Panasonic SA-AKX76PH User manual

© Panasonic Corporation 2013. All rights reserved.
Unauthorized copying and distribution is a violation
of law.
PSG1303033CE
CD Stereo System
Model No. SA-AKX76PH
SA-AKX76PN
Product Color: (K)...Black Type
TABLE OF CONTENTS PAGE PAGE
1 Safety Precautions----------------------------------------------- 3
1.1. General Guidelines---------------------------------------- 3
1.2. Before Use (For PH only)-------------------------------- 4
1.3. Before Repair and Adjustment------------------------- 4
1.4. Protection Circuitry---------------------------------------- 4
1.5. Caution For Fuse Replacement------------------------ 4
1.6. Safety Parts Information--------------------------------- 5
2 Warning-------------------------------------------------------------- 6
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatically Sensitive (ES) Devices---------- 6
2.2. Precaution of Laser Diode------------------------------- 7
2.3. Service caution based on Legal restrictions-------- 8
2.4. Handling Precautions for Traverse Unit-------------- 9
2.5. Grounding for electrostatic breakdown
prevention --------------------------------------------------10
3 Service Navigation----------------------------------------------11
3.1. Service Information-------------------------------------- 11
4 Specifications----------------------------------------------------13
5 General/Introduction-------------------------------------------14
5.1. Media Information---------------------------------------- 14
6 Location of Controls and Components------------------15
6.1. Remote Control Key Button Operation -------------15
6.2. Main Unit Key Button Operation----------------------16
7 Installation Instructions --------------------------------------17
7.1. Speaker and A/C Connection-------------------------17
8 Service Mode-----------------------------------------------------18
8.1. Cold-Start -------------------------------------------------- 18
8.2. Doctor Mode Table--------------------------------------- 19
8.3. Reliability Test Mode (CD Mechanism Unit)------- 22
8.4. Self-Diagnostic Mode -----------------------------------23
8.5. Self-Diagnostic Error Code Table-------------------- 23
8.6. Sales Demonstration Lock Function ----------------24
Please refer to the original service manual for:
O
OO
OCD Mechanism Unit , Order No. PSG1102001CE
O
OO
OSpeaker system SB-AKX76PN-K, Order No. PSG1303034CE

2
9 Troubleshooting Guide----------------------------------------25
10 Disassembly and Assembly Instructions---------------26
10.1. Screw Types-----------------------------------------------26
10.2. Disassembly Flow Chart--------------------------------27
10.3. Main Components and P.C.B. Locations ----------28
10.4. Disassembly of Top Cabinet---------------------------29
10.5. Disassembly of Front Panel Unit---------------------30
10.6. Disassembly of Panel P.C.B., LED P.C.B. and
Music Port P.C.B.-----------------------------------------31
10.7. Disassembly of Remote Sensor P.C.B.-------------33
10.8. Disassembly of USB P.C.B. ---------------------------33
10.9. Disassembly of CD Lid----------------------------------34
10.10. Disassembly of Rear Panel----------------------------34
10.11. Disassembly of Main P.C.B.---------------------------35
10.12. Disassembly of SMPS P.C.B. and Voltage
Selector P.C.B.--------------------------------------------37
10.13. Disassembly of CD Mechanism Unit----------------37
10.14. Disassembly of CD Interface P.C.B.-----------------39
10.15. Disassembly of Fan Unit -------------------------------39
11 Service Position-------------------------------------------------40
11.1. Checking of Panel P.C.B. ------------------------------40
11.2. Checking of Main P.C.B. (Side A)--------------------40
11.3. Checking of Main P.C.B. (Side B)--------------------40
11.4. Checking of SMPS P.C.B.------------------------------41
12 Block Diagram ---------------------------------------------------43
12.1. Servo & System Control--------------------------------43
12.2. Audio --------------------------------------------------------45
12.3. Power Supply ---------------------------------------------47
13 Wiring Connection Diagram---------------------------------49
14 Schematic Diagram---------------------------------------------51
14.1. Schematic Diagram Notes-----------------------------51
14.2. MAIN (CD Servo/Micon/Damp) Circuit -------------53
14.3. Panel Circuit-----------------------------------------------67
14.4. USB, Music Port, Memory LED & Remote
Sensor Circuit---------------------------------------------69
14.5. SMPS Circuit----------------------------------------------70
14.6. Voltage Selector & CD Interface Circuit ------------72
15 Printed Circuit Board ------------------------------------------73
15.1. Main P.C.B. ------------------------------------------------73
15.2. Panel, USB, Music Port & Memory LED
P.C.B.--------------------------------------------------------75
15.3. SMPS & Voltage Selector P.C.B.---------------------76
15.4. Remote Sensor & CD Interface P.C.B. -------------77
16 Appendix Information of Schematic Diagram---------79
16.1. Voltage & Waveform Chart ----------------------------79
17 Exploded View and Replacement Parts List-----------87
17.1. Exploded View and Mechanical replacement
Part List-----------------------------------------------------87
17.2. Electrical Replacement Part List ---------------------93

3
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 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 1-1.
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

4
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 unit AC Capacitors as such (C5700, C5701, C5703, C5704 (PN), C5705 (PN), C5706, C5707,
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 110~127 V / 220~240 V, 50/60 Hz in FM Tuner at volume minimum should be ~ 750 mA (PH).
Current consumption at AC 120 V, 60 Hz in FM Tuner at volume minimum should be ~ 500 mA (PN).
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.
Safety Ref No. Part No. Part Name & Description Remarks
16 RGR0443E-A1 REAR PANEL PN
16 RGR0443F-A1 REAR PANEL PH
17 RKM0713-K TOP CABINET
301 RAE1036Z-V TRAVERSE ASS'Y
A2 K2CB2CB00022 AC CORD PN
A2 K2CQ2YY00119 AC CORD PH
A3 RQT9798-M O/I BOOK (Sp/En)
PCB8 REP4965F SMPS P.C.B. (RTL)
PH
PCB10 REP4965D SMPS P.C.B. (RTL)
PN
DZ5701 D4EAY511A127 VARISTOR (E.S.D)
S5701 K0ABCA000007 AC VOLTAGE SELECTOR PH
L5702 G0B932H00003 LINE FILTER
T5701 G4DYZ0000070 TRANSFORMER
T5751 G4DYZ0000064 TRANSFORMER
F1 K5D802APA008 FUSE PN
F1 K5D802BK0004 FUSE PH
PC5701 B3PBA0000579 PHOTO COUPLER
PC5702 B3PBA0000579 PHOTO COUPLER
PC5720 B3PBA0000579 PHOTO COUPLER
PC5799 B3PBA0000579 PHOTO COUPLER
P5701 K2AA2B000011 AC INLET PH
P5701 K2AB2B000007 AC INLET PN
R5708 D0GF155JA048 1.5M 1/4W
R5709 D0GF155JA048 1.5M 1/4W
C5700 F1BAF1020020 1000pF PH
C5700 F1BAF471A013 470pF PN
C5701 F0CAF104A105 0.1uF
C5703 F0CAF224A105 0.22uF
C5704 F1BAF471A013 470pF PN
C5705 F1BAF471A013 470pF PN
C5706 F1BAF471A013 470pF
C5707 F1BAF471A013 470pF
C5708 F1BAF1020020 1000pF PH
C5708 F1BAF471A013 470pF PN

6
2Warning
2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatically Sensi-
tive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Elec-
trostatically Sensitive (ES) Devices.
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 µW/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.
Figure 2-1

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 (86°F) 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±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%
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.
Figure 2-2

10
2.5. Grounding for electrostatic breakdown prevention
• As for parts that use optical pick-up (laser diode), the optical pick-up is destroyed by the static electricity of the working environ-
ment.
Repair in the working environment that is grounded.
2.5.1. Worktable grounding
• Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed and ground the sheet.
2.5.2. Human body grounding
• Use the anti-static wrist strap to discharge the static electricity form your body Figure 2-3
Figure 2-3

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.
•Micro-processor:
1) The following components are supplied as an assembled part.
- Micro-processor IC, IC2006 (RFKWMAKX56LM)

12
3.1.1. Firmware Update Procedure
Start
Write encrypted UPD bin to CD-R
Turn On main set
Insert CD-R (with UPD bin) and
c ose
TOC reading
Writing starts:
"0%" -> "20%" -> "40%" ->
"60%" -> "80%" -> 100%"
"CHECKING"
"GOOD" disp ay 3 sec
Set auto turn Off -> Co d Start
End
OK
NG "NO PLAY"
process end

13
4 Specifications
QAmplifier section
RMS output power stereo mode
Front Hi (both ch driven)
250 W per channel (3Ω), 1 kHz, 30% THD
Front Lo (both ch driven)
250 W per channel (3Ω), 100 Hz, 30% THD
Subwoofer ch 400 W per channel (2Ω), 100 Hz, 30% THD
Total RMS stereo mode power 1400 W (30% THD)
Q
QQ
QTuner, terminals section
Preset memory FM 30 stations
AM 15 stations
Frequency modulation (FM)
Frequency range 87.50 to 108.00 MHz
(50 kHz step) (for PH)
87.5 to 108.0 MHz
(100 kHz step) (for PN)
87.9 to 107.9 MHz
(200 kHz step) (for PN)
Antenna terminals 75 Ω(unbalanced)
Amplitude modulation (AM)
Frequency range 522 kHz to 1629 kHz
(9 kHz step) (for PH)
520 kHz to 1630 kHz
(10 kHz step) (for PH)
520 kHz to 1710 kHz
(10 kHz step) (for PN)
Music port (front)
Sensitivity 100 mV, 4.7 kΩ
Terminal Stereo, 3.5 mm jack
Aux Input RCA pin jack
Q
QQ
QDisc section
Discs played (8 cm or 12 cm) CD, CD-R/RW(CD-DA, MP3*)
Pick up
Wavelength 790 nm(CD)
Audio output
Number of channels 2.1 ch (FL, FR, SW)
FL = Front left channel
FR = Front right channel
SW = Subwoofer channel
*MPEG-1 Layer 3
Q
QQ
QInternal memory section
Memory
Memory size 2 GB
Media file format support MP3 (*.mp3)
Memory recording
Bit rate 128 kbps
Memory recording speed 1x, 3x max (CD only)
Recording file format MP3 (*.mp3)
Capacity of total songs recorded 510 songs
(use 128 kbps, approximately 1 song = 4 mins)
Q
QQ
QUSB section
USB port
USB standard USB 2.0 full speed
Media file format support MP3 (*.mp3)
USB device file system FAT12, FAT16, FAT32
USB port power 500 mA (max)
Bit rate 16 kbps to 320 kbps (playback)
USB recording
Bit rate 128 kbps
USB recording speed 1x, 3x max (CD only)
Recording file format MP3 (*.mp3)
QGeneral
Power supply AC 110 to 127/220 to 240 V,
50/60 Hz (for PH)
AC 120 V, 60 Hz (for PN)
Power consumption 125 W (PH)
120 W (PN)
Dimensions (W x H x D) 220 mm x 334 mm x 250 mm
Mass 3.4 kg
Operating temperature range 0 °C to +40 °C
Operating humidity range 35% to 80% RH
(no condensation)
PowerConsumptioninstandby
mode 0.3 W (approximate)(PH) 0.2 W (approximate)(PN)
Note:
1. Specifications are subject to change without notice.
Mass and dimension are appropriate
2. Total harmonic distortion is measured by the digital spectrum
analyzer.
QSystem: SC-AKX76PH-K Main Unit: SA-AKX76PH-K
Speakers System: SB-AKX76PN-K
QSystem: SC-AKX76PN-K Main Unit: SA-AKX76PN-K
Speakers System: SB-AKX76PN-K

14
5 General/Introduction
5.1. Media Information

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

16
6.2. Main Unit Key Button Operation

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

18
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

19
8.2. Doctor Mode Table
8.2.1. Doctor Mode Table 1
FL Disp ay
Key Operation
Front Key
Item
DescriptionMode Name
Doctor Mode
EEPROM
checksum
check
To enter into Doctor Mode In CD Mode:
1. Press [ ] button on
main unit fo ow by [4]
and [7] on remote contro .
In CD mode:
1. Enter into Doctor Mode
2. To exit, press [DELETE]
button on remote contro or,
press [POWER, /I] button on
Main Unit
Disp aying of
1. Year Deve op.
2. Mode Type.
3. ROM Type.
4. Firmware Version.
(Disp ay 1)
Version No. (001 ~ 999) specific for each
firmware
(Decima )1 2 3 4
(Disp ay 2)
Checksum (Hex)

20
8.2.2. Doctor Mode Table 2
FL Disp ay
Key Operation
Front Key
Item
DescriptionMode Name
Vo ume Setting
Check
FL Disp ay Check
To check the vo ume setting of the
main unit.
To check the FL segment disp ay.
A segments wi ight up whi e a LED
b ink at 0.5s interva s.
In Doctor Mode:
1. Press [7], [8], [9] button on
the remote contro .
In Doctor mode:
1. Press [1] button on the
remote contro .
2. To cance this mode, press
[0] button on the remote contro .
Press [7]: VOL50
Press [8]: VOL35
Press [9]: VOL0
Vo ume
In this mode, the tray wi open & c ose
automatica y.
Cance ation Disp ay
Loading Test To determine the open & c ose
operation of the CD Mechanism Unit.
Note: Refer to Section 8.3 Figure 8-2
for process f ow
Note: Refer to Section 8.3 Figure 8-3
for process f ow
Note: Refer to Section 8.3 Figure 8-1
for process f ow
.
The counter wi
increment by one.
When reach 99999999
wi change to 00000000
Cance ation Disp ay
Traverse Test To determine the traverse unit
operation for inner & outer access track.
The counter wi
increment by one.
When reach 99999999
wi change to 00000000
The counter wi
increment by one.
When reach 99999999
wi change to 00000000
Cance ation Disp ay
Re iabi ity Test
(Combination)
In this mode,ensure the CD is in the
main unit.
To determine the traverse unit
operation & open/c ose operation of the
mechanism.
In this mode,ensure the CD is in the
main unit.
In Doctor Mode:
1. Press [10] [2] [1] button
on the remote contro .
In Doctor Mode:
2. To cance this mode, press
[0] button on the remote contro .
1. Press [10] [1] [2] button
on the remote contro .
In Doctor Mode:
1. Press [10] [1] [5] button
on the remote contro .
2. To cance this mode, press
[0] button on the remote contro .
2. To cance this mode, press
[0] button on the remote contro .