Panasonic SCEN-29-EB Service manual

CD Stereo System

SC-EN29EB

Colour

(S)............Silver Type

System

lSC-EN29EB

Main Unit: SA-EN29EB

Speakers: SB-EN7P

ORDER NO.AD0604020CE

Specification

Main Unit

Radio

Frequency range

87.50 - 108.00 MHz (50 kHz steps)

M 522 - 1629 kHz (9 kHz steps)

DAB

Frequency range

Band III 5A-13F (174.928-239.200 MHz)

CD Player

Sampling frequency 44.1kHz

Decoding 16 bit linear

Beam source

Semiconductor laser (wavelength 780 nm)

Number of channels 2 channel, stereo

Wow and flutter

Less than possible measurement data

D/A converter MASH (1 bit DAC)

Teminals

Input AUX: 3.5 mm stereo (27 kΩ)

DAB EXT ANT: F-Connector (75 Ω)

Output PHONES: 3.5 mm stereo (32 Ω)

LINE OUT: 3.5 mm stereo (2.2 kΩ)

General

Power supply AC230-240V,50Hz

C adaptor DC 13 V, 1.5 A

Power consumption 30 W

Dimensions (W x H x D) 240 x 216 x 170 mm

Speakers

Full range 8cm,3Ω ×2

Ceramic tweeter 1.52 cm × 2

Dimensions (W x H x D) 107 x 230 x 165 mm

Mass

With speakers 3.1 kg

Without speakers 1.7 kg

Power consumption in standby mode

2.6 W

Notes:

1.Specifications are subject to change without notice.

2.Mass and dimensions are approximate.

SC-EN29EB

CONTENTS

Page Page

1 Caution for AC Mains Lead 3

2 Protection Circuitry

3 Accessories

4 Handling Precautions For Traverse Deck (Optical Pickup)

5 Precaution of Laser Diode

6 Prevention of Electro Static Discharge (ESD) To

Electrostatically (ES) Devices

7 Handling the Lead-free Solder

7.1. About lead free solder (PbF)

8 Control Guide

9 Operation Checks and Component Replacement Procedures

9.1. SA-EN29

9.2. SB-EN7

10 Self Diagnostic Function

10.1. Setting of self diagnostic Function

10.2. Error Code

11 Description of Error Code

11.1. Error detection for CD Mechanism block

12 Block Diagram

13 Schematic Diagram

13.1. Schematic Diagram Notes

13.2. CD Servo Circuit Diagram

13.3. Main etc. Circuite Diagram

13.4. Tuner Circuit Diagram

13.5. Dab Terminal Circuit Diagram

13.6. Schematic Diagram (SB-EN7)

13.7. Voltage Varue

14 Printed Circuit Board Diagram

14.1. CD SERVO P.C.B.

14.2. Printed Circuit Board Diagram

15 Wiring Connection Diagram

16 Measurements and Adjustments

16.1. Tuner Adjustment

17 Terminal Functions of ICs

18 Replacement Parts List

18.1. SA-EN29

18.2. SB-EN7

19 Cabinet Parts Location

19.1. SA-EN29

19.2. SB-EN7

20 Packaging

1 Caution for AC Mains Lead

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2 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.

· Stop 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 with an impedance less than the indicated rated impedance of the amplifier are used.

If this occurs, follow the procedure outline 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.

3 Accessories

· Remote control (EUR7711130)............1pc.

· AC adaptor (RFAW2646)........................1pc.

· AM loop antenna (G0zz000020 36).......1pc.

· DAB “T” antenna (N1EADY000001).....1pc.

· Battery........................................................2pcs.

4 Handling Precautions For Traverse Deck (Optical

Pickup)

The laser diode in the traverse deck (optical pickup) may break down due to potential 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 flexible board (FFC board) (Figure 1).

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.

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

· Grounding for electrostatic breakdown prevention

1. Human body grounding (Figure 2)

Use the anti-static wrist strap to discharge the static electricity from your body.

2. Work table grounding (Figure 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.

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5 Precaution of Laser Diode

Caution :

This product utilizes a laser diode with the unit turned "ON", invisible laser radiation is emitted from the pick up lens. Wavelength : 780 nm Maximum output radiation power from pick up : 100 µW/VDE Laser radiation from pick up unit is safety level, but be sure the followings:

1. Do not disassemble the optical pick up unit, since radiation from exposed laser diode is dangerous.

2. Do not adjust the variable resistor on the pick up unit. It was already adjusted.

3. Do not look at the focus lens using optical instruments.

4. Recommend not to look at pick up lens for a long time.

ACHTUNG :

Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand wird unsichtbare Laserstrahlung von der Lasereinheit abgestrahlt. Wellenlänge : 780nm Maximale Strahlungsleistung der Lasereinheit :100 µW/VDE Die Strahlung an der Lasereinheit ist ungefährlich, wenn folgende Punkte beachtet werden:

1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten Laserdiode gefährlich ist.

2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen.

3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.

4. Nicht über längere Zeit in die Fokussierlinse blicken.

ADVARSEL: I dette a apparat anvendes laser.

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.

n Use of caution label

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6 Prevention of Electro Static Discharge (ESD) To

Electrostatically (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES Devices are integrated circuits and some field-effect transistors and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge (ESD).

1. Immediately before handlin g any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, Which should be removed for potential shock resons prior to applyin g power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as alminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal devices. Some solder removal devices not classified as “anti-static (ESD protected)” can generate electrical charge sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conduc tive foam, alminum foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpack aged replacement ES devices.(Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device).

7 Handling the Lead-free Solder

7.1. About lead free solder (PbF)

Distinction of PbF P.C.B.:

P.C.B.s (manufacture d) 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 the soldering iron with temperature control, please set it to 700± 20 °F (370 ± 10°C).

· Pb free solder will tent to splash when heated too high (about 1100°F/600°C).

· W hen soldering or unsoldering, please completely remove all of the solder on the pins and solder area, and be sure to heat

the soldering points with the Pb free solder until it melts enough.

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8 Control Guide

9 Operation Checks and Component Replacement

Procedures

9.1. SA-EN29

9.1.1. Checking for the power P.C.B.

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· Check the power P.C.B. as shown below.

9.1.2. Checking for the LCD P.C.B.

· Follow the (Step1) - (Step3) of item 9.1.1.

· Check the LCD P.C.B. as shown below.

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9.1.3. Checking for the main P.C.B., tuner P.C.B. and loading motor P.C.B.

· Follow the (Step1) - (Step3) of item 9.1.1.

· Follow the (Step1) - (Step6) of item 9.1.2.

· Check the main P.C.B., tuner P.C.B. and loading motor

P.C.B. as shown below.

9.1.4. Checking for the CD servo P.C.B.

· Follow the (Step1) - (Step3) of item 9.1.1.

· Follow the (Step1) - (Step6) of item 9.1.2.

· Follow the (Step1) - (Step3), (Step5) of item 9.1.3.

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· Checking the CD servo P.C.B. as shown below.

9.1.5. Replacement for the traverse motor

· Follow the (Step1) - (Step3) of item 9.1.1.

· Follow the (Step1) - (Step6) of item 9.1.2.

· Follow the (Step1) - (Step3), (Step5) of item 9.1.3.

· Follow the (Step1) - (Step7) of item 9.1.4.

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9.1.6. Replacement for the optical pickup

· Follow the (Step1) - (Step3) of item 9.1.1.

· Follow the (Step1) - (Step6) of item 9.1.2.

· Follow the (Step1) - (Step3), (Step5) of item 9.1.3.

· Follow the (Step1) - (Step7) of item 9.1.4.

· Follow the (Step1) - (Step3) of item 9.1.5.

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9.1.7. Replacement for the rest switch

· Follow the (Step1) - (Step3) of item 9.1.1.

· Follow the (Step1) - (Step6) of item 9.1.2.

· Follow the (Step1) - (Step3), (Step5) of item 9.1.3.

· Follow the (Step1) - (Step7) of item 9.1.4.

· Follow the (Step1), (Step2) of item 9.1.5.

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9.1.8. Replacement for the motor

· Follow the (Step1) - (Step3) of item 9.1.1.

9.1.9. Replacement for the gear holder, gear A ass’y, gear B and rack

· Follow the (Step1) - (Step3) of item 9.1.1.

· Follow the (Step1) - (Step6) of item 9.1.2.

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· Follow the (Step1) - (Step3), (Step5) of item 9.1.3.

· Follow the (Step1) - (Step7) of item 9.1.4.

9.1.10. Replacement for the CD lid unit and CD eject P.C.B.

· Follow the (Step1) - (Step3) of item 9.1.1.

· Follow the (Step1) - (Step6) of item 9.1.2.

· Follow the (Step1) - (Step3), (Step5) of item 9.1.3.

· Follow the (Step1) - (Step6) of item 9.1.4.

· Follow the (Step1) - (Step4) of item 9.1.9.

9.1.11. Replacement for the CD traveller holder and CD traveller upper

· Follow the (Step1) - (Step3) of item 9.1.1.

· Follow the (Step1) - (Step6) of item 9.1.2.

· Follow the (Step1) - (Step3), (Step5) of item 9.1.3.

· Follow the (Step1) - (Step7) of item 9.1.4.

· Follow the (Step1) - (Step4) of item 9.1.9.

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9.2. SB-EN7

9.2.1. Removal of the net catch gum

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9.2.2. Removal of the speaker(Woofer)

9.2.3. Removal of the speaker(Tweeter)

· Follow the (Step1), (Step2) of item 9.2.2.

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