thoughts on Digitech Space Station eprom copying?

[the3secondrule]

OK. I have finished my xp100 to XP ALL+, with a PCB, RAM chips and Eprom from Marmaliser.

I am getting no output at all, except from the dry only Jack in XP100 mode only.
When I rotate the switch, the display changes but it is garbled nonsense.
When switching to / from XP 100 mode I can hear the relay switching
My XP100 was one without U8 populated, so that has been installed.
I have soldered the XP all+ PCB directly to the main PCB, which makes checking my soldering rather difficult.

Obviously you'll want photo's, what do you need to see specifically?
I have triple checked my wiring, however it's entirely likely I still don't have it 100%.

I'll get voltages as well - what chips do you need voltages from?

I notice my pedal does not have r47 populated. some photos in the build doc show this resistor in place, and in others it is not.

Let me know what you need from me for de-bugging.

Cheers all!

[Govmnt_Lacky]

I notice my pedal does not have r47 populated. some photos in the build doc show this resistor in place, and in others it is not.

I believe this is probably your problem HOWEVER, throw up some good pics of the mod (make sure to take good ones of your EEPROM area, RAM area, the CPU [the chip that says Digitech on it], and all of your wiring)

We will get you working 

[the3secondrule]

Heres a few pics - let me know if you need to see more.
(also if someone can let me know how to resize these Massive photos???

[Govmnt_Lacky]

You need to put a 10 ohm SMD resistor in R47 

Without it, the CPU does not know to look for an external EEPROM at all! 

EDIT: Can you post up a better pic of how you wired R30? Also a better pic of U13.

[the3secondrule]

Thanks G Lacky,

I'll see if I can attach a resistor in R47 and see if that helps.

Interesting that some of this pics in the build guide show this resistor un-populated too though...
Will try and get some better pics tonight too

[the3secondrule]

R47 did it

I don't have any SMD parts so I just had to tack a resistor on to the pads. Ain't pretty but it works

[Govmnt_Lacky]

R47 did it

I don't have any SMD parts so I just had to tack a resistor on to the pads. Ain't pretty but it works

Sweet!

And another XP ALL lives!!

[digi2t]

R47 did it

I don't have any SMD parts so I just had to tack a resistor on to the pads. Ain't pretty but it works

Sweet!

And another XP ALL lives!!

Bravo!! 

[marmaliser]

Fantastic 

[the3secondrule]

Thanks Dino & Lackey for the extremely well documented project, and Marmaliser for sorting me out with the EPROM and other bits

Didn't see any mention of r47 in the build doc, did I over look this?

[digi2t]

Thanks Dino & Lackey for the extremely well documented project, and Marmaliser for sorting me out with the EPROM and other bits

Didn't see any mention of r47 in the build doc, did I over look this?

I'll have a look and see, but it might be an oversight. The problem right now is that the gallery is full, and I can't update the present document.

Hopefully, Aron will have this sorted out soon.

[mongo]

Finallly... SUCESS!! After banging my head for days and days I meticulously checked out every step of the conversion from XP200 to 300... I had a cold trace between some of the ramchips. The thing works now.

To all the people trying these mods: TRIPLE CHECK EVERYTHING! the trace didn't seem broken or damaged in any way! so check and recheck everything so every possible problem is sorted out beforehand.

Thank you very much to all the people here for all the support and advice!

Mongo.

[digi2t]

Finallly... SUCESS!! After banging my head for days and days I meticulously checked out every step of the conversion from XP200 to 300... I had a cold trace between some of the ramchips. The thing works now.

To all the people trying these mods: TRIPLE CHECK EVERYTHING! the trace didn't seem broken or damaged in any way! so check and recheck everything so every possible problem is sorted out beforehand.

Thank you very much to all the people here for all the support and advice!

Mongo.

Great news indeed!

Nice that you found it, because when problem builds do crop up, it always sets a doubt in my head that maybe we missed something, or that there is some weird board version that we don't know about. I can relax... for now.

[Govmnt_Lacky]

Great catch Mongo!!!

I recently had a conversion that was driving me mad. Turned out the culprit was an internally shorted IC socket 

Yep.... One of the RAM sockets I used was shorted from Pin 17 to 18 inside the socket..... How does that happen? 

[mitchschaft]

Gentlemen, I'll be modding my XP100 as soon as my chip burner comes in from china. I got it for christmas of '94 I think. It's been collecting dust ever since, ha.

Anyway, I just wanted to post a small typo in the document. Page 20 under "So, we need to desolder the holes for:" "- C61, C64, C65 (10uF), and Q63 (0.39uF)"

Q63 needs to be C63. That one took me for a spin the first time I saw it and took me a minute to figure it out lol. Anyway, I'll post back when I get it done. Thanks for the great info.

[digi2t]

Gentlemen, I'll be modding my XP100 as soon as my chip burner comes in from china. I got it for christmas of '94 I think. It's been collecting dust ever since, ha.

Anyway, I just wanted to post a small typo in the document. Page 20 under "So, we need to desolder the holes for:" "- C61, C64, C65 (10uF), and Q63 (0.39uF)"

Q63 needs to be C63. That one took me for a spin the first time I saw it and took me a minute to figure it out lol. Anyway, I'll post back when I get it done. Thanks for the great info.

Duly noted. I'll update it asap. Thanks.

[Govmnt_Lacky]

Gentlemen, I'll be modding my XP100 as soon as my chip burner comes in from china. I got it for christmas of '94 I think. It's been collecting dust ever since, ha.

Well, if you have any questions... this is the place to ask! 

[digi2t]

Build document updated, and uploaded to Gallery. Corrected a typo, and added a note regarding R47. Unfortunately, I had to upload it in two parts (new Gallery rules regarding upload file size);

Part one (pages 1 to 33);

http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=51928&g2_GALLERYSID=b8ad4712e015009dd060fe36e07d52a3

Part two (pages 34 to 67);

http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=51931&g2_GALLERYSID=b8ad4712e015009dd060fe36e07d52a3

That should clear up some problems.

[mitchschaft]

Cool, thanks. I started this yesterday. Got all the SMD parts down (thank god for the hot air rework station) and now I'm working on the little board I got from Oshpark.

[mongo]

 I have a problem with my second XP200-to-XP300 mod:

Everything went ok, the unit woke up as a Space Station when I put the extra RAM and the EPROM, but after some time the unit has a MASSIVE drop of power, no more sound, and the number display just fades out. I tried changing the caps, diodes and regulators from the power section. Keeps doing it. It reaches a certain temperature and then shuts down, signal passes but no effect, and when I let it cool down it works again... very weird.

Any thoughts?

Thanks in advance,

Mongo