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Bose 1800 series VI Pro amplifier not turning on & Peavey PVi 3000 no output
Bose 1800 series VI Pro amplifier not turning on & Peavey PVi 3000 no output
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Old 22nd October 2019, 02:57 PM   #11
amplidude is offline amplidude  Denmark
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Do check the bose for shorted outputs
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Old 22nd October 2019, 04:21 PM   #12
StewartH83 is offline StewartH83  England
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Thanks guys.

I don't have the dim bulb tester yet. I just wanted to check if there is anything obvious and got a bit carried away. Definitely shouldn't have. I'll stop till I get the DBT.

The Peavey had terrible solder joints done by the last guy in here. Seems the regulator was only on two pins, broken badly, I did try resolder it but it made no difference. I'll have to repair the joint completely when I get the DBT.

On the Bose I did get continuaty on the output transistors. I am guessing it's something to to do with the triacs

Thanks again for your help and guidance. I'll be back when I get my DBT.
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Old 22nd October 2019, 04:39 PM   #13
turk 182 is offline turk 182  Canada
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that's clear evidence of bad solder joints!!!!


and not really the fault of the last guy in there....
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Old 22nd October 2019, 05:05 PM   #14
StewartH83 is offline StewartH83  England
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You're right again sir. He may not of touched it to be fair.

I can't preach when I ain't be doing things correctly, with no DBT.

Other joints were sloppy yet I can't blame the guy beforehand.
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Old 22nd October 2019, 05:08 PM   #15
StewartH83 is offline StewartH83  England
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Pictures don't show them clearly tbh
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Old 22nd October 2019, 05:18 PM   #16
turk 182 is offline turk 182  Canada
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stress fractures from thermal cycling are inevitable the ones that occur from transportation (and like much pro gear it's moved long before it's adequately cooled ( as in "i got the money for the gig let get out of here, there's cool beers waiting at home")are caused by mechanical shock.


try checking things over with a magnifying glass, that could be quite revealing!

Last edited by turk 182; 22nd October 2019 at 05:24 PM.
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Old 22nd October 2019, 07:14 PM   #17
StewartH83 is offline StewartH83  England
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I didn't realise that. Thanks for that info as it's good to know and makes a lot of sense.

I've order the DBT with extra 100w bulbs for spares. I used to have one with a scope (which I never got round to using) but didn't take them with me when I left the ex, she deserved a form of wave anyhow, testing a different kind of broken board.

The regulator heated up well so could this be the problem? Broken solder joint.

I thought it was the volume pots at first but it's not a static or popping sound, just distortion particularly in low end and sound goes in and out. I'm thinking that's because there's not enough power getting to the power amp boards.

Also one of the big 10k filter caps is slightly bulged than the other. I'm thinking that's why there's a little buzzing on the transformer.

When it's fixed I was planning on testing all the caps and replacing the ones testing bad. Now thinking of recapping the psu when I get it out with Panasonic caps.

Thanks for the tips, I'll magnify the joints when I get it back out.
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Old 23rd October 2019, 02:13 PM   #18
indianajo is offline indianajo  United States
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You need to measure the DC voltage on rail caps as you turn up the volume with a load on speaker terminals. I use 10 ohm 450 W (series 2 ea. 5 ohm 225 W) resistors I got from a surplus house (apexelectronics.com apexsurplus.com) but a cheap junkyard 4 ohm speaker will also work. If voltage sags as you turn up the volume, the problem is in the power supply. Use 2 clip leads, never use 2 hands measuring voltage with power on. No jewelry either.
Rail caps can limit output wattage themselves due to high internal resistance, but usually don't cause distortion, just a polite sound with no volume changes. An analog VOM on AC volts 20 or 50 can measure music coming out, P=(V^2)/Z where P is rated wattage of the amp and Z is rated impedance of the speaker/load resistor. Less wattage on speaker than the rating is a bad sign of rail caps.
distorted sound at higher volume sounds like bad solder joint or bad crimp on the flag terminals. Crimp terminals can be re-squeezed. use Klein or Ideal tool for decent results.
I found a 100 W bulb to have too much resistance for a 1300 W Peavey amp. The op amps wouldn't operate. Series the AC input I used a resistor bank from a 1500 W room heater (120 vac) with a bad tip-over switch. It conveniently had flag terminals on it. Kept the dodgy (not shorted) output transistors from blowing the tops when they shorted.
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Last edited by indianajo; 23rd October 2019 at 02:22 PM.
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Old 23rd October 2019, 04:53 PM   #19
StewartH83 is offline StewartH83  England
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Great advice indianajo, well appreciated.

I use a junk full range driver I use for testing things first. I will get some big resistors as well as other test equipment as I seem to be repairing /restoring alot of amps now.

I can't find the schematics or service manual for the Peavey PVI 3000. I wanted to check the levels when I'm done with it.

I don't have any spare resistor banks spare I don't think and would take more time to get some delivered. Will a lower wattage bulb be better? I can get them easily down the road

Great advice on the filter caps. I've only witnessed some were faulty when I had humming on an amp and changing them got rid of the hum.
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Old 23rd October 2019, 05:23 PM   #20
indianajo is offline indianajo  United States
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Quote:
Originally Posted by StewartH83 View Post
I don't have any spare resistor banks spare I don't think and would take more time to get some delivered. Will a lower wattage bulb be better? I can get them easily down the road
Lower wattage bulb is worse for high wattage amplifiers. You might be able to get a 5-10 ohm high wattage resistor with an in cup tea boiler, or an electric tea kettle. But you'll have to keep water in them to keep the element from burning out. Our dollar stores & resale shops do not have tea boilers of any kind. Tea comes in gallon plastic jugs now, pre-brewed. !@#$. Dead room heaters can be found here on the side of the road on garbage day, but Germanic countries tend to be strict about keeping dead appliances in the same cans food waste & wrap goes in.
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Last edited by indianajo; 23rd October 2019 at 05:25 PM.
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