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1、MICRO COMPONENT SYSTEM SERVICE MANUAL MODEL: LX-U250A, LXS-U250 SERVICE MANUAL MODEL: LX-U250A, LXS-U250 RadioFans.CN 收音机爱 好者资料库 - 1-1 - CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS
2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 SECTION 2. ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . .
3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WAVEFORMS OF MAKOR CHECK POINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、 2-22 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 WIRING DIAGRAM . . . . . . . . . . . . . .
5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45 PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47 SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . .
6、. . . . . . . . . . . . . . . . . .3-1 SINGLE DECK MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3 CD MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5 SECTION 4.
7、 SPEAKER SECTION MODEL: LXS-U250, LXS-W250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 Radi
8、oFans.CN 收音机爱 好者资料库 - 1-5 - SPECIFICATIONS NOTE : Specification are subject to change without notice in the course of product improvement. RadioFans.CN 收音机爱 好者资料库 - 2-1 - CD PART TROUBLESHOOTING GUIDE SECTION 2. ELECTRICAL TURN ON CD OPEN CLOSE CHECK “ READING ” DISPLAY CHECK READING OK CHECK IF PLA
9、Y, AUDIO OUTPUT CHECK OK CONNECTOR CHECK (PN806) CHECK LC78690W (IC801) CHECK AM5810FP (IC802) CHECK PICKUP MOVEMENT CONNECTOR CHECK(PN801,PN802) CHECK MICOM INTERFACE CIRCUIT( PN805 ) CONNECTOR CHECK ( PN802, PN804, PN806 ) CHECK MICOM INTERFACE CIRCUIT( PN805 ) CHECK POWER SUPPLY CIRCUIT( PN806 )
10、CONNECTOR CHECK ( PN804, PN806 ) - 2-2 - OPEN CLOSE NG CONNECTOR LOCKING CHECK ( PN804 ) CHECK POWER SUPPLY CIRCUIT( PN805, PN806) PN 806 PIN 4 = 12V, PIN 5 = 6.2V PN805 PIN 1 = 5V CHECK VOLTAGE CHANGE OF OPEN CLOSE , AND IC802 INPUT VOLTAGE PIN 7, 8, 20 (=6.2V) (PN805 PIN 2:BTL_MUTE, 14:OPEN 15:CLO
11、SE) DEFECTIVE MAIN POEWR SUPPLY DEFECTIVE MICOM DEFECTIVE MECHANISM - 2-3 - “ READING ” DISPLAY CHECK (= ONLY “CD “DISPLAY) CONNECTOR LOCKING CHECK (PN802, PN804,PN805,PN806 ) DEFECTIVE CONNECTOR OR MAIN POWER SUPPLAY DEFECTIVE IC804 DEFECTIVE MICOM OR CONNECTOR DEFECTIVE MICOM OR CONNECTOR DEFECTIV
12、E IC801 CHECK VOLTAGE THE PIN 2 OF IC804 IC804 PIN 2 :3.3V CHECK RESET SIGNAL OF PN805 PN805 PIN 4 :3V CHECK POWER SUPPLY PORT( PN805 ,PN806) PN 806 PIN 4 = 12V, PIN 5 = 6.2V PN805 PIN 12 = 5V CHECK MICOM INTERFACE CIRCUIT( PN805 ) PN805 PIN 3,4,5,6,7,8,9 SIGNAL CHECK (3:WRQ, 4 :RESET 5 :DO, 6:DI, 7
13、 :CL 8:CE, 9:FSEQ) CHECK THE WAVE FORM #1 - 2-4 - READING OK CHECK (= “NO DISC” DISPLAY) CONNECTOR LOCKING CHECK(PN801,PN802) DOES SLED MOVE ? DOES LENSE MOVE ? (= UP & DOWN) CHECK PN802 PIN 3,4( SL+,SL-) A B C D E CHECK PN801 PIN 13,16( FA-, FA+) CHECK PN801 PIN 10( LD ) CHECK PN802 PIN 5,6( SP+,SP
14、-) CHECK PN801 PIN 14,15 (TA-, TA+) DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC802OR IC801 DOES LASER LIGHT ? DOES SPINDLE ROTATE ? IS READING OK ? - 2-5 - READING OK CHECK #A (= “NO DISC” D
15、ISPLAY) A DOES SL+ WAVEFORM APPEAR AT ( IC802 PIN 13 AND PN 802 PIN 3) WAVEFORM #2 SLED MOTOR WAVE DOES SLIN WAVEFORM APPEAR AT ( IC802 PIN 5) WAVEFORM #2 SLED DRIVE WAVE CHECK PN802 CONNECTOR LINE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP SLED MOTOR - 2-6 - READING
16、OK CHECK #B (= “NO DISC” DISPLAY) B DOES FA+ WAVEFORM APPEAR AT ( IC802 PIN 16 AND PN801 PIN 13) WAVEFORM #3 FOCUS COIL DRIVE WAVE DOES FAIN- WAVEFORM APPEAR AT ( IC802 PIN 25) WAVEFORM #3 FOCUS DRIVE WAVE CHECK PN801 CONNECTOR LINE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PN801 CONNECTOR DEFECTIVE
17、 PICKUP FOCUS ACTUATOR - 2-7 - READING OK CHECK #C (= “NO DISC” DISPLAY) C IS ?V APPLIED TO PIN10 OF PN501 LASER SUPPLY VOLTAGE CHECK CHECK PN801 CONNECTOR LINE IS 3.3 V APPLIED TO PIN30,36,39,41,61,68,75 OF IC801 RF IC SUPPLY VOLTAGE CHECK IS 2.3 V PIN18 OF IC801 LASER CONTROL VOLTAGE CHECK DEFECTI
18、VE IC804 DEFECTIVE IC801 DEFECTIVE Q801 OR D801 DEFECTIVE PN801 CONNECTOR DEFECTIVE PICKUP LASER PART - 2-8 - READING OK CHECK #D (= “NO DISC” DISPLAY) D DOES SP+ WAVEFORM APPEAR AT ( IC802 PIN 11 AND PN802 PIN 5) WAVEFORM #4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT ( IC802 PIN 6) WAVEF
19、ORM #4 SPINDLE DRIVE WAVE CHECK PN802 CONNECTOR LINE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICKUP SPINDLE MOTOR DEFECTIVE PN802 CONNECTOR - 2-9 - READING OK CHECK #E (= “NO DISC” DISPLAY) E DOES TA+ WAVEFORM APPEAR AT ( IC802 PIN 17 AND PN801 PIN 14) WAVEFORM #5 TRACKING COIL DRIVE WAVE CHECK PN
20、802 CONNECTOR LINE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP OR IC801 DEFECTIVE PICKUP OR IC801 DOES ARF SIGNAL APPEAR? (IC801 PIN 2 ) WAVEFORM #6 DOES FE, TE SIGNAL APPEAR? (IC801 PORT FE:10, TE:16) WAVEFORM #6 DOES TAIN- WAVEFORM APPEAR AT ( IC802 PIN 22) WAVEFORM
21、#5 TRACKING DRIVE WAVE - 2-10 - #1. MICOM INTERFACE WAVEFORM (PN805 PIN 3, 4, 5, 6) during power on PIN 6 : DI PIN 5 : DO PIN 4 : RESET PIN 3 : WRQ #1. MICOM INTERFACE WAVEFORM (PN805 PIN 3, 4, 5, 6) during normal play PIN 6 : DI PIN 5 : DO PIN 4 : RESET PIN 3 : WRQ #1. MICOM INTERFACE WAVEFORM (PN8
22、05 PIN 7, 8, 9) during power on PIN 9 : FSEQ PIN 8 : CE PIN 7 : CL #1. MICOM INTERFACE WAVEFORM (PN805 PIN 7, 8, 9) during normal play PIN 9 : FSEQ PIN 8 : CE PIN 7 : CL WAVEFORMS OF MAKOR CHECK POINT - 2-11 - #2. SLED DRIVE AND MOTOR WAVEFORM (IC802 PIN 5, 13) when focus search #3. FOCUS DRIVE AND
23、MOTOR WAVEFORM #3. FOCUS DRIVE AND MOTOR WAVEFORM (IC802 PIN 25, IC802 PIN 16) (IC802 PIN 25, IC802 PIN 16) When focus search failed or there is no disc on trayThere is disc on tray and focus search success PIN 5 : SLIN PIN 13 : SL+ PIN 25 : FAO PIN 16 : FA+ #2. SLED DRIVE AND MOTOR WAVEFORM (IC802
24、PIN 5, 13) during normal play PIN 5 : SLIN PIN 13 : SL+ PIN 25 : FAO PIN 16 : FA+ - 2-12 - #5. TRACK DRIVE AND MOTOR WAVEFORM (IC802 PIN 22 , IC802 PIN 17) during normal play #4. SPINDLE DRIVE AND MOTOR WAVEFORM (IC802 PIN 6, 11) when TOC reading PIN 6 : SPIN PIN 11 : SP+ PIN 22 : TAO PIN 17 : TA+ #
25、6. RF, FOCUS AND TRACKING ERROR WAVEFORM (IC801 PIN 2, 10, 16) during normal play PIN 2 : RFOUT PIN 10 : FE PIN 16 : TE - 2-13 - USB PART TURN ON USB “CHECKING ”OR “USB”DISPLAY CHECK READING OK CHECK OK CONNECTOR CHECK ( PN805, PN806, PN810 ) CHECK POWER SUPPLY CIRCUIT( PN806 ) CHECK MICOM INTERFACE
26、 CIRCUIT( PN805 ) CHECK PN810 1 PIN :5V CHECK PN810 PIN 2(D-), 3(D+) CHECK OTI6888 (IC805) CHECK LC78690W (IC801) CONNECTOR CHECK (PN806) IF PLAY, AUDIO OUTPUT CHECK - 2-14 - VKK CHECK P-SENS CHECK PN301 3Pin DC -27V CHECK OK ZD900 (+)VOLTAGE CHECK (5V) IC301 26PIN PATTERN CHECK ZD901 (-)-27V CHECK
27、D912(+)WAVE CHECK D912 CHANGE YES YES NO NO YES Q900 TURN ON CHECK C921(-)-27V UNDER VOLT CHECK YES NO D907,D906 CHANGE OK VOLTAGE CHECK LIST YES NO Q900 CHANGE YES NO - 2-15 - VOLTAGE CHECK ALL Fuse CHECK IC901,IC902 INPUT DC VOLT CHECK C904(+),C905(-)DC VOLT OUTPUT CHECK D700 CHANGE TransformerCHA
28、NGE IC301 Troubleshooting CHECK MUTE YES FUSE CHANGE CN900 (-)1,2 PIN,(+)5,6 PIN OUTPUT VOLTAGE,D900 CHECK YES NO YES NO NO IC903 Output DC VOLT CHECK (6.2V) D901,D902,D903,D904 COMPONENT CHECK AND CHANGE Transformer CHANGE YES CN901 7 Pin DC VOLTOUTPUT CHECK YES NO NO IC903 Output DC VOLT CHECK (6.
29、2V) D908 +12V CHECK AND CHANGE IC901 CHANGE YES D909,D910 VOLT CHECK YES YES NO NO SECTION CHECK YES NO IC904 CHANGE Q500 CHECK AND CHANGE YES IC904 1PIN (+)High CHECK NO NO Muting CIRCUIT Troubleshooting (MUTE CONDITION) Q201,Q251,Q600,Q650 Base High IC201Troubleshooting CHECK (ONLY Q201/Q251) YES
30、NO Q504 EMITTER HIGH(ONLY Q714/Q715) NO Q201,Q251,Q600,Q650 Collector Low MUTE TR CHANGE YES NO Q504 CHANGE YESNO - 2-16 - NO SOUND IC905 17,22 PIN OUTPUT CHECK POWER CIRCUIT CHECK IC905 Troubleshooting VIEWYES NO SPK Relay troubleshooting VIEWYES NO IC905 INPUT CHECK(FUNK BLOCK INPUT CHECK) Muting
31、troubleshooting VIEWYES NO RY700 CONTROL CHECK OK SPK Relay Troubleshooting (ONLY LX-W550s) D503 (+)12V CHECK VOLTAGE CHECK LISTYES NO RELAY CHANGE (RY700)YES NO Q511 Collector LowCHECK IC204 TroubleshootingYES NO Q511 CHANGE Q511 Base HighYES NO OUTPUT SOUND CHECK OK - 2-17 - FUNCTION MODE (NO SOUN
32、D) TAPE IC905 3,36PIN INPUT SIGNAL CHECK IC204 Troubleshooting YES YES TUNER IC905 2,37 PIN INPUT SIGNAL CHECK IC102 Troubleshooting YES YES DAB/L BAND/DAB+L IC905 6,33 PIN INPUT SIGNAL CHECK IC102 Troubleshooting YES YES CD IC905 4,35 PIN INPUT SIGNAL CHECK CD Troubleshooting YES YES AUX IC905 5,34
33、 PIN INPUT SIGNAL CHECK JK600 INPUT CHECK YES YES - 2-18 - IC301 Troubleshooting IC204 Troubleshooting IC301 TROUBLE SHOOTING IC301 17,46,72,90 INUT VOLT.CHECK VOLTAGE CHECK LIST YES NO IC301 26Pin 5V INPUT CHECK P-SENS SECTION CHECK YES NO X301 CHECK X301 CHANGE YES NO IC301 17Pin VOLT INPUT (Low H
34、igh) OK RESET SECTION CHECK YES NO IC204 16Pin INUT VOLT.CHECK VOLTAGE CHECK LIST YES NO IC204 2,3 Pin CLK Data CHECK IC301 3,4Pin Data CHECK (CD,TAPE FUNCTION MODE) YES NO CONTROLL FUNC.CHECK OK IC204 CHANGE YES NO IC301 CHANGE IC301,IC204 pattern check YES YES NO - 2-19 - FM(TUN600)CHECK TUN600 2P
35、IN 9V CHECK VOLTAGE CHECK LIST YES NO TUN600 7,8,9PIN CLOCK DATA CHECK TUN600 3,5PIN OUTPUT CHECK IC301 7,8,9 PIN CLOCK DATA CHECK OK YES YES NO TUN600 CHANGE NO IC301 Troubleshooting YES IC905 Troubleshooting FUNC CLOCK DATA 19,20PIN CHECK VOLTAGE CHECK LIST YES 21 PIN VOLT CHECK EACH FUNC MODE (IN
36、PUT SIGNAL CHECK) 17,22 Pin OUTPUT SIGNAL CHECK YES NO FUNC Troubleshooting EACH FUNC MODE (INPUT SIGNAL CHECK) YES NO SPK Relay SECTION CHECK YES NO - 2-20 - PLAY MODE CHECK IC201 46Pin VCC CHECK VOLTAGE CHECK LIST YES NO Deck Mecha CHANGE NO IC201 3,6 Pin Signal Output CHECK Muting SECTION CHECK D
37、eck Mecha MOVE CHECK YES NO IC201 CHANGE YES REC CHECK (Q202,Q252 ON:R220,270 HIGH) IC203 2,8Pin INPUT SIGNAL CHECK Q202,Q252 Base LowCHECK YES NO IC203 3,7 Pin OUT IC202 6(12V),4 Pin High check IC203 6Pin VCC volt check YES NO IC203 Troubleshooting NO Q202,Q252 CHANGE YES L201 2,3PIN check Power Ch
38、eck,IC202 Troubleshooting YES NO VOLTAGE CHECK LIST NO DECK CHANGE C227(+)INPUT VOLT CHECK YES NO Q205 Base 0.6V CHECK YES IC203 Troubleshooting NO Q205 Collector Low YES Q205 CHANGE NO Q204 CHANGE YES L201 CHANGE NO OK YES - 2-21 - DAB/DAB+L /L BAND(DAB600,DAB600L)CHECK DAB600,DAB600L 4PIN 3.3V INP
39、UT CHECK VOLTAGE CHECK LIST (ONLY DAB series MODEL) YES NO DAB600,DAB600L 11,13PIN PIN CLOCK DATA CHECK DAB600,DAB600L 6,8PIN OUTPUT CHECK IC301 75,76 PIN CLOCK DATA CHECK YES NO OK DAB600,DAB600L CHANGE YES NO IC301 Troubleshooting YES - 2-22 - INTERNAL BLOCK DIAGRAM of ICs NJW1190 BLOCK DIAGRAM -
40、2-23 - PIN FUNCTION (SSOP44) - 2-24 - PIN FUNCTION (QFP48-P1) - 2-25 - IC805 BLOCK DIAGRAM PLL RISC Program RAM Clock Divider UHC Interrupt LED USB Transceirver LED12 D- D+ 14.318MHz I2V Bit Stream MP3 decoder Input Button DAC USB device PIN CONFIGUARTION GPIOA 7 GPIOA 6 NC NC NC NC gnd vdd LED1_out
41、 NC GPIOA 5 GPIOA 4 1 2 3 4 5 6 7 8 9 10 11 12 25 26 27 28 29 30 31 32 33 34 35 36 GPIOB 2 NC GPIOB 0 sda scl NC vdd xtal2 xtal1 gnd reset_b NC GPIOA 0 GPIOA 1 NC NC NC vdd gnd NC NC NC GPIOA 2 GPIOA 3 NC SIC REQ SID NC vdd DPLS_IO DMNS_IO gnd GPIOB 1 ext_int5 GPIOB 3 13 14 15 16 17 18 19 20 21 22 2
42、3 24 37 38 39 40 41 42 43 44 45 46 47 48 - 2-26 - PIN CONFIGUARTION ex_romdata 5 ex_romdata 6 GPIOA 7 GPIOA 6 gnd vdd LED1_out GPIOA 5 GPIOA 4 ex_romaddr 12 ex_romaddr 11 ex_romaddr 10 ex_romaddr 9 gnd vdd ex_romaddr 8 ex_romaddr 4 ex_romaddr 5 ex_romaddr 6 vdd gnd ex_romaddr 7 GPIOA 0 GPIOA 1 vdd g
43、nd GPIOA 2 GPIOA 3 GPIOB 4 GPIOB 6 ex_romdata 2 ex_romdata 3 txd1 ex_romdata 7 ex_romdata 6 SIC REQ SID vdd DPLS_IO DMNS_IO gnd GPIOB 1 host_dev_sel gnd ex_romaddr 15 ex_romaddr 14 ex_romaddr 13 ex_romaddr 0 ex_romaddr 1 gnd sda scl vdd xtal2 xtal1 gnd reset_b mode0 ex_romdata 0 ex_romdata 1 ex_roma
44、ddr 2 ex_romaddr 3 rxdi1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 - 2-27 - AM5810 (IC802) BLOCK DIAGRAM PIN CONFIGURATION VO2 ( + ) FWD REV IN2 VO2 ( - ) BIAS
45、 OPIN4 ( + ) OPIN4 ( - ) MUTE GND VO3 ( - ) VO3 ( + ) OP OUT4 OPIN3 ( + ) OPIN3 ( - ) OPOUT3 POWVCC34 VO4 ( - ) VO4 ( + ) LDCONT PS IN PR EVCC VOL ( - ) VOL ( + ) 22 21 20 19 18 17 16 15 23 24 25 26 27 12 14 10 11 9 7 6 5 4 3 2 1 8 28 AM5810 POWVCC12 VO1 ( - ) VO1 ( + ) 13 - 2-28 - PIN DESCRIPTION B
46、LOCK DIAGRAM 2-292-30 2-312-32 WMA/USB BLOCK DIAGRAM 2-332-34 SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAM 2-352-36 FRONT SCHEMATIC DIAGRAM 2-372-38 POWER SCHEMATIC DIAGRAM 2-392-40 DECK SCHEMATIC DIAGRAM 2-412-42 CD SCHEMATIC DIAGRAM 2-432-44 USB SCHEMATIC DIAGRAM 2-452-46 WIRING DIAGRAM 2-472-48 PRIN
47、TED CIRCUIT DIAGRAMS MAIN P.C. BOARD 2-492-50 FRONT P.C. BOARD CDP P.C. BOARD (COMPONENT SIDE) 2-512-52 2-532-54 CDP P.C. BOARD (SOLDER SIDE) 2-552-56 LINEAR POWER 3-13-2 250 252 254 253 258 256 255 257 259 450 261 262 305 A47 450 263 A46 A26 A41 260 A43 A00 301 SECTION 3. EXPLODED VIEWS CABINET AND
48、 MAIN FRAME SECTION 3-33-4 013 026 403 501 020 019 404 503 023 018 012 009 011 024 025 503 027 029 001 006 030 032 031 003 007 002 008 504 038 033 034 035 036 005 039 505 037 010 028 019 016 015 014 401 402 004 504 SINGLE DECK MECHANISM LOCA.NO.LG PART NO.DESCRIPTIONSPECIFICATION A006720AF0007ADECK,
49、AUDIOCMAL1Z2 ALPS L-SINGLE A/RVS 0016768RZAA04ADECK MECHANISM PARTSFD58P- ALPS ARM PLAY 0026768RZBA04ADECK MECHANISM PARTSFF19U-31 ALPS BELT/FELT A/R A/ 0036768RZBA05ADECK MECHANISM PARTSFF19S-31 ALPS BELT/FELT A/R 0046768RZEA01ADECK MECHANISM PARTSF513-927 ALPS HEAD ASSY A/R 0056768RZGA03ADECK MECHANISM PARTSF522-063 ALPS GEAR A/R A/S 0066768RZGA04ADECK MECHAN
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