Page 1
Internal Use Only MINI HI-FI SYSTEM SERVICE MANUAL MODEL: CM8460 (CM8460, CMS8460F/W) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN77612042 NOVEMBER, 2016...
SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. Storage in conductive bag Drop impact 2.
Page 5
NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.
ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD 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 static electricity.
HIDDEN KEY MODE HIDDEN MODE ENTRANCE KEY EXIT KEY Version Check Front ‘Stop’ + Remote Control Key ‘ ’ for 5 s Remote Control Key ‘ ’ for 1.5 s EEPROM Initial Auto Exit Front ‘Stop’ + Remote Control Key ‘ ’...
SERVICE INFORMATION FOR EEPROM POWER ON It is possible at any function. (ex. It is possible at VFD “NO USB” status, too.) VFD “NO DISC” status This is an example. Front ‘Stop’ + Remote control ‘ ’ DETECT NEW EEPROM push same timing during 5 s (OPTION EDIT SCREEN) NAME...
PROGRAM DOWNLOAD GUIDE 1. AUDIO PROGRAM Download program file name must be MICOM_CM8460_YYMMDDX.HEX If security program(Water Wall) is activated on PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Downloading file proceeds in the same way at USB1 function and USB2 function.
Page 10
2. CD PROGRAM Download program file name must be HG690_CM8460_YYMMDDX.bin If security program(Water Wall) is activated on PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Downloading file proceeds in the same way at USB1 function and USB2 function.
Page 11
3. EQ PROGRAM Download program file name must be EQ_PRG.BIN If security program(Water Wall) is activated on PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Downloading file proceeds in the same way at USB1 function and USB2 function.
FOTA UPDATE Step1. App Connecting Step2. Device version info After connecting the bluetooth APP with SET, When touch the “Device Version info” button, the user could fi nd the “Device Version info” user could fi nd the current and latest SET on Setting tab.
Page 13
Step5. Transfer FW Step6. FW fl ash writing After completed the download from server, After completed the download from the smart smart phone start to transfer the fi rmware to phone, the SET overwrite the fi rmware to the SET. The progress bar is displayed on fl...
SPECIFICATIONS GENERAL Power requirements Refer to the main label on the unit. Power consumption Refer to the main label on the unit. Networked standby : 0,5 W (If all network ports are activated.) Dimensions (W x H x D) Approx.
EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION NOTES) THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. SMPS MAIN FRONT_CTRL FRONT CABLE2 CABLE1...
Page 24
SECTION 3 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE ..........................3-2 1. NO POWER ............................3-2 2. NO AMP POWER ........................... 3-3 3. NO BOOTING WHEN POWER ON THE SET..................3-4 4. VFD IS NOT DISPLAYED WHEN POWER ON THE SET ..............3-5 5.
ONE POINT REPAIR GUIDE 1. NO POWER If the unit doesn’t work by no power problem, repair the set according to the following guide. 1-1. FUSE/ THERMISTOR/ BRIDGE DIODE 1-1-1. Solution Please check and replace TH900 ~ TH903, BD901 on SMPS board. 1-1-2.
ONE POINT REPAIR GUIDE 2. NO AMP POWER If the unit doesn’t work by no ±PVDD problem, repair the set according to the following guide. 2-1. FUSE/ FET 2-1-1. Solution Please check and replace F911, Q905, Q906 on SMPS board. 2-1-2.
ONE POINT REPAIR GUIDE 3. NO BOOTING WHEN POWER ON THE SET The set doesn’t work when press the power button on the FRONT board or the remote control. 3-1. IC501 3-1-1. Solution Replace IC501 on MAIN board. 3-1-2. How to troubleshoot (Countermeasure) 1) Check the 5.6 VA (CN106) and DVCC 3.3 V (IC505) in standby mode.
ONE POINT REPAIR GUIDE 4. VFD IS NOT DISPLAYED WHEN POWER ON THE SET When power on the set, any icons or characters on VFD are not displayed. 4-1. VFD (VFD301) 4-1-1. Solution Please check and replace VFD301 on FRONT board. 4-1-2.
ONE POINT REPAIR GUIDE 5. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT Audio signal output is small or not. when you power on the middle power mini system. 5-1. AMP IC (IC700 ~ IC705) 5-1-1. Solution Replace IC700 ~ IC705 on MAIN board. 5-1-2.
ONE POINT REPAIR GUIDE 6. NO POWER ON (STANDBY LED IS BLINKING) It doesn’t turn on, and blinks standby LED (RED). 6-1. AMP FETs 6-1-1. Solution Replace AMP FET on MAIN board. 6-1-2. How to troubleshoot (Countermeasure) 1) This symptom occurs, when DC protection is detected. MAIN reasons are like below. - When some of AMP FETs dead.
ONE POINT REPAIR GUIDE 7. SPEAKER NO AUDIO Speaker no audio. 7-1. AMP IC (IC700, IC701, IC705) 7-1-1. Solution Replace IC700, IC701, IC705 on MAIN board. 7-1-2. How to troubleshoot (Countermeasure) 1) Check supply voltage of AMP (CN110) & PWM signal. Normal supply voltage and signal ...
ONE POINT REPAIR GUIDE 8. NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO VOL XX CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 8-1.
Page 33
ONE POINT REPAIR GUIDE 8. NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO VOL XX CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 8-2.
Page 34
ONE POINT REPAIR GUIDE 8. NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO VOL XX CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 8-3.
Page 35
ONE POINT REPAIR GUIDE 8. NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO VOL XX CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 8-4.
Page 36
ONE POINT REPAIR GUIDE 8. NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO VOL XX CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 8-5.
ONE POINT REPAIR GUIDE 9. NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the spindle motor among them.
Page 38
ONE POINT REPAIR GUIDE 9. NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the sled motor among them. 9-2.
Page 39
ONE POINT REPAIR GUIDE 9. NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the tray open/close motor among them.
Page 40
ONE POINT REPAIR GUIDE 9. NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the laser tracking actuator. 9-4.
Page 41
ONE POINT REPAIR GUIDE 9. NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the laser focusing actuator. 9-5.
ONE POINT REPAIR GUIDE 10. NO SOUND There is no sound output in the USB function, repair the set according to the following guide. 10-1. USB FUNCTION 10-1-1. Solution Replace IC501 on MAIN board, ICA201 on FRONT board. 10-1-2. How to troubleshoot (Countermeasure) 1) Check +5 VU to FRONT board.
Page 43
ONE POINT REPAIR GUIDE 10. NO SOUND There is no sound output in the AUX function, repair the set according to the following guide. 10-2. AUX FUNCTION 10-2-1. Solution Replace IC201 on MAIN board. 10-2-2. How to troubleshoot (Countermeasure) 1) Check AUX_L/ R signals to IC201 (pin7, pin8). 2) Check if MCS_BCK, MCS_LRCK, &...
Page 44
ONE POINT REPAIR GUIDE 10. NO SOUND There is no sound output in the PORT. IN function, repair the set according to the following guide. 10-3. PORT. IN FUNCTION 10-3-1. Solution Replace IC201 on MAIN board. 10-3-2. How to troubleshoot (Countermeasure) 1) Check PT_L/ R signal from FRONT board to MAIN board.
Page 45
ONE POINT REPAIR GUIDE 10. NO SOUND There is no sound output in the TUNER function, repair the set according to the following guide. 10-4. TUNER FUNCTION 10-4-1. Solution Replace IC201, TU500 on MAIN board. 10-4-2. How to troubleshoot (Countermeasure) 1) Check if TUNER_L/R is entered from pin1 &...
Page 46
ONE POINT REPAIR GUIDE 10. NO SOUND There is no sound output in the MIC IN function, repair the set according to the following guide. 10-5. MIC IN FUNCTION 10-5-1. Solution Replace IC206 on MAIN board, IC30A1 on FRONT CONTROL board. 10-5-2.
Page 47
ONE POINT REPAIR GUIDE 10. NO SOUND There is no sound output in the Bluetooth function, repair the set according to the following guide. 10-6. BLUETOOTH FUNCTION 10-6-1. Solution Replace IC501 on the MAIN board or bluetooth module on the FRONT Panel. 10-6-2.
ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER SUPPLY ON SMPS BOARD No output 5.6 VA Replace F901 (same fuse). Is the F901 normal? Replace BD901. Is BD901 normal? Is the VCC Is D960, D961 normal? (11 V ~ 25 V) supplied to IC901 pin4? Power line of MAIN PCB is short.
Page 49
ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER SUPPLY ON SMPS BOARD No -5 V Is the Is the D967 normal? Check or replace D967. VCC -7 VA supplied to IC953 pin2? Check or replace Q951. Is there Check P_CTL ‘H’ signal at Q953 from μ-com.
Page 50
ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER SUPPLY ON SMPS BOARD No AMP output Is the Check PFC P_CTL Is the C904 voltage PFC P_CTL OK? from μ-com. about 390 V? Is the VCC 12 V supplied to Replace D908, Q955, PC903. IC904 pin16? Check or replace IC904, Q907 ~ Q910.
ELECTRICAL TROUBLESHOOTING GUIDE 2. SYSTEM PART Power on. CN605 “HELLO” cable connection Display on FLD Check FFC cable. CN605 pin7, 14, 16, 29 power Check SMPS board. CN605 pin8 ~ 10 data signal Check MAIN board. FL+/-, VDD_3.3V voltage OK? Replace VFD301.
ELECTRICAL TROUBLESHOOTING GUIDE 3. NO AUDIO CHECK CD FUNCTION Is Motor_open/ close OK? LOAD +, - OK? DISC insert? (IC400 pin6, 7) Check IC501. Is motor impedance Check loading motor. about 12 Ω? Check IC400. Focusing/ OPU driving Tracking/ Sled signal Disc reading OK? (Focusing &...
Page 53
ELECTRICAL TROUBLESHOOTING GUIDE 3. NO AUDIO CHECK USB FUNCTION When insert USB, IC312 USB Power Replace IC312. IC501 pin U7, U8, A7, A8 +5VU OK? USB_D signal OK? AUX FUNCTION IC201 Check audio cable. pin23, 24 AUX input signal IC201 Check IC501.
Page 54
ELECTRICAL TROUBLESHOOTING GUIDE 3. NO AUDIO CHECK PORTABLE FUNCTION IC201 Check FRONT board. pin9, 10 POT_IN input signal IC201 Check IC501. pin42 ~ 44 I2S input signal IC201 pin41 Replace IC201. ADC_data_IN/ SDOUT output signal OK? TUNER FUNCTION TU500 IC201 pin26, 27 TUNER_L/R output TUNER_L/R input signal Check +3.3 V of TU500.
Page 55
ELECTRICAL TROUBLESHOOTING GUIDE 3. NO AUDIO CHECK IC501 Check IC501. pin D1, D2, E1 I2S clock signal IC501 Check IC501. pin E2 I2S data signal IC202 Replace IC202. PWM data output signal 3-32...
Page 56
ELECTRICAL TROUBLESHOOTING GUIDE 3. NO AUDIO CHECK pin37 ~ 40, Pin41,42,45,46 pin47 ~ 50 of IC202, of IC202, SW1±, SW2± FL/FR/RL/RR signal signal OK? Check IC202. Check IC202. IC203, IC204 IC205 FL/FR/RL/RR signal SW1, SW2 audio signal Check IC203, IC204. Check IC205.
WAVEFORMS OF MAJOR CHECK POINT 1. DSP (IC501) X X I X X I Fig 1-1. X501 Fig 1-2. X500 Crystal of RTC 32.768 MHz Crystal of system 24 MHz (R5D6) ( MAIN DSP : R508, C503 ) 3-34...
2. SMPS BLOCK DIAGRAM MAIN SMPS IC 14 VA (STR-2A153D) Flyback MAIN OPAMP - 5 V TRANS u-com / BT 5.6 VA PFC Out USB / MPEG Motor Dirve (380 V) PFC IC (R2A20112A) 12 V FAN/LED/Mic Totem 23.8 A pole 600 V On/ Off...
DECK MECHANISM DISASSEMBLY (S1) Cover Top Clamp Assembly Clamp Assembly Plate Magnet Clamp (L1) < Figure A > < Figure B > 1. Cover Top 2. Clamp Assembly 1) Remove the 2 screws (S1). 1) Place the Clamp Assembly as Figure B. 2) Unhook the 4 Locking Tabs (L1) by using a 2) Bending the Cover Top in direction of flat-head screwdriver.
DECK MECHANISM DISASSEMBLY Emergency eject hole MD Sub (H1) Assembly Tray Disc < Bottom side view > Tray Disc < Figure D > Tray Disc 3) Grasp the both sides of the Tray Disc and lift it up as Figure D, and then pull the Tray Disc <...
DECK MECHANISM DISASSEMBLY Base Main Figure H-1 Guide Gear Loading Gear Pulley (L3) Base Main < Bottom side view > Belt Loading (L4) Deck PCB Motor < Bottom side view > Assembly < Bottom side view > Assembly Deck PCB (S3) Assembly <...