Many years ago I bought my self an Epson Scanner V700 Photo knowing that it had a defective mainboard.
This project sat collecting dust until I finally decided to find the parts and get going. I am indeed a Newbie but have manged to fix many electronics following my intuition and online help.
I thought this was going to be as easy as getting a new board and replacing it. Through extrapolating info I realized that I also needed to buy a PROM (or One time programmable Rom chip that is "plugged" into the main board.
I got the mainboard and the PROM directly from epson and the label on the PROM reads O.T.P ROM (Blank ROM) I looked extensively online for information regarding the replacement of the board and/or a service manual but it looks like epson is doing a great job in keeping this info hermetically unavailable.
I guess that nonetheless my questions are basic and might get answered here. (They all refer to the pictures attached)
Question number 1)
How do you determine the direction of the chip? It would seem that it can fit in two possible ways. Text straight or text upside down. (Is the text a standard for indicating the positioning of the chip?
Question number 2)
The notion that this is either a blank rom or a one time programmable one leads me to believe that it has to be programmed. Is that so or is it possible that when I turn on the scanner the board it self takes care of "filling" the rom?
Question number 3) If uncertain about 2) is there any risk on turning on the scanner with the blank rom on?
Thank you very much in advance for your help!