Panasonic SA-PM21PC User manual

nAmplifier 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
nFM 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
A
ntenna terminals 75 Ω(unbalanced)
nAM Tuner Section
Frequency range 520 kHz - 1710 kHz (10 kHz step)
Sensitivity
S/N 20 dB (at 1000 kHz) 500 µV/m
©2005 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-PM21PC
Colour
(S)... Silver Type
nCassette Deck Section
Track system 4 track, 2 channel
Heads
Record/playback Solid permalloy head
Erasure AC erase head
Motor DC servo moto
r
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
nCD 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
r
CD Stereo System
Specification
ORDER NO. MD0501013C1
A6

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)
nGeneral
Power supply AC 120 V, 60 Hz
Power consumption 57 W
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 6
4.1. About lead free solder (PbF) 6
5 Precaution of Laser Diode 7
6 Handling Precautions For Traverse Deck 8
7 Accessories 9
8 Operation Procedures 10
9 Information on CD & MP3 11
10 Assembling and Disassembling 12
10.1. Disassembly flow chart 12
10.2. Disassembly of Side Panel L & R 13
10.3. Disassembly of Top Cabinet Unit 13
10.4. Disassembly of Deck Mechanism and Tape Eject P.C.B
13
10.5. Disassembly of Headphone P.C.B 14
10.6. Disassembly of Front Panel Assembly 14
10.7. Disassembly of Panel P.C.B 15
10.8. Disassembly of Rear Cabinet 15
10.9. Disassembly of Tuner Pack 15
10.10. Disassembly of Main P.C.B 16
10.11. Disassembly of Power P.C.B 16
10.12. Disassembly of Speaker Terminal P.C.B 17
10.13. Disassembly of Transformer P.C.B 17
10.14. Disassembly of CD Mechanism 18
10.15. Checking Procedure for Each Major P.C.B. 19
10.16. Procedures of Replacing Traverse Base (Unit), Driving
Gear, and Cam Gear (CD Mechanism Unit) 19
10.17. Procedures for Replacing Optical Pickup (CD Mechanism
Unit) 22
10.18. Procedures for Replacement Traverse Gear A and
Traverse Gear B (CD Mechanism Unit) 23
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
0.5 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.
nSystem : SC-PM21PC-S Music center: SA-PM21PC-S
Speaker: SB-PM21E-MJ
10.19. Procedure for Replacing Cassette Holder 24
10.20. Procedure for Replacing Pinch Roller and Head Block
(Deck Mechanism Unit) 24
10.21. Procedure for Replacing Motor, Capstan Belt A, Capstan
Belt B, and Winding Belt (Deck Mechanism Unit) 25
10.22. Procedure for Replacing Parts on Deck Mechanism PCB
27
10.23. Handling of cassette tape jam 27
11 Service Positions 29
11.1. Checking procedure 29
11.2. Checking the major P.C.B. 29
12 Self Diagnostic Function 30
12.1. Self-diagnosis Function 30
12.2. Clearing all error code 32
12.3. Cancelling the Self-Diagnostic mode 32
12.4. Setting of doctor mode 32
13 Procedure for Checking Operation of Individual Parts of Deck
Mechanism Unit 37
13.1. Operation Check with Cassette Tape 37
13.2. Operation Check without Cassette Tape 37
14 Measurement And Adjustments 39
14.1. Cassette Deck Section 39
15 Voltage Measurement and Waveform Chart 41
15.1. Voltage Measurement 41
15.2. Waveform 43
16 Block Diagram 44
16.1. CD Servo Block 44
16.2. Main Block 46
17 Notes of Schematic Diagram 50
18 Schematic Diagram 51
18.1. CD Servo Circuit 51
18.2. Main Circuit and Tuner Extent Circuit 53
18.3. Panel Circuit 57
CONTENTS
Page Page
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SA-PM21PC

18.4. Deck Circuit, Deck Mechanism Circuit and Tape Eject
Circuit 58
18.5. Power Circuit 60
18.6. Transformer Circuit, Headphone Circuit and Speaker
Terminal Circuit 61
19 Printed Circuit Board 62
19.1. CD Servo P.C.B. 62
19.2. Main P.C.B. 63
19.3. Tuner Extent P.C.B, Headphone P.C.B and Speaker
Terminal P.C.B. 65
19.4. Panel P.C.B. 66
19.5. Deck P.C.B and Deck Mechanism P.C.B. 67
19.6. Power P.C.B. 68
19.7. Transformer P.C.B and Tape Eject P.C.B. 69
20 Wiring Connection Diagram 70
21 Illustration of IC 痴, Transistors and Diodes 72
22 Terminal Function of ICｴs 73
22.1. IC702 (MN6627953HB) Servo processor/ Digital signal
processor/ Digital filter/ D/A converter 73
22.2. IC703 (BA5948FPE2) IC 4CH DRIVE 74
22.3. IC803 (MN101C49GHA) MICRO PROCESSOR 75
23 Troubleshooting Flowchart (CD Section Circuit) 76
24 Parts Location and Replacement Parts List 78
24.1. Deck Mechanism 79
24.2. CD Loading Mechanism 81
24.3. Cabinet 83
24.4. Electrical Part List 86
24.5. Packaging Materials & Accessories Parts List 92
24.6. Packaging 92
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SA-PM21PC

(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 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.
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SA-PM21PC

1.1.3. Caution for fuse replacement
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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.
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SA-PM21PC

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.
7
SA-PM21PC

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).
lHandling 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 6.1
lGrounding 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).
Fig 6.2
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.
6 Handling Precautions For Traverse Deck
8
SA-PM21PC

Remote control
AC cord
FM indoor
antenna
AM loop antenna
7 Accessories
Note : Refer to Packing Materials & Accessories (Section 24.5) for part number.
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SA-PM21PC

8 Operation Procedures
10
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9 Information on CD & MP3
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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.
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SA-PM21PC

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).
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 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 : 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.
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SA-PM21PC

Step 1 : Remove 1 screw.
Step 2 : Release the clutch.
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 : Remove 1 screw.
Step 2 : Release the clutch.
10.6. Disassembly of Front Panel
Assembly
·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 .
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SA-PM21PC

Step 2 : Detach the FFC CN901B.
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 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 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.
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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 1 : Detach the FFC CN801.
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 connector CN505B.
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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.
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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.
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SA-PM21PC

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.
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.
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.
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SA-PM21PC