After realizing that problem was with my Power Adapter and not with Shiro modem and getting denial from my local exchange on request to replace my power adapter, I have tried 3 different adapters
i) 9V DC 500mA
ii) 9V DC 850mA
iii) 9V DC 1A (1000 mA)
and all got fried. 1000 mA fried while it was connected on WAPDA supply and other 2 when they were on UPS supply.
So after wasting money and time , I searched in this forum and found that many others like me have the same problem with Shiro adapter, and few have suggested to use BIG uglly looking transformer based adapter and few have suggested to use power supply based adapter . Even some have said to use 12V adapter ...
So here I would like to get input from you guys on these :
A) Where to find the power supply adapter and in what way it is better than transformer based adapter ?
( I am in Lahore/Model town and have searched township market and Hafeez center but could't find power supply based adapter)
To my understanding If you give 12V DC supply to 9V device it will casue damage to device, so has any one tried attaching 12V adapter to 9V DC expecting Shiro modem ?
C) Why my genuine adapter (9V 500mA ) worked for 8 months in conditions in which these 3 adapters failed ?
D) And is it possible that problem is with modem and its giving some kind of "back-voltage" to adapters ???
Thanks for your time.