 MS with blown diodes |
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| bd1308 |
 Mar 18 2006, 10:24 AM
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#1
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Sir Post-a-lot  Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501  |
does this actually happen during normal use?
I got a freebie MS last night but it needed some diodes and some transistors replaced. if i were to get this working on the '14, would they blow out during normal use? Thanks steven again for all of your help/patience and for helping me create the very first AWD 914 (IMG:http://www.914world.com/bbs2/html/emoticons/cool_shades.gif) b |
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| Carrera916 |
Mar 18 2006, 10:34 AM
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#2
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Member Group: Members Posts: 292 Joined: 9-February 03 From: Pleasanton, CA Member No.: 273 |
(IMG:http://www.914world.com/bbs2/html/emoticons/poke.gif)
Come again?...you say AWD 914? that would be really cool....what would you use as AWD driveline? Audi Quattro stuff? Ummm, i got these laying around here....maybe I ought to do that....I gotta be that (IMG:http://www.914world.com/bbs2/html/emoticons/screwy.gif) ! As for the MS, nah, it sounded like the input voltage to the MS might have spiked too high for the watt rating of the diodes and resisters....take a picture of the PC board if you can...I'd like to see it.... |
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| Dr Evil |
Mar 18 2006, 10:36 AM
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#3
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Send me your transmission! Group: Members Posts: 22,995 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region 
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No, not normal at all. Either the polarities of said componenets were not correctly observed, or parts with incorrect tolerances were used. The only other possibility I can think of is that it was installed in a hot area. Check the schematic to make sure.
Oh ya, and a possible spike. |
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| bd1308 |
Mar 18 2006, 10:58 AM
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#4
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
v1.01 without flyback module (which is presumably required for these 914 injectors)
pics later. b |
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| Dr Evil |
Mar 18 2006, 11:01 AM
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#5
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Send me your transmission! Group: Members Posts: 22,995 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
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You may be the one in need of my v2 kit. I was going MS, but then got a 2.7 w/ CIS and decided to go MJLJ instead. I have the board with the chip programmer and the stimulator. the board is not completely assembled as I used many of the parts for the MJLJ project. PM me and we may be able to work something out. Also, I am likely to have some of the diodes left that you can have.
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| bd1308 |
Mar 18 2006, 11:05 AM
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#6
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
i'm gonna go ahead and replace all of the diodes and transitors...
and then im gonna get the stimulator to see if i can get anything to work. I bet something spiked and it roached the diodes, but when im looking at this board, i dont see *ANY* melted or roached areas (roasted board) or anything that would indicate a problem. Besides the diodes that were 'unplugged' to ID the dead ones, I would think that this still works. b |
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| Katmanken |
Mar 18 2006, 11:09 AM
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#7
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Use little hair clips on the leads to act as heat sinks. Some people make good and sure the solder is heated, and sometimes damage the components. Use silicone heat grease if components attach to a heat sink.
Ken |
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| davep |
Mar 18 2006, 11:20 AM
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#8
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914 Historian Group: Benefactors Posts: 5,138 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
Not sure about the flyback module function, however in electronics design one always puts a diode across the solenoid of a relay to suppress the spike that occurs when the solenoid is de-energized. The un-suppressed spike can damage other components in the circuit.
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| rick 918-S |
Mar 18 2006, 11:44 AM
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#9
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Hey nice rack! -Celette Group: Members Posts: 20,443 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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I have no idea what you guys are talking about, (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) but it's cool! I have got to get with this lingo. (IMG:http://www.914world.com/bbs2/html/emoticons/cool_shades.gif)
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| tdsmoonchild |
Mar 18 2006, 01:24 PM
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#10
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Terry Group: Members Posts: 197 Joined: 18-January 06 From: Duncanville,TX Member No.: 5,431 |
(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) |
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| Mueller |
Mar 18 2006, 01:47 PM
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#11
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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Blown diodes = operator error
on my 1st MS, I didn't follow the directions and didn't have the injectors hooked up with a relay...with the MS off, power was still going thru the injectors and made it way back to the MS, frying some parts.... not a bad idea to replace some of the components, the diode and transistors are dirt cheap..... if you order from Mouser, there is no minimum purchase...for DigiKey, you must purchase at least $25 or get hit with a $5 fee. |
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