SP-300V capacitors

What kind of issue are you having? It's pretty rare a capacitor causes an issue on these printers unless you can see it is physically damaged.

 

Usually when a fuse continues to blow it's a bad cable some where along the line or a damaged terminal that the cables plug into. I would start by checking all the cable leads and making sure they aren't dirty, damaged, or corroded. Also air dust all the boards and pay special attention to the terminals. Also, if a head fails electronically sometimes it can cause the same issue. It's not the best way to do things but you can test this by plugging 1 head in at a time and turning the machine on. When the fuse blows, you know which head is causing the issue.

 

digikey.com for the capacitors

 

its the transistor, mine was just one, can check them without unsoldering them. one or two will give different readings than the others.
got mine from china, or you can pay 5x as much and get them in US for like $25 each

highly doubt you need caps

 

I don't think you can measure capacitors while they are still on the board. You will have to desolder them from the board and then measure them to see if they are out of spec.

 

Correct, you cannot test caps on the board, doesn't matter it's the transistor at fault