Circuit Specialists has them in their 1998 catalog.
www.cir.com
1-800-528-1417
MPSU07 $1.48
MPSU57 $1.88
-jeff
>Hello again,
>
>Thanks to joelr@an.hp.com for letting me know about the ce being
>the negative side of the caps. Anyway, I got the boards together and
>plugged them in last night and had another light show. Again I fried
>a bunch of resistors: R30, R35, and R34. This time I also blew out
>F2. Looking back at what jwelser@ccwf.cc.utexas.ed had to say:
>
>> The only things that can sink enough current to toast resistors on
>> the defletion board are the deflection transistors, or maybe even the
>> pre-drivers. I doubt an HV problem caused those to toast. If you have a
>> short on the HV board, one of the two fuses located near the connector
>> that goes to the HV board will usually blow (or both might blow...) A
>> "normal" deflection board won't toast istelf as a result of this, and
>> operating the deflection board with the HV board unplugged has the same
>> effect as having those fuses blown.
>>
>I had hoped that the new transistors (Q16, Q17) had solved the problem.
>After watching the sparks (plasma) fly, I figured Q14 and/or Q15 were
>the problem. Sure enough, I pulled out Q14 and it was shorted all the
>way around (I think Q15 had problems too). The transistors on the other
>side of the board (Q4, Q5) seem to be OK. So, where can I find these
>parts: MPS-U07 and MPS-U57? The Woodcock/Scheive material I have looked
>at tells me that NTE188 and NTE189 are equivalent parts.
>
>Thanks.
>
>Dan R.
>dras@sw.stratus.com
jeffh@diac.com
Buy/Sell/Trade classic video arcade games.
www.diac.com/~jeffh/
Received on Thu Nov 20 09:30:31 1997
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