Panasonic SA-PM28E User manual

Order No. MD0304130C2
CD Stereo System
SA-PM28E / SA-PM28EB / SA-PM28EG
Color
(S) ... Silver Type
SPECIFICATIONS
Specification
1

Amplifier Section
RMS Power output
10%Total harmonicdistortion
1kHz, bothchannelsdriven
(Lowchannel) 35 Wper channel (6)
8kHz, bothchannelsdriven
(High channel) 35 Wper channel (6)
Total Bi-Amppower 70 Wper channel
Input sensitivity
AUX 250 mV
Input impedance
AUX 11.8k
FM Tuner Section
Frequencyrange 87.50 - 108.00 MHz
(50 kHz steps)
Sensitivity 1.8V (IHF)
S/N 26 dB 1.5V
Antennaterminal(s) 75 (unbalanced)
AM Tuner Section
Frequencyrange 522 - 1629 kHz (9kHz steps)
520 - 1630 kHz (10 kHz steps)
Sensitivity
S/N 20 dB (at 999 kHz) 560 V/m
CassetteDeck Section
Track system 4 track, 2channel
Heads
Record/playback Solidpermalloyhead
Erasure Doublegapferritehead
Motor DC servomotor
Recording system AC bias 100 kHz
Erasing system AC erase 100 kHz
Tapespeed 4.8cm/s
Overall frequencyresponse (+3to-6dB at Deck Out)
Normal (TypeI) 35 Hz - 14 kHz
S/N 50 dB (Aweighted)
Wowand flutter 0.18%(WRMS)
Fast forwardand rewind times Approx. 120 secondswithC-
60 cassettetape
CD Section
Disc played
CD/MP3/WMA 8cm/12cm, CD-R/RW
Sampling frequency 44.1kHz
Decoding 16 bit linear
Pickup
Beam source/ Wavelength Semiconductorlaser / 780
nm
2

Number of channels Stereo
Frequencyresponse 20 Hz - 20 kHz (+1, -2dB)
Wowand flutter Belowmeasurablelimit
Digital filter 8 fs
D/Aconverter MASH (1bit DAC)
MP3
Bit rate 32kbps- 320 kbps
Sampling frequency 32 kHz, 44.1kHz, 48 kHz
WMA
Sampling frequency 32 kHz, 44.1kHz, 48 kHz
General
Power supply
ForEB only AC 230 - 240 V, 50 Hz
ForE & EG only AC 230 V, 50 Hz
Power consumption 130 W
Power consumption standbymode Approx.0.6W
Dimensions(WxH xD) 179 x247 x378 mm
Mass 5.4kg
System
System: SC-PM28 (E) MusicCenter: SA-PM28 (E)
Speaker: SB-PM28 (P)
System: SC-PM28 (EB) MusicCenter: SA-PM28 (EB)
Speaker: SB-PM28 (P)
System: SC-PM28 (EG) MusicCenter: SA-PM28 (EG)
Speaker: SB-PM28 (EG)
Notes:
1. Specificationsaresubject to changewithoutnotice. / Mass and
dimensionsareapproximate.
2. Total harmonicdistortion ismeasured bythedigital spectrum
analyzer.
2003 Matsushita Electronics (S) Pte. Ltd. All rights reserved.
Unauthorized copying and distribution isaviolation of law.
1. Before Repair and Adjustment
Disconnect AC power, discharge PowerSupplyCapacitors C311, C313, C314, C506, C507, C508,
C584, C587, C588 and C708 through a 10 , 5 W resistortoground. DO NOTSHORT-CIRCUIT
DIRECTLY (witha screwdriverblade, forinstance), as this maydestroysolidstate devices.
Afterrepairs are completed, restore powergraduallyusing a variac, toavoidovercurrent.
Current consumption at AC 230 V, 50 Hz inNO SIGNALmode shouldbe ~300 mA.
3

2. Protection Circuitry
The protection circuitrymayhave operatedif eitherof the following conditions are noticed:
-Nosound isheard when the power isturned on.
-Stops during aperformance.
The function of this circuitryis toprevent circuitrydamage if, forexample, the positive and
negative speakerconnection wires are “shorted”, orif speakersystems withanimpedance less
thanthe indicatedratedimpedance of the amplifierare used.
If this occurs, followthe procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once againafter one minute.
Note:
Whenthe protection circuitryfunctions, the unit will not operate unless the poweris first turned
off and thenon again.
3. Accessories AC MainLead.....(ForEB only)
AC MainLead.....(ForE & EG only)
AM Loop Antenna.....1 pc
FM IndoorAntenna
Remote Control Transmitter.....1 pc
Antenna plug adaptor.....(ForEB only)
4

4. Caution for AC Main Lead
5. Front Panel Controls
5

6

6. Handling the Lead-free Solder
6.1. About lead free solder (PbF)
Distinction of PbF P.C.B.:
P.C.B.s (manufactured) using leadfree solderwill have a PbF stampon the P.C.B.
Caution:
-Pb free solder has ahigher melting point than standard solder;
Typicallythe melting point is50 -70°F (30 -40°C)higher. Please
use ahigh temperature soldering iron. Incase of soldering iron
with temperature control, please set itto 700 ± 20°F (370 ± 10°C).
-Pb free solder will tend to splash when heated too high (about
1100°F/600°C).
-When soldering or unsoldering, please completelyremove all of
the solder on the pins or solder area, and be sure to heat the
soldering points with the Pb free solder until itmelts enough.
7. 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 breakdown
during repairof the traverse deck (optical pickup).
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-Handling of traverse deck (optical pickup)
1. Donot subject the traverse deck (optical pickup) to static
electricityas itisextremelysensitive to electrical shock.
2. To prevent the breakdownof the laser diode, an antistatic
shorting pinisinserted into the flexibleboard (FFCboard).
3. Take care not to applyexcessive stress to the flexibleboard (FFC
board). When removing or connecting the short pin, finish the job
inas short time as possible.
4. Donot turn the variableresistor (laser power adjustment). Ithas
alreadybeen adjusted.
-Grounding for electrostaticbreakdownprevention
1. Human bodygrounding
Use the anti-staticwrist strap to discharge the staticelectricity
from your body.
2. Work tablegrounding.
Put aconductive material (sheet) or steel sheet on the area where
the traverse deck (optical pickup) isplace, and ground the sheet.
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).
on whenreplacing the Traverse Deck
The traverse deck has a short point shortedwithsoldertoprotect the laserdiode against
electrostatics breakdown. Be sure toremove the solderfromthe short point before making
connections.
Figure No.7.1
8

Figure No.7.2
8. Disassembly and Main Component Replacement
Procedures.
“ATTENTION SERVICER”
Some chassis components maybe have sharpedges. Be careful whendisassembling and
servicing.
1. Thissection describes procedures for checking the operation of
the major printed circuitboards and replacing the main
components.
2. For reassemblyafter operation checks or replacement, reverse
the respective procedures. / Special reassemblyprocedures are
described onlywhen required.
3. Select items from the following index when checks or
replacement are required.
4. Refer the Parts No. on the page of “Maincomponent Replacement
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Procedures”, ifnecessary.
Contents
-Checking Procedure for each major P.C.B.
-Checking for the MainP.C.B. &Transformer P.C.B.
-Checking for the Deck P.C.B. and Deck Mechanism P.C.B.
-Checking for the Panel P.C.B.
-Checking for Headphone P.C.B. AC Led P.C.B. and Tact Switch
P.C.B.
-Checking for the CD Servo P.C.B. And CD Loading P.C.B.
-Disassemblyfor CD Loading Unit
-Disassemblyfor traverse mechanism
-MainComponent Replacement Procedure
-Procedure for Replacing Cassette Holder
-Procedure for Replacing Pinch Roller and Head Block (Cassette
Mechanism Unit)
-Procedure for Replacing Motor, Capstan BeltA, Capstan BeltB
and Winding Belt(Cassette Mechanism Unit)
-Procedure for Replacing Parts on Mechanism P.C.B.
-Replacement for CD traverse deck
-Replacement for optical pickup unit(CD Mechanism)
-Replacement for atraverse gear Aand atraverse gear B
-Replacement for disc tray
-Replacement for traverse deck
-Replacement of the power amplifier IC
-Handling of cassette tape jam
Warning:
Thisproduct uses alaser diode. Refer to “Precaution of Laser
Diode”.
ACHTUNG :-
-DieLasereinheitnicht zerlegen.
-DieLasereinheitdarf nur gegen eine vom Hertsteller spezifizierte
Einheitausgetauscht werden.
8.1. Checking Procedure for each major P.C.B
8.1.1. Checking forMain& TransformerP.C.B.
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Step1 Remove all the screws.
Step2 Remove side panel.
-Checking for MainP.C.B.
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Step3 Remove all the screws.
Step4 Remove side panel.
-Checking for Transformer P.C.B.
8.1.2. Checking forDeck P.C.B. and Deck Mechanism P.C.B.
-Follow the (Step 1) -(Step 4) of Item 8.1.1.
Step1 Remove one screwat the rearchassis.
Step2 Release claws at bothends, and lift up the (Deck Mechanism) (Top unit).
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-Checking for Deck P.C.B. and Deck Mechanism P.C.B.
8.1.3. Checking forPanel P.C.B.
-Follow the (Step 1) -(Step 4) of Item 8.1.1.
-Follow the (Step 1) -(Step 2) of Item 8.1.2.
Step1 Release connectorCN1303 & CN1304. Upset the Top cabinet.
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Step2 Release 2 claws. Disconnect CN505 & CN506.
Step3 Remove 2 screws.
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Step4 Pushfront panel forwardas arrowshown.
Step5 Reconnect CN1303, CN1304, CN505 and CN506 forchecking operation formainunit.
-Checking for Panel P.C.B.
8.1.4. Checking forHeadphone P.C.B., AC Led P.C.B. and Tact Switch P.C.B.
-Follow the (Step 1) -(Step 4) of Item 8.1.1.
-Follow the (Step 1) -(Step 2) of Item 8.1.2.
-Follow the (Step 1) -(Step 4) of Item 8.1.3.
Step1 Disconnect CN308 and CN606.
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-Checking for Headphone, AC Led &Tact Switch P.C.B.
8.1.5. Checking forCD Servo P.C.B. & CD Loading P.C.B.
-Follow the (Step 1) -(Step 4) of Item 8.1.1.
-Follow the (Step 1) -(Step 2) of Item 8.1.2.
-Follow the (Step 1) -(Step 4) of Item 8.1.3.
-Follow the (Step 1) of Item 8.1.4.
Step1 Remove FFC and connectorCN310 (Fanunit).
Step2 Remove all screws (back cabinet).
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Step3 Pull the back cabinet backward.
Step4 Remove all screws.
Step5 Remove all screws.
Step6 Lift up the middle unit as the arrowshownabove.
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Step7 Remove 2 screws. Upset the CD Unit sideway.
-Checking for CD Servo P.C.B. and CD Loading P.C.B.
8.1.6. Replacement of the PowerAmplifierIC
-Replacement of the Power Amplifier IC
-Follow the (Step 1) -(Step 4) of Item 8.1.1.
-Follow the (Step 1) -(Step 2) of Item 8.1.2.
-Follow the (Step 1) -(Step 4) of Item 8.1.3.
-Follow the (Step 1) of Item 8.1.4.
-Follow the (Step 1) -(Step 7) of Item 8.1.5.
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Step1 Remove 2 connectorCP501 and CP504 and pull out the MainP.C.B.
Step2 Remove 2 screws fixedtothe PowerAmpI.C.
Step4 Unsolderthe terminals of PowerAmpIC, and replace the component.
8.2. Procedure for Replacing Cassette Holder
-Follow the (Step 1) -(Step 4) of Item 8.1.1.
-Follow the (Step 1) -(Step 2) of Item 8.1.2.
Step2 Press the levertoopenthe cassette cover.
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8.3. Procedure for Replacing Pinch Roller and Head Block (Cassette
Mechanism Unit)
-Follow the (Step 1) -(Step 4) of Item 8.1.1.
-Follow the (Step 1) -(Step 2) of Item 8.1.2.
-Follow the (Step 1) -(Step 3) of Item 8.2.
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