Yep, I think they are diodes... And your diodes don't look very good. It looks like they may have overheated.
There are several of those diodes on the other side of the board. Under the electrolytics and between some of the larger chips near the power fets. They all have the same designation on them on my drive. I'd take some of them off and see what you have when you put an ohm meter across them. If your meter has a diode test setting so much the better. If you are going to attempt a repair I'd replace the electrolytics even if they are not bulged. They are cheap and they fail from age. Dave On 2/9/2015 11:43 PM, Dean Posekany wrote: > After the comments/recommendations to think about attempting a repair to > the Parker drives, I popped several open and took a good look around. On > the top surface I could find no obvious problems. Not popped caps, no > burn marks, nothing. On the bottom, I found what looks to be a problem > on two of the bad drives. There are three SMD's located near the drive > output port that appear to be toast. The problem is I can't identify > them. The board stencil “CR” notation seems to indicate they are crystal > rectifiers and you can see polarity marks on one side. I tried to track > down the SMD codes online but had no success. Soooooooo, since some of > you spurred me on, I thought I'd throw this back out here to see if any > of you guys had any ideas. I've attached links to three photos that may > be of some help. > > This is a close-up of one of my good drives: > > _https://www.dropbox.com/sc/fzugl3ebp7hlbbj/AABZSMn6f70FORZS3FpRhRc-a_ > > This is a close-up showing the suspect SMD's on a bad drive: > > _https://www.dropbox.com/sc/eeoy5dpw1861j54/AAAigtSkz9aLiKBbZVY9FFUia_ > > And this is a close-up of the shot Dave supplied yesterday for one of > his Parker drives: > > _https://www.dropbox.com/sc/hwfjcjmtqpwjfyh/AAD09FOOfweAwIAbjbs9FRwQa_ > > It's interesting to note that the SMD part codes on Dave's board are > different than mine. But I couldn't track down the parts using his codes > either. > > > Any thoughts? > > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming. The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
