Horizontal Width Adjustment on 12" RGB Monitor

[equant]

I have an Apple 12" RGB monitor that doesn't use the full width of the screen. The top and bottom go to the edge of the screen, but the image needs to be stretched horizontally. On the back of the monitor I see tiny holes that let you adjust the screen position and the vertical height, but no horizontal adjustment. The unused area is approximately 3/4" on either side.

Am I missing something obvious, or is this the correct behavior for this monitor, or is there a way to adjust it if I crack the monitor open?

Thanks.

 

[shred]

You have to take the back off, I'm afraid.

If you've never done this, there are two screws underneath and a pair of internal plastic clips at the top. You push down on the top / front part of the case about an inch in from each side to release the plastic clips. It's hard to describe - there's kind of a knack to it. Please don't butcher up the case by trying to force it with a screwdriver!

The adjustment is on the left-hand side of the monitor (looking from the normal viewing position) and is labelled L501. You need a plastic hex head adjustment tool. The correct image size is 205mm wide by 153mm high. Some people like to adjust it right out to the edges of the visible area, however this is not the correct size - you lose the true WYSIWYG features of the Mac if you do this.

The adjustment is close to to the EHT transformer - an area where high voltages are present. You must use a plastic tool for this adjustment for safety (plus you can crack the ferrite slug if you use a metal tool).

 

[equant]

Whew, thanks shred for the details. Looking forward to getting it set right.

 

[LCGuy]

Some people like to adjust it right out to the edges of the visible area, however this is not the correct size - you lose the true WYSIWYG features of the Mac if you do this.

Another issue with adjusting the raster to fill the entire display is that by making the display bigger, you're using up more of the CRT, therefore pushing the aging power supply to work even harder, shortening its life.

 

[shred]

..and the geometry isn't too good right out at the far edges either.

 

[Dog Cow]

Here's a "Hot Tip":

Use a graphics program to make a square on the screen. Then, as you adjust, as long as the square is square and not rectangular, then you know that you are not distorting the screen size.