Toshiba-MEGF20-hddap-sm 电路图 维修手册.pdf

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1、HDD AUDIO PLAYER SERVICE MANUAL MEGF60,MEGF40 MEGF20,MEGF10 (UK) FILE NO. 400-200503 Jun., 2005? (MEGF60) RadioFans.CN 收音机爱 好者资料库 Precautions Safety Precautions for Service This section provides critical information for safety. Be sure to observe the content. Meaning of each indication is as follows

2、: WARNING Death or serious injury may be caused to service personnel and/or surrounding people or users due to incorrect work by neglecting the following instructions or due to resulting defects of the product. CAUTION Injury or physical damage* may be caused to service personnel and/or surrounding

3、people or users due to incorrect work by neglecting the following instructions or due to resulting 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)

4、 that does not need power supply. Otherwise, it may cause electric shock. ?Use an insulation transformer and/or wear protective gloves when power is ON, and unplug the power cable when replacing parts to avoid electric shock. ?Use specified spare parts of the product for replacement. Since some part

5、s have safety characteristics (fire resistance, withstand voltage, etc.), use replacement parts with 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

6、and securely reconnect cables as they were. For safety reasons, some insulating materials such as tubes and tapes are used, and some parts are mounted with 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

7、means. When reassembling/reconnecting these parts, put them as they were. Do not catch the internal cables by the cabinet or cover. Improper assembling or cable connection may cause electric leak or fire, which may lead to an accident on the user side. ?After repair work is completed, unplug the pow

8、er cable, and measure the insulation resistance between the external metal portion and plug blade with a 500V megger. The resistance shall be 1M ohms 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 malf

9、unction or failures, which may lead to an accident such as electric leak 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 buil

10、t-in battery The gigabeat uses a built-in rechargeable lithium-ion battery. Follow the government regulations when discarding the battery. Precautions for built-in hard disk This product has a built-in hard disk. If the disk is subjected to impact, vibration or change in the environment, such as tem

11、perature change, it may result in damage to the unit, malfunction 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 to high temperatures. Do not p

12、lace the product in a place where it will be subject to extremely 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 f

13、ield. Do not place the product where it will be subject to 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 th

14、e product. Do not subject the product to vibration or impact, or swing it around or drop it, regardless of whether or not the product 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 th

15、e internal hard disk. Inform users that hard disk data may 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 standin

16、g HDD falls down. RadioFans.CN 收音机爱 好者资料库 CONTENTS 1. Product overview . 2 1.1. Product outline . 2 2. Block diagram.5 2.1. Logic circuit block diagram . 5 2.2. Power circuit block diagram . 6 3. Cautions on repair .7 3.1. Tell the owner that the contents of the HDD may be erased. . 7 3.2. Remov e t

17、he AC adaptor and set the BATTERY switch to OFF. 7 3.3. When replacing the HDD . 8 3.4. When replacing the main board . 22 3.5. Replacing the base . 24 3.6. Replacing the frame. 25 3.7. Replacing the LCD and LCD backlight unit . 26 3.8. Replacing the lithium - ion battery . 27 3.9. Replacing the cra

18、dle . 27 4. Troubleshooting.28 4.1. Anticipated defects. 28 4.2. Defect analysis procedure as a maintenance serv ice . 29 5. Procedure to conf irm the f irmware version .36 6. About the version of f irmware.36 7. Disassembling/ Reassembling Procedures .37 7.1. Disassembling Procedures . 38 7.2. Reas

19、sembling Procedures. 42 8. Exploded view .45 9. Parts List .46 Specif ications 1 ? 2? 1. Product overview The Toshiba 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.

20、The main features are as follows: - A positive touch sensor, Plus TouchTM, interlocks with the Operation Guide displayed 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 aud

21、io data with a photo in the jacket, you can select a song while looking at the photos in the jacket. - With gigabeat 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 cap

22、acity ranges widely from 10 to 60GB. - The unit is compatible with SRS WOW. - A built-in lithium ion rechargeable battery 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 come

23、s with a Line Out terminal. 1.1. Product outline 1.1.1. Internal composition The gigabeat F series consists of the following 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

24、 an ordinary external HDD, this HDD can store Word and other non-musical files. - TFT color liquid crystal display - 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 ai

25、r. This keeps it resistant to impact and vibration. ? 3? 1.1.2. Accessories The product is furnished with main accessories 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 cradl

26、e Placing the unit on the cradle will start recharging. The cradle has a USB Mini-B connector and can connect the unit 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 fas

27、t data transfer with USB 2.0. - Wired remote controller (optional for some models) It is connected to the headphone terminal 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 whethe

28、r there is a wired remote controller) It is a pair of inner-ear type 16? stereo headphones. The models furnished with 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

29、 This software runs on a PC, including TOSHIBA gigabeat room. - Owners manual 1.1.3. Place for storing firmware Firmware 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

30、 therefore does not allow it to be seen on the Explorer. However, reconfiguring the Explorer will enable it to be displayed. 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 t

31、he PC. This method of recovery with backup is described in the owners manual. 1.1.4. Encryption Transfer (copy) musical 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

32、format (Toshibas unique format) to prevent reproduction of a reproduction. Encryption is HDD dependent. For that reason, 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 a

33、nother HDD. If the HDD was replaced at the time of a repair, the encrypted musical data (a file with an extension .SAT) 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

34、musical data (WAV) stored on the HDD. The CPU reads the compressed musical data (WMA/MP3) from the HDD and stores it on 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) con

35、tains a large amount. When such data is handled, therefore, the HDD is always kept on. The CPU restores compressed musical 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

36、analog format and outputs it to the headphones. The CPU sets the volume control and equalizer levels on the DAC, which controls 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 C

37、ypress AT2+ forms a bridge between the USB and HDD. The PC recognizes the unit as a USB mass storage device (a USB large-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 v

38、ia USB. The Cypress AT2+ writes the encrypted data onto the HDD according to the instructions issued by the PC. ? 5? 2. Block diagram 2.1. Logic circuit block diagram ? ? ? ?!? ? #$ ? #%? $? ?4?%?0+?%3 4?*? /?2? ? ?7?=/? ?4 ?#? ?45?+?C08?+3 ?!?(?08?+)?3?%?% ?(?08?+3 #%?4%$I?J ?2? ?,$,?$ ?2? 9$,99?89

39、? 89? 1 5 2 2 2 1 2 2 3 2 2 1 1 2 3 4 -%?/? ? *$8 ? ?!1? #-$ *$8 ?%,?$ ? ,? ? %?0+?%3 +?%?%$,-08?+3 %?+0+?%3 ?0+?%3 1 1 1 ? ) ? 9?CC? 08?+3 ?9?CC08?+3 :;? /?67? ?4 :$+?-$? F? ?4 ? # % % + $ ? 4 ?9+9H ?$+9?#%?08?+3 ? 2 ? % 1 %?%? C?$?!? %?F? 1 5 13 8?+ 8?+ ?%? ? -? 0-C#3 #-$ 8?+ ?4-8,?%$#%08?+3 ,9?, 08?+3 ?0?3 ?!?. ?!? ?!? ?!?F?08?+3 ?+9?#%?2? ?,$,?$ 1 D!?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 o