I lost my manual , i dont remember how to set the clock in my fm/am compact disc player cdx-gt340

Setting the Clock for All Systems Except AM-FM Stereo with Compact Disc Player
Press SET. Within five seconds, press and hold SEEK until the correct minute appears on the display. Press and hold SCAN until the correct hour appears on the display.

Setting the Clock for AM-FM Stereo with Compact Disc Player
Press SET. (The radio may be on or off.) Within five seconds, press the SEEK right or left arrow until the correct minute appears on the display. Press and hold SCAN until the correct hour appears on the display.

Hope it helps

Download the Installation/Connection Manual here.

here is the link to your manual......

http://www.docs.sony.com/release/CDXGT310.pdf

Have a great day!!!

had a search around and found a manual for you to download:

www.retrevo.com/support/Sony-CDX-GT07-Car-Receivers-manual/id/16768bh031/t/2/

If you buy a wiring harness from this guy he will send you a wiring diagram. Copy and paste the web address.
Here you go bud:

http://cgi.ebay.com/SONY-wire-WIRING-Harness-XPLOD-XR-CA430-CDX-MP30-sn6_W0QQitemZ200417888633QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea9d64979

Installation/Connection Instructions:
http://esupport.sony.com/US/perl/model-documents.pl?mdl=CDXM800&region_id=1

Press DSPL for 2 seconds
Press the + or - volume buttons to set the hour
press SEL
Use the volume buttons to set the minute
Press DSPL

http://esupport.sony.com/US/perl/model-documents.pl?mdl=CDXF5710&region_id=1

Download the manual from here

Have you tried pressing hte RESET switch?? It's behind the removeable front of the stereo, use a biro or something and hold it in for a bit.

Failing that, check that there isn't a CD already in it, could be a dodgy CD?

Press DSPL for two seconds
USE volume buttons to set hour
pres SEL
use volume buttons to set minute
press DSPL