Question about NEC MobilePro 900 Handheld

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Critical error 678

I have a critical error 678 in my nec mobilepro 900 when connect the usb to my pc.
thank you for help to me

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Re: critical error 678

Plug usb connector into back of computer (not front)-worked for me.

Posted on Jun 20, 2008

Re: critical error 678

Plug usb into back of computer (instead of using front port). This fixed the problem for me.

Posted on Jun 20, 2008

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Re: critical error 678

1) make sure you have the latest active sync installed

C:\Program Files\Microsoft ActiveSync\drivers
c:\windows\system32\drivers....with activesync 3.7 anyways.
2) go to contro panel -> system -> device manager -> view device b
connection -> plug and play bios -> pci bus -> usb host controller -usb root hub
3)delete everything uner usb root hub.
4)from control panel run add new hardware
5)now everything under your computer's usb hub including the cradl
will be installed properly.
6)once this installation is performed, you will make sure to see "H
USB Sync 1620" under USB root hub

Posted on Jan 17, 2008

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I cannot get my nec mobile pro 900 to sync with my laptop i downloaded activesync from: i downloaded...

Which one did you do first: Did you install ActiveSync 4.5 first, or did you try installing the driver first?

The best way to do this is as follows:

  1. Download and install ActiveSync (4.5 is what i use both at home and work and it works great with the NEC 900 and 900C's.
  2. Restart your Windows XP Machine (I assume you don't have Vista)
  3. Next, follow the instructions for the installing the NEC 900 usb drivers (these drivers should be installed AFTER installing ActiveSync... (it seems to work that way without problems for me).
  4. Next, restart your xp machine again.
  5. Now, connect your NEC MobilePro 900 to your Windows XP machine, and it should perform smoothly.
If this does not work for you, you can contact the folks at, they sell and repair, as well as provide support for these machines.

Hope this helps

Apr 17, 2009 | NEC MobilePro 900 Handheld

1 Answer

Syncing my MobilePro 790 with my computer

yes...quite an issue, eh? what is the actual model and make of that device?

Mar 20, 2008 | NEC MobilePro 790 Pocket PC

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Critical error 678 on mobilepro 790

error code is 678 means Ur com port not correct configure so before u connect anything u must to configure correct.

Mar 02, 2009 | NEC MobilePro 790 Pocket PC

1 Answer

NEC Mobilepro 900c will not connect w/computer

Are you using the NEC Mobilepro 900c drivers? I'm sure the drivers are different. YOu can find the XP drivers here: In addition, you should make sure that you have Activesync 3.8 or older. You can find it here:

Dec 25, 2007 | NEC MobilePro 900c Pocket PC

1 Answer

Mobilepro 900c won't sync

I'm having the same problem. Sorry man. I'll let you know if I find something out!

Nov 23, 2007 | NEC MobilePro 900 Handheld

1 Answer

Error message "Backup Battery Very Low"

The MobilePro 900 back up battery is low and should be replaced. The battery is a CR2032 coin-cell battery, which is very common and can be purchased at most department and drug stores. Refer to section 1-7 of the "MobilePro 900 Handheld PC's User's Guide" for detailed replacement instructions.

Sep 14, 2005 | NEC MobilePro 900 Handheld

1 Answer

32-bit card bus PCMCIA

No. The MobilePro 900 PCMCIA slot only supports 16-bit PCMCIA (PC Card) cards.

Sep 14, 2005 | NEC MobilePro 900 Handheld

1 Answer

Obtain the USB drivers

You can obtain them from the Apps and Driver CD that was shipped with the device or download them here: Windows XP USB: Windows 2000 USB:

Sep 14, 2005 | NEC MobilePro 900 Handheld

1 Answer

Hard reset

Note: It may be necessary to depress the power button more than once to properly initialize the power management circuitry before the unit comes on. Note: It may be necessary to connect AC power to the unit and allow it to charge before attempting to apply power. The unit will not power up if the battery voltage is below a safe operating level. Please refer to the leaflet "NEC MobilePro 900, Performing a Hard Reset" that was shipped with the unit for the procedure to perform a hard reset on your MobilePro 900.

Sep 14, 2005 | NEC MobilePro 900 Handheld

1 Answer

Jack for the external microphone

There is an error in the MobilePro 900 manual (Pages 2-2 and 2-3). The jack on the front of the MobilePro 900 is a stereo headphone jack only. The MobilePro 900 has a built in microphone. There is no jack for attaching an external microphone.

Sep 14, 2005 | NEC MobilePro 900 Handheld

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