery life About 1 year.
(Depending on frequency of use.)
@ Notes concerning use of dry
batteries
® Do not use re-chargeable batteries (Ni-Cd
type).
Be sure the batteries are inserted so that
the positive (+) and negative (—) polarities
are correct. Batteries installed with incor-
rect polarities may leak and damage the
remote-control transmitter.
Never subject the batteries to excessive
heat or flame; do not attempt to disas-
semble them; and be sure they are not
short-circuited.
®lf the remote-control transmitter is not to
be used for a long time, remove the
batteries and store them in a cool dark
place.
eAlways remove old, weak or worn-out
batteries promptly and dispose of them.
®Never mix old and new batteries, nor
batteries of different types (carbon or
alkaline).
Although battery life varies depending
on how often the remote-control trans-
mitter is used, the batteries should be
replaced about once every year on the
average.
The batteries should also be replaced if
commands from the remote-control trans-
mitter are not received by this player
even when the transmitter is held close
to the player's front panel.
elf the batteries leak, clean the battery
holder well before inserting new bat-
teries.
@Do not use remote-control transmitter
for TV sets, VCRs or other components
at the same time as this player’s remote-
control transmitter since this would
result in a mistaken operation.
Operation notes
Note that operation may not be correct if direct sunlight or other strong light strikes the remote-control signal receptor part of this unit. If there
is a problem, place the unit away from the direct sunlight or other strong light source.
Face it toward the remote-control
signal receptor.
(Obstacles should
be avoided.)
Use the remote-control transmitter
within 7 meters.
==
7 meters
(23 ft.)
Be sure the transmitter part of the remote-control
transmitter and the receptor part of this unit are free
from dust. Excessive dust might prevent reception.
Avoid dust.
Note: Thecontrol panel of the remote-control transmitter may be covered by a clear plastic protective sheet. This sheet may be removed if
desired.
Remote functions
a) Search buttons (<< search PP )
@) Numeric buttons (1~0, +10)
©) Time-mode select button
(time mode)
@ Repeat button (repeat)
a) Random-play button (random)
This button can be used to select
“random” play (the unit's
microcomputer selects the
sequence of track play in a random
order).
(On theremote-control transmitter only.)
piayed.
@) Stop/clear button (™@ stop/clear)
Pause button (II pause)
® Play button (» play)
When this button is pressed, the first 15 seconds of
each track on the disc or each programmed track is
(On the remote-control! transmitter only.)
| Si.Pp250_
Mi HANDLING PRECAUTIONS FOR OPTICAL PICKUP
The laser diode in the optical pickup may break down due to potential difference caused by static electricity of
clothes or human body.
So, be careful of electrostatic breakdown during repair of the optical pickup.
¢ Handling of optical pickup Bc. Suen login
1. Do not give excessive shock to the optical pickup twee te 4 P|
because it is of extremely precise structure. iS nena ;
2. To prevent the breakdown of the laser diode, an anti-
static shorting pin is inserted into the flexible board.
(FPC board)
When removing or connecting the short pin, finish the
job tn as short time as possible.
3. Take care not to apply excessive stress to the flexible
board. (FPC board)
4. Do not turn the variable resistor (laser power adjust-
ment). It has already been adjusted.
Be sure to short this position
(Use the shorting pin or clip.)
Optical pickup
Lens (Do not touch)
FPC board
(Handle it carefully)
Variable resistor (Do not turn)
® Grounding for electrostatic breakdown prevention
1. Human body grounding
Use the anti-static wrist strap to relieve the static
electricity from your body.
2. Work table grounding
Put a conductive material (sheet) or steel sheet on the
area where the optical pickup ts placed, and ground the Wrist strap
sheet.
(Anti-static
bracelet)
Caution:
The static electricity of your clothes will not be grounded
through the wrist strap. So, take care not to let your
clothes touch the optical pickup.
tron plate or some metals
to conducte fectricity
INSTRUCTIONS FOR THE OIL (Part No. SZZ0L31)
The container contains 6g (approx. 3ml) of oil. Since
one application (one shaft) uses 0.05ml of oil.
How to Use wa
(1) Remove the guide shaft in the traverse deck from
the optical pickup and clean off any dust from the
guide shaft.
(2) Apply one drop of the SZZOL31 to the tip of the
guide shaft.
(3)
Hold
the
guide
shaft
so
that
its
oiled
end
touches
Optical
pickup
the optical pickup and insert it into the bearing Gg
while rotating it slowly. —_
(4) After securing the guide shaft, move the optical — ties
pickup by hand several times to the left and right
to distribute the oil on the guide shaft.
Guide shaft

li DISASSEMBLY INSTRUCTIONS
Neer,
enh
CAUTION:
®
It
is
very
dangerous
to
look
at
or
touch
laser
radiation.
(Laser
radiation
is
invisible.)
e
With
the
unit
turned
“on”,
laser
radiation
is
emitted
from
the
pickup
lens.
@
When
removing
the
cabinet
and
disc
clamper
of
this
unit,
be
sure
to
turn
the
power
supply
off.
SL-P250 SL-P250
sae
Ref. No.
S-
How to remove the cabinet
:
Ref. No.
3
How
to
remove
the
disc
holder
and
power
switch
rod
Procedure | 4. Remove the 4 screws.
—=s x 7S ES CE SC 2
How to remove the disc clamper
and magnet
Procedure
1-2
e Release the claw.
¢Turn the holder in the direction of the
arrow, then release the claw.
Disc clamper
| Procedure
1-2-3
Screwdriver
.
Push
the
rack
gear
slowly
in
the
.
Pull
the
disc
holder
until
it
stops.
. Release the claw.
.
Pull
out
the
disc
holder
further
to
remove
it.
.
To
remove
the
power
switch
rod;
direction
of
the
arrow
until
the
disc
tray
comes
up.
A.
Set
the
power
switch
in
the
“OFF”
position.
B.
Remove
the
power
switch
rod
by
using a screwdriver.
Disc holder
IF
How to check the servo P.C.B.
Procedure
1-2 a —4
Traverse unit
saa How to remove the front panel
Procedure
1-6
¢When checking the soldered surfaces
of the servo P.C.B. and replacing the
parts, do as shown.
Servo P.C.B.
¢ Remove the 2 screws.
¢Slightly pull out the tab and remove
the front panel in the direction of the
arrow.
a.
Front panel
(To play a disc)
Place the test disc and magnet.
2. Turn “ON” the power switch of the
player while holding the levers of the
switches (S101, $102) in the direction
of the arrow.
Front panel
How to remove the operation P.C.B.
and headphones amp. P.C.B.
A. Operation P.C.B.
1. Remove the 4 screws (9~®).
2. Release the 7 claws.
Procedure
1-6-7
B. Headphones amp. P.C.B.
1. Pull out the level control knob.
2. Remove the 2 screws (@,@).
Operation
P.C.B. Claws
Claws
Headphones P.(.B.
8
‘psy 20
Level
control
®
knob
——_—___———_,
Pad EN ae

Ref. No.
8
Procedure
1-6-8
How to remove the main P.C.B.
1.
Remove the 4 screws.
2. Lift the P.C.B. remove it from the
chassis tab.
3. Remove the P.C.B. in the direction of
the arrow.
Main P.C.B.
How to check the main P.C.B.
eWhen checking the soldered surface
of the main P.C.B. and replacing the
parts, do as shown.
Cautions:
¢Be sure to connect the P.C.B. ground
terminal (line out terminal) and the
chassis with a Jead wire.
¢Be sure to connect the GND lead wire
from the loading base to the chassis.
Lead wire
Ref. No. | How to remove the servo P.C.B. Ref. No.
and loading motor P.C.B. 10 How to remove the optical pickup
Procedure Procedure
1>2+3-—4| A. Servo P.C.B. I aaa Refer to the optical pickup handling
= 1. Remove the 3 screws (@~®). precautions and instructions for the
2. Unsolder the 2 terminals of spindle oil (See page 6).
motor.
3. Remove the FPC board from the 1. Remove the 2 screws (@, @).
optical pickup. 2. Unsolder the 2 terminals and the 2
Caution: corpus (@, @):
Insert the short pin into the FPC board
in order to pervent breakdown of laser 1)
diode. (Refer to page 6) Optical pickup ©)
B. Loading motor P.C.B.
1. Remove the 2 screws (@, ©).
© @O
4 To) &
Loading
motor
Spindle
motor
terminals
—11—
Terminals
Caution: Take care not to touch
the brush terminal.
Procedure
1-2--11
Ps)
@®
—_—o a
°o
Ref. No.
12
Procedure
1-2-3-
9-12
Ref. No.
13
Procedure
How to remove the loading motor
1. Push the rack gear slowly in the direc-
tion of the arrow until the disc tray
comes up.
. Pull the disc holder until it stops.
. Remove the drive belt.
| SL-P250__
Loading
motor
. Remove the 2 screws.
Claw
On & ON
. Release the claws.
Disc holder
Disc tray
How to remove the spindle motor
1. Loosen the screw (@) by using a
1.27mm hexagonal wrench and remove
the turntable.
2. Remove the 2 screws (Q, ©).
Caution:
1. Turntable height adjustment is necessary any
time the turntable or spindle motor is replaced.
2. The (+) terminal of the spindle motor is indicated
by the red mark.
Adjustment of turntable height
1. Insert a 0.9mm feeler gauge (RZZ0297) between the
turntable and loading base as shown below.
Turntable
0.9 mm feeler
ata
gauge
(RZZ0297)
i
Spindle motor
2. Tighten the turntable set-screw by using a 1.27mm
hexagonal wrench.
Caution:
Refer to optical pickup adjustment (see page 18).
How to remove the power transformer
1. Remove the connector (CN1).
2. Remove the 2 screws.
3. Release the Tab.
Turntable
Red mark

Mi MEASUREMENTS AND ADJUSTMENTS
SL-P250 SB 2510)
Caution:
@
It
is
very
dangerous
to
look
at
or
touch
the
laser
beam.
(Laser
radiation
is
invisible.)
With
the
unit
turned
“on”,
laser
radiation
is
emitted
from
the
pickup
lens.
Avoid
exposure
to
the
laser
beam,
especially
when
performing
adjustments.
PLAYER SETTING
1. Remove the cabinet. (Refer to page 9.)
2. Remove the disc clamper and magnet. (Refer to
page 9.)
3. Remove the disc holder and power switch rod.
(Refer to page 9.)
© Setting of the test disc (Shown at the right figure.)
1. Place the test disc and magnet.
2. Turn “ON” the power switch of the player, while
holding the levers of the switches ($101, S102)
in the direction of the arrow.
3. Release the levers of the switches (S101, $102)
after the test disc starts rotating.
ADJUSTMENT POINTS
¢ Servo P.C.B.
(Focus
offset adj.)
[pte
VR106 VR501| (PLL adj.)
(Tracking VR102] (Tracking gain adj.)
balance adj.) [vR101] (Best eye adj.)
(Tracking offset adj.)
© Main P.C.B.
LINE OUT
(L) (R)
| PLL adjustment test point
Dis (+12V)
->-” Connect the red lead
i j :
D21 wire of servo gain ajuster
@ (—12V)
Connect the blue lead
wire of servo gain adjuster.
¢ Filter for turntable height adjustment
Resistor: 10kQ
(ERDS2TJ103)
To oscilloscope (+)
Capacitor: 0.1pF
(ECQM1H104KV)
To oscilloscope (—)
ELECTRICAL ADJUSTMENT
Measuring Instruments and Special Tools
@ Servo gain adjuster (SZZP1017F)
@Test discs
Test disc (SZZP1014F) old or new type
Inspection test disc (SZZP1054C)
Uneven disc (SZZP1056C)
Black band disc (SZZP1057C)
@ Ordinary disc
@ Two-channel oscilloscope (with trigger)
of 30MHz or over
@ Low frequency oscillator
@ Conversion connector(SZZP1032F)
Step 7:Tracking offset adjustment.
(Refer to page 16.)
Step 8:Tracking offset balance
adjustment. (Refer to page 16.)
Step 9:Disconnect the servo gain
adjuster.
Step 10:PLL adjustment.
(Refer to page 17.)
Step 11: Check of play operation after
adjustment. (Refer to page 17.)
Adjustment Procedure
Step 1:Make the temporary setting of
each VR . (Refer to page 15.)
Step 2:Best eye ( PD balance ) adjustment.
(Refer to page 15.)
Step 3:Connect the servo gain adjuster.
(Refer to page 14.)
Step 4:Focus gain adjustment.
(Refer to page 15.)
Step 5:Tracking gain adjustment.
(Refer to page 15.)
Step 6:Focus offset adjustment
(Refer to page 16.)
Connection of Servo Gain Adjuster
Low-frequency oscillator
©OO0O
Servo gain adjuster |
(SZZP1017F) GND OSC Oscillator connection terminals
ON/OFF switch
pari ee 2 Conversion connector
GNO® « (SZZP1032F)
Selector }
oO F osc @®
7 2 fF)
Tp3Tp2 ° i
@@®@ TP!
or
»|
=
i
iy
|
Oscilloscope Oscilloscope connection 1
Red
Wr)o_o terminals
~~} ©
OO] TP2 TP3 TPr
CHIp _9CH2
me f ! | ‘
-—12V GND +12V
(Main) (Chassis) (Main)

TEMPORARY SETTING OF EACH VR
Note :
If a disc skips or can not be played back, adjust each VR
temporarily, as shown.
VR106 VR101 VR105
lt felt fl
BEST EYE(PD BALANCE) ADJUSTMENT
1.Connect CH1 of the oscilloscope to TJ101 (+) and GND
(-) of the servo P.C.B.
Oscilloscope setting: VOLT 200mV
SWEEP.....0.5usec.
2.Set atest disc (SZZP1014F or SZZP1054C) and turn ON
the power switch of the player. (Refer to page 13.)
3.Set the player to the play mode.
4.Adjust VR101 so that the eye pattern of RF signal is
stretched to maximum.
5.Turn OFF the power switch of the player.
FOCUS GAIN ADJUSTMENT
1.Connect the servo gain adjuster.(Refer to page 12.)
2.Set the selector switch of the servo gain adjuster to 2
and ON-OFF switch to ON.
3.Set the low frequency oscillator to a frequency of 825Hz
and an output voltage of 100mVp-p. Then connect the
oscillator to OSC (+) and GND (-) terminals of the servo
gain adjuster.
4.Connect CH1 and CH2 of the oscilloscope to TP1 and TP2
of the servo gain adjuster.{ TP3 is the ground terminal.)
Oscilloscope setting: VOLT 100mV(both channels)
5.Set atest disc (SZZP1014F or SZZP1054C) and turn ON
the power switch of the player. (Refer to page 13.)
6.Set the player to the play mode.
7.Set the selector switch of the servo gain adjuster from
von to ee Ye
8.825Hz signals will be displayed on the oscilloscope.
Adjust VR104 until the waveform amplitudes of both
channels are equal.
9.Shift the selector switch of the servo gain adjuster from
”3” to"2”.
TRACKING GAIN ADJUSTMENT
1.Oscilloscope setting and connections are the same as
above.
2.Set the low frequency oscillator to a frequency of 1.0kHz
and an output voltage of 100mVp-p.
3.Set the selector switch of the servo gain adjuster from
no” to wear.
4.1.0kHz signals will be displayed on the oscilloscope.
Adjust VR102 unti! the waveform amplitudes of both
channels are equal.
5.Shiftthe selector switch of the servo gain adjuster from
vq" to iy ke
VR104 VR102 VR103
KININ Gt
CAA x
AX AARON
. OUUSCOCNEES Kx
3X Most stretched eye pattern.
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FOCUS OFFSET ADJUSTMENT
1.Connect CH1 of the oscilloscope to TJ101 (+) and GND
(-) of the servo P.C.B.
Connect CH2 of the oscilloscope to FEG (+) and GND (-)
of the servo P.C.B.
Oscilloscope setting: VOLT 200mV(CH1),
500mV(CH2)
SWEEP.....0.5msec.
(Triggering via CH1)
2.Set the test disc (SZZP1057C) and turn ON the power
switch of the player. (Refer to page 13.)
3.Set the player to the play mode.
4.Check the waveform of CH1 and CH2 on the oscilloscope
and adjust VR105, so that the waveform around the
triggering point becomes as shown in the illustration.
TRACKING OFFSET ADJUSTMENT
1.Connect CH1 of the oscilloscope to TJ101 (+) and GND
(-) of the servo P.C.B.
Connect CH2 of the oscilloscope to TEG (+) and GND (-)
of the servo P.C.B.
Oscilloscope setting: VOLT. 200mV(CH1),
500mV(CH2)
SWEEP.....0.5msec.
eh DC(CH2)
are senine via CH1)
2.Set the test disc (SZZP1057C) and turn ON the power
switch of the player. (Refer to page 13.)
3.Set the player to the play mode.
4.Check the waveform of CH1 and CH2 on the oscilloscope
and adjust VR103, so that the waveform around the
triggering point becomes as shown in the illustration.
TRACKING OFFSET BALANCE ADJUSTMENT
1.Set the low frequency oscillator to a frequency of 1kHz
and an output voltage of 200mVp-p. Then connect the
oscillator to OSC (+) and GND (-) terminals of the servo
gain adjuster.
2.Connect CH1 of the oscilloscope to TJ101 (+) and GND
{(-)of the servo P.C.B.
Oscilloscope setting: VOLT 500mV
SWEEP.....0.5msec.
2.Set a test disc (SZZP1014F or SZZP1054C) and turn ON
the power switch of the player. (Refer to page 13.)
4.Set the player to the play mode.
5.Set the selector switch of the servo gain adjuster from
"2” to "1".
6.Adjust VR106, so that the output waveform is as shown
(jitter is minimized).
7.Shift the selector switch of the servo gain adjuster from
4” to DUS
8.Turn OFF the power switch of the player.
9.Disconnect the servo gain adjuster.
Smooth envelope
Minimize the amplitude or
make A=B
Smooth envelope
Pearse
Minimize the amplitude or
make A=B
“Jitter should be minimized.
SL-P250

PLL ADJUSMENT
1.Connect CH1 of the oscilloscope to the LINE OUT
terminal (either of Lch or Rch) and ground.
Oscilloscope setting: VOLT
2.Set the test disc (SZZP1054C) and turn ON the power
switch of the player. (Refer to page 13.)
3.Play Track No.6 (wedge 0.7mm) of the test disc.
4.Check the waveform displayed on the oscilloscope and
adjust VR501 in the following steps.
Step 1.Turn VR501 clockwise slowly and observe the
point at which the waveform on the oscilloscope
begins to be disturbed.
Step 2.Turn VR501 counterclockwise slowly and observe
the point at which the waveform on _ the
oscilloscope begins to be disturbed.
Step 3.Set VR501 in the middle between the points
observed in the above steps ” 1” and” 2”
Noise started to appear in output sound with
_’ VR501 turned counterclockwise.
Final setting point.
‘\ Noise started to appear in output sound with
VR501 turned clockwise.
CHECK OF PLAY OPERATION AFTER ADJUSTMENT
Check of skip search
1.Play an ordinary disc.
2.Press the skip button and verify skip search operation
(forward and reverse).
Check of manual search
1.Play an ordinary disc.
2.Press the manual search button and verify that smooth
manual search can be performed at low and high speeds
(forward and reverse).
OPTICAL PICKUP ADJUSTMENT
Measuring Instruments and Special Tools
@ Tow-channel oscilloscope (with trigger)
of 30MHz or over
@ Test discs
Test disc (SZZP1014F) old or new type
Inspection test disc (SZZP1054C)
Unevendisc (SZZP1056C)
Adjustment Procedure’
@ if the optical pickup and spindle motor are replaced ,
adjust itaccording to the following procedure.
Step 1:Make the temporary of
each VR. (Refer to page 15.)
Step 2Turntabie height adjustment.
(Refer to page 18.)
SL-P250 SL-P250
E |
MViAVER VRE
Hse DR iS 2
Ree Se
Check of playability
1.Play the test disc (SZZP1054C).
2.Play
the
track
No.6
(wedge
0.7mm)
and
verify
that
there
is
no skip
sound
or
noise.
3.Play
the
track
No.13
(black
dot
0.7mm)
and
verify
that
there
is
no
skip
sound
or
noise.
@ Hexagonal wrench (2.0mm)
@Screw lock paint (RZZ0L01)
@ Hexagonal wrench (1.27mm)
@Feeler gauge (RZZ0297)
@Filter (Refer to page 13)
Step 3:Mechanical adjustment.
(Refer to page 18.)
Step 4:Electrical adjustment.
(Refer to page 14.)
TURNTABLE HEIGHT ADJUSTMENT
1.Connect
CH1
of
the
oscilloscope
to
FEG
(+)
and
GND
Adjust
the
turntable
height
as
follow:
(-)
of
the
servo
P.C.B.through
the
filter.(Refer
to
page
A.Insert
the
0.9mm
feeler
gauge
(RZZ0297)
as
shown
41.)
below.
Oscilloscope setting:VOLLT.........
0.9 mm feeler
gauge (RZZ0297)
2.Set the oscilloscope to DC zero balance.
3.Set
a
test
disc
(SZZP1014F
or
SZZP1054C
and
turn
ON
the
power
switch
of
the
player.
(Refer
to
page
13.)
4.Set the player to the play mode.
5.Measure
the
DC
level
(AmV)
displayed
on
the
oscilloscope.
@lf
the
value
of
A
is
within
the
range
of
+
60mvV
,
the
turntable
height
is
correct.
If it
is
not
within
this
range
,
make
the
necessary
adjustments
using
the
0.9mm
feeler
gauge
(RZZ0297).
If Ais more than +60mvV , make the turntable lower.
if
Ais
less
than
-60mV
,
make
the
turntable
higher.
B.Loosen the turntable set-screw.
C.Adjust
turntable
height
to
0.9mm
with
the
feeler
gauge
as
shown
above.
D.Tighten
the
turntable
set-screw
by
using
the
1.27mm
hexagonal
wrench.
E.Check
the
turntable
height
adjustment
by
following
steps 1 ~ 5 above.
MECHANICAL ADJUSTMENT
1.Connect
CH1
of
the
oscilloscope
to
TJ101
(+)
and
GND
(-)
of the
servo
P.C.B.
Oscilloscope
setting:VOLT........
200mV
SWEEP.....0.5usec.
4.Monitoring RF signal on the oscilloscope, adjust the two
adjusting screws alternatelywith the 2.0m™m hexagonal
wrench so that the vertical fluctuation of RF signal is
minimized and the eye pattern is most stretched.
5.Turn OFF the power switch of the player.
6.After the adjustment, apply screw lock paint(RZZOL01)
to the adjusting screws.
2.Set
the
test
disc
(SZZP1056C)
and
turn
ON
the
power
swith
of
the
player.
(Refer
to
page
13.)
3.Using
the
manual
search
buttons
,
move
the
pickup
so
that
the
mechanical
adjustment
screws
line
up
with
the
adjustment holes in the bottom panel.
Pick-up | Sea
sil
{
Note:The
mechanical
adjustment
screws
have
been
already
locked
with
screw
lock
paint
at
the
factory.
It
might
be
hard
to
turn
them.
SN
[AAS
TARY
eh XA 0.914, DOU Xt
SOS OI8 COCO NEN,
pes (tests
Lele,
HH
Mechanical adjustment screws