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M500 intermittently drops the right channel.

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engtaz

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"TAZ"

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Joined: Sat Jun 30, 2007 1:43 pm

Location: Tampa, FL

Post Sun Nov 15, 2009 7:57 pm

M500 intermittently drops the right channel.

M500 intermittently drops the right channel. Could someone give me starting points for following thru the circuit to troubleshoot it.

Many thanks,
engtaz


Carver M4.0T in front channels to Caver AL VI's in SACD & 2 Channel setup
C 16, PT 2400, Slim Device, Carver TX-8, 490T and Rega TT w Grado Gold cart in the 2 channel setup
Bogen SRB20 is computer amp
Carver PM-350 donated for youth church use
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BillD

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(pair of) SILVER-7 TUBE AMPs

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

Post Sun Nov 15, 2009 9:14 pm

Re: M500 intermittently drops the right channel.

Gonna be hard to diagnose when it's intermittent. You probably need to wait until it fails solid to track it down. Is there some way you can make it fail consistently?
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
_________________
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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engtaz

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"TAZ"

Posts: 5230

Joined: Sat Jun 30, 2007 1:43 pm

Location: Tampa, FL

Post Mon Nov 16, 2009 4:42 am

Re: M500 intermittently drops the right channel.

No consistantly. Sometimes when it goes down its down up to 5 minutes then on then off again.
engtaz


Carver M4.0T in front channels to Caver AL VI's in SACD & 2 Channel setup
C 16, PT 2400, Slim Device, Carver TX-8, 490T and Rega TT w Grado Gold cart in the 2 channel setup
Bogen SRB20 is computer amp
Carver PM-350 donated for youth church use
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Jag_97470

SILVER-7 TUBE AMP

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Joined: Fri Sep 19, 2008 12:06 am

Location: Oregon

Post Mon Nov 16, 2009 10:27 am

Re: M500 intermittently drops the right channel.

I would check tax records, sounds like your house was built on top of a graveyard? :shock:
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F1nut

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SILVER-7 TUBE AMP

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Joined: Tue Nov 11, 2003 3:31 am

Location: The Mars Hotel

Post Tue Nov 17, 2009 8:00 pm

Re: M500 intermittently drops the right channel.

Roy, check for a cold solder joint. That is, any solder joint that isn't shiny or looks funky should be touched up.



I would check tax records, sounds like your house was built on top of a graveyard?


Hehe....
Political Correctness...defined

A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.



In a recent press conference, President Obama remarked, "If I had a city, it would look just like Detroit."
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BillD

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(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 Tue Nov 17, 2009 8:23 pm

Re: M500 intermittently drops the right channel.

Good call, Jesse. I just had an M-500t that I was working on that went bad for no apparent reason. It was a cracked solder joint.
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
_________________
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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engtaz

User avatar

"TAZ"

Posts: 5230

Joined: Sat Jun 30, 2007 1:43 pm

Location: Tampa, FL

Post Sat Nov 21, 2009 1:27 pm

Re: M500 intermittently drops the right channel.

Thanks guys. I am looking for schematics for the M500, are they the same as the M500t. As a tech I tend to look before I leap.
engtaz


Carver M4.0T in front channels to Caver AL VI's in SACD & 2 Channel setup
C 16, PT 2400, Slim Device, Carver TX-8, 490T and Rega TT w Grado Gold cart in the 2 channel setup
Bogen SRB20 is computer amp
Carver PM-350 donated for youth church use
<<

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 Sat Nov 21, 2009 2:01 pm

Re: M500 intermittently drops the right channel.

They are somewhat the same, but the M-500 has a couple of quirks. There's those little boxed daughter boards (two of them IIRC). One is the phase network and the other is the voltage regulator (both in the power supply). Nothing in the phase network of concern, but the voltage regulator has a bunch of caps in there. See below. Both boards were eliminated on the M-500t (parts became part of the mother board). There are some other parts on the M-500 that are missing on the M-500t, like the inductors on the amplifier board, and a network that may or not be there, based on the particular build of the M-500 that you have.

Here's the voltage regulator daughter board that was a real pain to work on. It is soldered to the mother board on risers that are also conductors.
M-500 daughter board.JPG
M-500 daughter board.JPG (159.52 KiB) Viewed 480 times
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
_________________
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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