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Default Mark Levinson No 27 Problem

I am having intermittant problem with a No27 Levinson.
Breaker trips on front and emits a buzz in speaker on one channel.
When I ramp up with variac to 50v one channel has alot of DC offset
(300mv) and after about a minute it drops to 10mv. At that time I can
continue to ramp voltage up to 120v without tripping breaker. The amp
plays fine after doing this startup procedure. When power is removed it
goes back to the same problem on restart.
Could this be a bad cap? Its difficult to trace because using the
variac seems to temporarily cure the problem before I can start
troubleshooting.

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Mark D. Zacharias
 
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Probably NOT a bad cap - there's probably shorted outputs etc. With
equipment such as Levinson you should really get factory service, or service
from a well-known high-end dealer with a good reputation for this type of
stuff. DIY or shade tree types should be avoided at all costs.

Mark Z.


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I am having intermittant problem with a No27 Levinson.
Breaker trips on front and emits a buzz in speaker on one channel.
When I ramp up with variac to 50v one channel has alot of DC offset
(300mv) and after about a minute it drops to 10mv. At that time I can
continue to ramp voltage up to 120v without tripping breaker. The amp
plays fine after doing this startup procedure. When power is removed it
goes back to the same problem on restart.
Could this be a bad cap? Its difficult to trace because using the
variac seems to temporarily cure the problem before I can start
troubleshooting.



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No shorted outputs, this would be permanent, not intermitent.

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Ofttimes determined hobbyists can do a lot more than most of the
dealers-very few High End dealers have what I would call a serious
service department. In more cases than not they have a bunch of
unworking or out of cal equipment either left over from better days or
bought specifically to impress the clientele or meet a warranty station
MEL. They just ship anythiing not obvious to the factory and pad the
bill.

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Mark D. Zacharias
 
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Sorry, didn't catch that it was intermittent.

mz

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No shorted outputs, this would be permanent, not intermitent.





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Mark D. Zacharias
 
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wrote in message
oups.com...

Ofttimes determined hobbyists can do a lot more than most of the
dealers-very few High End dealers have what I would call a serious
service department. In more cases than not they have a bunch of
unworking or out of cal equipment either left over from better days or
bought specifically to impress the clientele or meet a warranty station
MEL. They just ship anythiing not obvious to the factory and pad the
bill.


Maybe so but many audiophiles would prefer that Levinson waved their magic
wand over the piece.

Mark Z.



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OK,
Got the schematics and bypassed the relay.
Its a short somewhere in the input. With the unit bypassed I get rail
voltage at speaker output but
its not blowing rail fuses.

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[email protected] whoisitreally@gmail.com is offline
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Default Mark Levinson No 27 Problem

I realize this is an old thread. If anyone can email schematics /service manual/PCB layouts it would greatly appreciated. Thank you!
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