Please ignore my request. I have just noticed the second sticky post with links to service guides. (I only noticed the first link before). I see a service guide for 1600 which I suppose will be the same as for 1603.
I have just bought a second hand Aspire 1603. The HDD showed internal damage so I obtained a replacement and now need to install it. I obtained a user guide from the Acer web site but it just says "Consult your dealer if you...