T22 power jack question.

[wurgle]

Hi all



The power supply switch on the ac adapter inadvertantly was switched to full wattage and now of course my T22 won't start up via the power cord.
However, it powers up via the vestiges of battery power I have so I know the laptop isn't fried.


My question is if I buy an IBM power jack and clip it in would this in all probability fix the laptop allowing me to use the ac adapter again (with proper voltage selected of course!)



Cheers.

[rkawakami]

Welcome to thinkpads.com!

It appears you tried using a non-IBM AC adapter that has a switch that selects either input or output voltage, correct? There really isn't a "wattage" selection on any adapter that I know of. You can either select the input voltage (110VAC in the US and 220VAC most everywhere else) or the output voltage (T2x systems use 16VDC) on some AC adapters. If you tried using an adapter that was set at 110V input in the UK, then you possibly fried the adapter or the laptop. Using a genuine IBM adapter is safe since they are designed to accept either 110V or 220V without any switch changes.

Again, assuming you plugged in the adpater set for 110V into your 220V mains, the resulting output voltage may have been greater than the 16VDC the laptop needs. That could have blown the main input fuse (located on the motherboard next to where the DC jack plugs in). It may have also damaged some of the other power conditioning components related to the DC input. The battery inputs are protected by other fuses (main battery and the Ultrabay). You definitely should get an IBM adapter.

(ref: Domestic AC power)

[wurgle]

Thanks for the reply..

Yes, i assume the adapter (non ibm) was set to 30vdc or something similar.
My bet is the fuse you mentioned has blown hence no power when connected to the ac adapter.
Are these fuses easy to replace? Would getting another power jack be of any use?

Thanks again.

[rkawakami]

The main fuse is of a "surface mount" type. For an example, you can see one that's on a T23 motherboard here:

http://www.rkawakami.net/ibm_t2x/let.jpg

If you look at the top edge of the photo you should see "F2". That's the main fuse next to the jack that the DC plug connects to. It looks like a clear plastic chip with copper-colored ends. I doubt that there's any actual damage to the plug itself. Most likely the fuse blew OR some other component on the motherboard went "poof".

Locating one of those fuses can be a problem. However, I replaced one of these fuses before:

http://forum.thinkpads.com/viewtopic.ph ... 118#204118

Not sure if the T22 uses the same exact fuse, but places like Mouser.com and DigiKey.com (both in the US) usually have a good stock of these components. If I have some free time, I'll pull the keyboard off my T22 and see if I can determine a part number. You would then have to search for an electronics parts distributor in your part of the world that stocks the part and is willing to sell you a single one. The alternative is to buy a "parts" system and cannibalize it for spare parts.

A low wattage solder iron (about 25W), steady hands, and good eyes can allow you to remove/replace the fuse.

[wurgle]

Thanks very much for the time and effort in replying to my questions..much appreciated.
Sounds like something must have gone "poof" as you say..i will disassemble and have a gander at the motherboard over the weekend. Parts will probably be very hard to find over here though.(England)

Cheers again.