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Test SCR
Perfect, I tested my SCR and the result is positive.
First I switched S2 and after I pushed S1, and the lamp stays on ( 3 watt + 3 watt) WP 20141110 21 27 01 Pro - YouTube Now, who is the guilty? :confused: |
Does anyone know what to do?
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Hello all
Thanks for this very useful topic!!! Can someone help me out with an OT104 thyristor? We found out that's the part that got broken in the CDI but can't find a new one and don't know if it could be replaced by some other part that have similar function? Any help would be very appreciated!!! Thanks! Wout almost desperate to get my '74 chocolate brown rolling :rolleyes: |
The best replacement for this thyristor i have found in Europe is the BTW30-800 from STMicroelectronics. It has the same package (TO-48) and is specified with a Tq max of 12 µs.
The replacement by a International Rectifier 50RIA80 or similar which is not specified with a Tq max is at risk of blocking when operating at high temperature. |
Thanks!!!!
gr Wout |
Excellent information. Thanks!
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Very good thread!, subsd.
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There are should be US version of the BTW30-800 replacement...
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The electrically equivalent thyristors I found with a 2Nxxxx number are not using a TO48 case.
The 2N692A Which in available worldwide is not specified with a Toff max. It is specified with a Toff typical (not max) of 15 µs by only one US manufacturer : Central Semiconductors Corp, Hauppauge NY. |
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Have you received my pm? Thanks for the information!!! gr Wout |
Transformer
Thanks for these useful info!
Does anybody know what transformer is used in this circuit (windings,...) and/or where I can get that part? Thanks |
Thanks for these useful info!
Does anybody know what transformer is used in this circuit (windings,...) and/or where I can get that part? Thanks |
does anyone have more info about this bosch unit?
http://forums.pelicanparts.com/uploa...1454426909.jpg http://forums.pelicanparts.com/uploa...1454426926.jpg |
This may help:
TSZ Zündung CIH Manta 400 BMW 1802 GTI 914 Capri 1 W109 Golf 1 in Aachen - Aachen-Brand | eBay Kleinanzeigen Quote:
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I could be wrong but this is essentially very similar to the ignition transistor output stage found in an early Bosch DME.
The box gets triggered by the distributor and replaces the classic points. It charges the primary of the coil. Think of it as transistorized Kettering setup. Ingo |
Can a similar test be performed on the 6 pin CDI?
Quote:
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You can duplicate the test and use a square wave generator for the distributor I have done it on the bench many times.
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Can I manually turn the distributor, since it is off the car?
I have a rebuilt SC motor, with unknown history, which will go in to my '71. I hope to verify the SC's CDI operation before I build a custom harness. Thanks. |
You can trigger the 6-pin by hand with the distributor or even with an AA battery but ideally you run the box over night at high RPM to ensure it'll not shut down when it gets hot. When I test boxes some fail only after 6h - 8h and you'd never catch that with a quick test. Alternatively you'd have to put the box into an oven heated to ~150 degF to simulate engine bay conditions.
That's why some sort of automated trigger (e.g. signal generator or your drill connected to the distributor) is preferred. |
See here for a simple triggering device for 3-pin and 6-pin boxes http://forums.pelicanparts.com/porsche-911-technical-forum/375120-6-pin-cdi-problem-under-temp-6.html#post3615049
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