Dismiss Notice

Psst... Ready to join TalkBass and start posting, make new friends, sell your gear, and more?  Register your free account in 30 seconds.

Need help with Carvin R600 (Series II) head

Discussion in 'Amps and Cabs [BG]' started by bholder, Sep 4, 2001.


  1. bholder

    bholder Affable Sociopath Supporting Member

    Sep 2, 2001
    central NY state
    Received a gift from Sire, but not an "endorsing artist".* (see sig)
    I just got a used Carvin R600 Series II head, and I don't have the cabinets yet to hook it up to try it out, so I plugged headphones into the headphone jack, plugged my bass in, and tried it with no speaker load. Something is very, very, wrong; all I got was a very weak, horribly distorted signal. I've been over all of the controls dozens of times, front and back, and don't see anything that would cause or change this behavior. Can anyone help me figure out what's going wrong? Was the amp damaged during shipping?

    Help! :( :confused:
     
  2. Luis Fabara

    Luis Fabara

    Aug 13, 2000
    Ecuador (South America)
    Audio Pro - Ecuador
    0) If your Bass is Active replace the battery with a new one.

    1) Turn Off Compressor, Noise Gate, Biamp, Bridge, Effects Loop, Graphic EQ.

    2) Put the Amp Levels at 0, gain at 0, Volume at 0.

    3) Now set the EQ Totally Flat. 0 Bass, 0 Everything. Also switch the Pre-shape Off.

    4) Select Fully Solid State Mode, no Tube.

    Now plug in your Bass (Either Passive or active, doesnt matter) and begin turning up the gain know until the Clip Light led fires up.
    Now decrease the gain until it dissapears.

    Now Plug the headphones. (Verify them by pluggin into another source. The Headphones must be TRS Stereo if fully inserted, if not.. Insert until you hear just 1 click)

    Now begin turning up the Volume know until you hear a sound.

    Then begin to adjust the rest of settings you like.

    It could have been caused by:
    1) Bad Tube (Check now by blending a little tube , then by using it alone)
    2) Too much Bass, would almost destroy your headpones, so that distortion could be caused by that.
    3) Gain Clipping
    4) Who knows? Hehe

    Please comeback and tell me if you continue having problems.
     
  3. MikeyD

    MikeyD

    Sep 9, 2000
    I'm not sure this is a factor, but the headphone portion of the amp is downstream of one of the bridge contacts. Make sure the bridge switch is off (out) in the back of the amp, and see if that helps.
    - Mike
     
  4. bholder

    bholder Affable Sociopath Supporting Member

    Sep 2, 2001
    central NY state
    Received a gift from Sire, but not an "endorsing artist".* (see sig)
    Well, no luck yet, I've already tried most of these suggestions, but I'll give it another shot, starting over from the beginning.
     
  5. bholder

    bholder Affable Sociopath Supporting Member

    Sep 2, 2001
    central NY state
    Received a gift from Sire, but not an "endorsing artist".* (see sig)
    Arrgh. Went in the exact order specified, tried a couple of different sets of headphones, no change. With any luck, it's only the headphone jack, but still...

    I guess I'd better go after the shipping company for damaged goods.
     
  6. Chasarms

    Chasarms Casual Observer

    May 24, 2001
    Bettendorf, IA USA
    If you bought it used, how do you know it wasn't messed up before it was shipped?
     
  7. snyderz

    snyderz

    Aug 20, 2000
    AZ mountains
    Have you plugged some speakers into it yet? If you don't have a cabinet, use a local store's, or a friend's.
    Doc
     
  8. bholder

    bholder Affable Sociopath Supporting Member

    Sep 2, 2001
    central NY state
    Received a gift from Sire, but not an "endorsing artist".* (see sig)
    Well, I got it on eBay, and the seller had a positive rating, seems like a nice enough and honest guy, but you're right, no real way of knowing (though eBay is pretty strict about bogus sellers). I've contacted the seller already, haven't heard back yet. It was insured, and USPS was the shipper, but the person I talked to at the local post office where I picked it up was already giving me a hard time ("Well, how could it be damaged if the outer carton isn't damaged?" Well, DUH, it says "Fragile" right on it!!!)

    I haven't tried it with speakers yet, I'm going to try it tonight with my stereo speakers patched in (at VERY low volumes), they have decent 15" woofers rated at 100 watts, so it should be ok at least for a quick low volume test.
     
  9. bholder

    bholder Affable Sociopath Supporting Member

    Sep 2, 2001
    central NY state
    Received a gift from Sire, but not an "endorsing artist".* (see sig)
    I got the new speaker cabs tonight, plugged them in, and it's the same problem all over again, only louder. It looks like the amp was damaged during shipping, now that I look at the packing box and such more closely, it sure looks like it was dropped hard on a corner from a fairly good height, by dear old USPS.

    So, luckily it was insured, but it sounds like they're going to be a real pain in the butt about it, I have to take everything down to the local post office tomorrow to file a claim.

    I don't know how they'll handle it, whether they'll pay for repairs or refund the value or what, but as it is, it's a dead loss. So, how do I find out about getting it repaired?
     
  10. Chasarms

    Chasarms Casual Observer

    May 24, 2001
    Bettendorf, IA USA
    Carvin has a one price repair policy. It used to be $159 or maybe $179. That is, you ship them the amp and a MO for $179 and they fix it. No matter what is wrong with it. Whether they solder one wire or replace the entire IC board, it is the same price.

    I would also contact the seller, if he/she still has the receipt, you may be able to get it fixed under warrenty. IF not, it'll cost you.

    Go to http://www.carvin.com to get a toll free number or send them an e-mail. There is also a discussion board at that site. It is full of Carvin homers, but if you post your question, you'll get a straight answer. I think the moderators are Carvin employees.

    You might also ask about how long it takes to get it back. I suspect you'll be without the amp 4-5 weeks.

    Your other option is to look for a local repair shop to fix it. It may cost you a little less, but I would be hesitant. At least you can be mostly confident that Carvin knows what they are doing.

    Chas
     
  11. bholder

    bholder Affable Sociopath Supporting Member

    Sep 2, 2001
    central NY state
    Received a gift from Sire, but not an "endorsing artist".* (see sig)
    Well, I finally got my courage up and opened 'er up. Took a while to figure out how everything came apart, that's ad odd idea of rack mounting (screwed in from the top, the "rackmount" bolts on the front are just dummys bolted on to the faceplate). I wiggled and reseated the preamp tube, and every wire header plug and pluggable component I saw. Nothing had seemed out of place at all, so I didn't have much faith or hope that I'd fixed anything, but when I plugged in and powered on (still with the covers off), it was working just fine, beautiful clear strong bass! Yippee!!

    So now, of course, since I've seen it running with the covers off, I've got another question - there are two leds back on the main power amp board, one for each amp, that were lighting up occasionally, they sure look like clipping lights. Why in the world would they leave the main power amps' clipping light indicators buried inside the box with no indication on the control panel? Seems odd to me, seems like you ought to know if your settings are causing power amp clipping, no?

    Anyway, the most important thing is that it's working now. My first "real" bass amp in 15 years or more.

    - Bill

    :D
     
  12. MikeyD

    MikeyD

    Sep 9, 2000
    Congrats on getting it working! Having courage is a great thing, but be aware that there are dangers in them thar chassis. Unless you know exactly what you're doing, never touch anything while it is plugged in, and be aware that power supply capacitors can still kill you long after the cord is unplugged, unless they are properly discharged.

    I have been inside my R600 II, but I don't recall seeing internal LEDs as you describe. The clipping lights are on the front panel of my amp. If yours are too, then the internal ones might be for use by repair technicians for something. However, I don't recall internal LEDs appearing on my circuit diagram for the amp.

    - Mike
     
  13. Bob Lee (QSC)

    Bob Lee (QSC) In case you missed it, I work for QSC Audio! Gold Supporting Member Commercial User

    Jul 3, 2001
    Costa Mesa, Calif.
    Technical Communications Developer, QSC Audio
    They probably didn't have a good reason to put clip indicators on the circuit board, but then again, those probably aren't clip indicators.

    As Mike mentioned, they might be for diagnostic or QC purposes. But an LED is also an inexpensive way to get a voltage drop of about 1.6 to 1.8 volts in a circuit, so they might not be serving any sort of indicating function.
     
  14. Luis Fabara

    Luis Fabara

    Aug 13, 2000
    Ecuador (South America)
    Audio Pro - Ecuador
    Actually the R600 is a Preamp + a DCM600 Power Amp In one unit.
    The leds you see in there are posibly the standard cliping lights you should see in the front of a DCM600.