Okay, I will do it when I manage to reassemble my printer. Also, 2 newbie questions (I am new to these kinds of printers):
1. Why do I need 2 black cartridges in my printer?
2. Is there a service manual available somewhere on the net where it describes how to disassemble and assemble my mp830?
Nevermind, I found it without accessing the bottom. My rectangular pad seems to be clogged because whatever I try, it stays black while the square pad is already white.. I am leaving the rectangular pad in a cleaning fluid and I'll see what happens. What should I do if it still stays black?
I tried to do what it says there(http://www.nifty-stuff.com/forum/viewtopic.php?id=5390) in post #4 but when I removed a rectangular pad, I accidentally dropped it inside.. Now I am stuck with my printer without its top part and I dont know how to reach the bottom where I can find that pad.
So, I found this printer on a boot sale and risked buying it. I was very surprised to find out that it's fully functional and a seller didn't lie... Apart from one thing - it does not print black. I went to the Maintenance menu and did everything it had there. I even bought new black cartridges...