Panasonic SLCT570 - PORT. CD PLAYER User manual

ORDERNo. AD9912264C3
PortableCD Player
SL-CT570
Traverse Deck: RAE0220Z Mechanism Series
Colours
(S)............Silver Type
(A)............Blue Type
Areas
GK...........China.
GH...........Hong Kong.
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SPECIFICATIONS
Specification
Audio(Anti-shock off)
No. of channels: 2 channels(left and right,
stereo)
Frequencyresponse: 20 to20,000 Hz (+0.5dB, -
1.5dB)
Output voltage: 0.6V (50k )
S/N: more than96 dB
Wowand flutter: Belowmeasurablelimit
DAconverter: 1 bit, MASH
Headphones output level: Max. 9mW+9mW/ 16 /
(adjustable)
Pickup
Light source: Semiconductorlaser
Wavelength: 780 nm
General
Operational temperature range: 0°C-40°C
Rechargeabletemperature range: 5°C-40°C
Power supply DC 4.5V
Power consumption
Power source ANTI-SHOCK MEMORY II
OFF/ ON
AC adaptor 2.4W/ 2.4W
Battery(DC 3V) 0.47W/ 0.52W
Whenrecharging: Approx. 5.1W
Playtime
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[Whenusedinholdmode, at 25°C (77°F) temperature and on
flat
and stablesurface]
Batteries used ANTI-SHOCK MEMORY II
OFF/ ON
2”AA” (LR6) alkalinebatteries About 24h/ 30h
2“AAA” (LR03) alkaline About 10h/ 13h
batteries
Ni-MH Rechargeablebatteries About 6h/ 8h
4alkalinebatteries About 38h/ 50h
2rechageableand 2alkaline /
batteries About 30h/ 38h
Theplaytime maybeless depending on theoperating
conditions.
Recharging time: About 3h
Dimensions(WxHxD) 128x20.8x131mm
Weight: 191g(withbatteries)
169g(without batteries)
Notes:
Specificationsare subject tochangewithout notice.
Weight and dimensionsare approximate.
1999 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution isaviolation of law.
1. Precaution of Laser Diode
CAUTION:
Thisproduct utilizes alaser diode with the unitturned “on”,
invisiblelaser radiation isemitted from the pickup lens.
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Wave length: 780nm
Maximum output radiation power from pickup: 100 W/VDE
Laser radiation from the pickup lens issafetylevel, but be sure the
followings:
1. Donot disassemblethe optical pickup unit, since radiation from
exposed laser diode isdangerous.
2. Donot adjust the variableresistor on the pickup unit. Itwas
alreadyadjusted.
3. Donot look at the focus lens using optical instruments.
4. Recommend not to look at pickup lens for along time.
ACHTUNG:
Dieses Produkt enthalteine Laserdiode. Imeingeschalteten
Zustand wird unsichtbare Leserstrahlung von der Lasereinheit
abgestrahlt.
Wellenlage: 780nm
MaximaleStrahlungsleistung der Lasereinheit: 100 W/VDE
DieStrahlung an der Lasereinheitist ungefahrlich, wenn folgende
Punkte beachtet werden:
1. DieLasereinheitnicht zerlegen, da dieStrahlung an der
freigelegten Laserdisde gefahrlich ist.
2. Den werkseitigjustierten Einstellregler der Lasereinhitnicht
verstellen.
3. Nicht mitoptischen Instrumenten indieFokussierlines blicken.
4. Nicht uber langere ZeitindieFokussierlines blicken.
ADVARSEL: I dette a apparat anvendes laser.
2. Accessories
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-AC adaptor..................................................................1pc.
(RFEA403H-S)
-Wired remote control..................................................1pc.
(RFEV027P-SS)
-Batterycase................................................................1pc.
(RFA1139-H)
-Stereo earphones......................................................1pc.
(RFEV319P-SA)
-Rechargeablebattery................................................1pc.
(RFKFHHR4AHBA)
-Batterycarrying case.................................................1pc.
(RXQ0449)
-Soft case.....................................................................1pc.
(RFC0041-K)
3. Location of Controls
4. Handling Precautions for Traverse Deck
The laserdiode inthe traverse deck (optical pickup) maybreak downdue topotential difference
causedbystatic electricityof clothes orhumanbody.
So, be careful of electrostatic breakdownduring repairof the traverse deck (optical pickup).
4.1. Handling the traverse deck (optical pickup)
1. The traverse deck (optical pickup) isan extremelyhigh-precision
construction and must not be subjected to impact, excessive
vibration, or other types of rough handling.
2. Inorder to prevent staticelectricitydamage to the laser diode, use
ashort pinor similar tool to short the optical pickup’sflexible
circuitboards after theyhave been disconnected from the main
circuitboard.
3. Handlethe flexiblecircuitboards with care; excessive force could
cause them to be broken.
4. Donot turn the pre-set variableresistor (for adjustment of the
laser power); ithas been adjusted at the factory.
(as shownin Fig.1 )
Fig.1
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4.2. Grounding for electrostaticbreakdownprevention
1. Human bodygrounding
Use the anti-staticwrist strap to discharge the staticelectricity
from your body. (as showninFig.2 )
2. Work tablegrounding
Put aconductive material (sheet) or steel sheet on the area where
the optical pickup isplaced, and fround the sheet. (as shownin
Fig.3 )
Caution
The staticelectricityof your clothes will not be grounded through
the wrist strap.
So, take care not to let your clothes touch the traverse deck (optical
pickup). Fig.2
Fig.3
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5. Operation Checks and Component Replacement
Procedures
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8

9

10

11

6. Checking the Operation Problems on the Traverse
Deck (Optical Pickup)
Make sure tofollowthe procedures belowtocheck the operation problems of the traverse deck
(optical pickup) before replacing it.
Replace the traverse deck onlyafterthe problemis identified.
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Check the operations describedbelowon the traverse deck afterreplacing it.
*Checking SkipSearch
1. Playan ordinarymusical program disc.
2. Press the skipbutton to check for normal skipsearch operation
(inboth the forward and reverse directions).
*Checking Manual Search
1. Playan ordinarymusical program disc.
2. Press the manual search button to check for smooth manual
search operations at either low or high speed (inboth the forward
and reverse directions).
*Checking Playability
1. Playthe 0.7mm black dot and the 0.7mm wedge on the
playabilitytest disc (SZZP1054C)and verifythat no sound skipor
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noise occurs.
2. Playthe middletracks of the uneven test disc (SZZP1056C)and
verifythat no sound skipor noise occurs.
7. Automatic Adjustment Results Display Function
(Self-check Function)
Onthis unit (SL-CT570), eachautomatic adjustment results are displayedon the LCD. This
function is convenient tocheck oridentifywhichautomatic adjustment circuit is incorrect. The
followings are the contents of the automaticadjustment result displays (self-check function).
(Using the newServoIC: MN662784SA)
7.1. How to displayautomaticadjustment results
1. Load the test disc (SZZP1054C).
2. Press the (SKIP/SEARCH)and (SKIP/SEARCH)Buttons
simultaneouslyand holdthem, and additionallypressthe
(PLAY/PAUSE) Button.
3. Press the (OPROFF) Button once.
4. Anautomaticadjustment resultisdisplayed on the LCD.
7.2. Displayof automaticadjustment results (self-check function)
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<Example>
Followthe belowsteps when“E-1” is displayed.
(Cause: Focus balance (FBC) is set beyond the limit.)
Check if
(1) the waveform orvoltage of the focus servocircuit is correct. (check the waveform orvoltage.)
(2) the optical pickup returns tothe normal state byexchanging the traverse deck.
Followthe belowsteps when“E-4” is displayed.
(Cause: Focus gain(FGC) is set beyond the limit.)
Check if
(1) the waveform orvoltage of the focus servocircuit is correct. (check the waveform orvoltage.)
(2) the focus coil of the optical pickup is correct (around 15 ohms).
(3) the optical pickup returns tothe normal state byexchanging the traverse deck.
Followthe belowsteps when“E-F” is displayed.
(Cause: All adjustments (TGC, FGC, TBC, FBC) are set beyond the limit.)
Check if
(1) the optical pickup returns tothe normal state byexchanging the traverse deck.
(2) the waveform orvoltage of the servoIC’s are correct. (check the waveform orvoltage.)
Note:
It is not always necessarytoexchange the traverse deck whenanerrormessage is displayed.
Be sure tocheck if the circuit is defective ornot before exchanging the traverse deck.
Note:
If anyotherdisc thanthe test disc (SZZP1054C) is used, anerrormessage maybe displayed.
This is not a malfunction.
8. Measurements and Adjustments
Warning:
This product uses a laserdiode. Refertocaution statements.
ACHTUNG:
-Dielasereinheitnicht zerlegen.
-Dielasereinheitdarf nur gegen einvom hersteller spezifizierte
einheitausgetauscht werden.
Measuring instruments and special tools
-Test discs
1. Playabilitytest disc (SZZP1054C)
2. Uneven test disc (SZZP1056C)
-Musical program disc (ordinary)
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-DC voltmeter
-Lead wire (for test points)
Test short land
Short-circuit the lands of the laserON/OFF swtch(S201) bysoldering them. It turns “ON”
position. (Refertobelowor“12. PrintedCircuit Boardand Wiring Connection Diagram” for
shortland location)
Note: Remove the solders fromthe short lands afteradjustment.
Adjustment point
Notes:
1. Please refer to “12. Printed CircuitBoard and Wiring Connection
Diagram“ for test point locations.
2. Take care to connect CN101 and CN401. (as shownin Fig. 4 )
Fig. 4
8.1. Power SupplyVoltage Adjustment
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1. Connect the DC voltmeter to VDD(+)and GND on the P.C.B..
2. Connect the AC adaptor cord to the DC INport (or use the full-
recharged rechargeablebattery, anew articlebatteries) and load
the test disc (SZZP1054C).
3. Select the EQ keyin“OFF” position with the test disc isto be
playing bypressing the button. Next to it, press the (OPR
OFF) button and be inTOCreading situation.
4. Adjust VR11 on the P.C.B. at 2.45+/-0.02V (EQ switch in“Normal ”
position), as shownin.
8.2. Check of PlayOperation
*Checking SkipSearch
1. Playan ordinarymusical program disc.
2. Press the skipbutton to check for normal skipsearch operation
(inboth the forward and reverse directions).
*Checking Manual Search
1. Playan ordinarymusical program disc.
2. Press the manual search button to check for smooth manual
search operations at either low or high speed (inboth the forward
and reverse directions).
*Checking Playability
1. Playthe 0.7mm black dot and the 0.7mm wedge on the
playabilitytest disc (SZZP1054C)and verifythat no sound skipor
noise occurs.
2. Playthe middletracks of the uneven test disc (SZZP1056C)and
verifythat no sound skipor noise occurs.
9. Outline of 40-Second Sound Keeper Technique
Used for Prevention of Sound from Skipping
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9.1. Conventional Shockproofing Technique
(LCD Display: )
Input information readout of the CD at double speedis demodulated, storedinthe memory, and
while sound-marking signal is suppliedat normal speedfromthe memorytothe D/A converter,
the residual data is accumulatedinthe memory.
If reaccess tothe break point is accomplishedbefore the memorybecomes empty, apparent
playback sound is entirelykept free frombreaking evenwheninformation pauses due to
vibration, etc. It was necessarytouse the 16M bit memoryforsecuringthe accumulation time of
about 10 seconds.
9.2. Compression-shockproofing [Outline]
(LCD Display: )
Fig.5 is a block diagramshowing the compression-shockproofing mechanism, the difference of
whichfromthe conventional mechanismis as follows: Input information readout at double
speedundergoes datacompression (16 bits -- 4 bits) bythe encoderinthe ADPCM (Adaptive
Difference PCM) and storedinthe external memory; the storedmemoryinformation undergoes
data elongation (4 bits -- 16 bits) bythe decoderinthe ADPCM and suppliedat normalspeedto
the D/A converter.
The data compression technique has conducedtoreduction of requiredmemorycapacityfrom
16M bits to4M bits forsecuring the accumulation time equivalent tothe conventional.
Fig.5
10. Schematic Diagram Note
10.1. Type Illustration of IC's, Transistors and Diodes
10.2. SchematicDiagram Notes
Notes:
-S201: Laser ON/OFF switch in“OFF” position.
(Itturns “ON”with disc holder closed.)
-S202: Rest detector in“OFF” position.
(Itturns “ON”when optical pickup comes to innermost
periphery.)
-S309: Playmode selector (MODE) in“NORMAL” position.
(RESUME RANDOM NORMAL)
-S310: Hold(HOLD)switch in“OFF” position.
-S801: Play/pause ( ) switch.
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-S802: Stop/power off ( OPROFF) switch.
-S803: Repeat ( )switch.
-S804: 40sec. Anti-shock (ANTI-SHOCK MEMORYII)switch in
“OFF” position.
-S805: EQ slector (EQ)in“OFF” position.
-S806: Memory/recall (MEMORY/RECALL) switch.
-S807, 808: Skip/search ( , )
-S809: Residual batterydisplay(BATT CHECK)switch.
-VR11: Power supplyvoltage adjustment.
-VR701-1,2: Headphones volume (VOLUME) control.
-Components identified bymark have special characteristics
important for safety.
-When replacing anyof components, be sure to use only
manufacture’sspecified parts showninthe parts list.
-The supplypart number isdescribed alone inthe replacement
parts.
-Signal line
- : Positive voltage line.
- : CD playback signal line.
-The voltage value and waveforms are the reference voltage of this
measured byDC electronicvoltmeter (high impedance) and
oscilloscope on the basisof GND terminal (DC INJack).
Accordingly, there mayarise some errors inthe voltage valuesand
waveforms depending upon the internal impedance of the tester
or measuring unit.
Measurement conditions:
*AC adaptor isused for power supply.
*Set the headphones VR(VR701) to center position(No.5).
*( ).......CD playback mode (Test disc 1kHz, L+R, 0dB)
Set the holdunlock and ANTI-SHOCK switches to OFF.
*Nomark.......CD stop mode
Caution!!
-ICand LSI are sensitive to staticelectricity.
-Secondarytroublecan be prevented bytaking care during repair.
-Cover the parts boxes made of plastics with aluminum foil.
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-Ground the soldering iron.
-Put aconductive mat on the work table.
-Donot touch the pins of ICor LSI with fingers directly.
11. Schematic Diagram
12. Printed Circuit Board and Wiring Connection
Diagram
13. Block Diagram
14. Terminal Function of IC's
14.1. IC101(AN8839NSBE1): Servo Amplifier
Pin
No. Mark I/O / Division Function
1PDE I Tracking signal input (1)
terminal
2 PDF I Tracking signal input (2)
terminal
3 VDD I Powersupplyinput terminal
4 PDA I Focus signal input (1)
terminal
5 PDB I Focus signal input (2)
terminal
6LPD I APC amplifierinput terminal
7LD O APC amplifieroutput
terminal
8 RF O RFaddition output terminal
9 RFIN I RFdetection signal input
terminal
10 CSBRT I Capacitorconnection
terminal forOFTR
11 CEA I HPFamplifiercapacitor
connection input terminal
12 BDO O Dropout signal output
terminal
(H: dropout)
13 LDON I APC control input terminal
14 GND — ConnectedtoGND
15 /RFDET O RFdetection signal output
terminal / (L: detection)
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