Technics SL-PC25 User manual

ORDER NO. AD9006180C9
Service
Manual
Multi Compact Disc Player
SL-PC25
Color
(K)... Black Type
COMPACT
IDIGITAL_|
DIGITAL AUDIO
Area
Country
Code
Continental Europe.
(EB) Great Britain.
Asia, Latin America,
Middie Near East and
Africa.
Far East-PX.
SL-PC10 MECHANISM SERIES (RXK0087)
SPECIFICATIONS
@ Audio @ Pickup
No. of channels 2 (left and right, stereo) Wavelength 780 nm
Frequency response 2-20,000 Hz+1 dB
Output voltage 2 V (at 0 dB) @ General
Dynamic range 96 dB Power supply
S/N ratio 96 dB For Continental Europe: AC 50/60 Hz, 220 V
For Great Britain and Oceania: AC 50/60 Hz, 240 V
For others: AC 50/60 Hz, 110 V/127 V/220 V/240 V
MASH‘ (4 DAC) Power consumption 138W
1kQ Dimensions (WxHxD) 430 x 109.5 x 362 mm
Weight 4.1 kg
0.005% (1 kHz, 0 dB)
Below measurable limit
Total harmonic distortion
Wow and flutter
DA converter
Output impedance
Load impedance
More than 10 kQ
Specifications are subject to change without notice.
Weight and dimensions shown are approximate
“MASH
®MASH (Multi-Stage Noise Shaping) is an effective over-
sampling D/A conversion technique which realizes a high
S/N ratio and needs no highly complex manufacturing
processes such as a laser trimming.
®@MASH is trademark of NTT (Nippon Telegraph and Tele-
phone Corporation).
Panasonic Tokyo Sales Department
Technics
Matsushita Electric Industrial Co., Ltd.
Central P.O. Box 288, Osaka 530-91, Japan
Matsushita Electric industrial Co., Ltd.
World Trade Center Bldg., 4-1, Hamamatsu-cho,
2-chome, Minato-ku, Tokyo 105, Japan

SL-PC25
M@ CONTENTS
Page
INSTALLATION ...........0.. 00 cc ee eee eeeee 2
ACCESSORIES 's 5:8 cee 2S oie e6 OS eo a a ee ae 2
PRECAUTION OF LASER DIODE ................. 3
CONNECTIONS ..........0.. 0000 eee eee eae 4
FRONT PANEL CONTROLS AND FUNCTIONS ......... 5
PLAYING A DISC .........2..22 2002 eee eee 6,7
REMOTE CONTROL TRANSMITTER ..............-- 7
HANDLING PRECAUTIONS FOR OPTICAL PICKUP ...... 8
INSTRUCTIONS FOR TRAVERSE OIL
(Part No, SZZOL31) 2... 2. ee ee 8
DISASSEMBLY INSTRUCTIONS .............. 9~13
MEASUREMENTS AND ADJUSTMENTS ......... 13 ~19
TERMINAL FUNCTION OF IC’S .............. 20 ~ 24
BLOCK DIAGRAM .............0002002 a 25 ~ 27
Mi INSTALLATION
Transport lock
The optical pickup is secured to prevent damage during transport.
Be sure to release it before use.
1 2
@ Remove the
*\clamper.
Lock shaft Pull to unlock.
@ (in the locked
Pull condition)
NOTE:
IF THE UNIT IS TRANSPORTED
AGAIN, PERFORM THE
FOLLOWING STEPS:
1. Turn the power on and remove
all discs from the trays.
2. PRESS THE DISC SKIP
BUTTON on the top panel and
turn the power off.
3. Insert the clamper into the slot
on the bottom of the unit and turn
it clockwise.
. Place the unit with the right
panel facing downward.
Press the lock shaft to the LOCK
position (MM _. m).
CAUTION:
Do not transport the unit without
locking the lock shaft.
SEVERE DAMAGE WILL
RESULT.
Soft cloth or similar material
(to prevent scratches)
>
li ACCESSORIES
Page
INTERNAL CONNECTION OF FL ................ 28
SCHEMATIC DIAGRAM ..............-.... 29 ~ 35
TERMINAL GUIDE OF IC’S
TRANSISTORS AND DIODES ................ 36
PRINTED CIRCUIT BOARDS ................ 37 ~ 40
WIRING CONNECTION DIAGRAM ...............- 41
REPLACEMENT PARTSLIST................. 42~45
EXPLODED VIEWS ............ 0000 eee eee 46 ~ 48
RESISTORS & CAPACITORS ................. 49,50
PACICUNG 1 orn Buia Suse dace gay od aed: Beis ee ehae Nada eos 50
TROUBLESHOOTING FLOWCHART........... 51~ 54
* TECHNICAL INFORMATION
* This technical information is located on pp 45 ~56 of the SL-PC10
Service Manual (Order No. AD8904091C1).
Therefore, refer to that Service Manual.
Placement notes
@ This unit is a precision instrument. Be sure to place it on a
flat surface.
@ Avoid places such as the following:
e@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 (35°C or higher).
eExtremely cold places (5°C or below).
eNear a tuner or TV (It may cause noise in the broadcast, or
disturbance of the TV picture.)
eFor long periods of time in direct sunlight.
@ln dusty or smoky locations.
eln 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.
@ 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.
@ AC power supply cord....1 @ Stereo connection cable....1 @ Dust cover............ 1
SJA187_—(E) (SJP2249-3) (RYFO082)
SJA193 (EB)
SJA173 (GN)
RJA0004 (GC, PX)
® Remote control @ Batteries...........-.0.. 2 @ AC plug adaptor ...... 1
transmitter .........-.-- 1
(EUR64789B)
(UM—4NE/2S) [SJP9215 (GC, PX)]
pea aes

MIPRECAUTION OF LASER DIODE
CAUTION: This product utilizes a laser diode with the unit turned “on”, invisible laser radiation is emitted from
the pick up lens.
Wave length: 780nM
Maximum output radiation power from pick up: 100HW/VDE
Laser radiation from the pick up lens is safety level, but be sure the followings:
1. Do not disassemble the optical pick up unit, since radiation from exposed ‘aser diode is
dangerous.
2. Do not adjust the variable resistor on the pickup unit. It was already adjusted.
3. Do not look at the focus lens using optical instruments.
4, Recommend not to look at pick up Jens for a long time.
ACHTUNG: Dieses produkt enthalt eine laserdiode. Im eingeschalteten zustand wird unsichtbare laserstrahlung
von der lasereinheit abgestrahlit.
Wellenlange: 780nM
Maximale strahlungsleistung der lasereinheit: 100 ujW/VDE
Die strahtung an der lasereinheit ist ungefahrlich, wenn folgende punkte beachtet werden:
1. Die lasereinheit nicht zerlegen, da die strahlung an der freigelegten laserdiode gefahriich ist.
2. Den werksseitig justierten einstellregler der lasereinreit nicht verstellen.
3. Nicht mit optischen instrumenten in die fokussierlinse blicken.
4. Nicht Gber langere zeit in die fokussierlinse blicken.
ADVARSEL: | dette a apparat anvendes laser.
SYNCHRO
TOT LINE OUT” EpiT
Rear panel
of this unit
e Use of caution labels
CLASS 1
LASER PRODUCT
Note: © Mark is used, x Mark is not used.
RQLS0021
Others
Obs:
Apparaten innehaller laser
Komponent av hdger laserklass
an klass 1.
RQLS0021
ADVARSEL: USYNLIG LASERSTRALING
VEO ABNING, NAR SIKKERHEDSAF-
BRYDERE ER UDE AF FUNKTION.
UNDGA UDSATTELSE FOR STRALING.
VORSICHT-Unsichtbare | OANGER-Invisible
Laserstrahlung, wenn §f laser radiation when
Abdeckung gedffnet. open.
Nicht dem Strahl AVOID DIRECT EX-
aussetzen. eacsoozi ff POSURE TO BEAM.

1B OY40)
li CONNECTIONS
Before making connections, be sure that the power to this unit and all other connected equipment is first turned off.
SYNCHRO
LINE OUT Epit
Rear panel
of this unit
(R) (L)
Fes
5
[2] 3] To the household
| e AC outlet
To the “CD” or ‘“AUX” To the ‘SYNCHRO EDIT”
terminals of the amplifier terminal of the Technics
cassette deck
[1] Stereo connection cable (included) ;
How to install the dust cover.
[2] L-type cable
Note:
This cable is included only with the cassette deck having the
appropriate “SYNCHRO EDIT” terminal.
[3] AC power supply cord (included)
Note:
The configuration of the AC outlet and AC power supply cord
differs according to area.

Mi FRONT PANEL CONTROLS AND FUNCTIONS
Control section
The functions indicated by the numbers with black background (@)
can also be activated from the remote contro! transmitter. (See
page 7.)
Carousel
@) Power switch (power)
Press (BW m) to switch the power on.
Press again (m_.M) to switch the power off
@ Remote control signal sensor
(remote sensor)
o ~@ Random button (random)
Press this button to let the microcomputer make a random
selection of the sequence in which discs and tracks are
played during continuous play or program play
Press the button again to cancel the random play mode
© Repeat button (repeat)
Press this button to activate the repeat mode. The repeat
indicator illuminates.
Press again to cancel the repeat mode. The repeat indicator
will no longer illuminate
© Time mode button (time mode)
Use this button to select the desired time mode. The display
information will change as follows each time the button is
pressed
(1) Track number and its elapsed play time
@ Track number and remaining time of current track
@ Total track numbers and playing time of the current disc
@ Total elapsed play time of the current disc
© Buttons for edit function ( IMIZETI )
eEdit tape length button (tape length)
When compact discs are to be recorded to tape, this button
can be used to calculate the number of tracks that can be
recorded on each side of the tape, depending on the length
of the cassette tape used. so that as little tape as possible is
wasted.
eAuto link button (auto link)
This button can be used for automatic edit recording from
several discs.
°
Search buttons (4< search >P)
Use these buttons to move the pickup forward and backward
©
Disc button (disc 1~5)
These buttons are used to select the desired disc for
sequential or program piay
Disc trays (1~5)
One disc per tray can be loaded
Stop button (MM stop)
Pause button (il pause)
Play button (P play)
©20ee6 ©
Disc skip button (disc skip)
Each time this button is pressed, the carousel! will rotate ina
clockwise direction to the next tray position. This allows for
loading or unloading of discs
This button is also used to select the next disc, in the
continuous or random play mode
@® Program/continue button (program/continue)
This button is used to select either the continuous play or
program play mode.
The mode changes each time the button is pressed
The continuous play mode is automatically selected when the
power is switched on
Display section
® Skip buttons (<4 skip PP!)
Press one of these buttons briefly to move the pickup
(backward and forward) to the beginning of a specific track
Pickup:
The pickup is a laser device that reads the information on
the disc surface. The pickup moves across the disc as the
disc is played, but it is not visible from outside the cabinet j
J
Disc indicators (<<. ~ «»)
The indicator corresponding to the disc being played flashes
during play
When the unit is in the program mode, these indicators show
the programmed discs.
@ Disc number/tape side display (disc)
Shows the number (1~5) of the current disc, or shows the
tape side (A or B) in the edit mode.
Track number display (track)
Shows the number (up to 99) of the current track
Time/programmed number display
(No., min, sec)
This display shows the elapsed playing time of the track being
played. When the unit is in the program play mode, this
display shows the program sequence.
@ Program play indicator ({program))
Hluminates when the unit is in the programming or program
play mode.
@) Compact disc edit indicator (
® ©
@) Random indicator ({random!
Mluminates when the random play mode is selected
@ Repeat indicator ([@5))
lluminates when the repeat mode is activated
llluminates when the edit mode is activat
@ Auto link indicator ((link])
Iluminates when the unit is in the condition that the automatic
disc link is possible.
Pause indicator (If)
luminates when the pause mode is activated.
Play indicator (>)
Iltuminates when the play mode is activated
n
i
0
2)
N
a

li PLAYING A DISC
| Continuous play {from the stop mode)
Continuous play refers to play of the first track of the first disc to the last
track of the last disc.
2 Open the dust
cover.
3 Load disc(s) on
the disc tray(s).
1 Press the power switch to turn on (M_. =).
The disc trays turn clockwise, and the disc 1 tray resets to the
front position
Continuous play is automatically selected when the power is
switched on. If the program play indicator is illuminated,
press the program/continue button
Disc indicators
al LILI
track
| <> <ap aap <a ae! 7) 7) i ms a i |
|
H i
Nh
Open the dust cover.
wo
Load the disc(s) on the disc tray(s).
®Continuous play begins from disc 1 when the play button is
pressed.
¢For loading disc 5, press the disc skip button or turn the disc
trays manually.
Notes:
*Do not touch the disc tray while rotating.
*During play, other discs can be changed.
¢Discs of the 8 cm (3”) size and 12 cm (5") size cannot be used
together on the same number disc tray.
The disc skip button cannot be used during program play.
if intermittent noises are produced while the carousel is rotating,
this means that the lock shaft is not released. Set the power
switch to off and release the shaft according to the procedure on
page 2.
program/
continue
pause
4 Press the play button to start play.
The play indicator will illuminate and continuous play will start.
The indicator corresponding
to the disc being played flashes.
SE BN ARE ee ! mer
7s t tee tnt
wack min tor
Play indicator
At the end of the last track of the last disc, the unit switches to
the stop mode
To briefly interrupt play
Press the pause button.
The unit switches to the pause mode and the pause indicator
illuminates.
Press the play button to resume play.
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.
To stop play
Press the stop button.
Stop mode:
in the stop mode the pickup is at its rest position; the disc
does not rotate, and the display will show all zeros.
Continuous play continues
G29d° 1S
To select the desired track (or disc) to be played (trom the stop mode or during play)
By selecting the disc or track to be played first in the play
sequence, al! subsequent tracks will be played on that disc(s) in
order from that track to last. (There is no need to press the play
button.)
1 Press the disc select button.
If the disc only is selected, play of ati tracks on that disc
(beginning from its first track) will begin in about ten seconds.
For example: To select the 3rd disc, press the [3 ] button
The selected disc indicator will flash
2 Press the skip ([=1]) button to select the
track number.
Play will start from the selected track
For example: To select the 9th track, press the (-=1} button
8 times (or keep pressing the button until the
display shows “ 9").
Track number
If you go past the desired track, press the [=] button to
return to the desired track.
disc
a
2 Numeric buttons
e
3 Numeric buttons
@ By the remote control transmitter
(See page 7.)
1 Press the disc button.
2 Press the numeric button ((1)}-(5]) to specify
the disc.
3 Press the numeric button to specify the track.
Play will start from the selected track
To select the 10th and subsequent tracks
Press the [+10 button to select the “tens” digit, and then
press (one of) the [6}-{9] buttons to select the “units” digit
Example: to select the 32nd track
Press the(~10|button three times to select 3, and then press
the [2] button.
eSteps 1 and 2 are not necessary if the track is specified on
the 1st disc.
Notes:
elf a disc number not on the disc tray is specified, the next higher
number disc will be played.
When a track number not on the disc is specified, the selection
cannot be entered.

Prog ram play (from the stop mode}
As many as 32 selections from the five discs can be selected and
programmed to play in any desired sequence.
program/
1 continue
Program/
continue
5 Repeat steps
2,3 and 4as
desired.
3 Select the track number.
1 Press the program/continue button.
NI The piay mode will then change from continuous play to
Program play For example: To select the 9th track, press the (1) button
|
9
times.
Specified
track
number
eeocenm
im
|
xe
=
a
=
tt
te
ee
ive
LT
sen
no
Dina
+
a
Program play indicator
Note: 4
The mode does not change if the program/continue button is
pressed during play.
Press the program/continue button.
Programmed order
2 Press the disc select button.
For example: To select the 3rd disc, press the GG] button. = =
pier aise number 5 Repeat steps 2, 3 and 4 until the desired
program is completed.
=_ ac fi Steps 3 and 4 are not necessary if selecting the disc only.
¢ rt t Step 2 is not necessary to select the disc number if the next
Sh aachale: track selected is on the same disc.
ie a ie
Note:
If selections of non-existing disc(s) or track(s) are pro-
grammed, the corresponding indicator (disc or track) will
illuminate and the selection will be included in the program
count. However, during play the selection(s) will be cancelled
and the subsequent program selection will be played.
Note:
If the disc only is selected, all tracks on that disc (beginning
from its first track) wilt be programmed.
6 Press the play button to start play.
M@ REMOTE CONTROL TRANSMITTER
| Insertion of remote control transmitter batteries
BATTERY LIFE: About 1 year.
Use two UM-4,
AAA’ (RO3) size
(1.5 V) batteries.
@ Notes concerning use of dry bat-
teries
®Do not use re-chargeabie batteries (Ni-Cd type)
Be sure the batteries are inserted so that the
positive (+) and negative (--} polarities are
correct. Batteries installed with incorrect polar-
ities may leak and damage the remote control
transmitter.
Never subject the batteries to excessive heat or
flame; do not attempt to disassemble them: and
be sure they are not short-circuited
elf the remote control transmitter is not to be used
for a long time, remove the batteries and store
them in a cool dark place.
¢Always 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)
*Aithough battery life varies depending on how
often the remote control transmitter is used, the
batteries should be repiaced about once every
year on the average.
eThe batteries should also be replaced if com-
mands from the remote contro! transmitter are
not received by this player even when the
transmitter is held close to the players front
panel
elf the batteries teak, clean the battery holder well
before inserting new batteries
Do not use remote control transmitter for TV
sets, VTRs or other components at the same
time as this player's remote control transmitter
since this could result in a mistaken operation
Remote control transmitter 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 6 meters.
a -
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.
This unit
Avoid dust
_
Note: The control panel of the remote control transmitter may be covered by a clear plastic protective sheet. This sheet may be removed if desired
Remote functions
@ On the remote contro! transmitter only.
Stop button (™@ stop)
©) Search buttons (4< search >P)
@ Disc button (disc)
@ Numeric buttons (1~9, 0, +10)
@ Clear button (clear)
@ Recall button (recail)
Remote control signal transmission window
(11) Pause button (#1 pause)
42) Play button (> play)
(15) Skip buttons ( <4 skip >P )
(14) Program/continue button
(program/continue)
(5) Time mode select button
(time mode)
(3) Random button (random)
(4) Repeat button (repeat)

SS MS od OP)
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.
Clip Shorting pin
So, be careful of electrostatic breakdown during repair of the optical pickup. Ces > preeeeres
¢ Handling of optical pickup
1. Do not subject the optical pickup to static electricity as it is
extremely sensitive to electrical shock.
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
© Grounding for electrostatic breakdown prevention
1. Human body grounding
Use the anti-static wrist strap to discharge 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 is placed, and ground the
sheet.
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
@ INSTRUCTIONS FOR TRAVERSE OIL (Part No. $ZZ0L31)
The container contains 6g (approx. 3ml) of oil.
One application (one shaft) uses 0.05mi of oil.
How to Use
(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
the optical pickup and insert it into the bearing
while rotating it slowly.
(4) After securing the guide shaft, move the optical
Pickup by hand several times to the left and right
to distribute the oil on the guide shaft.
Be sure to short this position
(Use the shorting pin or clip.)
Optica! pickup
Lens (Do not touch)
FPC board
(Handle it carefully)
Variable resistor (Do not turn)
Wrist strap
(Anti-static bracelet)
tron plate or some metals
to conduct electricity
a7
Optical pickup
Guide shaft
“ATTENTION SERVICER”
Some chassis components may have sharp edges.
Be careful when disassembling and servicing.

ss] ed O40)
Mi DISASSEMBLY INSTRUCTIONS
Warning: This product uses a laser diode. Refer to caution statements on page 3.
ACHTUNG: _ «Die lasereinheit nicht zerlegen.
¢ Die lasereinheit darf nur gegen eine vom hersteller spezifizierte einheit ausgetauscht
werden.
* This CD player is equipped with FPC boards, so handle them with care during disassembly and reassembly.
Removal of the bottom cover
eRemove the 7 screws (O~@).
oF
1 the arrow.
Dust cover
Bottom cover
Removal of the power source P.C.B.,
power transformer and power switch
rod
4. Remove the power switch rod by using a
screwdriver.
5. Unsolder the terminals of the power
transformer.
Procedure | 14. Remove the 3 screws (O~®). Note: Set the power switch to the “OFF”
2-3 2. Remove the 1 connector (CN1). position.
3. Remove the power source P.C.B. in the
direction of the arrow.
Power
transformer
Unsolder the
terminals
Procedure
2-4
Hi Removal of the operation P.C.B.
1. Remove the 6 screws (9~@).
2. Remove the 2 connectors (CN1,
CN301).

ss) I O45)
Removal
of
the
line
out
jack
P.C.B.
Removal
of
the
clamp
cover
(0)
Procedure
|
4.
Remove
the
1
screw
(@).
Procedure
|
1.
Release
the
2
claws.
2-5
2.
Remove
the
1
connector
(CN801).
1-2-6
2.
Remove
the
clamp
cover
in
the
direction
of the arrow.
Removal of the clamp chassis
Mbpeeta 4. Remove the 3 screws (0~®).
Procedure
1-2-6
e Release the 3 claws.
Procedure
12-6 2. Remove the disc tray in the direction of
the arrow.
Yoke
Magnet
= 10 =

eee Removal of the loading chassis Removal of the servo P.C.B.
Procedure
|
1.
Remove
the
7
screws
(O~@).
Procedure
°
8-10
2.
Remove
the
2
connectors
(CN301,
8-10-11
CN451).
Servo P.C.B.
SS Spindle motor terminals
1. Remove the 3 screws (O~®).
2. Unsolder the 2 terminals of spindle motor.
3. Remove the FPC board from the optical pickup.
Caution: To prevent the breakdown of the laser
diode, antistatic shorting pin is inserted
into the FPC board.
eae Removal of the optical pickup aa Removal of the loading motor
Procedure Procedure
8-10-12 8-10-13
Refer to the handling precautions for |
optical pickup and instructions for |
| traverse oil (See page 8).
. Remove the drive belt.
. Remove the 3 screws (@~®).
. Release the 2 claws.
. Unsolder the 2 terminals of the loading
motor.
PON =~
1. Remove the 2 screws (@, @).
2.
Unsolder
the
2
terminals
and
the
2
screws
(@,
@).
ie
0)
y iN mS :
Drive belt
Unsolder
Caution:
Take
care
not
to
touch
the
brush
terminal.
ceed
aie
ee
minale
ee

SM od O45)
Removal of the sub button and main
button
Ref. No.
15
Procedure
24-15
Procedure
25-14
1. Remove the 2 screws (O, @).
2. Remove the sub button in the direction of
the arrow @®.
3. Remove the 2 screws (@, Q).
4. Remove the main button in the direction
of the arrow ©.
1. Remove the spring and lever.
2. Remove the 1 screw (@).
Spring
Lever
Sensor PC.B.
ae Removal of the spindle motor
Procedure
8-10-12
—16
1. Loosen the screw (@) by using a 1.27mm allen
wrench and remove the turntable.
2. Remove the 2 screws (Q, ®).
Caution:
1. Turntable height adjustment is necessary any time
the turntable or spindie motor is replaced.
2. The (+) terminal of the spindle motor is indicated
by
the
red
mark.
Spindle
motor
a aie of turntable height
. Insert a 0.9mm clearance gauge (RZZ0297)
between the turntable and loading base as shown (+) Terminal
in the figure. Red mark
2. Tighten the turntable set-screw by using a 1.27mm
allen wrench.
Caution:
Refer to turntable height adjustment (See page 16).
Turntable
0.9mm clearance
Cl
AUIMULINL,
eg
gaug
e
(
(R
22029
7)
Spindle a.
2 ove

SL-PC25
ne
How
to
check
the
main
P.C.B.
-—
Procedure
1--2--6-7
89-17
e¢When checking the foil side of the main P.C.B. and
replacing the parts, do as shown here.
Main P.C.B.
>< Use rods or similar object to hold the
main P.C.B. in an upright position.
M@ MEASUREMENTS AND ADJUSTMENTS
Warning: This product uses a laser diode. Refer to caution statements on page 3.
Caution: During adjustment, never connect CH-2 probe’s GND to any place for it may short Vref line.
(Connect CH-1 probe’s GND to specified TP. described in each section.)
PREPARTION
. Remove the dust cover (refer to disassembly instruction
Ref. No. 1).
. Remove the bottom cover (refer to disassembly instruction
Ref. No. 2).
. Remove the clamp cover (refer to disassembly instruction
Ref. No. 6).
. Remove the clamp chassis (refer to disassembly instruc-
tion Ref. No. 7).
Set the power switch to ON.
. (1) The carousel rotates clockwise and stops at the fifth Test disc
tray.
(2) Set the power switch to OFF and then to ON again,
when the optical deck reaches it’s height position, set
the power switch to OFF.
. Remove the disc tray (refer to disassembly instruction Ref.
No. 8).
. Place the test disc and secure it by using the magnet (refer
to disassembly instruction Ref. No. 9). Power Switch
. Set the unit in the test mode as follows:
(hold the play, stop and disc 1 keys (3 keys) on and set the
power switch to ON.
. Follow the adjustment procedure.
Magnet
means kee

Sy od OF As)
NEW SERVO GAIN ADJUSTER (Servo Amp. Adjusting Fixture)
The following introduces the improved version of the current servo gain adjuster (SZZP1017F):
Part number: SZZP1094C—1
Features:
(1) Contains all oscillation frequencies and output adjustments needed for focus servo gain, tracking servo gain,
and tracking balance adjustment (requires no external oscillator).
(2) Panel indicators indicate the best points of focus and tracking servo gains (no oscilloscope needed).
(3) Internal power supply eliminates the need for power supply from the CD player.
Power cord 8)
Servo gain indicator
Test connector
? (to CN102)
Oscillation 2 ya
level
adjustment
A
GND
(to
chassis)
(0.1~0.6 Vp-p)
Oscillation frequency adjustment
750 Hz
1,000 Hz Oscillation
1,200 Hz frequency
1,500 Hz multiplier
x1
Tracking On/Off (Normally use at On.)
X1.1 it Sh ;
ON: Servo circuit active.
OFF: Servo circuit inactive.
Power switch
Mode selector:
1. Tracking Servo Gain, Tracking Balance
2. Defeated
3. Focus Servo Gain
reversed, Refer to respective Service
( With some modets, positions 1 and 3 are
Manual for the switch position. )
— 14—

NS} i od OF 46)
ADJUSTMENT POINTS
e Servo P.C.B.
Focus offset adj. aa 9aiN/ Tracking offset adj.
Wis
NS
S
aun
Tracking balance adj. Tracking gain adj.
RF output Best eye adj.
Adjusting fixture
@ Main P.C.B. (Power supply for SZZP1017F only.)
© (-12.1V)
(‘ecw the blue
se)
a oO
read wire of servo es: |
gain adjuster.
@ (+11.2V) /
Connect the red lead
wire of servo gain
adjuster.
* Temporary setting of each VR
Temporary VR setting if any of the trimmer
VRs are replaced or require readjustment,
temporarily set them to the following positions:
SagaEE
—~ 15 —

NS) Ed O45)
Measuring Instruments and Special Tools
* Servo gain adjuster (SZZP1017F or SZZP1094C—1)
Test discs
. Playability test disc (SZZP1054C or SZZP1014F)
. Uneven test disc (SZZP1056C)
. Black band test disc (SZZP1057C)
Normal disc
Dual-beam oscilloscope with bandwidth of 30 MHz or
better (with EXT trigger and 1 : 1 probe).
Audio frequency (AF) osillator
Comversion connector (SZZP1032F)
¥¥ WD = ¥
* *
Audio frequency oscillator
©OO9O
9 9
Servo gain adjuster
(SZ2ZP1017F) GND OSC
@® ON/OFF switch ®
iN
di GND®
Selector
Oscilloscope Oscilloscope connection
0_0 terminals
wn
ovo
TP2 TP3TPI
CHI rCH2 4
G JCH1 ©
(-12.1V) GND (+11.2V)
(Main) (Chassts) (Main)
(See page 15.)
Adjusting Procedure
* If you have replaced the optical pickup, spindle motor,
or turntable, do the following adjustment:
(1) TURNTABLE HEIGHT ADJUSTMENT
1. Insert the 0.9 mm clearance gauge (RZZ0297) between
the turntable and the loading base (see the figure at
right).
2. Tighten the turntable retention screw with the 1.27 mm
allen wrench.
3. Connect the oscilloscope’s CH. 1 probe across VR104's
(+) and VR106's (—) terminals via
a filter.
(Note:
A
voltage
of
2.5V
appears
at
the
V.
REF
terminal.
Take care not to short the player's chassis to the oscil-
loscope ground.)
Oscilloscope setting: VOLT.......... 50 mV
SWEEP oe has dds Tms.
Input coupling... DC
4. Adjust oscilloscope’s DC zero balance.
5. Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
6. Measure the voltage amplitude of the signal on the
oscilloscope.
Note 1. If the measured amplitude is within a range of +/—
15 mV, the turntable height is correct. If it is outside
this range, adjust the turntable height by using the
clearance gauge as a pry.
If the amplitude exceeds +15 mV, lower turntable.
If the amplitude is below —15 mV, elevate the turntable.
Connection of servo gain adjuster (If you use SZZP1094C, refer to included operating instructions.)
Oscillator connection terminals
* Allen wrench (M2.0) (SZZP1101C)
* Allen wrench (M1.27)
* 0.9mm clearance gauge (RZZ0297)
* Filter
Perform adjustments depend on the part to be replaced
according to followings:
(1) Spindle MOtOr 0.0... cece ecccceeseetteseaeseeees Items 1,3 to 8
(2) TURN tal Ooi, cece sess sais od: dete, tosdédidicceeeeeesse es Items 1,3 to 8
(3) Optical PiCkUP....... ce cee ceccceeceessseeeenees Items 2 to 8
Conversion connector
(SZZP1032F)
To CN102
Turntable
Clearance gauge
(RZZ0297)
rosea sseee 0.9mm
OM dh
WS
Deerscsscssesses: W ts 33
Spindle motor
Note 2. If the measured amplitude greatly surpasses or
falls short of the range above, set VR105 at or around
the center, then try to adjust the height again. (Then
be sure to adjust the focus offset as well.)
Oscilloscope
eFilter for turntable height adjustment
Resistor: ERDS2TJ103 (10kQ)
Capacitor: ECQV1H104KV (0.1 uF) n0ee
2416

SL-PC25
MECHANICAL ADJUSTMENT
1. Connect the oscilloscope’s CH. 1 probe across
(+) and (—) on the Servo P.C.B.
Oscilloscope setting: VOLT.......... 100 mV
Input coupling...
2. Switch the player power ON, and play track 9 on the
test disc (SZZP1056C). (Playing any other track may
yield a false adjustment.)
3. Leave the player in Play mode, and place it as shown
in the figure on the right.
4. Alternately adjust the two mechanical adjusting Ue hameat -adivstiment
screws with the 2.0mm allen wrench (SZZP1101C)
until the vertical fluctuation of RF signal is
minimized and the eye pattern is most stretched.
5. After completing the adjustment, lock the mechanical
adjustments with lock paint (RZZOLO1).
Allen
wrench
Range adjustable
with a allen
wrench.
x eet RAY 29.0. 9-9 -9-9~
aint
HEROD
52 ace: SLE SL aes
% Most stretched eye pattern.
(3) BEST EYE (PD BALANCE) ADJUSTMENT
1. Connect the oscilloscope’s CH. 1 probe across BUMRIth)
(+) and Bueteyy (—) on the Servo P.C.B.
Oscilloscope setting: VOLT.......... 100 mV
) A aint
OOK
OS
Input coupling... AC
2. Switch the player power ON, and play the 1kHz
(track 1) on the test disc (SZZP1054C).
3. Adjust VR101 until the vertical fluctuation of RF
signal is minimized and the eye pattern is most
stretched.
* Most stretched eye pattern.
ag
ae yee

5) od O45)
on
(5)
FOCUS GAIN ADJUSTMENT
. Connect the servo gain adjuster to the player (see page
15).
Set the servo gain adjuster’s gain switch to position “2”
and the ON/OFF switch to ON.
Set up the AF oscillator output for 825Hz, 150 mVp-p,
and connect it across the OSC and GND terminals on the
servo gain adjuster.
Connect oscilloscope’s CH. 1 and CH. 2 probes to the
servo gain adjuster’s TP1 and TP2 terminals, respectively
(TP3 is GND).
Oscilloscope setting: VOLT .......... 100 mV
(both channels)
SWEEP......... 0.2 ms.
Input coupling... AC
. Play the test disc (SZZP1014F or SZZP1054C).
. Set the servo gain adjuster’s gain switch to position ‘’3”,
and you will see a 825 Hz signal on the oscilloscope.
Adjust VR104 until the signal amplitudes on both
channels become identical to each other.
. Set the gain switch back to position “2”.
TRACKING GAIN ADJUSTMENT
. Set up the AF oscillator output for 1.1 kHz, 150 mVp-p,
and connect it across the OSC and GND terminals on the
servo gain adjuster.
Connect oscilloscope’s CH. 1 and CH. 2 probes to the servo
gain adjuster’s TP1 and TP2 terminals, respectively
(TP3 is GND).
Oscilloscope setting: VOLT.......... 100 mV
(both channels)
SWEEP......... 0.2 ms
Input coupling... AC
Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
Set the servo gain adjuster’s gain switch to position “1”,
and you will see a 1.1 kHz signal on the oscilloscope.
Adjust VR102 until the signal amplitudes on both
channels become identical to each other.
. Set the gain switch back to position “2”.
(6) FOCUS OFFSET ADJUSTMENT
Note: Make sure that the servo gain adjuster’s gain switch
is set to position “2”.
1. Connect the oscilloscope’s CH. 1 probe across QR MIU
(+) and QypREa (—) on the Servo P.C.B. and its CH. 2
Probe (+) to VR104’s terminal.
Oscilloscope setting: VOLT.......... 100 mV (CH. 1)
100 mV (CH. 2)
SWEEP......... 0.2 ms.
Input coupling. .. AC (both CH. 1
and 2)
Trigger mode... .NORM (trigger
CH. 1.)
Switch the player power ON, and play track 9 on the
test disc (SZZP1057C).
Trigger the oscilloscope’s CH. 1 so that the following
cae Cars fonts a
LSTA AR WIA LC |
\
A
f\
M
y/
\
Fa
IN
a
WV VV WAVY
re
a
4
Ry
"
A
Be
Ws
‘
iN
i
W\
f
1
fr
tt
b
Ww
VW
VV
y
iY V7
9)
Vi
4
W
*
Adjust
VR104
until
a
equals
b.
a
b
X Adjust VR102 until a equals b.
cu
lt
mame
UL
UP
EU
Bd
ae
al a
Oe gees tales
Minimize the amplitude or make A = B.
waveforms are observed. Adjust VR105 until the dip in Smooth
the RF signal envelope on CH. 1 is smooth and the signal
amplitude on CH. 2 is minimized, i.e. when amplitude A
equals amplitude B.
= 48
envelope

(7)
TRACKING OFFSET ADJUSTMENT
Note: Make sure that the servo gain adjuster’s gain switch
1.
a
(8)
_
ND
No *
*
NO —
o
is set to position “2”,
Connect the oscilloscope’s CH. 1 probe across
(+) and (~) on the Servo P.C.B., and its
CH. 2 probe (+) to VR102's terminal.
Oscilloscope setting: VOLT......... 100 mV (CH. 1)
100 mV (CH. 2)
SWEEP........ 0.2 ms.
input coupling. . AC (both CH. 1
and 2)
Trigger mode. . ae (trigger
CH
Switch the player power ON, and play pone 9 on the
test disc (SZZP1057C).
Trigger the oscilloscope’s CH. 1 so that the following
waveforms are observed. Adjust VR103 until the dip in
the RF signal envelope on CH. 1 is smooth and the
signal amplitude on CH. 2 is minimized, i.e. when
amplitude A equals amplitude B.
TRACKING BALANCE ADJUSTMENT
. Make sure that the servo gain adjuster’s gain switch is
set to position “2”.
. Set up the AF oscillator output for 1.1 kHz, 600 mVp-p,
and connect it across the OSC and GND terminals on the
servo gain adjuster.
Connect the oscilloscope’s CH. 1 probe across §URAI
(+) and (—) on the Servo P.C.B. and CH. 2 probe
(+) to the OSC terminal on the servo gain adjuster.
Oscilloscope setting: VOLT......... 100 mV (CH. 1)
200 mV (CH. 2)
SWEEP........ 0.1 ms.
Input coupling. .AC (both CH. 1
and 2)
Trigger mode .. .NORM (trigger
CH, 2)
. Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
CHECK OF PLAY OPERATION AFTER ADJUSTMENT
Checking Skip Search
Play an ordinary musical program disc.
Press the skip button to check for normal ‘skip search
Operation (in both the forward and reverse directions).
Checking Manual Search
. Play an ordinary musical program disc.
Press the manual search button to check for smooth
manual search operations at either low or high speed
(in both the forward and reverse directions).
SL-PC25
| rere
fect
A
ti!
-
rem
_
nit
iti
(tl
vin
ui
lla
I
ul
CHi
Minimize the amplitude or make A = B.
Smooth
envelope
5. Set the servo gain adjuster’s gain switch to position
“4” and adjust VR106 so that the wafveform of the
output section marked with >x is balanced.
6. Disconnect the servo gain adjuster’s leads from the
player.
= *
nm
— 19 —
eRe SReEe
(Mill ii i
Oi
ATataeralte Wen tas
MH | {UN | pu |
alla
wey
Ps
ni
PAPA
Ie
xX This section of the waveform must be
balanced.
A
Checking Using Defect Disc
Play the 0.7 mm black dot and the 0.7 mm wedge on the
defect test disc (SZZP1054C) and verify that no sound
skip or noise occurs.
Play the middle tracks of the uneven test disc and verify
that no sound skip or noise occurs.

SL-PC25
@ TERMINAL FUNCTION OF IC’S
e
1C101
(AN8373S):
Servo
amp.
ome | etn
Division
1
2
3
4
5
6
7
8
RF signal input (X30 amp.)
PDAD | Photo detector current input (A2)
PDA Photo detector current input (A1)
PDBD I Photo detector current input (A4)
PDB | Photo detector current input (A3)
LPD | Non-inverting laser power input
Laser power auto control output
PD balance adjustment
Tracking balance adjustment
ae
12 FOOFS ( Focus offset adjustment
15 FE [@) Focus gain adjustment output
16 FPI | Focus error signal input
TP I Tracking error signal input
Tracking error filter capacitor
input
Focus error filter capacitor input
Pin 1/0
TPO oO Tracking error signal output
23 FPO oO Focus error signal oytput
Focus gain up signal input
sai locks (Not used, connected to GND)
25 tcc | Tracking gain up signal input
(Not used, connected to GND)
26 GD \ Focus/Tracking down signal input
(Not used, connected to GND)
27 PTO oO Position detecting amp. output
PTI | Position detecting amp. input
PBO oO Position detecting buffer output
POT t Position detecting buffer input
BDO oO Dropout detection output
RFDET O RF detection signal output
SDO oO Dropout detection pulse output
Cc. SBDO i Dropout detecting capacitor input
35 ARF O RF signal output
36 Cc. AGC | AGC detecting capacitor input
3 Vcc Power supply (+5 V input)
38
39
L
Laser power control input
FIN RF signal input
MPO RF signal output
VREF Reference voltage output
PIDicr
ie)
{e)
2
GND Ground terminal
= "90 =