I have lost my instructions manual for my CASIO G-2800-1 TOUGH SOLAR watch

try the link below
http://support.casio.com/en/manual/manuallist.php?cid=009

You can download manual from Casio's web page. I give you couple links.

MTG900DA 8V Shock Shock Mens Tough Water Resistant Analog Digital Watches...

In depth Review of Casio MTG 900 Shock Waveceptor Tough Solar Watch

Today my 6-year old Waveceptor has adjusted itself to daylight Savings time without my intervention. I was agreeably surprised. For all the years I have had the watch, I kept the module manual by my side just for the two times a year I have to adjust the time.
All this to tell you that you imperatively have to read the module's manual. If you do not have it visit the Casio Worldwide web site and download it. You need the module number. You will find it on the back of the watch. It is a 4-digit number inside a rectangle.

you can get setting instructions off the link below
http://world.casio.com/wat/download/en/manual/

You can get instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

You can get instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

If you haven't got instructions on how to do this, you can get
instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

Go to the Casio web site "casio.com", select "support" and the "manuals", then "watches", accept their terms and conditions,

Insert the module number and download instructions.

Copy the manual from;

http://ftp.casio.co.jp/pub/world_manual/wat/en/qw2688.pdf

My victorinox 24731 has gone silent. the alarm sounds if i lift the back flap and push a little black disc in the rhs bottom corner. but it does not work when i set it . it has been working perfectly for the past six months