Page 2 of 2 FirstFirst 12
Results 11 to 18 of 18
  1. #11
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    40,129
    +1
    1,839
    Quote Originally Posted by bfarnam View Post
    Hmmmm . . . can you please tell me what you used to remove the aliphatic polyurethane potting compound? Obviously you start with picking out the bigger chunks, but it looks like you used some sort of board wash.
    Mechanical removal only. Toothbrush and dental picks for the final cleaning stages.

    There apparently is a special solvent that will actually dissolve the gel, but I do not know what it is called or where to get it.

  2. #12
    Moderator HiPeRcO's Avatar
    Join Date
    Jul 2007
    Location
    Upstate NY
    Posts
    2,747
    +1
    211
    Quote Originally Posted by bfarnam View Post
    Hmmmm . . . can you please tell me what you used to remove the aliphatic polyurethane potting compound?
    (Agreed, the potting is polyurethane based, not silicone based)
    Last edited by HiPeRcO; 02-05-2018 at 11:28 PM. Reason: Corrected potting material type

  3. #13

    Join Date
    Jun 2017
    Location
    St. Louis, MO
    Posts
    49
    +1
    3
    Well its not polyurethane as that is not removable. It is most likely aliphatic polyurethane potting compound. This does not set "hard" and remains a soft "gel" (shore Hardness less than 50 or 70) but is not silicon based as Sylgard is. Silicon based potting compounds do not crystallize or discolor over time and are generally very hard to remove and do not have the heat transfer properties that are desired in the Polaris EMM. They will just trap the heat on the board and heat soak the components.

  4. +1 by:


  5. #14

    Join Date
    Sep 2017
    Location
    Michigan
    Posts
    9
    Hey guys. Not sure if this is the place to post this? But Iím working on the emm in my 2000 genesis. Q30 looks like it has a diode soldered to it. Iím sure there are people on here the are way better at electronics than I am. I wasnít sure if the mosfet transistor should be replaced or if this was someoneís way of bolstering it the circuit?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	58F63544-5298-4906-9493-30E61E714B44.jpg 
Views:	203 
Size:	62.8 KB 
ID:	434866  

  6. #15
    Moderator HiPeRcO's Avatar
    Join Date
    Jul 2007
    Location
    Upstate NY
    Posts
    2,747
    +1
    211
    That is very strange. That diode is connected from drain to source, and if I see the polarity marking correctly it would simply be in parallel to the MOSFET body diode (and installed in the same polarity as the body diode, e.g. Anode to Source, Cathode to Drain). So it wouldn't seem to be doing anything...

    Are there other signs of someone being in there and hacking around?

    What are the symptoms of your EMM?

  7. #16

    Join Date
    Sep 2017
    Location
    Michigan
    Posts
    9
    I noticed that c27 was burnt and 28 was cracked. It didn’t idle very well but I found the fpr in the bottom of the tank. Now I have done the repair. The reason for looking was a post I read on here. I haven’t found anything else in there that stands out. But decided to change the capacitors also the dielectrics. So am I correct in thinking I should change the MOSFET ?

  8. #17
    Moderator HiPeRcO's Avatar
    Join Date
    Jul 2007
    Location
    Upstate NY
    Posts
    2,747
    +1
    211
    Quote Originally Posted by MacGyver1981 View Post
    I noticed that c27 was burnt and 28 was cracked.
    Click image for larger version. 

Name:	20180614_214107.jpg 
Views:	87 
Size:	62.2 KB 
ID:	434937

    You mean like this? These capacitors get replaced on every EMM repaired here at Lakeside Tech.

  9. #18

    Join Date
    Sep 2017
    Location
    Michigan
    Posts
    9
    Pretty close to that. The traces are still good they didn’t burn off.


Page 2 of 2 FirstFirst 12

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Replies: 27
    Last Post: 04-20-2017, 11:04 PM
  2. What is inside a Polaris Virage steering cable?
    By K447 in forum Polaris Open Discussion
    Replies: 10
    Last Post: 09-01-2014, 10:22 AM
  3. What is inside a Polaris Ficht EMM - 45 volt & 12 volt power section
    By K447 in forum Polaris Tech Tips and Info
    Replies: 10
    Last Post: 10-09-2013, 10:19 PM
  4. 2002 Polaris Virage - EMM computer question
    By kkn0621 in forum Polaris Open Discussion
    Replies: 1
    Last Post: 05-17-2011, 12:09 AM
  5. What is the longest drive-shaft made by Polaris?
    By JGringo in forum Polaris Projects
    Replies: 4
    Last Post: 10-29-2007, 11:44 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •