THIS IS THE FINAL ANSWER ON THIS......
Sorry for necro on an old thread but I have the ultimate answer. I am an experienced engineer and knew straight away that the one I was working on should have a second HIDDEN slot. The easy to get to one one on the back and is pictured in the pdf manual you refer to above. The HIDDEN one is under the keyboard as it is on most laptops! They dont like you to know that. Why... keep the machine low on memory and youll buy another one. Dumb innit. They dont refer to this in the manuals!
However if you know that the second exists heres how you get to it. The power button is a panel near the screen. Underneath this panel on the reverse of the laptop it has three screws... one on each corner and one in the middle. Take those screws out and prise the panel off with a flat blade or screwdrivers from the left and right of the laptop with it on your lap facing you as normal - in from the left and under that panel and in from the right and under that panle. Got it off. Good.
Now youll see the 4 screws holding the keyboard on. Take those out. Now the keyboard slips around on its ribbon. Thats fine, just dont yank the ribbon out... And under he keyboard hey presto a 256MB DDR SODIMM stick... its a 333mhz type... worth £22 for a 1gb one of those from Novatech by todays prices. Swap him out... now if you have a 1 gb in the back and a 1gb under the keyboard your laptop will be 2GB... great for windows XP... and half of what you need for Windows7!
I have a photo of the memory under the keyboard to prove it... SEE THE PIC HERE... OTHERWISE EMAIL ME. ASK FOR PIC IMAG1842. MATT - click pic for larger version. Enjoy.