Question about Peavey AMPLIFIER, 1000 WPC, DDT, 8/4/2 OHMS => Model PV2000 Car Audio Amplifier

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Peavey CS-800 PA power amp 1 channel is out

Channel ''B'' works fine. Channel ''A'' is out. I have checked virtually every component in channel ''A''. I have test equipment. I have compared resistance and diode meter readings between the good and bad channels I have been an electronics tech for over 30 years. This one has me stumped. The -85V is low at about -55 volts only on the bad channel. I have a schematic, but I can't figure this one out. I have meters, a scope, and also a curve tracer. I have metered all the output transistors - they checked good...someone has replaced 2 of the output transistors previously as they are not the same as the others. Channel ''B'' ' s outputs are all the same like the majority of the parts in channel ''A''. I am hesitant to swap the outputs or the driver boards as I am afraid to damage anything in the good ''B'' channel therefore losing my ability to compare 1 to the other...I have about 10 or 12 hours into this now and I am about to return it to the owner and tell them I can't fix it. any help is greatly appreciated Thanks Bill

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  • billmorris52 Jan 26, 2009

    Hello: I am trying to fix this amp myself. I do not want to have to pay others to fix it as it will probably cost more than it is worth. Do you have any knowledgable electronics technicians that know this amp or have I wasted 10 bucks with fixya ? Thanks Bill

  • billmorris52 Jan 27, 2009

    OK: The voltages are now reading the same. +76.5
    and -76.5 volts...using your idea of an overheated component I found that Q6 on the bad channel which is the negative predriver transistor is getting very hot. The same transistor on the good channel is not. The voltages are all wrong in that area too...
    The Schematic I have is a bad copy made a while back. You can obtain a copy from Peavey usually within 2 business days via a request tohttp://www.peavey.com/support/contactinf...
    ask for the old madel CS-800 thats' what this
    is...the original model ( probably 20 years old or more) Thanks Bill. In the meantime I'll take out Q6 and test it. If bad I will replace it....

  • billmorris52 Jan 27, 2009

    As I said in my original post. I have tested all of the output transistors ( all 12 of them)
    on my curve tracer in the bad channel....they all check good to beyond their rated voltages...so I don't think it is the finals....Q6 predriver is hot and nothing else...will remove Q6 and see whats up there and report back in a day or 2. Thanks Bill

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I Have a CS800 with one side that was intermittant - found the solder joints cracked around the pins on both back side circut boards where the input and output jack are soldered in- input jack connection would open up and drop audio to that side.

Posted on May 04, 2013

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If you have unbalanced speakers, you will usually blow out an output transistor. You need a transistor tester to verify this. Make sure you have EXACTLY the same impedance on both sides of the output.

Posted on Jan 27, 2009

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Try to reinstll

Posted on Jan 27, 2009

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For all the details with diagrammattic designs and repairing procedure of cs-800.click the the link below and check out step by step metod of amp repairs.: http://www.amprepair.com/peavey.htm
rate the solution if it helps you fix your problem.thanks

Posted on Jan 27, 2009

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As the amplifier needs to be opened with a proper tools and checked with he meter to locate the faulrty ic or capacitor.as it will be bulged or leaked.

Posted on Jan 26, 2009

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One of the Amp channels is out because one of the power transistors on the amp final is gone.

Test the transistor and replace it.

See: Sci.Electronics FAQ: Repair: Power Amps Repair

Posted on Jan 26, 2009

  • Ginko
    Ginko Jan 27, 2009

    If you have tested all trans, and there is no audio on one channel, then test the controls circuit (balance). Test also output from preamp.

    More the schematics you need to get from Pewey a full service manual with troubleshooting diagrams, as this is no common problem.

    You can download free schematics here To download the file, please, click here !, but that is probably what you already have.

    Get full repair manual from Pewey.


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Hi and welcome to FixYa,

For the -85 to read only -55 would indicate that one of the output transistors has a leak and is loading the power supply. You can verify this be feeling which one is heating up even with no input signal. Since it would be a matched pair, then both outputs of Channel A has to be replaced. Measure the output transistor out of circuit and check collector to emitter to base reverse bias (for leak). Additionally, you may want to check the driver transistors, again for leaks.

Could you post the schematic on a free online file server? Pls post back results. Good luck and thank you for using FixYa.

Posted on Jan 25, 2009

  • Louie  Role
    Louie Role Jan 27, 2009

    Appreciate the update/postback.

    I have emailed to request for a copy of the schematic diagram. Soon as one is available, will postback for more insights.

    In the meantime, pls bear in mind that designs of this period tends to have a "domino effect" that is; if one of the transistor fails, then suspect those before and after it as well.

    Cheers.


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Dear FixYa Customer,

In reference to:
peavey AMPLIFIER, 1000 WPC, DDT, 8/4/2 OHMS => Model PV2000...
peavey CS-800 PA power amp 1 channel problem
listed on FixYa Site.....

I read this review of a new PEAVEY Amp @
http://www.musiciansnews.com/live_sound/49/peavey_pv900_stereo_pro_power_amplifier.shtml

"The new PV Series power amps retain their two-channel design, high power points and exclusive peavey features and technologies—such as DDT compression and Turbo-V Cooling. The PV 900 delivers 300 Watts per side into 4 Ohms, 180 "

This makes me believe they've had problems with the channel on other models like the one your trying to fix!

I'd try them direct at this point in your attempt to fix this problem. It looks like they have a great PEAVEY CUSTOMER SUPPORT SITE which I always say "You Should Call 1st!" @

http://www.peavey.com/support/contactinfo/

Peavey Customer Support Site Listed below:


Customer and Technical Support If you have questions concerning product operation, support and warranty, contact one of our Customer Support Representatives toll free at 877-732-8391, by email at customerservice@peavey.com, or by using our Forums.

Parts Department To order replacement parts, please call us at 877-732-8391 (toll free in the US) or 601-483-5365. The Parts Department extension is 1386. Our business hours are 8 a.m. - 5 p.m. Central Time, Monday-Friday. Hold times may be long during peak hours. If you have to wait on hold, feel free to leave a name and number and one of our Parts Sales Coordinators will contact you as soon as possible. Payment can be made via credit card, or we can ship COD to a place of business only.

For parts pricing and availability inquiries only, email the Parts Department at parts@peavey.com

Pricing In the U.S.: domesticsales@peavey.com
Outside of the U.S.: intsales@peavey.com

Repair Assistance To locate an authorized peavey Service Center near you, click here.

For assistance/status of repairs for peavey products and scheduling factory repair appointments, email repair@peavey.com

Marketing Contact Information To communicate with Peavey's Marketing Department concerning marketing or branding opportunities,
email marketing@peavey.com

Product Development Contact Information To contact the product development department directly,
email productdev@peavey.com

For any comments or concerns regarding existing peavey products, please contact our customer service department,
at customerservice@peavey.com

Your Nearest Dealer In the U.S.: U.S. Online Dealer Locator
In Europe: EU Online Dealer Locator
Outside of the U.S. and Europe: intsales@peavey.com

Human Resources hrdept@peavey.com

peavey.com Website webmaster@peavey.com

Corporate Contact Information International Headquarters
peavey Electronics Corporation
5022 Hartley peavey Drive
Meridian, MS 39305
Customer Phone: 601-483-5365
Fax: 601-486-1278

Europe
peavey Electronics LTD
Great Folds Road, Oakley Hay Corby
Northants NN18 9ET England
Tel: +44 (0) 1536 461234
Fax: +44 (0) 1536 747222
Website: www.peavey-eu.com

Hope this is helpful.

Good Luck!
jackiaria

Posted on Jan 25, 2009

  • Jack Iaria
    Jack Iaria Jan 27, 2009

    Have you tried music-electronics-forum where they have repaired the same problem? They give links to downloading schematics, show photos of the unit and places to order parts!

    The link http://music-electronics-forum.com/showt... will take you directly to info on the amp your going to fix!

    I'd dive in deeper but I must go to work now!



    Knowing YOU CAN FIX THIS!


    jack

  • Jack Iaria
    Jack Iaria Jan 28, 2009

    How you doing with your Peavy Guitar amp repair?

    Please rate me!



    Thanks


    jackiaria

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SOURCE: Peavey PV 8.5C DDT is activated on channel A even

Check your speakers and Cables. I had some speakers that traveled in my small trailer and the vibrations of the trailer caused the diaphram to back off my horns. Once I got the speakers fixed the DDT light on my power amp stopped staying on so much.

Posted on Jan 20, 2010

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You will find it at a small pcb at the back of the amp. Normally it has three legs but the centre is cut away. If it's down you will measure 0 Ohm at the output, also with a switched off amp.

Thats all I can remember, it was about 25 years ago.

Maybe it helps,
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