fixing of up - IV or V or VI

[giath]

HI ALL
Can anyone lead me , help me or provide me on schematic diagrams for these up- v or IV....coze it costs much money to buy them. is any thing usefull or helpfull to repair them.....
any help is appreaciated , thank you all
this is my mail : giath2008@hotmail.com

[gravy258]

http://www.rtelectronics.com/

they sell remanufactured micros