ORDER NO. MD0704054CE CD Stereo System SA-AK250PL Colour (S)... Silver Type Notes: This model’s CD mechanism changer unit is CRS1. Please refer to the original Service Manual (Order No. MD0509368C0) for this mechanism. Specifications RMS output power Terminal Stereo, 3.5 mm jack...
SA-AK250PL (3) MP3* Power consumption 100 W *MPEG-1 Layer 3, MPEG-2 Layer 3 Power consumption in standby 0.28 W mode Bit rate Dimensions (W x H x D) 250 x 330 x 323 mm 32 kbps to 320 kbps Mass 7.1 kg...
SA-AK250PL 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, ensure that all the protective devices such as insulation barriers and insulation papers shields are properly installed.
SA-AK250PL 1.3. 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.
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SA-AK250PL 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.
SA-AK250PL 3 Handling Precautions For Traverse Unit The laser diode in the traverse unit (with optical pickup) may break down due to potential difference caused by the static electricity of clothes or our human body. So, be careful of electrostatic breakdown during repair of the traverse unit (with optical pickup).
SA-AK250PL 4 Precaution of laser diode CAUTION: This unit utilizes a class 1 laser diode in the optical pickup unit . 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 optical pickup lens.
SA-AK250PL 5 About Lead Free Solder (PbF) 5.1. Service caution based on legal restrictions 5.1.1. 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.
SA-AK250PL 6 Accessories Note: Refer to “Replacement Parts List” (Section 24) for part number. Remote Control FM Antenna Wire AC Cord AM Loop Antenna...
SA-AK250PL 9 Self diagnosis and special mode setting This unit is equipped with functions for checking and inspecting namely: Self-Diagnostic and Test Mode. 9.1. Service Mode Summary Table The service modes can be activated by pressing various button combination on the main unit and remote control unit. Below is the...
SA-AK250PL Below are the procedures for this mode. Step 1: Enter into Doctor mode (for more information, refer to section 9.2 on the key operation to enter into this mode. Step 2: Check for firmware version and EEPROM checksum (By pressing STOP button on main unit followed by “4” and “7” on remote control).
SA-AK250PL 9.4. Error code Table Display Self-Diagnosis Function (refer Section 9.2) provides information on any problems occuring for the unit and its respective components by displaying the error codes. These error code such as U**, H** and F** are stored in memory and held unless it is cleared.
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SA-AK250PL 9.4.2. Error Code Table For CD Changer Block...
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SA-AK250PL 9.4.3. Error Code Table For Power Supply 9.4.4. CRS1 Error Code display CRS1 Error Code display 1. The errors that occured in CRS1 Mechanism can be recalled and displayed, in the order of the occurence under self-diagnostic for procedures to enter this mode.
SA-AK250PL 10 Assembling and Disassembling 10.1. Caution Special Note: This model uses a new CD changer unit CRS1. In this following section does not contain the necessary disassembly & assembly information for the CD changer unit (CRS1) except the disasembly & assembly of traverse unit. Kindly refer to the original service manual for the CD changer unit.
SA-AK250PL 10.2. Disassembly flow chart The following chart is the procedure for disassembling 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.
SA-AK250PL 10.4. Disassembly of Top Cabinet Step 1 Remove 3 screws on both sides on top cabinet. Step 2 Remove 5 screws at the rear. Step 3 Lift the sides of top cabinet outwards. Step 4 Push the top cabinet backwards to release catches.
SA-AK250PL · Disassembly of Mecha Chassis Step 5 Remove 2 screws. Step 6 Remove the Mecha Chassis. Note: For disassembly & assembly of traverse unit, please refer to section 10.15 of this service manual. Please refer to original Service Manual for the Disassembly and Assembly of the CD Changer Unit (CRS1).
SA-AK250PL 10.7. Disassembly of Main P.C.B. · Follow the (Step 1) - (Step 5) of Item 10.4 · Follow the (Step 1) - (Step 4) of Item 10.5 · Follow the (Step 1) - (Step 4) of Item 10.6 Step 1 Detach FFC cables at connectors (CN2803 & CN2806) on Main P.C.B..
SA-AK250PL 10.9. Disassembly of Power P.C.B. · Follow the (Step 1) - (Step 5) of Item 10.4 · Follow the (Step 1) - (Step 4) of Item 10.5 · Follow the (Step 1) - (Step 4) of Item 10.6 · Follow the (Step 1) - (Step 3) of Item 10.7 Step 1 Flip the Power P.C.B.
SA-AK250PL Step 4 Release 2 claws outwards. Step 3 Bent the front panel unit slightly forward as arrow shown. Step 5 Remove the front panel unit. Note: Ensure 2 claws located at the bottom chassis is seated into the 2 slots at bottom of front panel at 2 catches (one on each side) of bottom chassis to be aligned to front panel’s slot.
SA-AK250PL Step 1 Remove 2 screws. Step 2 Desolder wire at deck motor terminals. Step 3 Remove Deck P.C.B. 10.15. Disassembly of Traverse Unit · Follow the (Step 1) - (Step 5) of Item 10.4 · Follow the (Step 1) - (Step 4) of Item 10.5 Important notes: Ensure all the trays are in the “STOCK”...
SA-AK250PL Step 3: Remove the traverse unit as arrow shown. · Assembly of Traverse Unit Step 2: Push the traverse slide plate as arrow shown to lock the traverse unit. Step 1: Turn over the unit and install the traverse unit.
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SA-AK250PL 10.16.1. Replacement of Pinch Roller and Head Block...
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SA-AK250PL 10.16.2. Replacement of Motor, Capstan Belt A, Capstan Belt B, and Winding Belt...
SA-AK250PL 10.18. Disassembly of cassette lid · Follow the (Step 1) - (Step 4) of Item 10.4 · Follow the (Step 1) - (Step 4) of Item 10.5 · Follow the (Step 1) - (Step 5) of Item 10.10 · Follow the (Step 1) - (Step 3) of Item 10.13 Step 1 Open the cassette lid.
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SA-AK250PL Note: Follow 10.18 Disassembly of cassette lid (Step1) to (Step 3). Remove the cassette tape.
SA-AK250PL 11 Service Fixture and Tools Service Tools Extension FFC (A) Deck P.C.B. - Main P.C.B. REEX0485 (14 Pins) 12 Service Positions Note: For description of the disassembly procedures, see the Section 10. 12.1. Checking and Repairing of Main P.C.B.
SA-AK250PL 13 Procedure for Checking Operation of Individual Parts of Deck Mechanism Unit 13.1. Operation Check with Cassette Tape 1. Pull up the EJECT lever using a rubber band. (Fig. 6) 2. Supply DC5V to MOTOR. (→ MOTOR rotates.) (Fig. 5) 3.
SA-AK250PL 14 Measurement And Adjustments 14.1. Cassette Deck Section 14.1.1. Requirements · Test tape (QZZCFM) (QZZCWAT) · Normal blank cassette tape (QZZCRA) · Digital frequency counter · Oscilloscope · Electrical voltmeter · Headphone jack output jig (Fig 8) 14.1.2. Setting of Unit ·...
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SA-AK250PL Fig. 10 Fig. 11 14.1.5. Bias Voltage Check 1. Connect an electrical voltmeter. (Fig 12) (Fig 9 for location of test point) 2. Set the function to “TAPE” position. 3. Insert a normal blank cassette tape (QZZCRA). 4. While pressing and holding down [REC( )] button, press [TAPE( )] button to pause the recording mode.
SA-AK250PL 15 Voltage and Waveform Chart Note: Circuit voltage and waveform described herein shall be regarded as reference information when probing defect point, because it may differ from an actual measuring value due to difference of Measuring instrument and its measuring condition and product itself.
SA-AK250PL 16 Wiring Connection Diagram JK2803 9 ..1 CN3601 H5104 CN2810 TUNER PACK MOTOR CN2809 POWER P.C.B. SOLDER SIDE CN2801 MAIN P.C.B. SOLDER SIDE RIGHT SPEAKER TO CRS1 JK5103 (CN1) LEFT SPEAKER CN2808 CN2805 CN5103 1 .
SWITCH PROCESSOR/ TO MAIN CN7002 CN2801 (1/2) DIGITAL FILTER 3.3V 3.3V 3.3V 3.3V D/A CONVERTER MUTE PC1 4 CN7002 CN2801 [CH1] LCH OUT 3.3V TO MAIN CN7002 CN2801 (2/2) RCH OUT MUTE PC2 2 [CH2] SA-AK250PL CD SERVO BLOCK DIAGRAM...
MUTE 3.3V SWITCH SWITCH QR2501, QR2502 Q2511 MUTE SWITCH MUTEA SWITCH DRIVER ASPDA ASPCLK IDCDET Q2942 FAN MOTOR ON/OFF SWITCH TO FAN Q2943 FAN SUPPLY CONTROL SWITCH Q2949 Q2948 D2946 DC DETECT DC DETECT SWITCH SWITCH SA-AK250PL MAIN (1/2) DIAGRAM...
TO MAIN (2/2) Z6481 REMOTE SENSOR JK6751 TO MAIN MUSIC PORT (1/2) S6201-S6207 TO MAIN (2/2) JK6551 HEADPHONE TO MAIN (1/2) SUB PANEL CIRCUIT S6301-S6309 VR6491 +VREF MIC VOLUME +VREF TO MAIN (2/2) S6106,S6108 S6101-S6105 SUB PANEL P.C.B SA-AK250PL PANEL DIAGRAM...
FAN ON/OFF SWITCH SWITCH D5126 TO MAIN (1/2) Q5111 Q5101,Q5110 +15V REGULATOR Q5102 Q5108,Q5109 CURRENT CONTROL SWITCH TO TRANSFORMER Q5112,Q5114 Q5113 CURRENT STABLISER CURRENT LMIITER 11V REGULATOR SWITCH IC5101 TO MAIN C0DAZYY00005 (2/2) REGULATOR IC D5130 5.6V 3.3V SA-AK250PL POWER DIAGRAM CTRL...
: AM SIGNAL LINE : FM/AM/XM SIGNAL LINE : VIDOE SIGNAL LINE : FM SIGNAL LINE : AUX/IPOD SIGNAL LINE ) Indicates the Pin No. of Right Channel. NOTE : Signal Lines are applicable to the Left Channel only. SA-AK250PL TRANSFORMER DIAGRAM...
SA-AK250PL 18 Notes Of Schematic Diagram (All schematic diagrams may be modified at any time with : Main Signal line the development of new technology) : FM/AM Signal line Notes: S971: Mode switch. : Tape Record Signal line S972: Half switch.
SA-AK250PL 19.2. (B) Main Circuit SCHEMATIC DIAGRAM - 2 MAIN CIRCUIT : +B SIGNAL LINE : CD SIGNAL : TAPE RECORD SIGNAL LINE : TAPE PLAYBACK SIGNAL LINE : FM/AM SIGNAL LINE : MAIN SIGNAL LINE : AUX SIGNAL LINE...
C2325 R2329 C2321 R2321 50V1 LOW_L-IN IN SCHEMATIC R2326 R2356 DIAGRAM-9 LOW_R-IN 180k C2329 A_GND 4700P SUBW C2330 R2456 W586 180k 0.22 R2417 R2418 100k Q2417 R2416 2.2k C2943 50V2.2 W673 W654 TO MAIN SECTION (4/4) W757 SA-AK250PL MAIN CIRCUIT...
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SA-AK250PL SCHEMATIC DIAGRAM - 4 MAIN CIRCUIT : +B SIGNAL LINE : CD SIGNAL LINE : FM/AM SIGNAL LINE : MAIN SIGNAL LINE : AUX SIGNAL LINE R2284 W658 W617 R2285 D2811 B0ADCJ000020 R2894 R2121 3.3k TO MAIN SECTION (1/4)
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Q2937 D2937 Q2936 28 27 25 24 21 20 12 11 11 12 13 14 B1ACKD000006 CD SUPPLY CONTROL SWITCH Q2937 B1GBCFJJ0051 CHANGER PLUNGER CN2806 CN2805 ON/OFF SWITCH TO CRSI (CN1) PANEL CIRCUIT (CN6601) IN SCHEMATIC DIAGRAM-6 SA-AK250PL MAIN CIRCUIT...
SA-AK250PL 22 Terminal Function of IC's 22.1. IC7001 (MN6627954MA) Servo Processor,Digital Signal Processor/Digital filter and D/A Converter Pin No. Mark Function Pin No. Mark Function DRAM address signal O/P 11 DSLF Loop Filter Terminal (For DSL) DRAM address signal O/P 9...
SA-AK250PL 22.2. IC7002 (BA5948FPE2) IC 4CH Drive Pin No. Mark Function Pin No. Mark Function Motor Driver 92 Input Motor Drive (3) reverse - action output Turntable Motor Drive Signal (“L”:ON) Motor Drive (3) forward - action output Motor Drive (1) Input...
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SA-AK250PL Pin No. Mark Function MCLK CD Command Clock Output /RESET_SW CD Limit Switch Input for the most Inner Point (Active Low) HOME_SW Home Switch for CRS1 CD_RST CD Reset output CLOSE_SW CLOSE switch for CRS1 OPEN_SW Open switch for CRS1...
SA-AK250PL 24 Replacement Parts List Notes: · Important safety notice: Components identified by mark have special characteristics important for safety. Furthermore, special parts which have purposes of fire-retardent (resistors), high-quality sound (capacitors), low noise (resistors), etc are used. When replacing any of these components, be sure to use only manufacturer’s specified parts shown in the parts list.
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SA-AK250PL Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks REM0120 CAP MOTOR ASS’Y Q2949 B1ABCF000176 TRANSISTOR RHD26022-1 MOTOR SCREW Q3601 2SC3940A0A TRANSISTOR XTW2+5LFJ H/BLOKC UNIT SCREW Q5101 B1DEGM000026 TRANSISTOR XTW26+10SFJ...
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SA-AK250PL Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks D5954 B0EAKP000134 DIODE D5955 B0EAKP000134 DIODE CS971 RJU071H09M1 9P CONNECTOR D5956 B0EAKP000134 DIODE D5957 B0EAKP000134 DIODE COILS & TRANSFORMERS D5958 B0EAKP000134...
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SA-AK250PL Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks W645 ERJ6GEY0R00V CHIP JUMPER E5101 K9ZZ00001279 EARTH PLATE W646 ERJ6GEY0R00V CHIP JUMPER E5103 K9ZZ00001279 EARTH PLATE W647 ERJ6GEY0R00V CHIP JUMPER W648...
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SA-AK250PL Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks W1012 ERJ8GEY0R00V CHIP JUMPER R1203 D0GB183JA008 18K 1/16W W7001 D0GDR00JA017 CHIP JUMPER R1204 D0GB103JA008 10K 1/16W W7002 D0GDR00JA017 CHIP JUMPER R1205 D0GB222JA007 2.2K 1/16W...
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SA-AK250PL Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks R2248 D0GB682JA008 6.8K 1/16W R2676 D0GBR00JA008 0 1/16W R2249 D0GB332JA007 3.3K 1/16W R2677 ERJ6GEYJ271V 270 1/10W R2251 D0GBR00JA008 0 1/16W R2701...
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SA-AK250PL Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks R2948 D0GB101JA007 100 1/16W R5953 D0AE151JA048 150 1/4W R2949 D0GB473JA041 47K 1/16W R5957 D0AE103JA048 10K 1/4W R3210 D0GB104JA007 100K 1/16W R5958...
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SA-AK250PL Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks R7601 ERJ3GEYJ4R7V 4.7 1/16W C2183 ECJ1VB1C224K 0.22 16V R7650 ERJ3GEYJ5R6V 5.6 1/16W C2191 F2A1H3R3A234 3.3 50V C2192 F1H1C104A041 0.1 16V K3300...
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SA-AK250PL Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks C2753 F1H1C104A042 0.1 16V C5301 ECJ1VB1A474K 0.47 10V C2802 F2A1H3R3A234 3.3 50V C5302 F1H1H331A013 330P 50V C2803 F1H1A105A025 1 10V C5303 ECJ1VB1A474K 0.47 10V...