Panasonic SA-PM41P User manual

nAmplifier Section
Power output
10%, Total harmonic distortion
60 Hz-3 kHz, both channels driven
(Low channel) 26 W per channel (6 Ω)
3 kHz-16 kHz, both channels driven
(High channel) 29 W per channel (6 Ω)
Total Bi-Amp power 55 W per channel
Power output
10% Total harmonic distortion
1 kHz, both channels driven
(Low channel) 35 W per channel (6 Ω)
8 kHz, both channels driven
(High channel) 35 W per channel (6 Ω)
Total Bi-Amp power 70 W per channel
Output Impedance
Headphone 16Ω-32Ω
nFM Tuner Section
Frequency range 87.5 MHz - 108.0 MHz
(100 kHz steps)
87.9 MHz - 107.9 MHz
(200 kHz steps)
Sensitivity 1.5 µV (IHF)
S/N 26dB 1.5 µV
A
ntenna terminal(s) 75 Ω(unbalanced)
nAM Tuner Section
Frequency range 520kHz - 1710 kHz (10kHz steps)
©2005 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-PM41P
SA-PM41PC
Colour
(S)... Silver Type
Sensitivity
S/N 20 dB (at 1000 kHz) 560 µV/m
nCassette Deck Section
Track system 4 track, 2 channel
Heads
Record/playback Solid permalloy head
Erasure Double gap ferrite head
Motor DC servo motor
Recording system AC bias 100 kHz
Erasing system AC erase 100 kHz
Tape speed 4.8 cm/s
Overall frequency response (+3 dB, -6 dB) at DECK OUT)
NORMAL (TYPE I) 35 Hz - 14 kHz
S/N RATIO 45dB (A weighted)
Wow and flutter 0.10% (WRMS)
Fast forward and rewind time Approx. 120 seconds with C-60
cassette tape
nCD Section
Disc
CD, CD-R, CD-RW, MP3 8cm / 12cm (3
3
/20”/4
73
/100”)
Sampling frequency 44.1 kHz
Decoding 16 bit linear
Beam source / wavelength Semiconductor laser / 780 nm
Number of channels Stereo
Frequency response 20 Hz - 20 kHz (+1dB, -2 dB)
Wow and flutter Below measurable limit
Digital filter 8fs
CD Stereo System
Specification
ORDER NO. MD0501004C1
A6

D/A converter MASH (1 bit DAC)
MP3
Bit rate 32kbps - 320kbps
Sampling frequency 32kHz, 44.1kHz, 48kHz
nSpeaker Section
Type 2 way, 2 speaker system
Speaker(s)
Full Range 10 cm (4”) cone type
Tweeter 6cm(2
3
/8”) cone type
Impedance 6Ω
Input power
HIGH 70 W (Max)
LOW 70 W (Max)
Output sound pressure level 80 dB/W (1.0 m)
Frequency range 55 Hz - 22 kHz (-16 dB)
70 Hz - 20 kHz (-10 dB)
Dimensions (W x H x D) 128 mm x 250 mm x 222 mm
(5 1/32”x927/32”x83/4”)
1 Safety Precautions 4
1.1. GENERAL GUIDELINES 4
2 Before Repair and Adjustment 6
3 Protection Circuitry 6
4 Handling the Lead-free Solder 7
4.1. About lead free solder (PbF) 7
5 Precaution of Laser Diode 8
6 Handling Precautions For Traverse Deck 9
7 Accessories 10
8 Operation Procedures 11
9 Information on Disc & MP3 12
10 Assembling and Disassembling 13
10.1. Disassembly flow chart 13
10.2. Disassembly of Side Panel L & R 14
10.3. Disassembly of Top Cabinet 14
10.4. Disassembly of Deck P.C.B. and Tape Eject P.C.B. 14
10.5. Disassembly of Front Panel 15
10.6. Disassembly of Main Control P.C.B., Function P.C.B. and
Power In P.C.B. 16
10.7. Disassembly of Panel P.C.B. 17
10.8. Disassembly of Rear Cabinet 17
10.9. Disassembly of Main P.C.B. 18
10.10. Disassembly of Transformer P.C.B. 18
10.11. Disassembly of Tuner Pack 19
10.12. Disassembly of Power P.C.B. 19
10.13. Disassembly of CR16 Mechanism 19
10.14. Replacement of CD Lid 20
Mass 1.95 kg (4.30 Ibs)
nGeneral
Power supply AC120V,60Hz
Power consumption 130 W
Dimensions (W x H x D) 179 mm x 250 mm x 383 mm
(7 1/16”x927/32”x153/12”)
Mass 5.24 kg (11.55 Ibs)
Power consumption in standby
mode
0.8 W
Notes :
1. Specifications are subject to change without notices. Mass and
dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum
analyzer.
3. The labels “HIGH” and “Low” on the rear of the speakers.
nSystem : SC-PM41P-S Music center: SA-PM41P-S
Speaker: SB-PM41P-S
nSystem : SC-PM41PC-S Music center: SA-PM41PC-S
Speaker: SB-PM41P-S
10.15. Replacement of Cassette Lid 21
10.16. Replacement of the Power IC and Transistors 22
10.17. Procedure for Replacing Pinch Roller and Head Block
(Cassette Mechanism Unit) 23
10.18. Procedure for Replacing Motor, Capstan Belt A, Capstan
Belt B, and Winding Belt (Cassette Mechanism Unit) 23
10.19. Procedure for Replacing Parts on Mechanism PCB 25
10.20. Disassembly of CR16 Mechanism 25
10.21. Replacement of optical pickup unit (CD mechanism) 26
10.22. Replacement of a traverse gear A and a traverse gear B
28
10.23. Procedure for removing CD loading mechanism 29
10.24. CR16 mechanism disassembly procedure 29
10.25. CR16 MECHANISM ASSEMBLY PROCEDURE 35
10.26. Disassembly of traverse mechanism 48
10.27. Handling of cassette tape jam 49
11 Service Positions 50
11.1. Checking procedure 50
11.2. Checking the major P.C.B 50
12 Self-Diagnostic Display Function 51
12.1. Entering into Self-Diagnostic Mode 51
12.2. Clearing Self-Diagnostic Memory 52
12.3. Displaying Self-Diagnostic Results 53
12.4. Error Code Table 53
12.5. Cassette Mechanism Self-Diagnostic Mode 54
12.6. Changer Reliability Test Mode 54
12.7. Changer Operation Checking 55
CONTENTS
Page Page
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SA-PM41 P / SA-PM41 PC

12.8. CR16 Mechanism Ageing Mode 55
13 Procedure for Checking Operation of Individual Parts of
Cassette Mechanism Unit 57
13.1. Operation Check with Cassette Tape 57
13.2. Operation Check without Cassette Tape 57
14 Measurement And Adjustments 59
14.1. Cassette Deck Section 59
15 Voltage Measurement 61
15.1. CD Servo P.C.B. (REPV0039A) 61
15.2. Main P.C.B. (REPV0062A) 62
15.3. Main Control P.C.B. (REPV0062A) 63
15.4. Deck P.C.B. (REPV0016B) 63
15.5. Deck Mechanism P.C.B. (REPX0321H) 63
15.6. CD Loading P.C.B. (REP3569A) 64
15.7. Power P.C.B. (REPV0038F) 64
15.8. Panel P.C.B. ( REPV0062A)
64
15.9. Transformer P.C.B. (REPV0038F) 64
16 Waveform Chart 65
17 Block Diagram 66
17.1. CD SERVO Block 66
17.2. MAIN Block 68
18 Notes of Schematic Diagram 74
19 Schematic Diagram 75
19.1. CD SERVO CIRCUIT 75
19.2. MAIN CIRCUIT 77
19.3. MAIN CONTROL CIRCUIT, PANEL CIRCUIT, POWER IN
CIRCUIT and FUNCTION CIRCUIT 81
19.4. DECK CIRCUIT, DECK MECHANISM CIRCUIT and TAPE
EJECT CIRCUIT 84
19.5. POWER CIRCUIT 86
19.6. TRANSFORMER CIRCUIT 89
19.7. CD LOADING CIRCUIT 90
20 Printed Circuit Board 91
20.1. CD SERVO P.C.B. 91
20.2. MAIN P.C.B. 92
20.3. MAIN CONTROL P.C.B. and PANEL P.C.B. 94
20.4. POWER IN P.C.B., FUNCTION P.C.B. and DECK
MECHANISM P.C.B. 95
20.5. DECK P.C.B. and TAPE EJECT P.C.B. 96
20.6. POWER P.C.B. 97
20.7. TRANSFORMER P.C.B. 98
20.8. CD LOADING P.C.B. 99
21 Wiring Connection Diagram 100
22 Illustration of IC 痴, Transistors and Diodes 102
23 Terminal Function of ICｴs 103
23.1. IC302 (C2CBJG000575) MICRO PROCESSOR 103
23.2. IC702 (MN6627953HB) Servo processor/ Digital signal
processor/ Digital filter/ D/A converter 104
23.3. IC703 (BA5948FPE2) IC 4CH DRIVE 104
24 Troubleshooting Flowchart (CD Section Circuit) 106
25 Parts Location and Replacement Parts List 108
25.1. Deck Mechanism 109
25.2. CD LOading Mechanisms 111
25.3. Cabinet Part List 116
25.4. Electrical Part List 120
25.5. Packaging Materials & Accessories Parts List 129
25.6. Packaging 129
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SA-PM41 P / SA-PM41 PC

(This “Safety Precaution” is applied only in U.S.A.)
1 Safety Precautions
1.1. GENERAL GUIDELINES
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, ensure that all the protective devices such as insulation barriers, insulation papers shields are properly installed.
3. After servicing, check for leakage current checks to prevent from being exposed to shock hazards.
1. Before servicing, unplug the power cord to prevent an electric shock.
2. When replacing parts, use only manufacturer’s recommended components for safety.
3. Check the condition of the power cord. Replace if wear or damage is evident.
4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5. 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.
1.1.1. LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. Using an ohmmeter measure the resistance value, between the jumpered AC plug and each exposed metallic cabinet part on
the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the
chassis, the reading should be between 1MΩand 5.2Ω.
When the exposed metal does not have a return path to the chassis, the reading must be .
Fig. 1
1.1.2. LEAKAGE CURRENT HOT CHECK (See Figure 1.)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF capacitors, between each exposed metallic part on the set and a
good earth ground such as a water pipe, as shown in Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of the above measuremen ts.
6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may
be used to make the hot checks, leakage current must not exceed 1/2 milliamp. should the measuremen t is outside of the limits
specified, there is a possibility of a shock hazard, and the equipment should be repaired and re-checked before it is returned
to the customer.
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SA-PM41 P / SA-PM41 PC

1.1.3. Caution for fuse replacement
5
SA-PM41 P / SA-PM41 PC

2 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C506, C507, C508, C601, C602, C600, & C620 through a 10Ω,1W
resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
· Current consumption at AC 120V, 60 Hz in NO SIGNAL mode should be ~300 mA.
3 Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
· No sound is heard when the power is turned on.
· Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
"shorted", or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
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SA-PM41 P / SA-PM41 PC

4 Handling the Lead-free Solder
4.1. About lead free solder (PbF)
Distinction of PbF P.C.B.:
P.C.B.s (manufactured) using lead free solder will have a PbF stamp on the P.C.B.
Caution:
· Pb free solder has a higher melting point than standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher. Please
use a high temperature soldering iron. In case of soldering iron with temperature control, please set it to 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 completely remove all of the solder on the pins or solder area, and be sure to heat the
soldering points with the Pb free solder until it melts enough.
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SA-PM41 P / SA-PM41 PC

This unit utilizes a class 1 laser.
Invisible laser radiation is emitted from the optical pickup lens.
When the unit is turned on:
5 Precaution of Laser Diode
CAUTION:
1. Do not look directly into the pick up lens.
2. Do not use optical instruments to look at the pick up lens.
3. Do not adjust the preset variable resistor on the pickup lens.
4. Do not disassemble the optical pick up unit.
5. If the optical pick up is replaced, use the manufacturer’s specified replacement pick up only.
6. Use of control or adjustments or performance of procedures other than those specified herein may result in hazardous radiation
exposure.
CAUTION!
THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.
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SA-PM41 P / SA-PM41 PC

6 Handling Precautions For Traverse Deck
The laser diode in the traverse deck (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 traverse deck (optical pickup).
· Handling of traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock.
2. To prevent the breakdown of the laser diode, an antistatic shorting pin is inserted into the flexible board (FFC board).
3. Take care not to apply excessive stress to the flexible board (FFC board). When removing or connecting the short pin, finish
the job in as short time as possible. (Fig 6.1)
4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.
· Grounding for electrostatic breakdown prevention
1. Work table grounding. (Fig 6.2)
Use the anti-static wrist strap to discharge the static electricity from your body.
2. Work table grounding. (Fig 6.2)
Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is place, 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
traverse deck (optical pickup).
Caution when replacing the Traverse Deck
The traverse deck has a short point shorted with solder to protect the laser diode against electrostatics breakdown. Be sure to
remove the solder from the short point before making connections.
(Fig 6.1)
(Figs 6.2)
9
SA-PM41 P / SA-PM41 PC

7 Accessories
Note : Refer to Packing Materials & Accessories Parts List (Section 25.5) for the part number.
Remote Control
AC power cord
FM indoor antenna
AM loop antenna
10
SA-PM41 P / SA-PM41 PC

8 Operation Procedures
11
SA-PM41 P / SA-PM41 PC

9 Information on Disc & MP3
12
SA-PM41 P / SA-PM41 PC

10 Assembling and Disassembling
“ATTENTION SERVICER”
Some chassis components may be have sharp edges. Be careful when disassemblin g and servicing.
1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the main
components.
2. For reassembly after operation checks or replacement, reverse the respective procedures.
Special reassembly procedures are described only when required.
3. Select items from the following index when checks or replacement are required.
Warning:
This product uses a laser diode. Refer to “Precaution of Laser Diode”.
10.1. Disassembly flow chart
The following chart is the procedure for disassemblin g the casing and inside parts for internal inspection when carrying out the
servicing.
To assemble the unit, reverse the steps shown in the chart below.
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SA-PM41 P / SA-PM41 PC

10.2. Disassembly of Side Panel L &
R
Step 1 : Remove 5 screws from the side panel (R).
Step 2 : Remove 1 screws from the corner of the side panel
(R).
Step 3 : Remove the side panel as arrow shown (Be careful of
the catches).
Step 4 : Remove 5 screws from the side panel (L).
Step 5 : Remove 1 screws from the corner of the side panel (L).
Step 6 : Remove the side panel as arrow shown (Be careful of
the catches).
10.3. Disassembly of Top Cabinet
· Follow the (Step 1) - (Step 6) of item 10.2.
Step 1 : Remove 1 screws.
Step 2 : Lift up the top cabinet as arrow shown (Be careful of
the catches).
Step 3 : Place the top cabinet as shown and detach the
connector CN1305.
10.4. Disassembly of Deck P.C.B.
and Tape Eject P.C.B.
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
14
SA-PM41 P / SA-PM41 PC

Step 1 : Remove 1 screw.
Step 2 : Release the clutch and remove the Tape Eject P.C.B..
Step 3 : Remove 4 screws.
Step 4 : Push the lever as arrow shown to remove the Deck
Mechanism.
10.5. Disassembly of Front Panel
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
Step 1 : Detach the connector CN308.
Step 2 : Detach the connector CN505.
15
SA-PM41 P / SA-PM41 PC

Step 3 : Release 2 catches.
Step 4 : Release the catch at the bottom cabinet and remove
the front panel as arrow shown.
10.6. Disassembly of Main Control
P.C.B., Function P.C.B. and
Power In P.C.B.
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
· Follow the (Step 1) - (Step 4) of item 10.5.
· Disasembly of Main Control P.C.B.
Step 1 : Remove 4 screws to remove the shield plate.
Step 2 : Flip the Main Control P.C.B. as arrow shown.
Step 3 : Detach the connector CN603A.
· Disasembly of Function P.C.B. and Power In P.C.B.
16
SA-PM41 P / SA-PM41 PC

Step 4 : Remove 4 screws.
Step 5 : Release the 2 clutches and remove Function P.C.B.
and Power In P.C.B. together with Main Control P.C.B..
10.7. Disassembly of Panel P.C.B.
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
· Follow the (Step 1) - (Step 4) of item 10.5.
· Follow the (Step 1) - (Step 5) of item 10.6.
Step 1 : Remove the volume knob.
Step 2 : Remove 7 screws.
Step 3 : Release 3 clutches and remove the Panel P.C.B. as
arrow shown.
10.8. Disassembly of Rear Cabinet
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
Step 1 : Detach the connector CN303.
17
SA-PM41 P / SA-PM41 PC

Step 2 : Remove 9 screws altogether.
Step 3 : Remove the rear cabinet as arrows shown (Be careful
of the catches).
10.9. Disassembly of Main P.C.B.
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
· Follow the (Step 1) - (Step 3) of item 10.8.
Step 1 : Detach the connector CN308, CN305 and CN306.
Step 2 : Release the catch as arrow shown and detach the
connector CN304.
Step 3 : Detach the connectors CN301 and CN302 and pull out
the Main P.C.B. as arrow shown.
10.10. Disassembly of Transformer
P.C.B.
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
· Follow the (Step 1) - (Step 3) of item 10.8.
Step 1 : Detach the connectors CN505 and CN506.
18
SA-PM41 P / SA-PM41 PC

Step 2 : Remove 4 screws and pull out the Transformer P.C.B.
as arrow shown.
10.11. Disassembly of Tuner Pack
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
· Follow the (Step 1) - (Step 3) of item 10.8.
Step 1 : Detach the connector CN101 and remove the tuner
pack as arrow shown.
10.12. Disassembly of Power P.C.B.
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
· Follow the (Step 1) - (Step 4) of item 10.5.
· Follow the (Step 1) - (Step 3) of item 10.8.
· Follow the (Step 1) - (Step 3) of item 10.9.
· Follow the (Step 1) - (Step 2) of item 10.10.
Step 1 : Remove 4 screws.
Step 2 : Remove the Power P.C.B. as arrow shown (Be careful
of the catch)
10.13. Disassembly of CR16
Mechanism
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
· Follow the (Step 1) - (Step 4) of item 10.5.
Step 1 : Remove 2 screws.
19
SA-PM41 P / SA-PM41 PC

Step 2 : Detach the connectors CN305 and CN306.
Step 3 : Remove the tape which used to secure the FFC
connectors.
Step 4 : Release the catches and remove the middle block as
arrow shown.
Step 5 : Remove 2 screws and remove the CD Mechanism Unit
from the bottom chassis as arrow shown.
10.14. Replacement of CD Lid
· Follow the (Step 1) - (Step 6) of item 10.2.
· Follow the (Step 1) - (Step 3) of item 10.3.
· Follow the (Step 1) - (Step 4) of item 10.5.
Step 1 : Remove 2 screws 2 CD Lid supports and earth plate.
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SA-PM41 P / SA-PM41 PC