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m500-t blown drivers!need help!

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raikkonen

Newbie

Posts: 7

Joined: Wed Apr 18, 2007 11:07 am

Post Fri Apr 24, 2009 8:50 am

m500-t blown drivers!need help!

hi guys,
a friend gave it to me, i have the schematics, but a little help would be nice... :-k
the drivers near the power transistors, 2sa1111 and 2sa2592, are exploded. really.
then many resistors are burned...
i can tell you the resistor number in the next days, but i'd like to know if someone else experienced something like this, what hould i check and/or change and how to proceed...
thanks a lot in advance!
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BillD

User avatar

(pair of) SILVER-7 TUBE AMPs

Posts: 7295

Joined: Wed Jun 06, 2007 8:29 pm

Location: The west's most mid-western town, Scottsdale, Arizona

Post Fri Apr 24, 2009 9:53 am

Re: m500-t blown drivers!need help!

Sometimes it's a cascading problem, a resistor here, a rectifier there and pow. With my M-500, I was loosing a rectifier in the feedback loop that controls the power rails. The voltage would just keep creeping up. The first thing it did was take out the caps (they were old and weak). I recapped the whole unit, and still had a problem, but the caps were strong enough to get me through the troubleshooting. You might give RichP714 a call (or PM), as he's the expert on the M-500(t) as well as the M-1.0t.
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
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Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, M-400 (2), C-500, M-500, M-500t, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr.)
Sunfire:Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer
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raikkonen

Newbie

Posts: 7

Joined: Wed Apr 18, 2007 11:07 am

Post Fri Apr 24, 2009 10:05 am

Re: m500-t blown drivers!need help!

thanks BillD,
i'll start changing some old caps, this is for sure!
then whe have to change blown transistors and resistors, but i'm not sure if i have to change also power transistors and how to test the power supply.
Maybe i'll send a pm to Rich, to see if he can give me a hand...
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birdyman

Newbie

Posts: 21

Joined: Sun Apr 26, 2009 7:52 pm

Post Sun Apr 26, 2009 8:37 pm

Re: m500-t blown drivers!need help!

Before you power up recheck your bias trim pot to at least middle position or minimal position to avoid blowing power transistors or local bias transistors and voltage control trim pot to minimum voltage. If you do not have Variac, you shoud connect 60~100w bulb to power cord( in serial of course) at NO speakrs or loads connected to it. 60w bulb will slow your unit from get ready even if it is ok. So wait few seconds to verify working condition of unit. Hope this helps

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