A1WX Transformer specs.

By SVeN

Rookie (21)

SVeN's picture

03-05-2004, 23:38

Hi,

As I've plugged my A1WX on 200V instead of 100V (ouch !),I've crashed my tansformer.
I cannot find any specification to replace this 4-pins transformer.

Can anyone please give me the 4-pins out-voltage of this transformer ?

Thanks in advance.

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By flyguille

Prophet (3028)

flyguille's picture

04-05-2004, 02:09

a good electronic technical will to know that.

seeing the size, and metal you can determined the WATTS value
seeing the circuit where it is mounted you can determined the Volt outputs
and you say, the volts input is 100V

Normally the outputs volts are 5V (8V without load) and 12V (16V without load).
Some transformers got 3 pins for the 12v or 5v and 2 pins for the other, but as you say 4 pins output, surely got 2 and 2....now, you need to determinate which is which, simply looking on the circuit for the capacitors voltage value, for 12v filtering surely got a up to 16V or 25v capacitor, and for 5v can be a 10V or 16V. If still unsure, you can whath the regulator circuits looking for the zener diode or the regulator model.

Ah, don't forgot, msx also got a -12v value... well, i remember that, but not sure.

By SVeN

Rookie (21)

SVeN's picture

11-05-2004, 19:33

Hi,

Someone gave me the specs of the A1WX transformer.

IN : 110V
OUT : 4 pins
1 for the ground
2 delivering 12V
and the last delivering 15V

This transformer is impossible to find, and if I use 2 different transformers, they don't fit into the A1WX case !

So, if someone can provide such a transformer (maybe from a damaged unit) .. he can make me an offer.

Thanks for your help !

By flyguille

Prophet (3028)

flyguille's picture

11-05-2004, 20:44

you don't need a standard transformer... you need the service of a transformer-repair-man, he will to change the winding-wire.

By dhau

Paragon (1570)

dhau's picture

12-05-2004, 22:03

Hey man, I doubt any MSX requires 15 volts, I think all MSXes do use +/-5, +/-12 and ground, so you should be ok with external PC AT power supply. It's not elegant, but will work great...

By Sonic_aka_T

Enlighted (4130)

Sonic_aka_T's picture

12-05-2004, 22:28

Nope... Prolly this MSX has the voltage regulator on the mainboard. The Turbo-R has this too. I don't recall the original transformer values, but I ended up putting in a 16-0-16 V transformer in there. (or 24V, I don't really remember) The mainboard on the Turbo-R then does the actual voltage regulation. If the computer does work like that generally anything AC and reasonably within the voltage limits will do. It does sound odd that not both pins supply the same voltage though. Usually you'd have something like 12-0-12 or 15-0-15 Volts in AC. But hey... What do I know... What you need is a super hero...... Repair-Bas, HELP ME!!! (he has super hearing and can hear any cry on a forum)

By Sonic_aka_T

Enlighted (4130)

Sonic_aka_T's picture

12-05-2004, 22:30

What fly said is a good idea also... If it's a normal AC transformer you can unwind the coil to see what the ratio was... It's a lot of work though Tongue

By SVeN

Rookie (21)

SVeN's picture

14-05-2004, 12:47

The A1WX mainbord has 2 voltage regulators :

- 78L12 +12V VOLTAGE REGULATOR
- 79L12 -12V VOLTAGE REGULATOR
(both in TO-92 case)

I cannot figure where the out-15V is regulated (but there are some elements without any reference, and I'm not an electronic specialist ... ough).

By the way, the msx unit works well with two transformers (2x12v & 2x15v AC-output), as described above.

I'll hope to find someone who is able to repair such an atypical transformer ... Thanks again for your help.

By dhau

Paragon (1570)

dhau's picture

14-05-2004, 17:38

What fly said is a good idea also... If it's a normal AC transformer you can unwind the coil to see what the ratio was... It's a lot of work though Tongue

Or let the professional do it for you, just tell him the power consumption of your computer (probably around 30Watt, make it 60 just to be sure it can handle all the carts you slap into your slot extender). He will rebuild your transformer.

Actually it's better this way, because original transformer was expecting ~100 Volt input, and you probably have 110 or 220

By dhau

Paragon (1570)

dhau's picture

15-05-2004, 21:25

... I might decide to move my A1WSX to PC AT case. If I'm going to do this, I can sell you my transformator. It's in great shape.

By Sonic_aka_T

Enlighted (4130)

Sonic_aka_T's picture

15-05-2004, 21:54

I'll hope to find someone who is able to repair such an atypical transformer ... Thanks again for your help.
This one is a bit risky, but usually works... Try maybe going up a little from the original 15V. Although it is a little bit risky, it will usually work. Try looking for the big caps on the motherboard and find out what their voltage limitation is. They're probably more than 15V. You can *normally* safely assume that you can put in at least 80% of the voltage of whatever it says on the caps. My >>> GUESS <<< is that it shouldn't be much of a problem to go as high as 18 or maybe even 20 volts. Note that this is an uneducated guess. I did work on my Turbo-R though. I remember it was handling a lot more than the original transformer supplied. But then again it already was before since I was putting about 115V in instead of 100V due to my cheap travel adaptor...