Panasonic SA-AK785LM-K User manual

© Panasonic Corporation 2009. All rights reserved.
Unauthorized copying and distribution is a violation
of law.
MEX0911001CE
CD Stereo System
Mode
Rev. 01
l No. SA-AK785LM-K
Product Color: (K)...Black Type
Notes: This model’s CD Mechanism Unit (CR14C). Please refer to the Original Service Manual
(Order No. MD0805031CE) for this CD Mechanism Unit.
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.
SH-FX785 SB-AK785 SB-AK785SB-AK780 SB-AK780SA-AK785
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TABLE OF CONTENTS
1 Safety Precautions
1.1. General Guidelines
1.3. Caution For Fuse Replacement
1.4. Before Repair and Adjustment
1.5. Protection Circuitry
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 Location of Controls and Components
5.1. Main Unit Key Button Operation
5.2. Remote Control Key Button Operation
5.3. Disc Information
6 Self-Diagnosis and Special Mode Setting
6.1. Doctor Mode Summary Table
6.2. Doctor Mode Table
6.3. Service Mode Summary Table
6.4. Service Mode Table
6.5. Reliability Test Mode (CD Mechanism Unit
CR14C)
6.6. Error Code Table
7 Troubleshooting Guide
7.1. Jupiter USB
7.2. Troubleshooting Guide
7.3. Troubleshooting Guide for F61 and/or F76
8 Service Fixture & Tools
8.1. Service Tools and Equipment
9 Disassembly and Assembly Instructions
9.1. Disassembly Flow Chart
9.2. Main Components and P.C.B. Locations
9.3. Disassembly of Top Cabinet
9.4. Disassembly of CD Mechanism Unit (CR14C)
9.5. Disassembly of Rear Panel
9.6. Disassembly of Fan Unit
9.7. Disassembly of Front Panel Assembly
9.8. Disassembly of Mic P.C.B.
9.9. Disassembly of Panel P.C.B.
9.10. Disassembly of Dynamic Bass Knob &
Dynamic Bass Button Unit
9.11. Disassembly of Memory P.C.B.
9.12. Disassembly of MPort/Headphone P.C.B.
9.13. Disassembly of CD Servo P.C.B.
9.14. Disassembly of D-Amp P.C.B. & Fan
9.15. Replacement of Audio Digital Amp IC
(IC5400)
9.16. Replacement of Audio Digital Amp IC
(IC5000)
9.17. Replacement of Audio Digital Amp IC
(IC5200)
9.18. Disassembly of Main P.C.B.
9.19. Disassembly of SMPS P.C.B.
9.20. Replacement of Switching Regulator IC
9.21. Replacement of Rectifier Diode (D5702)
9.22. Replacement of Regulator Diode (D5801)
9.23. Replacement of Regulator Diode (D5802)
9.24. Replacement of Regulator Diode (D5803)
9.25. Disassembly of AC Inlet P.C.B.
9.26. Disassembly of Jupiter P.C.B.
9.27. Replacement of Traverse Unit Assembly
9.28. Disassembly of CD Lid
10 Service Position
10.1. Checking and Repairing of Main P.C.B.
10.2. Checking and Repairing of Panel P.C.B., MIC
P.C.B., Jupiter P.C.B. and MPort/Headphone
P.C.B.
10.3. Checking and Repairing of D-Amp P.C.B.
10.4. Checking and Repairing of SMPS P.C.B. and
AC Inlet P.C.B.
11 Voltage & Waveform Chart
11.1. CD Servo P.C.B.
11.2. Main P.C.B. (1/3)
11.3. Main P.C.B. (2/3)
11.4. Main P.C.B. (3/3)
11.5. Panel P.C.B.
11.6. D-Amp P.C.B.
11.7. Jupiter P.C.B. (1/2)
11.8. Jupiter P.C.B. (2/2)
11.9. Mic P.C.B.
11.10. SMPS P.C.B.
11.11. Waveform Table (1/3)
11.12. Waveform Table (2/3)
11.13. Waveform Table (3/3)
12 Illustration of ICs, Transistor and Diode
13 Block Diagram
13.1. CD Servo Block Diagram
13.2. Jupiter Block Diagram
13.3. Main(1/2) Block Diagram
13.4. Main(2/2) Block Diagram
13.5. Panel / MPort/Headphone / Mic / Memory
Block Diagram
13.6. D-Amp Block Diagram
13.7. SMPS / AC Inlet Diagram
14 Wiring Connection Diagram
15 Schematic Diagram Notes
16 Schematic Diagram
16.1. CD Servo Circuit
16.2. Main Circuit (1/6)
16.3. Main Circuit (2/6)
16.4. Main Circuit (3/6)
16.5. Main Circuit (4/6)
16.6. Main Circuit (5/6)
16.7. Main Circuit (6/6)
16.8. Panel Circuit (1/2)
16.9. Panel Circuit (2/2)
16.10. Memory / MPort/Headphone / Mic Circuit
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16.11. D-Amp Circuit (1/2)
16.12. D-Amp Circuit (2/2)
16.13. Jupiter Circuit (1/4)
16.14. Jupiter Circuit (2/4)
16.15. Jupiter Circuit (3/4)
16.16. Jupiter Circuit (4/4)
16.17. SMPS Circuit (1/2)
16.18. SMPS Circuit (2/2
16.19. AC Inlet Circuit
17 Printed Circuit Board
17.1. CD Servo / Jupiter P.C.B.
17.2. Main P.C.B.
17.3. Panel / Memory / MPort/Headphone / Mic
P.C.B.
17.4. D-Amp P.C.B.
17.5. SMPS/ AC Inlet P.C.B.
18 Terminal Function of ICs
18.1. IC2801 (MN101EF16KXW): IC
Microprocessor
18.2. IC6601(C0HBB0000057): IC FL Driver
19 Exploded View and Replacement Parts List
19.1. Exploded View and Mechanical Replacement
Parts List
19.2. Electrical Replacement Part List
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4
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 1MΩand 5.2MΩ.
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 1.5kΩ, 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. 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 Use (For PH only)
Be sure to disconnect the mains cord before adjusting the voltage selector.
Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will be
used. (If the power supply in your area is 110V ~ 127V or 220V ~ 240V, set to the “110V ~ 127V or 220V ~ 240V” position.)
Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries,
the correct voltage is already set.)
1.3. Caution For Fuse Replacement
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1.4. Before Repair and Adjustment
Disconnect AC power to discharge unit AC Capacitors as such (C5700, C5701, C5703, C5704, C5705, C5706, C5707) 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 110V~127V / 220V~240V, 50/60 Hz in NO SIGNAL mode volume minimal should be ~ 500 mA (For PH
only).
Current consumption at AC 120V, 60 Hz in NO SIGNAL mode volume minimal should be ~ 500 mA (For PN only).
1.5. 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.
1.6. 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 & 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-AK785LM-
K
Safety
INSTRUCTIVO RQTM0171
RKMX0144Z-KL
RD-DAC060-PX
CAPACITOR DE AC F1BAF1020020
K2AA2B000017
ETS48AB12GAC
CAPACITOR DE AC
CAPACITOR DE AC
F0CAF334A087
PCB SMPS
F0CAF224A085
B3PBA0000402
RJBX0562T-1
GAB. MET. SIN DOBLAR
K5G4013A0001
REAR PANEL
Numero de Parte
TRANSFORMADOR DE PODER
TRANSFORMADOR DE
RESPALDO
OPTOACOPLADOR
LECTOR
Ó
PTICO
(CD UNIT)
RESISTENCIA FUSIBLE
FUSIBLE PRIMARIO
BOBINA PRIMARIO ELF22V035B
SMPS FX785 N0AE6GY00001
Nombre del componente
SJA168-1A
ETS19AB256AG
K5D802APA008
CABLE TOMACORRIENTE.
CONECTOR TOMACORRIENTE
RGRX0070R-AL
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