hello,what are the diffrent of Sony optical head,there are part no kss213a,kss213b,c,d,e,f,.any electrical changes of that particular part no?can kss213c replace by kss213f without any adjustment. Thank you. _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com ------------------------------------------ Make your TechAssist database better! Submit Repair Tips here: http://www.tech-assist.org/secure/tip/ ------------------------------------------ To UNSUBSCRIBE your email address, click here: mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe Or send a BLANK email with unsubscribe in the SUBJECT field to the address above.