panasonic SA-PM21PC Service Manual

CD Stereo System

SA-PM21PC

Colour

(S)... Silver Type

ORDER NO. MD0501013C1

Specification

n Amplifier Section

FTC Output Power both channel driven

10% total harmonic distortion

20 Hz - 3.5 kHz (Low channel) 15 W per channel (6 Ω)

3.5 kHz - 20 kHz (High channel) 5 W per channel (6 Ω)

RMS Output Power both channel driven

10% total harmonic distortion

1 kHz (Low channel) 15 W per channel (6 Ω)

8 kHz (High channel) 5 W per channel (6 Ω)

Total Bi-Amp power 20 W per channel

Output impedance

Headphone 16 Ω -32Ω

n FM Tuner Section

Frequency range 87.5 MHz -108.0 MHz

(100 kHz step)

87.9 MHz - 107.9 MHz (200 kHz step)

Sensitivity 1.5 µV (IHF)

S/N 26 dB 1.25 µV

ntenna terminals 75 Ω (unbalanced)

n AM Tuner Section

Frequency range 520 kHz - 1710 kHz (10 kHz step)

Sensitivity

S/N 20 dB (at 1000 kHz) 500 µV/m

n Cassette Deck Section

Track system 4 track, 2 channel

Heads

Record/playback Solid permalloy head

Erasure AC erase head

Motor DC servo moto

Recording system AC bias 100 kHz

Erase system AC erase 100 kHz

Tape speed 4.8cm/s(17/8ips)

Overall frequency response (+3 dB, -6 dB) at DECK OUT

NORMAL 35 Hz - 14 kHz

S/N RATIO 50 dB (A weighted)

Wow and flutter 0.08% (WRMS)

Fast forward and rewind time Approx. 120 seconds with C-60

cassette tape

n CD Section

Disc played

CD/MP3/CD-R/RW 8cm/12cm (3 3/20”/4 73/100”)

Bit rate

MP3 32kbps - 320kbps

Sampling frequency

CD 44.1 kHz

MP3 32 kHz, 44.1 kHz, 48 kHz

Decoding 16 bit linea

SA-PM21PC

Pickup

Beam source / wavelength Semiconductor laser / 780nm

Number of channels Stereo

Wow and flutter Below measurable limit

Digital filter 8fs

D/A converter MASH (1 bit DAC)

Frequency response 20Hz - 20 kHz (+1dB, -2dB)

n General

Power supply AC 120 V, 60 Hz

Power consumption 57 W

Dimensions (W x H x D) 165 x 228 x 315.6 mm

(6 1/2” x 9” x 12 7/16”)

Mass 3.6kg(7.9Ibs)

Power consumption in standby mode

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.

n System : SC-PM21PC-S Music center: SA-PM21PC-S

Speaker: SB-PM21E-MJ

CONTENTS

Page Page

1 Safety Precautions

1.1. GENERAL GUIDELINES

2 Before Repair and Adjustment

3 Protection Circuitry

4 Handling the Lead-free Solder

4.1. About lead free solder (PbF)

5 Precaution of Laser Diode

6 Handling Precautions For Traverse Deck

7 Accessories

8 Operation Procedures

9 Information on CD & MP3

10 Assembling and Disassembling

10.1. Disassembly flow chart

10.2. Disassembly of Side Panel L & R

10.3. Disassembly of Top Cabinet Unit

10.4. Disassembly of Deck Mechanism and Tape Eject P.C.B

10.5. Disassembly of Headphone P.C.B

10.6. Disassembly of Front Panel Assembly

10.7. Disassembly of Panel P.C.B

10.8. Disassembly of Rear Cabinet

10.9. Disassembly of Tuner Pack

10.10. Disassembly of Main P.C.B

10.11. Disassembly of Powe r P.C.B

10.12. Disassembly of Speak er Termi nal P.C.B

10.13. Disassembly of Trans forme r P.C.B

10.14. Disassembly of CD Mechanism

10.15. Checking Procedure for Each Major P.C.B.

10.16. Procedures of Repla cing Trave rse Base (Unit), Driving

Gear, and Cam Gear (CD Mechanism Unit)

10.17. Procedures for Repla cing Optica l Pickup (CD Mechanism

Unit)

10.18. Procedures for Repla ceme nt Traverse Gear A and

Traverse Gear B (CD Mechanism Unit)

10.19. Procedure for Repla cing Casse tte Holde r

10.20. Procedure for Repla cing Pinch Roller and Head Block

(Deck Mechanism Unit)

10.21. Procedure for Repla cing Motor , Capstan Belt A, Capst an

Belt B, and Winding Belt (Deck Mechanism Unit)

10.22. Procedure for Repla cing Parts on Deck Mechanism PCB

10.23. Handling of casse tte tape jam

11 Service Positions

11.1. Checking procedure

11.2. Checking the major P.C.B.

12 Self Diagnostic Function

12.1. Self-diagnosis Function

12.2. Clearing all error code

12.3. Cancelling the Self-Diagnostic mode

12.4. Setting of doctor mode

13 Procedure for Checking Operation of Individual Parts of Deck

Mechanism Unit

13.1. Operation Check with Cassette Tape

13.2. Operation Check without Cassette Tape

14 Measurement And Adjustments

14.1. Cassette Deck Section

15 Voltage Measurement and Waveform Chart

15.1. Voltage Measureme nt

15.2. Waveform

16 Block Diagram

16.1. CD Servo Block

16.2. Main Block

17 Notes of Schematic Diagram

18 Schematic Diagram

18.1. CD Servo Circuit

18.2. Main Circuit and Tuner Extent Circuit

18.3. Panel Circuit

0.5 W

18.4. Deck Circuit, Deck Mechanism Circuit and Tape Eject

Circuit

18.5. Power Circuit

18.6. Transformer Circuit, Headphone Circuit and Speaker

Terminal Circuit

19 Printed Circuit Board

19.1. CD Servo P.C.B.

19.2. Main P.C.B.

19.3. Tuner Extent P.C.B, Headphone P.C.B and Speaker

Terminal P.C.B.

19.4. Panel P.C.B.

19.5. Deck P.C.B and Deck Mechanism P.C.B.

19.6. Power P.C.B.

19.7. Transformer P.C.B and Tape Eject P.C.B.

20 Wiring Connection Diagram

21 Illustration of IC 痴, Transistors and Diodes 22 Terminal Function of ICｴs

22.1. IC702 (MN662795 3HB) Servo processor/ Digital signal

processor/ Digital filter/ D/A converter

22.2. IC703 (BA5948FPE2) IC 4CH DRIVE

22.3. IC803 (MN101C49GHA) MICRO PROCESSOR

23 Troubleshooting Flowchart (CD Section Circuit)

24 Parts Location and Replaceme nt Parts List

24.1. Deck Mechanism

24.2. CD Loading Mechanism

24.3. Cabinet

24.4. Electrical Part List

24.5. Packaging Materials & Accessories Parts List

24.6. Packaging

SA-PM21PC

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.

(This “Safety Precaution” is applied only in U.S.A.)

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 1MΩ and 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 measurements.

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 measurement 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.

1.1.3. Caution for fuse replacement

SA-PM21PC

2 Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C839 & C840 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 120 V, 60 Hz in NO SIGNAL mode should be ~200 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.

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.

SA-PM21PC

5 Precaution of Laser Diode

CAUTION:

This unit utilizes a class 1 laser.

Invisible laser radiation is emitted from the optical pickup lens.

When the unit is turned on:

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.

SA-PM21PC

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).

l Handling of CD 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. The short land between the No.4 (LD) and No.5 (GND) pins on the flexible board (FFC) is shorted with a solder build-up to prevent damage to the laser diode.

3. Take care not to apply excessive stress to the flexible board (FFC board) (Fig 6.1).

4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.

Fig 6.2

Fig 6.1

l Grounding for electrostatic breakdown prevention

1. Human body 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 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 traverse deck (optical pickup).

Caution when Replacing the Optical Pickup :

The traverse 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.

7 Accessories

Note : Refer to Packing Materials & Accessories (Section 24.5) for part number.

Remote control

AC cord

FM indoor

antenna

SA-PM21PC

AM loop antenna

SA-PM21PC

8 Operation Procedures

9 Information on CD & MP3

SA-PM21PC

10 Assembling and Disassembling

“ATTENTION SERVICER”

Some chassis components may be have sharp edges. Be careful when disassembling 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 disassembling 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.

10.2. Disassembly of Side Panel L & R

Step 1 : Remove 4 screws.

Step 2 : Remove 1 screw.

Step 3 : Remove the side panel (R) as arrow shown (Be careful of the catches).

SA-PM21PC

Step 1 : Remove 1 screw.

Step 2 : Release catches at both ends.

Step 3 : Lift up the top cabinet unit, push backward as arrow shown and flip top cabinet unit sideway.

Step 4 : Remove 4 screws.

Step 5 : Remove 1 screw.

Step 6 : Remove the side panel (L) as arrow shown (Be careful of the catches).

10.3. Disassembly of Top Cabinet Unit

· Follow the (Step 1) - (Step 6) of Item 10.2.

Step 4 : Detach the connectors CN504A and FFC CN804.

10.4. Disassembly of Deck Mechanism and Tape Eject P.C.B

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

SA-PM21PC

Step 1 : Remove 1 screw.

Step 2 : Release the clutch.

Step 1 : Remove 1 screw.

Step 2 : Release the clutch.

10.6. Disassembly of Front Panel Assembly

Step 3 : Remove 4 screws.

Step 4 : Push the lever as arrow shown to open the cassette lid and remove the deck mechanism unit.

10.5. Disassembly of Headphone P.C.B

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

Step 1 : Detach the connector CN900B .

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

Step 2 : Detach the FFC CN901B.

SA-PM21PC

Step 1 : Remove 10 screws.

Step 2 : Remove the Volume Knob.

10.8. Disassembly of Rear Cabinet

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

Step 3 : Release 3 Claws.

Step 4 : Remove the front panel assembly as arrow shown.

10.7. Disassembly of Panel P.C.B

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.6.

Step 1 : Remove 6 screws.

Step 2 : Remove the rear cabinet as arrow shown.

10.9. Disassembly of Tuner Pack

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 2) of Item 10.8.

SA-PM21PC

Step 1 : Detach the connector CN805A and remove the tuner pack as arrow shown.

10.10. Disassembly of Main P.C.B

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.6.

· Follow the (Step 1) - (Step 2) of Item 10.8.

Step 2 : Detach the connector CN803A, CN808A.

Step 3 : Detach the connector CP800.

Step 4 : Remove the Main P.C.B as arrow shown.

10.11. Disassembly of Power P.C.B

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 2) of Item 10.8.

Step 1 : Detach the FFC CN801.

Step 1 : Detach the connector CN505B.

SA-PM21PC

Step 2 : Remove 1 screw.

Step 3 : Detach the connector CN503A, CN508A, CN501B.

Step 4 : Remove the Power P.C.B as arrow shown.

10.12. Disassembly of Speaker Terminal P.C.B

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 2) of Item 10.8.

· Follow the (Step 1) - (Step 2) of Item 10.10.

· Follow the (Step 2) - (Step 4) of Item 10.11.

Step 1 : Remove 1 screw.

Step 2 : Release the clutch.

Step 3 : Remove the Speaker Terminal P.C.B as arrow shown.

10.13. Disassembly of Transformer P.C.B

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 2) of Item 10.8.

· Follow the (Step 1) - (Step 4) of Item 10.11.

Step 1 : Detach the connector CN900B.

Step 2 : Remove 4 screws.

SA-PM21PC

10.14. Disassembly of CD Mechanism

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.6.

· Follow the (Step 1) - (Step 2) of Item 10.8.

· Follow the (Step 1) - (Step 4) of Item 10.10.

Step 1 : Remove 4 screws.

Step 2 : Remove the Main P.C.B Support.

10.15. Checking Procedure for Each Major P.C.B.

10.15.1. Replacement of the Power

Amplifier IC

· Replacement of the Power Amplifier IC

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 2) of Item 10.8.

· Follow the (Step 1) - (Step 4) of Item 10.11.

SA-PM21PC

10.16. Procedures of Replacing Traverse Base (Unit), Driving Gear, and Cam Gear (CD Mechanism Unit)

10.16.1. Disassembly of the Disc Tray.

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.6.

· Follow the (Step 1) - (Step 2) of Item 10.8 .

· Follow the (Step 1) - (Step 4) of Item 10.10.

· Follow the (Step 1) - (Step 2) of Item 10.14.

Step 1 Remove 5 screws.

Step 2 Unsolder the terminals of Power Amp IC (IC300, IC500)

and replace the component.

Step 3 Unsolder the terminals of Transistor (Q503) and replace the component.

SA-PM21PC

10.17. Procedures for Replacing Optical Pickup (CD Mechanism Unit)

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.6.

· Follow the (Step 1) - (Step 2) of Item 10.8.

· Follow the (Step 1) - (Step 4) of Item 10.10.

· Follow the (Step 1) - (Step 2) of Item 10.14.

· Follow the (Step 1) - (Step 4) of Item 10.16.1.

SA-PM21PC

10.18. Procedures for Replacement Traverse Gear A and Traverse Gear B (CD Mechanism Unit)

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.6.

· Follow the (Step 1) - (Step 2) of Item 10.8.

· Follow the (Step 1) - (Step 4) of Item 10.10.

· Follow the (Step 1) - (Step 2) of Item 10.14.

· Follow the (Step 1) - (Step 2) of Item 10.16.1.

SA-PM21PC

10.19. Procedure for Replacing Cassette Holder

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.4.

10.20. Procedure for Replacing Pinch Roller and Head Block (Deck Mechanism Unit)

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.4.

SA-PM21PC

10.21. Procedure for Replacing Motor, Capstan Belt A, Capstan Belt B, and Winding Belt (Deck Mechanism Unit)

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.4.

· Follow the (Step 1) - (Step 4) of Item 10.20.

SA-PM21PC

10.22. Procedure for Replacing Parts on Deck Mechanism PCB

· Follow the (Step 1) - (Step 6) of Item 10.2.

· Follow the (Step 1) - (Step 4) of Item 10.3.

· Follow the (Step 1) - (Step 4) of Item 10.4.

SA-PM21PC

10.23. Handling of cassette tape jam

· Follow the (Step 1) - (Step 6) of Item 10.2.

SA-PM21PC

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