Service Manuals, User Guides, Schematic Diagrams or docs for : panasonic Audio SC-AKX58 hfe_panasonic_sa-akx58_akx78_service_en
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PSG1403011CE
CD Stereo System
Model No. SA-AKX58PH
SA-AKX58PN
SA-AKX58GN
SA-AKX78PH
SA-AKX78PN
Product Color: (K)...Black Type
Please refer to the original service manual for:
CD Mechanism Unit, Order No. PSG1303059AE
Speaker system SB-AKX78PN-K, Order No. PSG1403012CE
Speaker system SB-AKW78PN-K, Order No. PSG1403012CE (For AKX78)
TABLE OF CONTENTS
PAGE PAGE
1 Safety Precautions----------------------------------------------- 3 2.5. Grounding for electrostatic breakdown
1.1. General Guidelines---------------------------------------- 3 prevention-------------------------------------------------- 10
1.2. Before Use (For PH only)-------------------------------- 4 3 Service Navigation --------------------------------------------- 11
1.3. Before Repair and Adjustment ------------------------- 4 3.1. Service Information -------------------------------------- 11
1.4. Protection Circuitry ---------------------------------------- 5 4 Specifications ---------------------------------------------------- 12
1.5. Power Supply using SMPS ----------------------------- 5 5 Location of Controls and Components------------------ 13
1.6. Safety Parts Information --------------------------------- 7 5.1. Remote Control Key Button Operation ------------- 13
2 Warning -------------------------------------------------------------- 8 5.2. Main Unit Key Button Operation---------------------- 14
2.1. Prevention of Electrostatic Discharge (ESD) 6 Service Mode ----------------------------------------------------- 15
to Electrostatically Sensitive (ES) Devices---------- 8 6.1. Cold-Start -------------------------------------------------- 15
2.2. Precaution of Laser Diode------------------------------- 8 6.2. Sales Demonstration Lock Function ---------------- 15
2.3. General description about Lead Free Solder 6.3. Service Mode Table ------------------------------------- 16
(PbF)---------------------------------------------------------- 9 6.4. Doctor Mode Table--------------------------------------- 17
2.4. Handling Precautions for Traverse Unit-------------- 9 6.5. Self-Diagnostic Mode ----------------------------------- 20
6.6. Self-Diagnostic Error Code Table -------------------- 20
7 Troubleshooting Guide---------------------------------------- 22
8 Disassembly and Assembly Instructions --------------- 23
8.1. Type of Screws ------------------------------------------- 23
8.2. Disassembly Flow Chart-------------------------------- 23
8.3. Main Components and P.C.B. Locations ----------- 24
8.4. Disassembly of Top Cabinet--------------------------- 25
8.5. Disassembly of Front Panel Unit ----------------- 25
8.6. Disassembly of Panel P.C.B. and Music Port
P.C.B.-------------------------------------------------------- 26
8.7. Disassembly of Bluetooth P.C.B. --------------------- 27
8.8. Disassembly of USB P.C.B. --------------------------- 27
8.9. Disassembly of Rear Panel. --------------------------- 28
8.10. Disassembly of Main P.C.B. --------------------------- 29
8.11. Disassembly of SMPS P.C.B. and Voltage
Selector P.C.B.-------------------------------------------- 30
8.12. Disassembly of CD Mechanism Unit ----------- 31
8.13. Disassembly of CD Interface P.C.B.----------------- 32
9 Service Position ------------------------------------------------- 33
9.1. Checking of Panel P.C.B. and Main P.C.B. -------- 33
9.2. Checking of SMPS P.C.B. and Voltage
Selector P.C.B.-------------------------------------------- 33
10 Block Diagram --------------------------------------------------- 35
10.1. System Control ------------------------------------------- 35
10.2. Audio -------------------------------------------------------- 38
10.3. Power Supply --------------------------------------------- 40
11 Wiring Connection Diagram --------------------------------- 42
12 Schematic Diagram--------------------------------------------- 43
12.1. Schematic Diagram Notes ----------------------------- 43
12.2. Main (CD Motor Driver) Circuit------------------------ 45
12.3. Main (USB EMMC) Circuit ----------------------------- 46
12.4. Main (SOC I/O Expander) Circuit -------------------- 47
12.5. Main (Damp) Circuit ------------------------------------- 49
12.6. Main (Connector) Circuit ------------------------------- 51
12.7. Main (DSP) Circuit --------------------------------------- 52
12.8. Main (Tuner AUX) Circuit ------------------------------ 53
12.9. Main (VREG Fan) Circuit------------------------------- 54
12.10. Panel Circuit ----------------------------------------------- 57
12.11. USB, Music Port & CD Interface Circuit ------------ 58
13 Printed Circuit Board ------------------------------------------ 59
13.1. Main P.C.B. (Side A)------------------------------------- 59
13.2. Main P.C.B. (Side B)------------------------------------- 60
13.3. Panel, USB & Music Port P.C.B. --------------------- 61
13.4. CD Interface P.C.B. -------------------------------------- 62
14 Voltage and Waveform Measurement -------------------- 63
14.1. Voltage Measurement----------------------------------- 63
14.2. Waveform Chart ------------------------------------------ 68
15 Exploded View and Replacement Parts List ----------- 69
15.1. Cabinet Parts Location 1 ------------------------------- 69
15.2. Cabinet Parts Location 2 ------------------------------- 70
15.3. Packaging (SC-AKX58GN/PH/PN-K) --------------- 71
15.4. Packaging (SC-AKX78PH/PN-K) -------------------- 72
15.5. Mechanical Replacement Part List ------------------ 73
15.6. Electrical Replacement Parts List -------------------- 75
2
1 Safety Precautions
1.1. General Guidelines
1. IMPORTANT SAFETY NOTICE
There are special components used in this equipment which are important for safety. These parts are marked by in the
Schematic Diagrams, Circuit Board Layout, Exploded Views and Replacement Parts List. It is essential that these critical parts
should be replaced with manufacturer's specified parts to prevent X-RADIATION, shock, fire, or other hazards. Do not modify
the original design without permission of manufacturer.
2. An Isolation Transformer should always be used during the servicing of AC Adaptor whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal
injury from electrical shocks. It will also protect AC Adaptor from being damaged by accidental shorting that may occur during
servicing.
3. 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.
4. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
5. After servicing, make 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 0.15F capacitors, between each exposed metallic part on the set and a
good earth ground such as a water pipe, as shown in Figure 1-1.
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
3
1.2. Before Use (For PH only)
Be sure to disconnect the mains cord before adjusting the voltage selector as shown in Figure 1-2.
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.
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.)
Figure 1-2
1.3. Before Repair and Adjustment
Disconnect AC power to discharge AC capacitor as indicate below diagram through a 10 , 10 W resistor to ground.
Figure 1-3
Caution:
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
4
After repairs are completed, restore power gradually using a variac to avoid overcurrent.
Current consumption at AC 110~127 V / 220~240 V, 50/60 Hz during Power ON, in FM mode at volume minimal should be ~ 750
mA (PH).
Current consumption at AC 120 V, 60 Hz during Power ON, in FM mode at volume minimal should be ~ 750 mA (PN).
Current consumption at AC 220~240 V, 50 Hz during Power ON, in FM mode at volume minimal should be ~ 750 mA (GN).
1.4. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
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