Thank you all for the great support and responses!

I manually moved (using the RH arrow buttons) the head away from the Y-stop and m119 reports:

11:58:41.144 : N520 M119 *13
11:58:41.155 : x_max:H y_max:L z_min:L

Reading the wiki about M206, I have probably really messed up the homing offsets.  It appears that M206 is additive, rather than absolute offsets.

I can't seem to figure out how to read the current offsets.  M501 reports everything EXCEPT the Home offsets.

Maybe best to speak to the professionals via http://www.soliwiki.com/Solidoodle_IRC_Channel ; Solidoodle should be able to sort it in a jiffy I'm sure. Or Skype them (they have Skype).

And what about when you click just the house - bottom-left corner. That one means 'home all axis'

So its just chasing the Y-issue now... Try resetting the printer (remove USB and remove external power) and closing repetier.

Open Repetier, reconnect USB, click Connect. Turn on external power to the printer, then click Bottom-Left-Home-Button (Home-All).

The Home-Y button doesn't make the head move at all.  The head is not currently even close to the switch.  The GUI however does show the Y=value in black.

Currently, after clicking the Home-X button, the gui reports X=159

Since the Home-Y button doesn't do anything, should I use the GUI arrows to position the head against the stop-switch, disconnect RH, then connect RH, and click Home-Y?

I had installed my motors backwards when switching to my ramps board and had the same problem. Make sure to unplug the 12v source before removing the motor connectors.

1) Power on SD2
2) Click COnnect in RH
3) Click the "Home" Button under the Manual Control Tab
4) Everything should now just work ?....

You'll notice that when you first connect to the printer, the Y and X locations under the Manual tab are Red. This means they are 'unknown'. Click the picture of a House, then they should go black and the printer homes to its correct position.

Reading through the thread, I couldn't see if you're doing that mandatory 'click home' step - which needs to be basically the first thing you do whenever you connect to the printer. Without this step, it has no idea where the extruder head is and so yes, often shoots wildly off to where it shouldn't be...

I could be completly off base - and apologies if I am - but it sounds like you've just missed that simple step. There should be absolutely no need to fiddle with G-code to get it to behave correctly.

1) power on SD2
2) click Connect in RH
3) enter M206 X(whatever)
4) enter M500
5) click the Home X button (the print head moves to the right and hits the stop switch, RH Home X = Max)
6) enter G90, G1 X75

What I'm not sure if is if I have to click Disconnect in RH and/or power cycle the SD2 before trying #3,4,5 and 6.

Thanks much

1. Hit "park" (which uses absolute positioning moves); it should move head to (what printer thinks is) 145,145 if you are using the SD preconfigured RH. Mark position.
2. Re-home x-y and move head manually to same spot using arrows (which use relative positions moves) and see what RH says the head position is.
3. Subtract the one x position from the other (and same for y), and enter that offset uned the EEPROM settings.

Alternatively, if you're comfortable entering gcode manually:
G90
G1 X75 Y75
Measure offset in mm from true center; say your head ends up 10mm to left and 5mm to back of true center, then:
M206 X-10.0 Y5.0
(or M206 X10.0 Y-5.0, not near printer to check now, but you get idea) and try G1 X75 Y75 to again to confirm you got it right.
Then either add that M206 command to your start gcode in slic3r, or enter M500 to save offset in EEPROM.

Hope this helps..

Edit: If the park position (145,145 or whatever it's set to) or 75,75 end up slamming the head at one end of the bed, then your home is way off, so just try to adjust these till you get head to move somewhere without grinding past edge, and then measure offsets against that position.

I'll definitely watch the videos and read the articles.  I should have some time tomorrow to fiddle with it again.

The previous owner simply wanted to unload it because he hadn't used it in months.  For all I know, it could have been having these problems.  However, I do think that it's probably some setting somewhere (EEPROM?) that I'm missing.

I did happen across the post about starting/ending G-code for the Solidoodle 2.  I tried the original set from the older post and seemed to work a bit better than the newer post.

Thanks again

And if you want to install/reinstall firmware, look at the configuration.h section of  this
  http://www.soliwiki.com/3D_Printing_Har … g_Firmware
for where bed size can be specified.

You mention buying the machine used.  Any idea why the prior owner sold it?  Was it related to this issue and is it possible they tried tweaking and uploading the software?

Hope this helps.