Dragon
Interflip, 1977So the sound board on Dragon recently started blowing capacitors in explosive fashion. It is also taking out the associated diode. I tested the components and found one transistor that didn't measure propely but I'm not sure if that could cause the issue.
The blown components come off lines 29 and 30 which I believe is the coil voltage if I'm understanding the schematics.
Any help would be much appreciated.
First, give that board a good cleaning/vacuuming.
Second, was that cap polarized, and if so, was it installed in the wrong direction?
Yes, a shorted transistor could cause problems, especially if it directs current to the wrong places.
Quoted from ForceFlow:First, give that board a good cleaning/vacuuming.
Second, was that cap polarized, and if so, was it installed in the wrong direction?
Yes, a shorted transistor could cause problems, especially if it directs current to the wrong places.
I'm not familiar with this notation in the schematics. Can someone answer if this capacitor is polarized?
Quoted from alveolus:I'm not familiar with this notation in the schematics. Can someone answer if this capacitor is polarized?
Yes, that indicates polarity. The side with the short line is positive, the larger cup shape is negative.
Quoted from ForceFlow:Yes, that indicates polarity. The side with the short line is positive, the larger cup shape is negative.
Thanks. There is no way to tell if it was installed backwards as nothing is left but the leads and rubber base.
I guess I could replace it and the diode one more time.
None of the transistors are shorted, though one seems to read incorrectly(open, perhaps?)
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