Toshiba-MEGF20-hddap-sm 维修电路原理图.pdf

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1、HDD AUDIO PLAYERSERVICE MANUALMEGF60,MEGF40MEGF20,MEGF10(UK)FILE NO. 400-200503Jun., 2005?(MEGF60)RadioFans.CN 收音机爱 好者资料库PrecautionsSafety Precautions for ServiceThis section provides critical information for safety. Be sure to observe the content.Meaning of each indication is as follows:WARNINGDeat

2、h or serious injury may be caused to service personnel and/or surrounding peopleor users due to incorrect work by neglecting the following instructions or due toresulting defects of the product.CAUTIONInjury or physical damage* may be caused to service personnel and/or surroundingpeople or users due

3、 to incorrect work by neglecting the following instructions or due toresulting defects of the product.* Physical damage includes damage to buildings, household goods, properties, livestock, and pets.WARNING?Unplug the power cable before starting work (for example, disassembly) that does not need pow

4、ersupply.Otherwise, it may cause electric shock.?Use an insulation transformer and/or wear protective gloves when power is ON, and unplug the powercable when replacing parts to avoid electric shock.?Use specified spare parts of the product for replacement.Since some parts have safety characteristics

5、 (fire resistance, withstand voltage, etc.), use replacement partswith same characteristics.For safety-sensitive parts specified by marking in circuit diagrams or parts lists, use specified parts.?After repair work is completed, properly reassemble disassembled parts and securely reconnectcables as

6、they were.For safety reasons, some insulating materials such as tubes and tapes are used, and some parts are mountedwith a gap from the board surface. Furthermore, internal wiring is kept away from heating parts or high-voltage parts by using clampers or by other means. When reassembling/reconnectin

7、g these parts, put them asthey were.Do not catch the internal cables by the cabinet or cover. Improper assembling or cable connection may causeelectric leak or fire, which may lead to an accident on the user side.?After repair work is completed, unplug the power cable, and measure the insulation res

8、istancebetween the external metal portion and plug blade with a 500V megger. The resistance shall be 1Mohms or more.If the resistance is lower than 1M ohms, inspect and rectify the product.?Do not alter the product.Alteration of the product may cause malfunction or failures, which may lead to an acc

9、ident such as electricleak or fire on the user side.?Advise users to keep children away from the on-site work area.Children in the work area may be injured by tools, disassembled product or parts.RadioFans.CN 收音机爱 好者资料库Precautions for discarding built-in batteryThe gigabeat uses a built-in rechargea

10、ble lithium-ion battery.Follow the government regulations when discarding the battery.Precautions for built-in hard diskThis product has a built-in hard disk. If the disk is subjected to impact, vibration or change in the environment, suchas temperature change, it may result in damage to the unit, m

11、alfunction and/or data loss. When using this product,pay attention to the following instructions: Do not place the product under direct sunlight, in a closed car, near a heater or where the product will be subject tohigh temperatures. Do not place the product in a place where it will be subject to e

12、xtremely low temperatures. Do not subject the product to sudden changes in temperature as condensation may occur. Do not use the product in a thunderstorm. Do not place the product near a magnet, speaker or other object generating a magnetic field. Do not place the product where it will be subject t

13、o strong vibrations. Do not place or drop an object on the product. Do not place the product where it will be exposed to water or high humidity. Do not place a cup or other container of liquid near the product since spilled liquid may enter the product. Do not subject the product to vibration or imp

14、act, or swing it around or drop it, regardless of whether or not theproduct is operating. Do not forcibly push, squeeze or twist the product. Do not turn off the power or disconnect the USB cable while data is being written to or read from the internal harddisk. Inform users that hard disk data may

15、be lost when HDD is replaced or formatted, and advise them to back up“important data” before taking their HDDs for repair. Do not impact on the HDD.An impact exceeding the specified allowable value is generated even if a vertically standing HDD falls down.CONTENTS1. Product overview . 21.1. Product

16、outline . 22. Block diagram.52.1. Logic circuit block diagram . 52.2. Power circuit block diagram . 63. Cautions on repair .73.1. Tell the owner that the contents of the HDD may be erased. . 73.2. Remov e the AC adaptor and set the BATTERY switch to OFF. 73.3. When replacing the HDD . 83.4. When rep

17、lacing the main board . 223.5. Replacing the base . 243.6. Replacing the frame. 253.7. Replacing the LCD and LCD backlight unit . 263.8. Replacing the lithium - ion battery . 273.9. Replacing the cradle . 274. Troubleshooting.284.1. Anticipated defects. 284.2. Defect analysis procedure as a maintena

18、nce serv ice . 295. Procedure to conf irm the f irmware version .366. About the version of f irmware.367. Disassembling/ Reassembling Procedures .377.1. Disassembling Procedures . 387.2. Reassembling Procedures. 428. Exploded view .459. Parts List .46Specif ications1?2?1. Product overview The Toshib

19、a HDD Audio Player gigabeat F Series is a family of portable audio players incorporating a built-in HDD of 10 to 60GB. F40 and F60 are thick because the HDD they incorporate is thick. The main features are as follows: - A positive touch sensor, Plus TouchTM, interlocks with the Operation Guide displ

20、ayed on the screen to allow you operate the unit without thinking hard. - The unit comes with a 2.2 QVGA low-temperature polysilicon TFT color liquid crystal display. If you relate audio data with a photo in the jacket, you can select a song while looking at the photos in the jacket. - With gigabeat

21、 room, which is software furnished with the unit, you can take in music CDs and can automatically obtain titles and artist names from the Internet, according to the CDDB. - The HDD capacity ranges widely from 10 to 60GB. - The unit is compatible with SRS WOW. - A built-in lithium ion rechargeable ba

22、ttery enables playback for about 16 consecutive hours. - The unit is compatible with a USB cradle, enables transfer of music CDs with a single press of the RipRec button, and also comes with a Line Out terminal. 1.1. Product outline 1.1.1. Internal composition The gigabeat F series consists of the f

23、ollowing main components: - Main board The FlashROM on the main board incorporates part of the firmware. - HDD It stores encrypted musical data. The GBSYSTEM folder stores firmware. As an ordinary external HDD, this HDD can store Word and other non-musical files. - TFT color liquid crystal display -

24、 White LED backlight - Battery - Switches Cross-type feather touch sensor Pushbuttons and blue LED on the side - Cabinet parts The HDD is covered with special rubber and held in the air. This keeps it resistant to impact and vibration. ?3?1.1.2. Accessories The product is furnished with main accesso

25、ries as follows: - AC adaptor This AC adaptor is compatible worldwide (with inputs 100 to 240V AC) having a 5V 3A DC output. - Power cord (which varies with destinations) - USB cradle Placing the unit on the cradle will start recharging. The cradle has a USB Mini-B connector and can connect the unit

26、 to a PC. It has a Line Out terminal (3.5mm dia. stereo jack). It comes with a USB and a Line Out switch. It has a RipRec and a Sync button. - USB cable The cable is designed for fast data transfer with USB 2.0. - Wired remote controller (optional for some models) It is connected to the headphone te

27、rminal of the unit. The remote controller comes with a headphone terminal, which receives a pair of headphones. - Headphones (whose cord length and plug type vary according to whether there is a wired remote controller) It is a pair of inner-ear type 16? stereo headphones. The models furnished with

28、the wired remote controller have a short cord and a straight plug. The models not furnished with a wired remote controller have a long cord and a right-angles plug. - Software CD-ROM This software runs on a PC, including TOSHIBA gigabeat room. - Owners manual 1.1.3. Place for storing firmware Firmwa

29、re is stored on FlashROM and HDD on the main board. The GBSYSTEM folder on the HDD stores the firmware. The GBSYSTEM folder comes with the SYSTEM and HIDDEN attributes. Connecting it therefore does not allow it to be seen on the Explorer. However, reconfiguring the Explorer will enable it to be disp

30、layed. In case the user deletes the GBSYSTEM folder by mistake, the gigabeat room creates a backup copy of the GBSYSTEM folder in the PC the first time the gigabeat is connected to the PC. This method of recovery with backup is described in the owners manual. 1.1.4. Encryption Transfer (copy) musica

31、l data (WMA/MP3/WAV format) stored in the PC to the HDD by using a PC application, TOSHIBA gigabeat room. This transfer is possible via USB. Data transferred is encrypted in the SAT format (Toshibas unique format) to prevent reproduction of a reproduction. Encryption is HDD dependent. For that reaso

32、n, if you move encrypted musical data to the PC and write it back into the same HDD, then the data can be played back. However, it cannot be played back if the data was copied onto another HDD. If the HDD was replaced at the time of a repair, the encrypted musical data (a file with an extension .SAT

33、) cannot be played back even if written into the new HDD. ?4?1.1.5. How music is played back This section explains how the unit plays back compressed musical data (WMA/MP3) or PCM musical data (WAV) stored on the HDD. The CPU reads the compressed musical data (WMA/MP3) from the HDD and stores it on

34、the SDRAM. The CPU accesses the HDD every few minutes and accumulates the data on the SDRAM. If the HDD is not used, the HDD is turned off to save power. PCM musical data (WAV) contains a large amount. When such data is handled, therefore, the HDD is always kept on. The CPU restores compressed music

35、al data on the SDRAM and converts it to PCM data. The musical data restored to PCM data is sent from the SDRAM to the DAC by the CPU. The DAC converts the sent PCM musical data to analog format and outputs it to the headphones. The CPU sets the volume control and equalizer levels on the DAC, which c

36、ontrols the volume control level and equalizer levels according to the settings made. 1.1.6. Transfer of musical data from the PC When the unit is connected to the PC by USB, the Cypress AT2+ forms a bridge between the USB and HDD. The PC recognizes the unit as a USB mass storage device (a USB large

37、-capacity storage device). Copying musical data on the PC by using the TOSHIBA gigabeat room will encrypt the data on the PC. The encrypted data will then be sent to the gigabeat via USB. The Cypress AT2+ writes the encrypted data onto the HDD according to the instructions issued by the PC. ?5?2. Bl

38、ock diagram 2.1. Logic circuit block diagram ? ?!?#$?#%?$?&?!?(?)%?% #%?*?+?+?,?-?.?/?/?0?1?2?3#%?4#?56?727?89?89?:;?4?%?0+?%34?*?/?2?&?4?,?0$+?,-34?-,?$,0?3:;?7?=/?4?#&?,?(?A?!?,?B?!?$C$?!?$?/?D?8?(/?%08?+3%?+?+?C-E8E?A?2E7E2?2E2E2E+?,?-5?#%?.?%?-?27?.?(?7.? ?C?F-?9-?.?(?7.? ?#%?$%4+?G4?/?7?8?#%?$?

39、&?FF$?H?56?7?/?:;?45?+?C08?+3?!?(?08?+)?3?%?% ?(?08?+3#%?4%$I?J?2?,$,?$?2?9$,99?89?89?1522212232211234-%?/?*$8?!1?#-$*$8?%,?$?,?%?0+?%3+?%?%$,-08?+3%?+0+?%3?0+?%3111?)?9?CC?08?+3?9?CC08?+3:;?/?67?4:$+?-$?F?4?#% +$?4?9+9H?$+9?#%?08?+3?2?% 1%?%?C?$?!?%?F?15138?+8?+?%?-?0-C#3#-$8?+?4-8,?%$#%08?+3,9?,08

40、?+3?0?3?!?.?!?!?!?F?08?+3?+9?#%?2?,$,?$1D!?F?+?08?+3?6?2.2. Power circuit block diagram ?7?3. Cautions on repair Before repairing a product of the gigabeat F series, take the following cautions: 3.1. Tell the owner that the contents of the HDD may be erased. Replacing or formatting the HDD will clea

41、r the contents of the HDD. In receiving the product from the owner, ask him or her to make backup copies of important data. 3.2. Remove the AC adaptor and set the BATTERY switch to OFF. Before disassembly, be sure to remove the AC adaptor and set the BATTERY switch to OFF. The gigabeat F series is s

42、uch that its LCD and almost all ICs are powered even if the unit is turned off, if it is powered by the AC adaptor or battery. Before conducting a repair, therefore, the AC adaptor and battery must be removed. Setting the BATTERY switch to OFF will stop the power supply from the battery, thus puttin

43、g the unit into the same state as when the battery is removed. ?8?3.3. When replacing the HDD 3.3.1. Protect the HDD from impact Note that the HDD is vulnerable to impact. Merely falling the HDD from a vertical position would give an impact exceeding the specifications. 3.3.2. Holding the HDD When h

44、olding the HDD, hold it at the following position: Do not hold it at the following position: ?9?3.3.3. Formatting the HDD and transferring and updating the firmware Replace the unformatted HDD, then format it. After the formatting, transfer the firmware to the HDD and update the firmware. Take the f

45、ollowing steps to format the HDD: 1) Connect the HDD to the gigabeat F series. 2) Start Computer Management and select Disk Management. 3) Make sure that the USB cable is connected to the PC, then connect the USB cable to the gigabeat F series. 4) Connect the AC adaptor to the gigabeat F series. 5)

46、Hold down the POWER button to turn on the gigabeat F series. 6) Wait until the PC recognizes the gigabeat F series. ?10?7) Right-click Not Initialized displayed on Computer Management. Then click Initialize Disk. 8) Confirm that Disk (in this case, Disk 1) of the gigabeat F series is checked. Then c

47、lick OK. ?11?9) Right-click Unallocated displayed on Computer Management. Then click New Partition. ?12?10) The screen displays Welcome to the New Partition Wizard. Click Next. 11) In Select Partition Type, confirm that Primary partition is selected. Then click Next. ?13?12) In Specify Partition Siz

48、e, confirm that the partition size is set to the maximum (in this case, 38139). Then click Next. (Confirm that the default is set to the maximum. Click Next.) ?14?13) In Assign Drive Letter or Path, confirm that Assign the following drive letter: is selected. Then click Next. The drive letter: may b

49、e set to any value (in this case, E:). (Confirm that the default is set to Assign the following drive letter:. Then click Next.) ?15?14) In Format Partition, select Do not format this partition. Then click Next. (The default is set to Format this partition with the following settings. Select Do not

50、format this partition. Then click Next.) ?16?15) The screen displays Completing the New Partition Wizard. Click Finish. A new partition will be created in about five seconds. 16) Execute GBFormat.exe. GBFormat.exe is in C:Program FilesTOSHIBAgigabeat room. ?17?17) Set Drive to the drive letter assig