Panasonic SA-AKX14P Schematic

CD Stereo System

Model No. SA-AKX14P

Product Color: (K)...Black Type

PSG1203032AE

Please refer to the original service manual for:

1) SA-AKX14P is base on SA-AKX14PN- K, Orde r No. PSG1 20 1 003 CE.

2) CD Mechanism Unit (BRS1C), Order No. PSG1102001CE.

3) Speaker system SB-AKX14P-K, Order No. PSG1203033AE.

TABLE OF CONTENTS

PAGE PAGE

1 Safety Precautions----------------------------------------------- 3

1.1. General Guidelines---------------------------------------- 3

1.2. Before Repair and Adjustment ------------------------- 3

1.3. Protection Circuitry---------------------------------------- 3

1.4. Caution For Fuse Replacement ------------------------ 4

1.5. Safety Parts Information -------------------------------- 4

2 Warning-------------------------------------------------------------- 5

2.1. Prevention of Electrostatic Discharge (ESD)

2.2. Precaution of Laser Diode-------------------------------6

2.3. Service caution based on Legal restrictions --------7

2.4. Handling Precautions for Traverse Unit--------------8

3 Se rvice Navigation ---------------------------------------------10

3.1. Service Information--------------------------------------10

3.2. Differences Table ---------------------------------------- 11

to Electrostatic Sensitive (ES) Devices---------------5

4 Specifications ----------------------------------------------------12 5 Block Diagram ---------------------------------------------------13

5.1. Power Supply ---------------------------------------------13

6 Schematic Diagram---------------------------------------------15

6.1. Main Circuit ------------------------------------------------15

6.2. SMPS Circuit ----------------------------------------------19

7 Printed Circuit Board ------------------------------------------21

7.1. Main P.C.B. & Tuner P.C.B. -------------------------- -21

7.2. Panel, LCD, Remote Sensor & USB P.C.B.-------22

7.3. SMPS P.C.B.----------------------------------------------23

8 Exploded View and Replacement Parts List-----------24

8.1. Explo ded View and Mechanical Replacement Parts List ---------------------------------------------------24

8.2. Electrical Replacement Parts List--------------------29

1 Safety Precautions

1.1. General Guidelines

1. Wh en 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, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed.

3. After servicing, carry out the following leakage current checks to prevent the customer from being exposed to shock hazards.

1.1.1. Leakage Current Cold Check

1. Unplug the AC cord and connect a jumper between the two prongs on the plug.

2. Measure the resistance value, with an o hmmeter, 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 th e chassis, the reading should be between 1M and 5.2M. When the exposed metal does not have a return path to the chassis, the reading must be

(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 re turning the serviced equip ment to the customer, be sure to make the following insulation resistance test to prevent the customer from being exposed to a shock hazard.

1.1.2. Leakage Current Hot Check

1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

2. Connect a 1.5k, 10 watts resistor, in parallel with a 0.15F 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. Th e 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. In case a measurement is outside of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer.

Figure 1

1.2. Before Repair and Adjustment

Disconnect AC power to discharge unit AC Capacitors as such (C5700, C5701, C5703, C5704, C5705, C5708) through a 10 , 10 W resistor to ground.

Caution:

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 Power ON, FM Tuner, No Signal, Volume minimal mode should be ~ 500 mA

1.3. 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.

1.4. Caution For Fuse Replacement

1.5. Safety Parts Information

Safety Parts List:

There are special components used in this equipment which are important for safety. These parts are marked by ( ) in the Exploded View & Replacement Parts List. It is essential that these critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of manufacturer.

Safety Ref No. Part No. Part Name & Description Remarks

20 RKMX1011-K1 TOP CABINET

21 RGRX1008K-F REAR PANEL

301 RAEX1033Z-V TRAVERSE ASS'Y

A2 K2CB2YY00059 AC CORD

A3 RQT9691-1P O/I BOOK (En)

PCB8 REP4783AA SMPS P.C.B. (RTL)

DZ5701 ERZVA5Z471 ZNR

L5701 G0B932H00002 LINE FILTER

T5701 G4DYZ0000057 MAIN TRANSFORMER

T5751 ETS19AB2E6AG SUB TRANSFORMER

PC5701 B3PBA0000503 PHOTO COUPLER

PC5702 B3PBA0000503 PHOTO COUPLER

PC5720 B3PBA0000503 PHOTO COUPLER

PC5799 B3PBA0000503 PHOTO COUPLER

F1 K5D802APA008 FUSE

TH5702 D4CAA2R20001 THERMISTOR

TH5860 D4CC11040013 THERMISTOR

TH5900 D4CC11040013 THERMISTOR

P5701 K2AB2B000007 AC INLET

R5708 ERJ8GEYJ155V 1.5M 1/4W

R5709 ERJ8GEYJ155V 1.5M 1/4W

C5700 F1BAF471A013 470pF

C5701 F0CAF104A105 0.1uF

C5703 F0CAF224A105 0.22uF

C5704 F1BAF471A013 470pF

C5705 F1BAF471A013 470pF

C5708 F1BAF1020020 1000pF

2Warning

2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatic Sensitive

(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 damag e caused by electrostatic discharge (ESD).

1. Immediately before handling 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 reasons prior to applying power to the unit under test.

2. After removing an e lectrical a ssembly equip ped with ES d evices, plac e the assembly o n a conductive surface such as al uminum 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 device. 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 conductive foam, aluminum 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 unpackaged 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) suf-

ficient to damage an ES device).

2.2. Precaution of Laser Diode

Caution:

This product utilizes a laser diode with the unit turned “on”, invisible laser radiation is emitted from the pickup lens. Wavelength: 790 nm (CD) Maximum output radiation power from pick up : 10 0 W/VDE Laser radiation from the pickup unit is safety level, but be sure the followings:

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

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

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

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

2.3. Service caution based on Legal restrictions

2.3.1. General description about Lead Free Solder (PbF)

The lead free solder has been used in the mounting proce ss of a ll electrical components on the printed circuit board s used for this equipment in considering the globally environmental conservation.

The normal solder is the alloy of tin (Sn) and lead (Pb). On the other hand, the lead free solder is the alloy ma inly consists of tin (Sn), silver (Ag) and Copper (Cu), and the melting point of the lead free solder is higher approx.30 degrees C (86F) more than that of the normal solder.

Definition of PCB Lead Free Solder being used

The letter of “PbF” is printed either foil side or components side on the PCB using the lead free solder.

(See right figure)

Service caution for repair work using Lead Free Solder (PbF)

• The lead free solder has to be used when repairing the equipment for which the lead free solder is used. (Definition: The letter of “PbF” is printed on the PCB using the lead free solder.)

• To put lead free solder, it should be well molten and mixed with the original lead free solder.

• Remove the remaining lead free solder on the PCB cleanly for soldering of the new IC.

• Since the melting point of the lead free solder is higher than that of th e normal lead solder, it takes the longer time to melt the lead free solder.

• Use the soldering iron (more than 70W) equipped with the temperature con trol after setting the temperatu re at 350±30 degrees C (662±86F).

Recommended Lead Free Solder (Service Parts Route.)

• The following 3 types of lead free solder are available through the service parts route. RFKZ03D01K-----------(0.3mm 100g Reel) RFKZ06D01K-----------(0.6mm 100g Reel) RFKZ10D01K-----------(1.0mm 100g Reel)

Note

* Ingredient: tin (Sn), 96.5%, silver (Ag) 3.0%, Copper (Cu) 0.5%, Cobalt (Co) / Germanium (Ge) 0.1 to 0.3%

2.4. Handling Precautions for Traverse Unit

The laser diode in the optical pickup unit may break down due to static electricity of clothes or human body. Special care must be taken avoid caution to electrostatic breakdown when servicing and handling the laser diode in the traverse unit.

2.4.1. Cautions to Be Taken in Handling the Optical Pickup Unit

The laser diode in the optical pickup unit may be damaged due to electrostatic discharge gene rating from clothes or human body. Special care must be taken avoid caution to electrostatic discharge damage when servicing the laser diode.

1. Do not give a considerable shock to the optical pickup unit as it has an extremely high-precise structure.

2. To prevent the laser diode from the electrostatic discharge damage, the flexible cable of the optical pickup uni t removed should be short-circuited with a short pin or a clip.

3. The flexible cable may be cut off if an excessive force is applied to it. Use caution when handling the flexible cable.

4. The antistatic FPC is connected to the new optical pickup unit. After replacing the optical pickup unit and connecting the flexible cable, cut off the antistatic FPC.

2.4.2. Grounding for electrostatic breakdown prevention

Some devices such as the DVD player use the optical pickup (laser diode) and the optical pickup will be damaged by static electricity in the working environment. Proceed servicing works under the working environment where grounding works is completed.

2.4.2.1. Worktable grounding

1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed, and ground the sheet.

2.4.2.2. Human body grounding

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

3 Service Navigation

3.1. Service Information

This service manual contains technical information which will allow service personnel’s to understand and service this model. Please place orders using the parts list and not the drawing reference numbers.

If the circuit is changed or modified, this information will be follow ed by supplement service manual to be filed with origi nal service manual.

• CD Mechanism unit (BRS1C):

1) This model uses CD Mechanism Unit (BRS1C).

• Micro-processor:

1) The following components are supplied as an assembled part.

- Micro-processor IC, IC2003 (RFKWMAKX14M0)

• Speaker system:

1) This model uses Speaker System, SA-AKX14P-K.

• Base model:

1) The base is SA-AKX14PN-K. As such this service manual does not contain the following information as below:-

• Location of Controls and Components

• Self-Diagnostic and Special Mode Setting

• Troubleshooting Guide

• Disassembly and Assembly Instructions

• Replacement of Traverse Unit

• Simplified Block Diagram

• Block Diagram (except Power Supply)

• Wiring Connection Diagram

• Schematic Diagram (except Main Circuit & SMPS Circuit)

• Printed Circuit Board (CD Servo P.C.B. only)

• Voltage & Waveform Chart

• Illustration of IC, Transistor & Diode

• Terminal Function of ICs

3.2. Differences Table

Ref No. Part No. Part Name & Description Remarks

SA-AKX14PN-K SA-AKX14P-K 18 RFKGAKX14PHK RFKGAKX14P-K FRONT PANEL ASS'YL 21 RGRX1008K-A RGRX1008K-F REAR PANEL A3 RQT9609-1M RQT9691-1P O/I BOOK (En) P1 RPG9738 RPG0A44 PACKING CASE PCB2 REP4743AA REP4743EA MAIN P.C.B. PCB3 REP4743AB REP4743EB PANEL P.C.BL PCB4 REP4743AC REP4743EC LCD P.C.B. PCB5 REP4743AD REP4743ED USB P.C.B. PCB6 REP4743AE REP4743EE REMOTE SENSOR P.C.B. PCB8 REP4783AA REP4783HA SMPS P.C.B.

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