ADF and Scanner section size detection

Hi guys and gals,

I just looked at a C284 (non 'e' version) that was exhibiting some strange behaviour.

The symptoms were;

Placing an A4 document on the feed tray yielded an error message stating Original on Glass. Remove Original.
Placing an A4 portrait size sheet on glass; Machine detects A3.
Placing an A4 Landscape size sheet on glass; Machine detects 8^1/2 x 14".

I'm located in Australia, and we don't use those weird sizes. At the moment the issue is gone.

What I decided I would try was to set this particular setting; [Service Mode] > [System 1] > [Original Size Detection] and change Copy Glass from Table 2 to Table 1. Instantly the problem disappeared. By default it looks like Table 2 is the default for Australia (according to the myriad of C284e's in my office.)

My question/s is/are:

Is there any adverse effects to changing the size detection table to 1?
Is there a copy of either Table to look at?

I've searched through the Service and Theory manuals, but all I can make sense of is this:

(1) Copy Glass

• To change the size detection table for document glass.

• The default setting varies depending on marketing area.

• Table 1
  
• Table 2

• Table 2 can be set only when original size sensor 2 is being mounted.

It has the second size sensor installed from what I can see. (2 black rectangular boxes with a small dome shaped sensor at the rear right section of scanner.

Firmware is G20-66. Currently downloading the most recent firmware, but on the work internet connection, downloading anything sizeable takes 1.5 hours or more.

I appreciate any suggestions or help.

Cheers.