Thread: To enjoy uninterrupted internet, take up Diploma in Electronics!

Modem model#UT300R2U
Power supply:10V dc--550mA
I had problems accessing the internet,was told that the modem is fine but I need to replace the adapter. BSNL will not help in buying an adapter since it is already past the warranty period.
As a temporary measure I started using an old adapter used for a wireless router (Fairway;5Vdc--2.5A) but after a few months the lamps in the modem would frequently turn on,turn off...
BSNL advises to use a 10Vdc--550mA adapter.I go to a shop(Mercy electronics,anna nagar,chennai) and buy the specified adapter for 290 bucks, without a warranty! When I tried to plug it in fumes start spewing from the socket with a noise like that of a short circuit...
I take it back to the vendor, but it seems to work just fine at the shop.Modem was on for a full 10 mins without any noise/fumes from the socket. I take it back home and start using the adapter, one fine morning(in a matter of 2 days) there is no power supply at all to the modem!
I take the adapter back to the vendor,he checks the volts using a meter and says adapter is just fine and says it is the modem that isnt working!!
I said that the modem was already checked by the BSNL guys and ask him for a fresh adapter.All I get to hear was, "Sorry but you'll have to pay for it as the old adapter(ONLY ONE WEEK OLD) has no warranty((. In a fit of rage, I abandon the adapter at the shop and start hunting for a good one with warranty, but returned home with a lot of ill-luck
Now there is another problem.Wherever I ask for the adapter and check it then and there with my modem,there simply seems to be no power supply at all to the modem and I get to hear "Modem is not in working condition!" Only myself and the BSNL guys know that the modem is working.
So much so I went to same Mercy electronics but at a different branch (aminjikarai, chennai) where the guy pulled out the same adapter make saying, "175 bucks"!!!!!!!!!!!!!!! and i paid more than double at the other branch((((((((((
but then since there was no supply to the modem, he said,"you can buy the modem from us,for 1200 bucks".
I come back home, all exhausted, but start fiddling around with the 5V Fairway adapter. Now browsing with intermittent breaks in the connection(a frustrating several breaks but am getting used to it).

Any comments/advice/suggestions?

Your best option is to convince someone at BSNL to give you a spare adapter. Even though out of warranty, they can give if they are really interested to help you out. Tell them you are ready to pay for that. Or simply try talking to JTO or SDE or someone humane at exchange and request help. They definitely have a spare adapter as they must have dealt a lot damaged modems. Those adapters will be lying useless there. Explain that you will need to buy a new modem if you couldn't find an adapter.

If that doesn't work, seek help of local electronics guys and tell him to do something on this.

http://www.indiabroadband.net/bsnl-b...-dc-550ma.html (Modem UT300R2U power down, dc adapter 10v dc 550ma)

Check the Device info and post details of the hardware board.


If you had used Fairway;5Vdc--2.5A appears the board needs only 5V D.C supply. My Beetel110BXI works on5V=D.C 1 Amp adapter.

PS: where do you reside in Chennai? I am in Adyar area.

Hi Essebe,meetdilip,
Have pasted the details below.all i understand is the modem model number..
taking the modem to bsnl office today. let's see

Board ID: 96338L-2M-8M
Software Version: 3.08.02.UB.01.14_1357_100807
Bootloader (CFE) Version: 1.0.37-10.1
Firmware Version: UT300R2U.0011.01
Hardware Version: UT300R2U 2.2
Model Name: UT300R2U

Thanks for your inputs..Went to the bsnl office today, the service person said both the adapter and modem are faulty.Hence I need to either buy a new modem or have the old one repaired in an electrical shop..Luckily, I had an old modem lyin at home so got it configured and bouught a 5V adapter for 150 bucks,without warranty though.
Jut I had to bunk office today.nevertheless,am happily browsing

Congrats. ...............................

Luckily, I had an old modem

If this needs 5V= D.C likely to be same as your ut300r2U!
Mention model/make/number. May be Beetel 220BXI.

Can try FW upgrade for your modem UT300R2U ( condemned by you ).

Try bridge mode for 1 - 2 days...