A1200 Component broken

[Zac67]

Wait a moment... What about this?
http://cgi.ebay.es/MURATA-CSA3-00MG-CERAMIC-RESONATOR-3MHZ-NEW-LOT-/360160624395?pt=LH_DefaultDomain_0&hash=item53db3eff0b

$10 is pretty much a rip off. I could order one of these:

http://www.reichelt.de/?ACTION=3;GROUP=B41;GROUPID=3173;ARTICLE=2388 (0.43 €)
the next time I order from Reichelt - but since our last order went on Friday it'd be after the holidays.

[guest7146]

I couldn't find a 3.00Mhz resonator from my usual suppliers, but 3.58Mhz was easy to come by:

http://uk.farnell.com/abracon/hwzt-3-58md/ceramic-resonator-3-58mhz-thru/dp/7948037

I would be tempted to try one of these first.  The exact clock frequency of the 68HC05C micro is probably not critical.  Definitely worth a try!

Zac67's suggestion to use a crystal resonator instead of a ceramic resonator may also be worth a try.  The only concern I have with this suggestion is that the crystal may not start oscillating because it requires proper load capacitors within a certain range of values in order to start and maintain oscillation.  It depends how compatible the values used for the ceramic resonator are with the crystal resonator.
But, the easiest way to find out is to give it a try.  You won't do any harm - the worst that will happen is that the crystal won't oscillate and it'll sit there in the same dead condition that it is now.

My advice: try mine or Zac's suggestion before spending money on those rip off components on ebay.

AH.

[guest7146]

It depends how compatible the values used for the ceramic resonator are with the crystal resonator.

I just checked the A1200 schematic.  The value of load capacitors used for the ceramic resonator is 22pF, which is pretty typical of the values used in most crystal applications.  So I think Zac's suggestion will work fine.  In any case, if you're willing to experiment, you could certainly make it work by checking the crystal datasheet and swapping out the values of capacitance / resistor in order to match the crystal's ideal values.  But I don't think it will come to that - I reckon that would work straight away.



AH

[Retrofan]

$10 is pretty much a rip off. I could order one of these:

http://www.reichelt.de/?ACTION=3;GROUP=B41;GROUPID=3173;ARTICLE=2388 (0.43 €)
the next time I order from Reichelt - but since our last order went on Friday it'd be after the holidays.

 
I'm a little lost. The cheap one you say can't be ordered alone, minimum order 10€. The one I say cost the same, and I only need one, so the one I found at Ebay is ok or not? Or it's better to buy something else in your page?
 
Wait, wait, wait... look that drawing; it's too tall... I need it low enough to have the fast ata board over it.
The one I told of Ebay has the spects I need or not? I don't mind if it isn't a crystal or something better than the original. If the one I tell is the same I will put it and will leave experiments for experts. I only want to desolder and solder the same...

[guest7146]

so the one I found at Ebay is ok or not? Or it's better to buy something else in your page?

The one you found on Ebay is okay, but it's a bit of a rip off.
 

Wait, wait, wait... look that drawing; it's too tall... I need it low enough to have the fast ata board over it.

You wouldn't have to fit it vertically.  If there's room on the board you could lie it flat on the board and bend the pins 90 degrees.
 

The one I told of Ebay has the spects I need or not?

The one you found on Ebay appears to have the specifications you need.  
 
AH.

[guest7146]

What about this:
 
http://cgi.ebay.co.uk/AMIGA-1200-A1200-MOTHERBOARD-FAULTY-REV-1D-4-/290501166915?pt=UK_VintageComputing_RL&hash=item43a3380743
 
It's a bit more expensive than the component you referenced, and it's faulty anyway, but you could rob the 3.00Mhz resonator off it and still keep the rest of the mobo for spares.
 
The decision is yours!

[Zac67]

If it can wait till mid-January I'd include it in our order and ship to you as simple letter (Spain is .70€). I'm pretty sure it works in the circuit.

[Retrofan]

What about this:
 
http://cgi.ebay.co.uk/AMIGA-1200-A1200-MOTHERBOARD-FAULTY-REV-1D-4-/290501166915?pt=UK_VintageComputing_RL&hash=item43a3380743
 
It's a bit more expensive than the component you referenced, and it's faulty anyway, but you could rob the 3.00Mhz resonator off it and still keep the rest of the mobo for spares.
 
The decision is yours!

It's a pity... because yesterday I received a sheilding alone that I bought at Ebay... I'm not going to put a shop of sheildings...
 
@Zac67 thanks a lot for the offer, but I will buy or a faulty mb or the ceramic parts of Ebay... I'm always hurry, much more when in a week and a half or so I will receive an ACA 1230/56 and I want to get it repaired first.

[Vlabguy1]

Did you try Digikey.com??

Hi:
I had an accident and a piece got broken in my A1200. It puts F3.00F. Which is it (capacitor, diode, transistor, whatever) and where can I find it?
http://img821.imageshack.us/img821/2765/abcd0013br.jpg
 
Thanks.

[Retrofan]

Did you try Digikey.com??

No, I didn't. Finally i've bought the one of Ebay. The worst part was the sending cost. If Tony at Ebay tells me he's found a faulty one I'll buy it for the future. I don't want to buy a working mb even at the same price, 'cause I know me and I would be mounting a 3rd Amiga...

[Retrofan]

Ok. I received and soldered the ceramic resonator a couple of days ago, but as I had the Amiga dismounted I desoldered the RF and soldered a cable for a Clockport expander (which still haven't tried, it's still in other thread).
 
Right now I've mounted all again to try it for the first time. I've attached the Fast Ata with the cable, the CF Hd, the internal Cd rom in the secundary channel and both with the red ribbon cable where the fast ata has number 1.
 
I've turned on the Amiga....and nothing. Black screen on the Tv and no light at all on the Amiga. Then I've disconnected the Cd rom... nothing again. I was starting to think I've destroyed my beloved Amiga, and to make the last try I've disconnected the fast ata and connected only the Cf HD, turn it on..... nothing again, black screen.... While I was making the knot in the rope to hang myself I've pressed one of the kickstart roms and it was loose... so I've turned it on again and ... It works!!!
 
Now I've got to see why the fast ata doesn't work. I don't like it's smell, but perhaps are imaginations...
 
 
EDIT: Wait a moment: I've connected again the fast ata and now it boots (it seems it was only a problem of pressure over the roms), but I only get the introduce floppy screen... I've deleted Idefix from the startup-sequence. How do I boot with a 16GB Cf Hd? How do I install the Fast ata drivers?... I will have to search.