Page 1 of 1
no low Tom and r237 is HOT(RESOLVED)
Posted: Jun 3rd, '15, 18:38
by dasanalog
Did service manual noise revision and have solved my 130mv problem. My issue is now I'm no longer getting a low tom/Congo sound and only hear the noise. Also r237 right above the low Tom is getting extremely hot. I'm not sure on what it is R237 is responsible for. I've looked around and don't see any obvious shorts. Anyone have a suggestion on how to proceed from here? Vincent?
Re: no low Tom and r237 is HOT
Posted: Jun 3rd, '15, 21:27
by dasanalog
It actually looks like both R236 and R237 are getting hot...
Re: no low Tom and r237 is HOT
Posted: Jun 4th, '15, 05:32
by e-licktronic
Dear dasanalog,
Check that U15 are in the right way. If it is try to replace it ( any common double AOP will do the job for the test ).
Best regards,
e-licktronic
Re: no low Tom and r237 is HOT
Posted: Jun 4th, '15, 08:05
by dasanalog
Thanks for the reply. U15 is in the correct direction, The tom has been working and only stopped after I did the noise revision that's in the service manual. This is why I am confused as to why it would stop. I upgraded the opamp in the master section so I have a spare 4558 I will put in to the circuit to test.
Re: no low Tom and r237 is HOT
Posted: Jun 4th, '15, 18:02
by dasanalog
Vincent, you were correct! It was a bad opamp.