Introduction - New Amiga owner

[ferix]

Wellcome mate!!!

What colout is It? Green?
The switch could be for deactivate the memory expansion, so if It's broken, It could generate a memory error, and It's reflected with a green screen.
Of course, that error could be generated by other causes, like a faulty chip, a bad seated chip, etc...
There are more error colour codes, like grey for a rom problem, so let us know the colour to help you.

The complete error colour code:

Red: Bad ROM
Yellow: CPU Exception before bootstrap code is loaded (faulty CPU).
Green: Bad Chip Ram or Agnus, or any support chip (74LS245, Gary chip... etc.).
Black: No CPU (ouch!!!).
White: No error.
Grey: CPU passed.

PD.: I'm spanish too, I got a speccy 16k too, and I'm 32... Are you from the other side of the mirror???

Saludos.

Edit:
Corrected a mistake and expanded with the general colour codes.

[ferix]

I think the switch is for deactivate the internal expansion. Some old (very old) games doesn't work with the expansion attached.
The green screen error could be generated by a bad seated chip, so open your amiga an push on every chip, and try again.

[ferix]

- I can see corrosion in the battery
 
I am going to ask for a solder to fix the cables but I think the computer is going to work only without the expansion... Is it easy to get and replace that battery or maybe I should look for a new expansion card?

First, try to boot without the expansion card. If It boots, then take a look at the memory expansion. Some tracks on the pcb could be damaged by the battery leak, so they will need to be repaired.

P.D.:
I forgot It. I'm from La Coruña.

[ferix]

Hey, don't give up!!!
I'll help you to fix your amiga.
In the worst case, you can send It to me.
I'll repair It for you, for free, of course. You only pay the shipment and the spare parts.
But first, try to do It yourself.
First of all, carefully lift up all the socketed chips, and reseat them.
Ok, Agnus needs a special tool to be extracted, but you can get It for 4 euros or less.
(http://todoelectronica.com/extractor-integrados-plcc-p-7376.html)
If you need more tips, please tell me. You can send me a PM. I'll answer you... in spanish

[ferix]

Green screen can be as result of a bad ram chip too, so try this:
Turn on the computer, and wait for all chips to become warm.
Now, touch every ram chip, and if one of them is too hot, probably It's a faulty chip...

[ferix]

Ok, now I see what is happening.
This wiring is for changing the mapping of the expansion board, from chip to fast.
Now I'm at work, so I can't check It, but what you need is to join the center pin of JP2 with one of the others, but only one, not both.
At first, we will try to boot without the expansion board.
As soon as I can confirm the original position I'll tell you.