Oops . I let the smoke escape

slm · 1336

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Offline slm

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on: January 30, 2017, 12:41:45 PM
Hi All

I just burned out the 90.9 r resistor r1 on the d side of the board in a moment eerily like H bonilla's below.

I tested the a side and it was functioning fine . When I went to do the d side I shook a little on the test probe and shorted the IA wire to the b terminal on the MJE 5731 . I am guessing that this was the cause because the smoke escaped shortly after that . Cannot find any errors in the diode string . Does a shorted transistor cause a burnout of r1 ? In which case I need a new c4s board I guess ......
« Last Edit: January 30, 2017, 12:44:10 PM by slm »


Offline slm

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Reply #1 on: January 30, 2017, 02:01:55 PM
I just compared resistance a to d sides . The diode string on the a ( working side ) has infinite resistance to ground and the d side only about 100 ohms - means I fried the diode string too  ?


Offline Doc B.

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Reply #2 on: January 30, 2017, 07:26:06 PM
yup

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

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