Here I'll just translate the main ideas of my previous post in Russian.
The story begins when I realized that MC75's hardware is capable to work with SDHC cards. I tried several drivers for other devices, but the result was that SD card became no longer accessible. First I thought that it was purely software problem - I upgraded to WM6.1 pro. But problem persisted. As long upgrading replaced all files in FLASH - I came to idea that the problem may be hadrware. I decided to open MC75 and examine micro SD slot.
How to open MC75?
1) Turn phone and everything off.
2) Detach stylus.
3) Remove battery door completely - I mean that you should detach even door's strap. It will make further process more convenient.
4) Remove battery.
5) Unscrew 7 screws as shown by arrows.
6) Carefully pull rear part of the housing away from frontal part. Pay attention to the rubber seal. It is strong and thick and can't be damaged easily, but nevertheless :)
7) See the picture below. It explains where there is audio connector. You should disconnect it before put rear part of the housing away. The connector is not tricky - just pull it gently. Precision tweezers highly recommended.
8) Mostly malfunctioned part in electronics is mechanical contacts. You should check whether CARD DETECTION pin works correct or not. It is easy part. When card is in slot card's pin #6 (which is GND) should be shorted to CARD DETECTION pin by the card itself. Just check continuity between those pins while card inserted. If not - than you should fix the slot.
9) I recommend to remove metal frame which holds speaker, laser barcode scanner and backup battery - it will ease access to the SD slot. Unscrew screws as shown below. Notice that one of the screws is under the speaker which is glued to the frame. Tear speaker apart, disconnect it from board. You'll also need to disconnect barcode scanner's connector. Pull darker part of it upwards - it will release the ribbon cable.
10) Unsolder slot cover. I recommend hot air soldering station at 300 C and soldering iron with appropriate tip at 450 C.
11) Try not to loose mechanical parts of the slot.
12) Slightly bend slot's contacts upwards. But not to much. SD card should be able to be inserted in.
13) Re-solder slot cover. Check continuity between CARD DETECTION pin and GND while card is inserted.
14) If ok - put all parts back together. Do not forget to connect barcode scanner, speaker, antenna and audio.
15) MC75 may require a cold boot (1+9+PWR key) to turn on after removing both batteries.
16) Check how GPS, GSM, IrDA and microSD are working.
17) In case if mechanics of the SD clot is not working properly I recommend to buy a 32 Gb micro SD card, put some scotch tape on card's top side and place it into slot permanently. There are lot of ways to upload/download data from card while it is still in MC75 so there is not a big deal if you can't remove card any more.
18) I successfully fixed my problem with CARD DETECTION pin. Even more - there was absolutely no damage to other parts of MC75 - all works fine!
19) I must mention that any consequence of following instructions above is sole responsibility of the person who follows these instructions. It is MANDATORY to have spacial equipment and skills!
20) Before you take a screwdriver - think twice! :)
21) Before heating up a soldering iron - think three times! :)
22) Good luck! And may the Force be with you!
The story begins when I realized that MC75's hardware is capable to work with SDHC cards. I tried several drivers for other devices, but the result was that SD card became no longer accessible. First I thought that it was purely software problem - I upgraded to WM6.1 pro. But problem persisted. As long upgrading replaced all files in FLASH - I came to idea that the problem may be hadrware. I decided to open MC75 and examine micro SD slot.
How to open MC75?
1) Turn phone and everything off.
2) Detach stylus.
3) Remove battery door completely - I mean that you should detach even door's strap. It will make further process more convenient.
4) Remove battery.
5) Unscrew 7 screws as shown by arrows.
7) See the picture below. It explains where there is audio connector. You should disconnect it before put rear part of the housing away. The connector is not tricky - just pull it gently. Precision tweezers highly recommended.
9) I recommend to remove metal frame which holds speaker, laser barcode scanner and backup battery - it will ease access to the SD slot. Unscrew screws as shown below. Notice that one of the screws is under the speaker which is glued to the frame. Tear speaker apart, disconnect it from board. You'll also need to disconnect barcode scanner's connector. Pull darker part of it upwards - it will release the ribbon cable.
11) Try not to loose mechanical parts of the slot.
12) Slightly bend slot's contacts upwards. But not to much. SD card should be able to be inserted in.
13) Re-solder slot cover. Check continuity between CARD DETECTION pin and GND while card is inserted.
14) If ok - put all parts back together. Do not forget to connect barcode scanner, speaker, antenna and audio.
15) MC75 may require a cold boot (1+9+PWR key) to turn on after removing both batteries.
16) Check how GPS, GSM, IrDA and microSD are working.
17) In case if mechanics of the SD clot is not working properly I recommend to buy a 32 Gb micro SD card, put some scotch tape on card's top side and place it into slot permanently. There are lot of ways to upload/download data from card while it is still in MC75 so there is not a big deal if you can't remove card any more.
18) I successfully fixed my problem with CARD DETECTION pin. Even more - there was absolutely no damage to other parts of MC75 - all works fine!
19) I must mention that any consequence of following instructions above is sole responsibility of the person who follows these instructions. It is MANDATORY to have spacial equipment and skills!
20) Before you take a screwdriver - think twice! :)
21) Before heating up a soldering iron - think three times! :)
22) Good luck! And may the Force be with you!
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