Panasonic SA-PM31P User manual

nAmplifier Section
Power output
10% Total harmonic distortion
60 Hz - 3 kHz, both channels driven
(Low channel) 35 W per channel (6 Ω)
3 kHz - 16 kHz, both channels driven
(High channel) 35 W per channel (6 Ω)
Total Bi-Amp power 70 W per channel
Power output
10% Total harmonic distortion
1 kHz, both channels driven
(Low channel) 40 W per channel (6 Ω)
8 kHz, both channels driven
(High channel) 40 W per channel (6 Ω)
Total Bi-Amp power 80 W per channel
Output Impedance
Headphone 16 Ω-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 1.02 µV (IHF)
S/N 26 dB 1.00 µV
A
ntenna terminal(s) 75 Ω(unbalanced)
©2004 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-PM31P
SA-PM31PC
Colour
(S)... Silver Type
nAM Tuner Section
Frequency range 520 kHz - 1710 kHz (10 kHz
steps)
Sensitivity
S/N 20 dB (at 1000 kHz) 900 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 42.64 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
CD Stereo System
Specification
ORDER NO. MD0412578C1
A6

CD, CD-R, CD-RW, MP3 8 cm/12 cm (3-3/20” / 4-
73/100”)
Sampling frequency 44.1 kHz
Decoding 16/20/24 bit linear
Beam source/wavelength Semiconductor laser / 780 nm
Number of channels Stereo
Frequency response 20 Hz - 20 kHz (+1dB, -2dB)
Wow and flutter Below measurable limit
Digital filter 8fs
D/A converter MASH (1 bit DAC)
MP3
Bit rate 32 kbps - 320 kbps
Sampling frequency 32kHz, 44.1kHz, 48kHz
nGeneral
Power supply AC 120 V, 60 Hz
1 Safety Cautions 4
1.1. GENERAL GUIDELINES 4
2 Before Repair and Adjustment 5
3 Protection Circuitry 5
4 Handling the Lead-free Solder 5
4.1. About lead free solder (PbF) 5
5 Precaution of Laser Diode 6
6 Handling Precautions For Traverse Deck 7
7 Accessories 8
8 Operating Procedures 9
9 Assembling and Disassembling 11
9.1. Disassembly flow chart 11
9.2. Disassembly of Side Panel L & R 12
9.3. Disassembly of Top Cabinet Unit 12
9.4. Disassembly of Deck P.C.B. and Tape Eject P.C.B. 12
9.5. Disassembly of Front Panel Assembly 13
9.6. Disassembly of Main Control P.C.B., Function P.C.B. and
Power-In P.C.B. 14
9.7. Disassembly of Panel P.C.B. 14
9.8. Disassembly of Rear Panel 15
9.9. Disassembly of Main P.C.B. 15
9.10. Disassembly of Transformer P.C.B. 16
9.11. Disassembly of Tuner Pack 16
9.12. Disassembly of Power P.C.B 17
9.13. Disassembly of CR16 Mechanism 17
9.14. Replacement of CD Lid 18
9.15. Replacement of Cassette Lid 19
9.16. Replacement of the Power IC and Transistors. 20
Power consumption 135 W
Dimensions (W x H x D) 175 x 254 x 390.7 mm
(6-89/100” x 10” x 15-19/50”)
Mass 5.44 kg (11.99 lbs.)
Power consumption in standby mode: 0.4 W
nSystem: SC-PM31P-S Music Center: SA-PM31P-S
Speaker: SB-PM31P-SJ
nSystem: SC-PM31PC-S Music Center: SA-PM31PC-S
Speaker: SB-PM31P-SJ
Notes:
1. Specifications are subject to change without notice.
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 refer
to High frequency and Low frequency.
9.17. Procedure for Replacing Pinch Roller and Head Block
(Cassette Mechanism Unit) 21
9.18. Procedure for Replacing Motor, Capstan Belt A, Capstan
Belt B, and Winding Belt (Cassette Mechanism Unit) 21
9.19. Procedure for Replacing Parts on Mechanism PCB 23
9.20. Replacement of CD traverse deck 23
9.21. Replacement of optical pickup unit (CD mechanism) 25
9.22. Replacement of a traverse gear A and a traverse gear B
26
9.23. Procedure for removing CD loading mechanism 27
9.24. CR16 mechanism disassembly procedure 27
9.25. CR16 MECHANISM ASSEMBLY PROCEDURE 34
9.26. Disassembly of traverse mechanism 46
9.27. Handling of Cassette Tape jam 47
10 Service Positions 48
10.1. Checking procedure 48
10.2. Checking the major P.C.B. 48
11 Self-Diagnostic Display Function 49
11.1. Entering into Self-Diagnostic Mode 49
11.2. Clearing Self-Diagnostic Memory 51
11.3. Displaying Self-Diagnostic Results 51
11.4. Error Code Table 52
11.5. Cassette Mechanism Self-Diagnostic Mode 52
11.6. Changer Reliability Test Mode 53
11.7. Changer Operation Checking 53
11.8. CR16 Mechanism Ageing Mode 54
12 Procedure for Checking Operation of Individual Parts of
Cassette Mechanism Unit 55
12.1. Operation Check with Cassette Tape 55
CONTENTS
Page Page
2
SA-PM31P / SA-PM31PC

12.2. Operation Check without Cassette Tape 55
13 Measurement And Adjustments 57
13.1. Tuner/CD Sections 57
13.2. Cassette Deck Section 57
14 Voltage Measurement and Waveform Chart 59
14.1. Waveform 62
15 Block Diagram 63
15.1. CD Servo Block 63
15.2. Main Block 65
16 Notes of Schematic Diagram 70
17 Schematic Diagram 71
17.1. CD Servo Circuit 71
17.2. Main Circuit 73
17.3. Main Control Circuit, Panel Circuit, Power-In Circuit and
Function Circuit 77
17.4. Deck Circuit, Deck Mechanism Circuit and Tape Eject
Circuit 79
17.5. Power Circuit 81
17.6. Transformer Circuit 84
17.7. CD Loading Circuit 85
18 Printed Circuit Board 86
18.1. CD Servo P.C.B. 86
18.2. Main P.C.B. 87
18.3. Main Control P.C.B. and Panel P.C.B. 89
18.4. Power In P.C.B., Function P.C.B. and Deck Mechanism
P.C.B. 90
18.5. Deck P.C.B. and Tape Eject P.C.B. 91
18.6. CD Loading P.C.B. 92
18.7. Power P.C.B. 93
18.8. Transformer P.C.B. 94
19 Wiring Connection Diagram 95
20 Illustration of IC 痴, Transistors and Diodes 97
21 Terminal Function of ICｴs 98
21.1. IC702 (MN6627953HB) Servo processor/ Digital signal
processor/ Digital filter/ D/A converter 98
21.2. IC703 (BA5948FPE2) IC 4CH DRIVE 98
21.3. IC302 (C2CBJG000574) MICRO PROCESSOR 99
22 Troubleshooting Flowchart (CD Section Circuit) 101
23 Parts Location and Replacement Parts List 103
23.1. Deck Mechanism 104
23.2. CD Loading Mechanism 106
23.3. Cabinet 111
23.4. Electrical Part List 114
23.5. Packaging Materials & Accessories Parts List 122
23.6. Packaging 122
3
SA-PM31P / SA-PM31PC

(This “Safety Precaution” is applied only in U.S.A.)
1 Safety Cautions
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.
1.1.3. CAUTION FOR FUSE REPLACEMENT
4
SA-PM31P / SA-PM31PC

2 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C506, C507, C508, C600, C601, C602, 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 (volume min) 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.
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.
5
SA-PM31P / SA-PM31PC

This unit utilizes a class 1 laser.
Invisible laser radiation is emitted from the optical pickup lens.
When the unit is turned on:
nUse of caution label (Except for U.S.A.)
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.
6
SA-PM31P / SA-PM31PC

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 (Fig 1).
3. Take care not to apply excessive stress to the flexible
board (FPC board).
4. Do not turn the variable resistor (laser power
adjustment). It has already been adjusted.
Fig 1
lGrounding for electrostatic breakdown prevention
1. Human body grounding (Fig 2)
Use the anti-static wrist strap to discharge the static
electricity from your body.
2. Work table grounding (Fig 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 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
7
SA-PM31P / SA-PM31PC

7 Accessories
AC power cord
FM indoor antenna
AM loop antenna
Remote control
Note : Refer to Packaging Materials & Accessories for the part number.
8
SA-PM31P / SA-PM31PC

8 Operating Procedures
9
SA-PM31P / SA-PM31PC

10
SA-PM31P / SA-PM31PC

9 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”.
9.1. 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.
11
SA-PM31P / SA-PM31PC

9.2. Disassembly of Side Panel L &
R
Step 1 : Remove 5 screws.
Step 2 : Remove 1 screw.
Step 3 : Remove the side panel as arrow shown (Be careful of
the catches).
Step 4 : Remove 5 screws.
Step 5 : Remove 1 screw.
Step 6 : Remove the side panel as arrow shown (Be careful of
the catches).
9.3. Disassembly of Top Cabinet
Unit
· Follow the (Step 1) - (Step 6) of Item 9.2.
Step 1 : Remove 1 screw.
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.
9.4. Disassembly of Deck P.C.B.
and Tape Eject P.C.B.
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
12
SA-PM31P / SA-PM31PC

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.
9.5. Disassembly of Front Panel
Assembly
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
Step 1 : Detach the connector CN308.
Step 2 : Detach the connector CN505.
13
SA-PM31P / SA-PM31PC

Step 3 : Release 2 catches and remove the front panel as
arrows shown.
Step 4 : Release the catch at the bottom cabinet as shown.
9.6. 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 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 4) of Item 9.5.
· Disassembly of Function P.C.B. and Power-In P.C.B.
Step 1 : Remove 5 screws.
Step 2 : Release 2 clutches and remove both Function P.C.B.
and Power-In P.C.B.
· Disassembly of Main Control P.C.B.
Step 3 : Remove 2 screws to remove the shield plate.
Step 4 : Remove 2 screws and flip the Main Control P.C.B. as
arrow shown.
Step 5 : Detach the connector CN603A.
9.7. Disassembly of Panel P.C.B.
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 4) of Item 9.5.
· Follow the (Step 1) - (Step 5) of Item 9.6.
14
SA-PM31P / SA-PM31PC

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.
9.8. Disassembly of Rear Panel
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
Step 1 : Detach the connector CN303.
Step 2 : Remove 9 screws.
Step 3: Remove the rear panel as arrows shown (Be careful of
the catches).
9.9. Disassembly of Main P.C.B.
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 3) of Item 9.8.
15
SA-PM31P / SA-PM31PC

Step 1 : Detach the connectors CN308, CN305 and CN306 .
Step 2 : Detach the connectors CN304 (pull the catch as arrow
shown), CN301 and CN302 and pull out the Main P.C.B as
arrow shown.
9.10. Disassembly of Transformer
P.C.B.
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 3) of Item 9.8.
Step 1 : Detach the connectors CN505 and CN506.
Step 2 : Remove 4 screws and pull out the Transformer P.C.B.
as arrow shown.
9.11. Disassembly of Tuner Pack
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 3) of Item 9.8.
16
SA-PM31P / SA-PM31PC

Step 1 : Detach the connector CN101 and remove the tuner
pack as arrow shown.
9.12. Disassembly of Power P.C.B
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 4) of Item 9.5.
· Follow the (Step 1) - (Step 3) of Item 9.8.
· Follow the (Step 1) - (Step 2) of Item 9.9.
· Follow the (Step 1) - (Step 2) of Item 9.10.
Step 1 : Remove 4 screws.
Step 2 : Remove the Power P.C.B. as arrow shown (be careful
of the catch).
9.13. Disassembly of CR16
Mechanism
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 4) of Item 9.5.
Step 1 : Remove 2 screws.
Step 2 : Detach the connectors CN305 and CN306.
Step 3 : Remove the tape which used to secure the FFC
connectors.
17
SA-PM31P / SA-PM31PC

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.
9.14. Replacement of CD Lid
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 4) of Item 9.5.
Step 1 : Remove 2 screws and the 2 CD lid supports.
Step 2 : Push the spring as arrow shown.
18
SA-PM31P / SA-PM31PC

Step 3 : Remove the CD lid as arrow shown.
9.15. Replacement of Cassette Lid
· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 4) of Item 9.4.
Step 1 : Remove 1 screw and the damper gear.
Step 2 : Remove the cassette open spring as arrows shown in
order.
Step 3 : Pull both sides’ cassette holders to the direction of the
arrows shown.
Step 4 : Remove the cassette lid as arrow shown.
19
SA-PM31P / SA-PM31PC

· Follow the (Step 1) - (Step 6) of Item 9.2.
· Follow the (Step 1) - (Step 3) of Item 9.3.
· Follow the (Step 1) - (Step 3) of Item 9.8.
· Follow the (Step 1) - (Step 2) of Item 9.9.
· Follow the (Step 1) - (Step 2) of Item 9.10.
· Follow the (Step 1) - (Step 2) of Item 9.12.
Step 1 : Remove 2 screws.
Step 2 : Remove 2 screws.
Step 3 : Unsolder the Power IC500.
Step 4 : Unsolder the Transistors Q501 and Q502.
9.16. Replacement of the Power IC and Transistors.
20
SA-PM31P / SA-PM31PC