Thank you for having the manual I needed for an older model Aiwa stero I had found on Ebay --- I wanted the Aiwa because I had tapes and cd's but I did not have a manual as to how to operate the system... I found what I needed and it has enabled me to set the system up for my enjoyment.
I wished detailed information of the JBL S310 and here I found it! Very happy with the service from this site!
Text excerpt from page 55 (click to view)
To reduce or enlarge a document
To make a reduced copy, press COPY ZOOM repeatedly and select the desired reduction rate. The unit can reduce copies to as little as 50% of the original by changing the reduction rate 5% at a time. Example: 70% reduced copy Original document Reduced copy
To make an enlarged copy, press COPY ZOOM repeatedly and select the desired enlargement rate. The unit can enlarge copies to as much as 200% of the original by changing the enlargement rate 5% at a time. Example: 150% enlarged copy Original document
display will show the rate you selected while copying. Example: 75% FINE 
an enlarged copy, the unit will only enlarge the centre of the upper part of the document. To make an enlarged copy of the bottom of the document, turn the document around, insert it into the unit, and then make a copy.
To collate multiple copies
The unit can collate multiple copies in the same order as the original document pages. Press COLLATE until the following is displayed and start copying. Display: COLLATE=ON
Example: Making two copies of a 4-page original document
4 3 2 1 3 4 3 2 1 1 1 2 2 3 4 4
Collated pages Note:
unit will store the documents into memory while collating copy. If memory becomes full while storing, the unit will only print out the stored pages. q While collating copies, the display will show the following. Example: 100% FINE C shows collating copy