Not all printer boards are high grade. Our cut off is printer boards, typically from Laserjets that have memory slots on them, will be included into the motherboard pile. However if we receive a large volume of these, several hundreds of pounds, we wouldnt include them ALL into the mothergrade mix as it would put us at greater risk of a lowered assay.
I understand you are frustrated and would like an entire list of what is what, etc. The problem is with millions of types of boards it would be impossible to really make a comprehensive list. Also different buyers categorize things differently. There may be some boards that some guys mix in with a grade that we can't. Since we are refinery direct we can't take that risk since we are paid on the recovery.
This is where you need to find a buyer that really knows their stuff. This is where we excel with 7 years of experience. We have customers bring material in and we will upgrade their pay on alot of the low or mid grade boards based on experience.
Bookmarks