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MX-K50
1-2
1. This design of this product contains special hardware and many circuits and components specially for safety
purposes. For continued protection, no changes should be made to the original design unless authorized in
writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services
should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product
should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further
relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily
be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in the Parts List of Service Manual. Electrical
components having such features are identified by shading on the schematics and by ( ) on the Parts List in
the Service Manual. The use of a substitute replacement which does not have the same safety characteristics
as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or
other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be
separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of
electric shock and fire hazard. When service is required, the original lead routing and dress should be
observed, and it should be confirmed that they have been returned to normal, after re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the product
(antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the
product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage
current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return
path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor
between an exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal part,
particularly any exposed metal part having a return path to
the chassis, and meausre the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and repeat each
measurement. Voltage measured any must not exceed 0.75 V
AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
Good earth groundPlace this
probe on
each exposed
metal part. AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W 0.15 F AC TYPE
!
Burrs formed during molding may
be left over on some parts of the
chassis. Therefore, pay attention to
such burrs in the case of
preforming repair of this system.
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " "
mark nearby are critical for safety.
(This regulation does not correspond to J and C version.)
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MX-K50
Preventing static electricity
1. Grounding to prevent damage by static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,
can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
2. About the earth processing for the destruction prevention by static electricity
In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of
the work environment.
Be careful to use proper grounding in the area where repairs are being performed.
2-1 Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over
it before placing the traverse unit (optical pickup) on it.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
3. Handling the optical pickup
1. In order to maintain quality during transport and before installation, both sides of the laser diode on the
replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power
source can easily destroy the laser diode.
4. Handling the traverse unit (optical pickup)
1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific
details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse
unit. Be careful not to take too long a time when attaching it to the connector.
3. Handle the flexible cable carefully as it may break when subjected to strong force.
4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Attention when CD mechanism assembly is decomposed
1. Remove the CD changer unit.
2. Remove the CD changer mechanism.
3. Solder is put up before the card wire is removed from the pickup unit
connector on the CD mechanism assembly.
(When the card wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
4. Please remove solder after connecting the card wire with the pickup unit
connector when you install picking up in the substrate.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the CD mechanism assembly.
SolderingFig.1
Fig.2
Card wire Card wire
Picup unit
connector
Picup unit
connector CD changer unit
CD changer
mechanism
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MX-K50
3-11
Item
Parts number Parts name Ar ea
Electrical parts list (Front board)
Remarks
Block No. 02
A
MCW1 AH39-00246ALEAD CONNECTOR 1007
MCW2 AH39-00248ALEAD CONNECTOR 1007
MC1 2401-001975 E.CAPACITOR 47UF 20% 16V MC102401-001954 E.CAPACITOR 4.7UF 20% 50V
MC112201-000300 C.CAPACITOR 1NF 20% 50V
MC122401-001912 E.CAPACITOR 1UF 20% 50V MC2 2201-000504 C.CAPACITOR 0.039NF 5% 50V
MC3 2401-001954 E.CAPACITOR 4.7UF 20% 50V
MC4 2401-001954 E.CAPACITOR 4.7UF 20% 50V MC5 2401-001954 E.CAPACITOR 4.7UF 20% 50V
MC6 2401-001975 E.CAPACITOR 47UF 20% 16V
MC7 2401-001954 E.CAPACITOR 4.7UF 20% 50V
MC8 2401-001912 E.CAPACITOR 1UF 20% 50V
MC9 2201-000653 C.CAPACITOR 0.068NF 5% 50V
MD1 0401-000101DIODE 1N4148 100V
MD2 0401-000101DIODE 1N4148 100V
MIC 3722-000351MIC JACK 11P 3.5PI AG
MIC1 1201-000163 IC BA4560 SOP 8P
MQ1 0501-000398TRANSISTOR KSC945
MQ2 0501-000398TRANSISTOR KSC945
MR1 2001-000356CARBON RESISTOR 150K 5% 1/8W
MR102001-000472CARBON RESISTOR 2.7K 5% 1/8W
MR112001-000522CARBON RESISTOR 22K 5% 1/8W
MR122001-000734CARBON RESISTOR 4.7K 5% 1/8W MR132001-000734CARBON RESISTOR 4.7K 5% 1/8W
MR142001-000734CARBON RESISTOR 4.7K 5% 1/8W
MR152001-000660CARBON RESISTOR 33K 5% 1/8W MR162001-000855CARBON RESISTOR 560 5% 1/4W
MR172001-000855CARBON RESISTOR 560 5% 1/4W
MR2 2001-000290CARBON RESISTOR 10K 5% 1/8W MR3 2001-000290CARBON RESISTOR 10K 5% 1/8W
MR4 2001-000449CARBON RESISTOR 2.2K 5% 1/8W
MR5 2001-000472CARBON RESISTOR 2.7K 5% 1/8W MR6 2001-000290CARBON RESISTOR 10K 5% 1/8W
MR7 2001-000429CARBON RESISTOR 1K 5% 1/8W
MR8 2001-000734CARBON RESISTOR 4.7K 5% 1/8W
MR9 2001-000273CARBON RESISTOR 100K 5% 1/8W
MVR1 2101-001052ROTA V RESISTOR 10K 10%
R-EYE AC59-60060AREMOCON EYE GP1U281R
UCW1 3708-000492CONNECTOR 9P 1.25MM
UCW2 3708-001691CONNECTOR 18P 1.25MM
UCW3 3708-000454CONNECTOR 22P 1.25MM
UCW4 3708-000451CONNECTOR 16P 1.25MM
UCW5 3708-000492CONNECTOR 9P 1.25MM
UCW6 3708-001488CONNECTOR 30P 1.25MM
UCW7 3708-001692CONNECTOR 18P 1.25MM
UC1 2401-000475 E.CAPACITOR 10UF 20% 50V
UC10 2401-000240 E.CAPACITOR 100UF 20% 10V UC11 2401-000759 E.CAPACITOR 220NF 20% 50V
UC12 2401-001355 E.CAPACITOR 470UF 20% 10V
UC15 2201-000565 C.CAPASITOR 47NF 50V UC17 2401-001954 E.CAPACITOR 4.7UF 20% 50V
UC19 2201-000565 C.CAPASITOR 47NF 50V
UC2 2201-000565 C.CAPASITOR 47NF 50V UC20 2201-000163 C.CAPASITOR 10NF +80-20% 50V
UC21 2201-000163 C.CAPASITOR 10NF +80-20% 50V
UC3 2401-000475 E.CAPACITOR 10UF 20% 50V
UC30 2202-000781 C.CAPASITOR 100PF 10% 50V
UC32 2401-001364 E.CAPACITOR 470UF 20% 10V
UC4 2201-000565 C.CAPASITOR 47NF 50V
UC5 2201-000565 C.CAPASITOR 47NF 50V
UC6 2201-000423 C.CAPASITOR 0.027NF 5% 50V
UC7 2201-000423 C.CAPASITOR 0.027NF 5% 50V
UC8 2201-000247 C.CAPASITOR 0.015NF 5% 50V
UC9 2201-000247 C.CAPASITOR 0.015NF 5% 50V
UD11 0402-000127DIODE 1N4002 100V 1A UD12 0402-000127DIODE 1N4002 100V 1A
UD13 0402-000127DIODE 1N4002 100V 1A
UD14 0401-000101DIODE 1N4148 100V UD15 0401-000101DIODE 1N4148 100V
UD16 0402-000127DIODE 1N4002 100V 1A
UD17 0402-000127DIODE 1N4002 100V 1A UD18 0402-000127DIODE 1N4002 100V 1A
UD19 0402-000127DIODE 1N4002 100V 1A
UD20 0402-000127DIODE 1N4002 100V 1A
UIC1 AH11-00037C IC MASK ROM LC866P548V-5V95
UIC2 0904-001316 IC M66010GP 32P
ULD1 0601-001238 LED LTL-1CHESS-UA
ULD10 0601-001238 LED LTL-1CHESS-UA
ULD11 0601-001238 LED LTL-1CHESS-UA
ULD12 0601-001238 LED LTL-1CHESS-UA
ULD13 0601-001238 LED LTL-1CHESS-UA
ULD14 0601-001238 LED LTL-1CHESS-UA
ULD15 0601-001238 LED LTL-1CHESS-UA
ULD16 0601-001238 LED LTL-1CHESS-UA
ULD2 0601-001238 LED LTL-1CHESS-UA
ULD3 0601-001238 LED LTL-1CHESS-UA ULD4 0601-001238 LED LTL-1CHESS-UA
ULD5 0601-001238 LED LTL-1CHESS-UA
ULD6 0601-001238 LED LTL-1CHESS-UA ULD7 0601-001238 LED LTL-1CHESS-UA
ULD8 0601-001238 LED LTL-1CHESS-UA
ULD9 0601-001238 LED LTL-1CHESS-UA UQ1 0504-000117DEGI TRANSISTOR KSR1002
UQ10 0501-000610TRANSISTOR KSA928A-Y 1W
UQ11 0501-000610TRANSISTOR KSA928A-Y 1W UQ12 0504-000117DEGI TRANSISTOR KSR1002
UQ13 0504-000117DEGI TRANSISTOR KSR1002
UQ14 0504-000117DEGI TRANSISTOR KSR1002
UQ15 0504-000117DEGI TRANSISTOR KSR1002
UQ17 0504-000118DEGI TRANSISTOR KSR1003
UQ18 0501-000398TRANSISTOR KSC945
UQ2 0504-000117DEGI TRANSISTOR KSR1002
UQ3 0504-000117DEGI TRANSISTOR KSR1002
UQ4 0504-000117DEGI TRANSISTOR KSR1002
UQ5 0504-000118DEGI TRANSISTOR KSR1003
UQ6 0501-000398TRANSISTOR KSC945
UQ7 0504-000118DEGI TRANSISTOR KSR1003
UQ8 0501-000610TRANSISTOR KSA928A-Y 1W
UQ9 0504-000118DEGI TRANSISTOR KSR1003
UR1 2001-000003CARBON RESISTOR 330 5% 1/8W UR10 2001-000258CARBON RESISTOR 1.8K 5% 1/8W
UR11 2001-000449CARBON RESISTOR 2.2K 5% 1/8W
UR110 2001-000995CARBON RESISTOR 820 5% 1/8W UR111 2001-000855CARBON RESISTOR 560 5% 1/4W
UR112 2001-000241CARBON RESISTOR 1.5K 5% 1/8W
UR113 2001-000855CARBON RESISTOR 560 5% 1/4W UR114 2001-000258CARBON RESISTOR 1.8K 5% 1/8W
UR115 2001-000855CARBON RESISTOR 560 5% 1/4W
UR116 2001-000591CARBON RESISTOR 3.3K 5% 1/8W
UR117 2001-000449CARBON RESISTOR 2.2K 5% 1/8W
UR118 2001-000890CARBON RESISTOR 6.8K 5% 1/8W
UR119 2001-000290CARBON RESISTOR 10K 5% 1/8W
UR12 2001-000734CARBON RESISTOR 4.7K 5% 1/8W
UR120 2001-000890CARBON RESISTOR 6.8K 5% 1/8W
UR121 2001-000290CARBON RESISTOR 10K 5% 1/8W
Item
Parts number Parts name Ar ea Remarks A
