I see a capacitor from the base of one transistor in the dual fed by p vol.
If that was shorted, it could stop the p vol from working.
Also check the comparator fed by the reset circuit.
It would short p vol signal to gnd and stop it from working.
I think it is a mute circuit for the output to prevent
Clicks etc when turning on or off.
Bob
If that was shorted, it could stop the p vol from working.
Also check the comparator fed by the reset circuit.
It would short p vol signal to gnd and stop it from working.
I think it is a mute circuit for the output to prevent
Clicks etc when turning on or off.
Bob
From:
tuk88@rocketmail.com [PolySix] <PolySix@yahoogroups.com>;
To: <PolySix@yahoogroups.com>;
Subject: Re: [PolySix] Re: Non-working attenuator
Sent: Wed, Dec 31, 2014 10:54:59 AM
To: <PolySix@yahoogroups.com>;
Subject: Re: [PolySix] Re: Non-working attenuator
Sent: Wed, Dec 31, 2014 10:54:59 AM
Thank you Malte,
I checked the cable they are OK. I test the continuity between the KLM368 and the KLM367, it's OK. I will focus at first on the transistor Q24 by changing it. The second way is to change the LM13600N by a LM13700N.
I'll keep you in touch if I have good (or bad) news.
Lucas
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