I have a CAV-180 which has had an intermittent problem for several years, and now seems to behave more consistently: whenever the amp has been powered on for 15 minutes or more one of the channels cuts out completely, no sound or distortion. All other channels behave fine. If I turn the amp off for an hour or so and then turn it on that channel will work perfectly for the next 15 minutes, then turn off. I presume the problem has something to do with the temp of the unit when it has been on for awhile but would like anyone's expert help if this can be repaired at home or I need to ship it off.
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Genuine and consistent random flashing is normally a cable fault if is the main VU graph but there are other symptoms as well. If is the O/l (Clip) or Solo Leds on a channel strip have you checked for earth loops etc? Does it do it all the time or only when there's a signal? Which Leds are flashing and is there anything else that is not behaving correctly? It would seem if you can get a repair shop to have a look this would be your best bet.
have this amp, had this problem, had to crack it open to re-solder the RCA input jack as the soldered mount connections failed. Seems like the issue was the input spiking when those connections moved around, or it was caused by poor connection between the mosfets and heat-sink(causing near-instant overheat condition). There are 4 or 6, don't remember. They were attached to 2 slide rail looking pieces of aluminum that fit in the shell. I broke them free (as it made the job faster) and reattached with minimal heat-sink compound. Thing runs like a champ now. Get another 20 years out of it.
The amp is protecting itself from something either real or perceived by the protection circuitry. Check your speaker impedances to make sure they are all what they are supposed to be (IE, 4 or 6 or 8 ohms depending on the speakers and arrangement). Feel the amp to see if it's warmer than it should be - blow any dust out of the heatsinks. when it cuts off, try spraying freeze mist on the components until it turns back on and behaves - accurate use of freeze mist can diagnose a thermal problem easily. Look for bulging or leaking capacitors anywhere in the circuity. Failing that, it'll have to go into a shop.
turn that ****** on and get a can of freeze spray. coming and going type issues is usually related to a failing electrolytic capacitor. there may also be a bad mosfet, rectifier, diode, etc. i would be suspect to caps. schematics probably only available thru crate and you have to pay a couple bucks, but trust me its worth the couple bucks spent and having it on its way than wasting hours online not getting anywhere. by the way i checked my sources and came up with nada. yostamplifier.com