Lost manual, need to set time... I have a Casio, model F-91W

Deron, Check the attached links,manual,instruction and guides, Good luck .
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Casio 91W User Guide Quick guide to set the time and use all the functions
How do you turn off hourly beep on casio 91w
Casio F91W Module No 593 Watch

THE CAPACITOR OF MIGHT HAVE SHORTED.
PLEASE GO TO AUTHORISED SERVICE. NO PERSONAL REPAIR IS DONE.

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

Hi,you need to look at the user manual..
just in case ,if you need soft version of the user manual pls visit the URL below..

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CASIO Watch User Manual Archives

http://world.casio.com/wat/download/en/manual/
Use this page to download a copy of CASIO watch manuals in PDF format.
To download a PDF file, enter the four-digit (or three-digit) module number marked on the back cover of your watch.

ho do i set my f-91w

For all those who lost their Casio watch manual. Follow this link, fill in the requested details and download manual. http://world.casio.com/wat/download/en/manual/
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Get manual here: http://world.casio.com/wat/download/en/manual/
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Most of these resin-case F-series Casio sport watches use a fairly large lithium coin cell battery. Once the four screws holding the watch back are removed, you should be able to just pop off the stainless steel spring clip that holds the cell in place and pull it out, without having to remove any more screws. Be careful when replacing the clip, because it is asymmetrical and goes in only one way. Also be careful not to lose the tiny spring contact that connects the watch movement to the piezoelectric sound element glued to the watch back. If you lose the spring, the watch will still run, but the alarm won't sound anymore.

Hi go to www.casio.com/support under technical support choose manuals

This reset trick works with other Casio Alarm Chrono digital watches, such as my old Model W-720, similar to your F91-W. After the new lithium coil cell is installed and secured with the spring clip, the watch may show random segments in the LCD display or may simply be blank. Insert a sewing needle, paper clip, or blade of a small jeweler's screwdriver into the hole on the back of the movement stamped "AC" (All Clear) to momentarily connect the gold plated contact at the bottom of the hole to the stainless steel battery clip. The battery clip in most such Casio watches is connected to the "+" terminal of the coin cell. This will reset the CMOS chip and it should start up with the watch displaying 12:00 and the date at 1-1. Then, use the control buttons to set the time and date in the normal fashion.