(This “Safety Precaution” is applied only in U.S.A.)
1. Before servicing, unplug the power cord to prevent an
electric shock.
2. Whenreplacingparts,useonlymanufacturer’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 returning the serviced equipment 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. Insulation Resistance Test
1. Unplug the power cord and short the two prongs of the plug with a jumper wire.
2. Turn on the power switch.
3. Measure the resistance value with ohmmeter between the jumper AC plug and each exposed metal cabinet part, such as
screwheads, antenna, control shafts, handle brackets, etc.Measure the resistance value with ohmmeter between the jumper AC
plug and each exposed metal cabinet part, such as screwheads, antenna, control shafts, handle brackets, etc.
Equipment with antenna terminals should read between 2.7MΩ and 3.9MΩ to all exposed parts*. (Fig.1)
Equipment without antenna terminals should read approximatel y infinity to all exposed parts. (Fig.2)
*Note : Some exposed parts may be isolated from the chassis by design. These will read infinity.
4. If the measuremen t is outside the specified limits, there is a possibility of a shock hazard. The equipment should be repaired
and re-checked before it is returned to the customer.
Fig.1
Fig.2
4
SA-AK63 0P / SA-AK63 0PC
1.1.1. Caution for fuse replacement
2 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C5820 and C5840 through a 10Ω, 5W resistor to ground.
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 NO SIGNAL mode (volume min at CD mode) should be ~600mA.
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.
4 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called
Electrostatica lly 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 electro static discharge (ESD).
1. Immediately before handling any semiconduct or component or semiconduct or-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
aluminium foil, to prevent electrostatic charge build up 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 remover device. Some solder removal devices not classified as “anti- static (ESD protected)” can
generate electrical charge to damage ES devices.
5. Do not use freon-propell ed 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, aluminium foil or
comparable conductive material).
5
SA-AK63 0P / SA-AK63 0PC
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 body 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) sufficient to
damage an ES device).
5 Handling the Lead-free Solder
5.1. About lead free solder (PbF)
Distinction of PbF P.C.B.:
P.C.B.s (manufacture d) using lead free solder will have a PbF stamp on the P.C.B.
Caution:
· Pb free solder has a higher melting point than standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher. Please
use a high temperature soldering iron. In case of soldering iron with temperature control, please set it to 700 ± 20°F (370 ±
10°C).
·Pb free solder will tend to splash when heated too high (about 1100°F/600°C).
·W hen soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the
soldering points with the Pb free solder until it melts enough.
6
SA-AK63 0P / SA-AK63 0PC
6 Handling Precautions For Traverse Deck
The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by static electricity of
clothes or human body.
So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).
·Handling of traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock.
2. To prevent the breakdown of the laser diode, an antistatic shorting pin is inserted into the flexible board (FFC board).
3. Take care not to apply excessive stress to the flexible board (FFC board). When removing or connecting the short pin, finish
the job in as short time as possible.
4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted.
Grounding for electrostatic breakdown prevention
1. Human body grounding
Use the anti-static wrist strap to discharge the static electricity from your body.
2. Work table grounding
Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is place, and ground the
sheet.
Caution :
The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the
traverse deck (optical pickup).
Caution when replacing the Traverse Deck
The traverse deck has a short point shorted with solder to protect the laser diode against electrostatics breakdown. Be sure to
remove the solder from the short point before making connections.
7
SA-AK63 0P / SA-AK63 0PC
7 Precaution of Laser Diode
CAUTION:
This unit utilizes a class 1 laser.
Invisible laser radiation is emitted from the optical pickup lens.
Wavelength: 780nm
When the unit is turned on:
1. Do not look directly into the pick up lens.
2. Do not use optical instruments to look at the pick up lens.
3. Do not adjust the preset variable resistor on the pickup lens.
4. Do not disassemble the optical pick up unit.
5. If the optical pick up is replaced, use the manufacturer’s specified replacement pick up only.
6. Use of control or adjustments or performance of procedures other than those specified herein may result in hazardous radiation
exposure.
CAUTION!
THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.
n Use of caution label (Except for U.S.A.)
8
8 Accessories
SA-AK63 0P / SA-AK63 0PC
Remote Control
FM Antenna
AC Cord
AM Loop Antenna
9
SA-AK63 0P / SA-AK63 0PC
9 Operation Procedures
10
SA-AK63 0P / SA-AK63 0PC
11
SA-AK63 0P / SA-AK63 0PC
10 Disassembly and Assembly of Main Component
“ATTENTION SERVICER”
Some chassis components may have sharp edges. Be careful when disassemblin g and servicing.
1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the main
components.
2. For reassembly after operation checks or replacement, reverse the respective procedures.
Special reassembly procedures are described only when required.
3. Select items from the following index when checks or replacement are required.
4. Refer to the Parts No. on the page of “Parts Location and Replacemen t Parts List” (Section 23), if necessary.
10.1. Disassembly flow chart
The following chart is the procedure for disassemblin g the casing and inside parts for internal inspection when carrying out the
servicing.
To assemble the unit, reverse the steps shown in the chart as below.
12
SA-AK63 0P / SA-AK63 0PC
10.2. Gear for servicing (jig) Information
1. This unit has a gear which is used for checking items (Open/Close of disc tray, up/down operation of traverse unit by manually)
when servicing.
2. For preparation of gear (for servicing), perform the procedures as follows.
3. In case of re-servicing the same set, the “gear for servicing” may has been taken off because it has been used. The “gear for
servicing” must be stored.
·Remove the gear provided with mecha cover as shown below.
·Insert the hexagonal screwdriver (2mm) into the gear, and then project the tip of screwdriver for 1~ 2 mm in length.
13
SA-AK63 0P / SA-AK63 0PC
10.3. Disassembly of Top Cabinet
Step 1 Remove 2 screws at each side and 5 screws at rear
panel.
Step 2 Lift up both sides of the top cabinet, push the top
cabinet towards the rear and remove the top cabinet.
10.4. Disassembly of CD Lid
(The CD changer unit can be removed after the CD Lid is removed)
·Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet
·Opening the disc tray automatically (Using Power
Supply)
Step 1 Connect the AC power cord.
Step 2 Press the POWER button to power up the main unit.
Step 4 Release the 2 claws, and then remove the CD Lid.
Step 5 Press the OPEN/CLOSE button, the disc tray will close.
Step 3 Press the OPEN/CLOSE button, the disc tray will open
automatically .
14
Step 6 Press the POWER button to turn the power off.
· [Opening the disc tray manually (Using service tools)]
SA-AK63 0P / SA-AK63 0PC
Step 2 Release the 2 claws, and then remove the CD lid cover.
Step 1 Insert the gear tool into the hole on the underside of CD
chassis and then rotate in the direction of arrow. The disc tray
will be opened.
Step 3 Repeat Step 2 but rotate the gear tools in anti- clockwise
direction.
Step 4 The disc tray will be closed.
15
SA-AK63 0P / SA-AK63 0PC
10.5. Disassembly of Rear Panel
·Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet
Step 1 Remove 7 screws and disconnect wire CN2810 (Fan) at
rear cabinet as shown.
10.6. Disassembly of CD Mechanism Unit
·Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet
Step 1 Remove one screw at rear panel.
Step 2 Detach the FFC wires (CN2801 & CN2805).
Step 4 Remove 4 screws.
Step 5 Remove the CD chassis.
Step 6 Lay the CD mechanism unit as shown.
· For disassembly of CD mechanism unit, please refer to
Section 10.12 of this manual.
Step 3 Release the claws of both ends, and then lift up the CD
Mechanism Unit.
16
10.7. Disassembly of Main P.C.B.
·Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet
·Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid
·Follow the (Step 1) of Item 10.5 - Disassembly of Rear Panel
·Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit
Step 1 Disconnect FFC wires CN2803 & CN2806 from Main
P.C.B.
Step 2 Lift up Main P.C.B. by disconnecting connectors
CN5800 & CN5801 as arrow shown above.
SA-AK63 0P / SA-AK63 0PC
10.8. Disassembly of Sub-Power P.C.B.
·Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet
·Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid
·Follow the (Step 1) of Item 10.5 - Disassembly of Rear Panel
·Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit
·Follow the (Step 1) - (Step 2) of Item 10.7 - Disassembly of Main P.C.B.
Step 1 Remove the 2 screws fixed at Sub Power P.C.B..
Step 2 Remove 2 screws at Power Amplifier IC.
Step 3 Disconnect connector CN5803
Step 4 Lift up the Sub Power P.C.B. to remove it.
17
SA-AK63 0P / SA-AK63 0PC
· Replacement of Power Amplifier IC
Step 1 Desolder the terminals of Power Amplifier IC and
replace the component.
10.9. Disassembly of Power P.C.B.
·Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet
·Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid
·Follow the (Step 1) of Item 10.5 - Disassembly of Rear Panel
·Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit
·Follow the (Step 1) - (Step 2) of Item 10.7 - Disassembly of Main P.C.B.
Step 1 Remove the 2 screws fixed at heat sink.
Step 2 Remove1 screw fixed at Power P.C.B..
Note:
Insulate the Power P.C.B. with insulation material to avoid short
circuit.
18
· Replacement of the Power Amplifier IC/ Voltage Regulator
Step 1 Remove 2 screws fixed to the Power Amplifier IC and 1
screw to Voltage Regulator.
Step 2 Break the joint with a metal cutter as shown below.
SA-AK63 0P / SA-AK63 0PC
Step 3 Unsolder the terminals of Power Amp IC, transistor and
replace the components.
Step 4 Fix back the cut portion with a screw as shown.
19
SA-AK63 0P / SA-AK63 0PC
10.10. Disassembly of Transformer P.C.B.
·Follow the (Step 1) - (Step 2) of Item 10.3 - Disassembly of Top Cabinet
·Follow the (Step 1) - (Step 6) of Item 10.4 - Disassembly of CD Lid
·Follow the (Step 1) of Item 10.5 - Disassembly of Rear Panel
·Follow the (Step 1) - (Step 3) of Item 10.6 - Disassembly of CD Mechanism Unit