[beostuff]

I recently acquired a dead 4002 turntable. I changed a bunch of transistors that tested badly and turned it on. It all worked for about a minute then the rectifier diodes (D1-D4) started smoking. Any ideas?

Thanks

[Dillen]

Something shorted?
Which transistors did you replace?
How did they measure wrong?
And what did you fit instead?

Martin

[Glitch]

beostuff wrote:

Any ideas?

In addition to what Martin said…

Are you doing your powering-on using a “dim bulb tester” (or equivalent)? If not, you might want to. This would reduce the possibility of doing more damage while you sort things out.

Glitch

[beostuff]

thanks for the response. Appreciate it. I am using a dim bulb tester now….I replaced TR13 and 14 as they tested bad. But now IC1 is suspect – tests as a diode on a working 4002. Fails any test on this board.

[Author]

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