Panasonic SA-AKX74LM-K User manual

© Panasonic Corporation 2012. All rights reserved.
Unauthorized copying and distribution is a violation
of law.
PMX1207007CE
CD Stereo System
Model No. SA-AKX74LM-K
Product Color: (K)...Black Type
Please refer to the original service manual for:
CD Mechanism Unit (BRS11C), Order No. PSG1201019AE
Speaker system SB-AKX74LM-K, Order No. PMX1207006CE

TABLE OF CONTENTS
1 Safety Precautions
1.1. General Guidelines
1.3. Before Repair and Adjustment
1.4. Protection Circuitry
1.5. Caution For Fuse Replacement
1.6. Safety Parts Information
2 Warning
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatic Sensitive (ES) Devices
2.2. Precaution of Laser Diode
2.3. Service caution based on Legal restrictions
2.4. Handling Precautions for Traverse Unit
3 Service Navigation
3.1. Service Information
4 Specifications
5 General/Introduction
5.1. Media Information
6 Location of Controls and Components
6.1. Remote Control Key Button Operation
6.2. Main Unit Key Button Operation
7 Installation Instructions
7.1. Speaker and A/C Connection
8 Service Mode
8.1. Cold-Start
8.2. Doctor Mode Table
8.3. Reliability Test Mode (CD Mechanism Unit
(BRS11C))
8.4. Self-Diagnostic Mode
8.5. Self-Diagnostic Error Code Table
Please refer to the original service manual for:
CD Mechanism Unit (BRS11C), Order No. PSG1201019AE
Speaker system SB-AKX74LM-K, Order No. PMX1207006CE
Nota: El idioma original de este Manual de Servicio es en idioma inglés, sin embargo algunas notas
aquí mencionadas serán escritas en español para mejor descripción para Centros de Servicio de México.
2

8.6. Sales Demonstration Lock Function
9 Troubleshooting Guide
9.1. Part Location
9.2. Troubleshooting Guide for F61 and/or F76
9.3. D-Amp IC Operation & Control
10 Service Fixture & Tools
11 Disassembly and Assembly Instructions
11.1. Disassembly Flow Chart
11.2. Main Components and P.C.B. Locations
11.3. Disassembly of Top Cabinet
11.4. Disassembly of Front Panel Unit
11.5. Disassembly of Mic P.C.B.
11.6. Disassembly of Panel P.C.B.
11.7. Disassembly of Memory LED P.C.B.
11.8. Disassembly of Remote Sensor P.C.B.
11.9. Disassembly of USB P.C.B.
11.10. Disassembly of Music Port P.C.B.
11.11. Disassembly of Top Bar LED P.C.B.
11.12. Disassembly of Bottom Bar LED P.C.B.
11.13. Disassembly of Main P.C.B.
11.14. Replacement of Voltage Regulator IC
(IC2010)
11.15. Replacement of Voltage Regulator IC
(IC2011)
11.16. Replacement of Audio Digital Amp IC
(IC5800)
11.17. Replacement of Audio Digital Amp IC
(IC5700)
11.18. Disassembly of D-Amp P.C.B.
11.19. Replacement of Audio Digital Amp IC
(IC5900)
11.20. Disassembly of SMPS P.C.B.
11.21. Replacement of Switching Regulator IC
(IC5701)
11.22. Replacement of Rectifier Diode (D5702)
11.23. Replacement of Rectifier Diode (D5801)
11.24. Replacement of Rectifier Diode (D5802)
11.25. Replacement of Regulator Diode (D5803)
11.26. Disassembly of CD Mechanism Unit
(BRS11C)
11.27. Disassembly of CD Interface P.C.B.
11.28. Disassembly of CD Servo P.C.B.
11.29. Disassembly of Rear Panel
12 Service Position
12.1. Checking and Repairing of Main P.C.B.
12.2. Checking and Repairing of D-Amp P.C.B.
12.3. Checking and Repairing of Panel P.C.B.
12.4. Checking and Repairing of SMPS P.C.B. -
12.5. Checking and Repairing of CD Servo P.C.B.
(Side A)
12.6. Checking and Repairing of CD Servo P.C.B.
(Side B)
13 Simplified Block Diagram
13.1. Power Block Diagram
14 Block Diagram
14.1. Servo & System Control
14.2. IC Terminal Chart
14.3. Audio
14.4. Power Supply
15 Wiring Connection Diagram
16 Schematic Diagram
16.1. Schematic Diagram Notes
16.2. CD Servo Circuit
16.3. Main(MICON) Circuit
16.4. Main(D-Amp) Circuit
16.5. Panel Circuit
16.6. Remote Sensor, USB, Music Port , Memory
LED, Top Bar LED and Bottom Bar LED
Circuit
16.7. CD Interface, Mic and Voltage Selector Circuit
16.8. D-Amp Circuit
16.9. SMPS Circuit
17 Printed Circuit Board
17.1. CD Servo P.C.B.
17.2. Main P.C.B. (Side A)
17.3. Main P.C.B. (Side B)
17.4. Panel, Remote Sensor, USB and Music Port
P.C.B.
17.5. Memory LED, CD Interface, Top Bar LED,
Bottom Bar LED and Mic P.C.B.
17.7. SMPS and D-Amp P.C.B.
18 Appendix Information of Schematic Diagram
18.1. Voltage & Waveform Chart
18.2. Illustration of ICs, Transistor and Diode
18.3. Terminal Function of ICs
19 Exploded View and Replacement Parts List
19.1. Exploded View and Mechanical replacement
Part List
19.2. Electrical Replacement Part List
3

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, 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 ohmmeter, 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 1M:and 5.2M:.
When the exposed metal does not have a return path to the chassis, the reading must be
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 0.15PF 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. 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
4

1.3. Before Repair and Adjustment
Disconnect AC power to discharge unit AC Capacitors as such (C5700, C5701, C5703, C5708)
through a 10 Ω, 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 127 V, 60 Hz in Power ON, FM Tuner, No Signal, volume minimal mode should be ~ 750 mA.
1.4. 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.
1.5. Caution For Fuse Replacement
5

1.6. 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 Schematic Diagrams, 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.
Modelo: SC-AKX74LM-
K
Safety
OPTOACOPLADOR B3PBA0000503
Nota: El Optoacoplador B3PBA0000503
cambiara por el B3PBA0000597 con la TI
A12031 Running Change
La pista de SMPS Cambiara Con la TI
A12037 de RJB3568A a RJB3568A -1 (
Running Change )
INSTRUCTIVO RQTM0189
RQTM0189-1
RKMX1011Z-KL
RD-DDL100-PX
F1BAF1020020
ERZV05Z471CS
PCB SMPS
F0CAF224A105
B3PBA0000579
RJB3568A
RJB3568A-1
GAB. MET. SIN DOBLAR
G0B932H00002
REAR PANEL
CAPACITOR DE AC
Número de Parte
TRANSFORMADOR DE PODER
TRANSFORMADOR DE
RESPALDO
CABLE TOMACORRIENTE.
CONECTOR TOMACORRIENTE
OPTOACOPLADOR
BRS1C CD UNIT
BOBINA PRIMARIO
FUSIBLE PRIMARIO
CAPACITOR DE AC
CAPACITOR DE AC
CAPACITOR DE AC
ZNR
Nombre del componente
K2CB2YY00059
ETS19AB2E6AG
K5D802APA008
F1BAF471A013
K2AB2B000007
G4DYZ0000060
RXTM0002H-A
F0CAF104A105
6

2 Warning
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 Elec-
trostatically 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 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 electrical assembly equipped with ES devices, place the assembly on a conductive surface such as alumi-
num 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 compara-
ble 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).
7

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 pickup: 100 PW/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.
8

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 process of all electrical components on the printed circuit boards 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 mainly consists of tin
(Sn), silver (Ag) and Copper (Cu), and the melting point of the lead free solder is higher approx.30 degrees C (86qF) more than that
of the normal solder.
Definition of PCB Lead Free Solder being used
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 the 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 control after setting the temperature at 350±30 degrees
C (662±86qF).
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%
The letter of “PbF” is printed either foil side or components side on the PCB using the lead free solder.
(See right figure)
9

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 generating 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 unit 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 flexi-
ble cable, cut off the antistatic FPC.
10

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 electric-
ity 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.
11

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 followed by supplement service manual to be filed with original service
manual.
•CD Mechanism Unit (BRS11C):
1) This model uses CD Mechanism Unit (BRS11C).
•Micro-processor:
1) The following components are supplied as an assembled part.
- Micro-processor IC, IC2003 (MN101EF16KXW) Este material se encuentra sin programar, debe ser programado.
•Speaker System:
1) This model uses Speaker System, SB-AKX54, SB-WAKX74LM-K.
12

4 Specifications
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Consumo de energía en modo de espera
13

5 General/Introduction
5.1. Media Information
14

6 Location of Controls and Components
6.1. Remote Control Key Button Operation
15

6.2. Main Unit Key Button Operation
16

7 Installation Instructions
7.1. Speaker and A/C Connection
17

8 Service Mode
8.1. Cold-Start
Here is the procedure to carry out cold-start or initialize to shipping mode.
1. Unplug AC power cord
2. Press & hold [POWER] button
3. Plug AC power cord while [POWER] button being pressed
FL Display will show “_ _ _ _ _ _ _ _”
4. Release [POWER] button
18

8.2. Doctor Mode Table
8.2.1. Doctor Mode Table 1
FL Display
Key Operation
Front Key
Item
DescriptionMode Name
Doctor Mode
EEPROM
checksum
check
(Decimal)
To enter into Doctor Mode In CD Mode:
1. Press [ ] button on
main unit follow by [4]
and [7] on remote
control.
In CD mode:
1. Enter Doctor Mode
2. To exit, press [DELETE]
button on remote control
Displaying of
1. Year Develop.
2. Model Type.
3. ROM Type.
4. Firmware Version.
23 41
Version No. (001 ~ 999) specific for each firmware
Cold Start To active cold start upon next AC
power up when reset start is
execute the next time .
In Doctor Mode :
1. Press [SLEEP] button
on remote control.
or, press [POWER, /I] button
on Main Unit
19

8.2.2. Doctor Mode Table 2
FL Display
Key Operation
Front Key
Item
DescriptionMode Name
Volume Setting
Check
FL Display
Check
To check the volume setting of a main
unit.
To check the FL segment display
All segment will light up while all LED
blink at 0.5s,intervals.(if any)
In Doctor Mode :
1. Press [7], [8], [9] button
on remote control.
In Doctor mode :
1. Press [1] button on
remote control.
Press [7]: VOL50
Press [8]: VOL35
Press [9]: VOL0
Volume
In this mode, the tray will open &
close.
Note: Refer to Section 8.3 Fig 1 for
process flow .
The counter will
increment by one .
When reach 9999
will change to 0000
Cancellation Display
BRS11C Reliability
Test (Loading)
To determine CD Mechanism Unit
(BRS11C) Open/Close operation.
Note: Refer to Section 8.3 Fig 2. for
process flow .
The counter will
increment by one .
When reach 9999
will change to 0000
Cancellation Display
BRS11C Reliability
Test (Traverse)
Test
To determine CD Mechanism BRS11C
Access Inner & Outer disc operation.
Note: Refer to Section 8.3 Fig 3. for
process flow .
The counter will
increment by one .
When reach 9999
will change to 0000
Cancellation Display
BRS11C Reliability
(Combination)
In this mode,ensure the CD is in the
main unit.
To determine CD Mechanism Unit
(BRS11C) Open/Close & Access Inner &
Outer Disc Operation.
In this mode,ensure the CD is in the
main unit.
In Doctor Mode :
1. Press [10] [2] [1] button
on remote control.
2. To cancel, press [0]
on remote control.
In Doctor Mode :
1. Press [10] [1] [2] button
on remote control.
2. To cancel, press [0]
on remote control.
2. To cancel, press [0 ]
on remote control.
In Doctor Mode :
1. Press [10] [1] [5] button
on remote control.
2. To cancel, press [0]
on remote control.
20