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MT841 Wireless Adapter Problem

  1. #1
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    Default MT841 Wireless Adapter Problem

    Hello all,
    I have a Huawei Mt841 modem with a wireless adapter for wi-fi...
    Now, i have been using this modem for about 2 years and although the performance hasn't been very good but still things were O.K..
    but recently i discovered that i was unable to use the WLAN feature i.e., any of my wi-fi enabled devices (MY PSP or laptop were unable to detect the access point....)
    I tried to find out the reason and found that the problem was with the wireless adapter...
    On pressing the wireless adapter downwards while its inserted into the modem with considerable force the WLAN is enabled and my Laptop and PSP are able to detect the access point and even connect to it....
    And it functions normally...
    But again, the moment i relieve the pressure or the force, my psp or laptop is unable to detect it...
    PLZ HELP ME GUYS!!

  2. #2
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    Probably "High resistance contacts"
    Blackened color/ Oxidization etc.
    I don't know the cleaning liquid for this.
    try to make the contacts bright and try again.

    You are lucky the wifi adapter for the modem still works. Very difficult to get it now.
    Else you have to get new 3 in one wifi Model for Rs 1600/= from Bsnl ( plus Taxes of course !!!). WCBG03H PCMCIA Wireless adapter

  3. #3
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    Are u talkin abt the connections on the adpter's side or on the modem's side?

  4. #4
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    You insert a PCMCIA WLAN card in the modem.

    This is equivalent to making the MT841 to a 3 in One unit
    Adsl Modem Lanport and wifi router.
    You can clean the contacts of this unit only.
    Remove it and inspect the contacts.
    Wait.
    See the picture.
    http://www.calcutta.bsnl.co.in/datao...all/mdm07.html

  5. #5
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    OKay, mate..
    I'll try to clean the contacts on the adapter and then will inform u...

  6. #6
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    hello!!
    Its been a while since I replied...
    Having to use the WLan Adapter after a long time....
    Still the same problem... Tried to clean the thing.. NOT WORKING!!!
    HELP!!!

  7. #7
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    summary:
    You are lucky the wifi adapter for the modem still works. Very difficult to get it now.
    Else you have to get new 3 in one wifi Model for Rs 1800/= from Bsnl ( plus Taxes of course !!!).
    WCBG03H PCMCIA Wireless adapter
    Check prices in ebay.in for a wifi router. to use with MT 841.

  8. #8
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    one thing I would like to say is that I put the card into the modem after a few failed attempts...
    and since then its working fine even after the restarts...!
    so i am keeping the card in the modem for now at least....
    another thing is that the power adapter is broken on the modem-side port....
    the pin on the adapter which goes into the modem is broken...
    so the power is ON only when the modem is kept in a few specific angles...
    a slght movement in the modem's body causes to modem to go OFF...
    Could this bear a relation with the modem's functioning and this problem???

  9. #9
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    Try to change the cable from power adapter to modem, or
    buy a new equivalent adapter. Observe Polarity if (D.C output )
    can be 230 V A.C ~ input Output 12 V A.C or D.C= 1 Amp. May cost Rs 150/=
    Delhi makes will be marked Rs 250/=

    The D.C ( or A.C) input plug ( approx Rs 10/=) to the modem power input socket
    can be replaced. Due to frequent use the contacts could have been oxidised.
    Inspect the ends. If still problem input port contacts also could be intermittent.
    Radio/TV repairman may charge Rs 100 minimum to repair the power plug and cable !

  10. #10
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    thanks... i'll get it repaired and let u know soon..

  11. #11
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    Quote Originally Posted by nims11 View Post
    one thing I would like to say is that I put the card into the modem after a few failed attempts...
    and since then its working fine even after the restarts...!
    so i am keeping the card in the modem for now at least....
    another thing is that the power adapter is broken on the modem-side port....
    the pin on the adapter which goes into the modem is broken...
    so the power is ON only when the modem is kept in a few specific angles...
    a slight movement in the modem's body causes to modem to go OFF...
    Could this bear a relation with the modem's functioning and this problem???
    I saw the internal design of MT841, there is a bridge rectifier as the supply is fed in. so even DC would go through. You may pay around Rs250 to 300 and purchase one 12V DC, 1 A smps adopter. It works well. for that price you get both Indian and chin ease make smps adopters. as it would be light weight helps not to break.

  12. #12
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    If there is a bridge rectifier inside the modem ,
    The out put will be 12 V A.C ~ from the original adapter.
    Polarity of the D.C plug won't be shown on the cover of the adapter.
    will wait for feedback.
    one model:
    Huwaei MT841 power requirements are 12 V ~ 1200mA
    Replacement adapter will be cheaper.

  13. #13
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    Quote Originally Posted by essbebe View Post
    If there is a bridge rectifier inside the modem ,
    The out put will be 12 V A.C ~ from the original adapter.
    Polarity of the D.C plug won't be shown on the cover of the adapter.
    will wait for feedback.
    one model:
    Huwaei MT841 power requirements are 12 V ~ 1200mA
    Replacement adapter will be cheaper.
    hi, the output of rectified DC if 12V AC is supplied, would be 15.4V DC[Vac*(sqr(2) -1.4V being drop across 2 diodes.] approx under no load and would fall to 13V DC or so under load.
    Now if we supply 12V DC from outside, irrespective of polarity( bridge acts as polarity guard)the output would be 10.6V DC.
    this is too small as finally we get it converted to 5V DC inside.

    I tried this MT841 even with 9V DC and it works well.

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