FAQ  •  Register   •  Gallery •  Login

It is currently Mon Dec 22, 2014 7:45 am

Help with my MXR-130 Receiver

<<

dennismiller55

Newbie

Posts: 7

Joined: Thu Jun 02, 2011 5:01 pm

Location: Clifton, Maine

Post Sun Jun 12, 2011 4:19 am

Help with my MXR-130 Receiver

I know I have come to the right place. I seek Carver Guru Wisdom.

I have an annoying problem with my MXR-130 Receiver. Occasionally, one of the audio channels will fade to a low volume or just to nothing. Both channels do it randomly. On occasion, both channels will do it at the same time. When it first happened, turning the volume and or balance knob seemed to bring them back. Sometimes you would have to be aggressive in operating the knobs. I took the cover off to access these pots. I sprayed a lot of contact cleaner in the little holes on the pots and operated them while spraying. This seemed to work for a while. But it still does it. Now operating the knobs sometimes works and sometimes not. Turning the unit off and back on does seems to work. I cannot pin point a solution that works consistently. Kind of hit or miss.

So this is what I am thinking now. Could it be the output relays? Or do I have dead spots on the balance or volume knob which would require replacements?

Any help or advice is appreciated and welcome.
<<

helicopterpilotdoug

User avatar

SILVER-7t

Posts: 1986

Joined: Sun Mar 21, 2010 8:04 pm

Location: Austin TX

Post Sun Jun 12, 2011 5:19 am

Re: Help with my MXR-130 Receiver

Hello, and Welcome to the forum! Sorry, I'm not one of the Guru's here, but I'm sure someone will be able to help you soon.
Sunfire: Theater Grand IV, Cinema Grand Signature.
Carver: TFM-45, PST-24 Cassette, Extra Carver Gear: CT-6, C-11 (S/N 00001).
Polk Audio: Mains SRS 2.1TL, Center CSiA6, Surrounds FXiA6 and FXiA4, Sub DSW MicroPro 1000, Extra Speakers SDA 2A, SDA 2Btl, Monitor 10A.
Turntable: Dual CS 714Q
Bluray/SACD: Oppo BDP 83SE
CD: Sony 330 300 Disk changer

http://www.douglasconnection.com
<<

dennismiller55

Newbie

Posts: 7

Joined: Thu Jun 02, 2011 5:01 pm

Location: Clifton, Maine

Post Sat Jun 25, 2011 11:24 am

Re: Help with my MXR-130 Receiver

dennismiller55 wrote:I know I have come to the right place. I seek Carver Guru Wisdom.


Helpful responses to my question are welcome from anyone not just a "Guru".

It is getting worse. I read somewhere (eBay I think), that if this problem presents itself in the speaker but not in the headphones, then it is the output relays. The problem is the headphone volume is so much less than the speakers. The speaker output drowns out any audio in my headphone. If I turn off the speakers and listen just in the headphone this problem does not seem to exist. I will continue this test for a while.
<<

kingman

User avatar

(pair of) SILVER-7 TUBE AMPs

Posts: 5774

Joined: Sun Nov 30, 2008 2:10 pm

Location: Upstate South Carolina

Post Sat Jun 25, 2011 12:43 pm

Re: Help with my MXR-130 Receiver

Dennis...I have no idea...I would say spray it down inside with de-oxit making sure you get all the pots. If that doesn''t help it's time to think repair work. Are you equipped to troubleshoot this project? If not...several can help.
In reality, it only matters what it sounds like to YOU!!!
<<

jjptkd

User avatar

SILVER-7 TUBE AMP

Posts: 2904

Joined: Wed Sep 22, 2010 4:50 pm

Location: Snohomish, WA

Post Sat Jun 25, 2011 12:44 pm

Re: Help with my MXR-130 Receiver

Welcome! Old unit, probably needs servicing. Send it to Bob Carver's Audio Repair Center for refurbishing and have him sign it for you while its there. Good luck!
Sunfire TGP-III
Sunfire 405x5
PS Audio DL-III DAC
Klipsch Chorus II's
Klipsch RSW 15
Klipsch KW-120 (2)
<<

dennismiller55

Newbie

Posts: 7

Joined: Thu Jun 02, 2011 5:01 pm

Location: Clifton, Maine

Post Sun Jul 03, 2011 10:20 am

Re: Help with my MXR-130 Receiver

Good News! I have fixed my own problem. It was both the left and right channel output relays. I thought I remembered reading about this problem somewhere. As it turns out there is a Service Bulletin that addresses this very problem. Also there is someone selling replacement relays on the big auction site. Delivery was quick. It was an easy solder job. Not only is the intermittent problem gone, the audio is clear. I don’t have the best ears anymore so I guess I did not realize how much distortion was also present.

Now I am happy.
Last edited by dennismiller55 on Sun Jul 03, 2011 3:31 pm, edited 1 time in total.
<<

engtaz

User avatar

"TAZ"

Posts: 5254

Joined: Sat Jun 30, 2007 1:43 pm

Location: Tampa, FL

Post Sun Jul 03, 2011 10:33 am

Re: Help with my MXR-130 Receiver

Congrats on the fix.
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
<<

kingman

User avatar

(pair of) SILVER-7 TUBE AMPs

Posts: 5774

Joined: Sun Nov 30, 2008 2:10 pm

Location: Upstate South Carolina

Post Sun Jul 03, 2011 1:53 pm

Re: Help with my MXR-130 Receiver

That's great!!! Enjoy the music!!! =D>
In reality, it only matters what it sounds like to YOU!!!
<<

dennismiller55

Newbie

Posts: 7

Joined: Thu Jun 02, 2011 5:01 pm

Location: Clifton, Maine

Post Tue Sep 27, 2011 5:39 pm

Re: Help with my MXR-130 Receiver

Now I have a differnt problem. Well, I guess it has always been there. I just could not hear it at low volumes which is my norm. There is a constant hum, both channels.

Could this be the power supply capacitors. I am sure replacing all the electrolytic would remove the hum and improve the overall audio quality.

What do you think?

Dennis
<<

kingman

User avatar

(pair of) SILVER-7 TUBE AMPs

Posts: 5774

Joined: Sun Nov 30, 2008 2:10 pm

Location: Upstate South Carolina

Post Tue Sep 27, 2011 6:09 pm

Re: Help with my MXR-130 Receiver

Check the ground loop. If you have it plugged into a power strip bypass and plug into the wall. Anything else plugged into the wall outlet besides it? :-s I am assuming 2 prong plug..... :-s
In reality, it only matters what it sounds like to YOU!!!

Return to CARVER Equipment Repair/Help Forum

Who is online

Users browsing this forum: No registered users and 2 guests

Powered by phpBB © 2011 phpBB Group.