MF-FE421_GCSC.pdf

SERVICE MANUAL MODEL: MF-FE421MP3 PLAYER SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. 2005 MODEL: MF-FE421 [CONTENTS] ❍ SECTION 1. GENERAL • ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 • SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 • THE OTHER COMPONENTS (ACCESSORIES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 • IDENTIFICATION OF CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 ❍ SECTION 2. ELECTRICAL SECTION • TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 • INTERNAL BLOCK DIAGRAM OF ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 • BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 • SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 • PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 ❍ SECTION 3. EXPLODED VIEWS • CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 ❍ SECTION 4. REPLACEMENT PARTS LIST • REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 • REPLACEMENT PARTS LIST (LGEMT: TAIWAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5 - 1-1 - obtain and wear a commercially available discharging wrist strap device.1-2 - . 2. 1. GRAPHIC SYMBOLS] THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.SECTION 1. These can generate electrical charges sufficient to damage ESD devices. Do not use freon-propelled chemicals. . AND OBSERVE ALL OTHER SAFETY PRECAUTIONS. (Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam. Use only a grounded-tip soldering iron to solder or unsolder ESD devices. Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it. (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 sufficient to damage an ESD device). IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. Use only an anti-static solder removal device. WITHIN AN EQUILATERAL TRIANGLE. drain off any electrostatic charge on your body by touching a known earth ground. 5. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. touch the protective material to the chassis or circuit assembly into which the device will by installed. which should be removed for potential shock reasons prior to applying power to the unit under test. 4. aluminum foil or comparable conductive materials). Immediately before removing the protective material from the leads of a replacement ESD device. Such components commonly are called Electrostatically Sensitive Devices (ESD). Some solder removal devices not classified as "anti-static" can generate electrical charges sufficient to damage ESD devices. GENERAL ❏ ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. 6. to prevent electrostatic charge buildup or exposure of the assembly. Minimize bodily motions when handing unpackaged replacement ESD devices. Immediately before handling any semiconductor component or semiconductor-equipped assembly. After removing an electrical assembly equipped with ESD devices. 7. place the assembly on a conductive surface such as aluminum foil. 3. CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT. 8. Alternatively. [CAUTION. . . . . . . . . . . . . .MF-FE421 : 128 MB MF-FE422 : 256 MB MF-FE425 : 512MB MF-FE429 : 1GB • Battery . . . . . . . . . . . . . . . . . . . . .8mm • Weight . . . . . . . . . . . . . . . . .68. . . . . . .38 dB Channel Separation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V DC • Dynamic Range . . . . . . . . . . . . .5MHz~108MHz S/N Ratio . . . . . . . . . . . . . . . . . . . . . . .20 dB Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40/40dB (1kHz/10kHz) • Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5mW+5mW • Channel Separation . . . . . . . . . . . . . .87. . . . . . . . . . . . . . . . .55/80dB(No Filter/JIS-A Filter) • Earphone Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2x22. . . . . . 0dB/1 6Ω) • Equalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .❏ SPECIFICATIONS • Memory Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5mW + 5mW (1kHz. . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 - . . . . . . . . . . . . . . . . . . . . . .1. . . . . . . . . . . . . . .FLAT/JAZZ/CLASSIC/POP/ROCK/ClASSIC/POP/CONCERT/USER SRS/TRUBASS/WOW FM radio • • • • Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2x30. . . . . . . . . .45g (without battery) • Operating Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Earphone Antenna ❏ THE OTHER COMPONENTS (ACCESSORIES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .AAA type (1EA) • Dimensions (WxHxD) . . . . . . . . . . . . STEREO indicator.MARK Low folder indicator high folder indicator Music file MIC 003/004 Love is game.mp3 HOLD PLAY MODE REC BUTTON Menu button • Menu • -FM/MP3 B.mp3 HOLD button singer and song title Battery remaining B. Radio transmitter indicator Side part Play/Pause Power(ON)/(OFF) REW/FF 003/004:12 POP Love is game.MARK button Preset button DISPLAY (FM Radio) Preset number MONO indicator.0 MHz FM Radio indicator Frequency indicator channel indicator FM Radio indicator . Mute MO CH-01 93.1-4 - . Lyrics file indicator Current track number/ Total track number.❏ IDENTIFICATION OF CONTROLS Front/Rear part Upper/Bottom part USB In/Out Earphone connector external input terminal Battery cover DISPLAY (MP3) Volume Sound quality effect Repeat indicator. YES Output circuit check. Memory check. connection status check. Key circuit check. No Tuner power circuit check. No Is MP3 played? Ear Phone Jack check. FM Transmitter works properly? No Power control circuit check. YES Tuner output terminal check. ELECTRICAL SECTION ❏ TROUBLESHOOTING Assemble set USB connection to PC is OK? No USB Jack check. Is LCD turned on when pressing play key? No Power circuit check. LCD circuit check. YES EL power circuit check. YES USB related power circuit check.SECTION 2. No Line In input circuit check. STMP3520 circuit check. YES OK . MIC recording works properly? YES Line recording works properly? YES Radio works properly? No MIC input terminal check.2-1 - . Tuner input terminal check. PN401. PN402 repair. YES Resistance between JK461 #5 and JK461 Frame is less than 10Ω? YES F/W update is successful? NO JK461 defective. JK461 #3 and CN401 #4 are connected properly each other? NO PN401 or CN401 soldering defective of PCB pattern defective.1. JK461 #2 and CN401 #3. CN402. C402 one terminal voltage is 5V? YES YES NO B to B connector connection or PCB Pattern check. CN402. USB operation connection USB connection to PC YES NO PC detects USB? NO Set's L463 both terminal voltage is 5V? YES JK461 check.2-2 - .5V? NO IC401 defective. PN402? NO CN401. C419 +voltage is 3V C422 +voltage is 1. PN401. YES YES Is there cold solder or short in CN401. YES OK IC401 or IC462 defective soldering or defective parts . one of L403 pins does normal switching? (about 3. Power check Insert battery YES NO When pressing play key. PN401. PN402.2-3 - .3V related part short check YES YES C422 + votage is 1. 1.2. EL lisghts? L403 voltage is 1.4V C419+ voltage is 3V? NO No voltage part short check YES NO Power is supplied to IC461? Q461 related part check YES NO Power is supplied to IC461? IC461 related circuit check YES EL PAD cold solder or Back Light defective. CN462 soldering check YES OK . CN402.5V? NO Check path from battery to L403. LCD displays normal initial screen? NO CN401. YES NO When pressing play key.2V on/off) IC401 or 3V. then check the path form line out to JK405 YES OK 4.2-4 - . then start playing by pressing play key again. YES Stop by pressing play key. then start recording. YES When pressing play key. YES Switch to line in recording by using menu key and play key. MP3 play check MP3 Mode power On YES NO Play key is pressed normally? Check each key and related resistance. YES OK . YES Input signal is recorded normally? NO Check the path from JK491 to CN404.3. Recording check MP3 Mode power On YES Press REC key twice. YES Voice is recored normally? NO Check MIC401 and surrounding circuit. sound comes out normally? NO Check volume. YES YES 3V comes out form TU401 #4? YES TU401 check NO IC402 related circuit check. YES FM Transmitter is switched from off to on? YES R415 and FMT status path check. Radio check Radio Mode Power on YES Channel seek is counted normally? NO Seek TU401 6. 7 is counted normally? NO R449. Frequency tuning is working? L404.2-5 - . R448. YES OK 6. YES OK . C439 check. FM Radio can catch signal? Q402 and surrounding circuit check. R414 TU401 check.5. FM Transmitter check MP3 Mode power on YES Connect FM Transmitter. L408 check YES Sound is normal? C438. then turn on FM Transmitter by using menu key. ❏ INTERNAL BLOCK DIAGRAM OF ICs I Main CPU STMP 3520 • BLOCK DIAGRAM I Tuner Module MP301 • BLOCK DIAGRAM Right Out Left Out VDD_FM 4 1.2-6 - .8 6 7 I2C Clock I2C Data .3.5. 2-7 - .I EL Driver D355B • Block Diagram . MEMO .2-8 - . ❏ BLOCK DIAGRAM 2-9 2-10 . ❏ SCHEMATIC DIAGRAM • MAIN SCHEMATIC DIAGRAM 2-11 2-12 . • JACK SCHEMATIC DIAGRAM 2-13 2-14 . • MEMORY SCHEMATIC DIAGRAM 2-15 2-16 . ❏ PRINTED CIRCUIT DIAGRAMS • MAIN P. BOARD 2-17 2-18 .C. • JACK P.C. BOARD 2-19 2-20 . C. BOARD 2-21 2-22 .• MEMORY P. SECTION 3. EXPLODED VIEWS • CABINET AND MAIN FRAME SECTION 252 261 A41 282 253 451 450 254 450 260 264 262 451 251 281 283 A45 450 451 263 280 255 275 274 451 292 250 A44 291 451 290 A46 271 273 270 A42 A45 272 3-1 3-2 .