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Schematic for Parasound Zamp ver 1
Schematic for Parasound Zamp ver 1
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Old 12th April 2018, 02:13 PM   #11
AlexRivera is offline AlexRivera
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That definitely looks like a DIY mod, mine doesn't have any of those.

I had the same problem with a big resistor (blue in this case) being un-soldered from the board but still making contact with the circuit, but that was on the headphone output circuit board.
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Old 15th July 2018, 10:39 AM   #12
Black Stuart is offline Black Stuart  France
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Thinking of buying a new one at a reasonable price - are there reliability issues with this amp?
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Old 15th January 2019, 01:37 PM   #13
bullittstang is offline bullittstang  United States
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Schematic for Parasound Zamp ver 1
Thought I would post here first to see if there are any responses.
I recently moved so I pulled this back out of the closet to see if I can get this running for an office system. Original issue - with a DBT the relay would click in and out every 1/2 second. I tried with 25, 40 and 60w bulbs and the only difference is the speed of the clicking and with a 60w bulb the power transistors would start to heat up.

First thing I did was pull all transistors and test with a DMM and a transistor tester (from eBay) and only found one bad small signal transistor and replaced it with a suitable replacement (c639, with a leg-adj., reversed C2240) for now and will get a correct one once it is back running.

I put all the small-signal transistors back in the PCB, but left out the driver/power transistors to do some testing.
Current issue is -
Left channel 220r resistors (R225/R227) in-front of 0.22r emitter resistors are getting quite hot - small amount of smoke with a 60w bulb in the DBT.
I took some voltage readings and show ~30vDC on those resistors.
The other interesting thing is that I get ~28vDC on the Collector and 24vDC on the Emitter of the power transistors, but when the relays clicks out of circuit (takes 5-6 minutes with the drivers/power Transistors removed) I get -5vAC on the Base and Emitter, but still have 24vDC on the Collector. Not sure what that tells me/you if anything.
If AC is getting through, does that mean a Capacitor is bad? They look OK, no bulging or leaking, but I haven't tested them out of circuit.
I don't have, and cannot find a schematic - so I'm a little lost on verifying resistor values and mainly checked for reasonableness and that none were OL, and I have not found any that seem out of spec.
Included a few pictures in hopes that will assist. Thanks.
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Old 24th February 2019, 02:37 AM   #14
williakz is offline williakz
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Join Date: Jan 2015
I was just given one of these today (original Zamp, not V2 or V3). Reportedly, it has a high-pitched noisy output (or something like that, not sure the user is very reliable source of info). Popped the unit open, and everything looks (and smells) just fine. I'll power up (DBT) this weekend and see what I can find out. Perhaps we can compare notes as we each go along to figure out what, if any, "mods" were made after the fact(ory). Good luck to both of us!
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Old 14th January 2020, 05:32 PM   #15
AlexRivera is offline AlexRivera
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Location: Texas
I finally got this little Amp on the bench and got it fixed, now I understand why this go bad... Man they run HOT

I have had this one running for a bit over an hour and the heat sink has some parts as high as 81 degrees Celsius, about 182 degrees Fahrenheit.

I have seen some post online about users saying that V1 of this amp runs really HOT but I didn't expect it to be this HOT, what's your experience??
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Old 14th January 2020, 06:13 PM   #16
Charles Darwin is offline Charles Darwin  United Kingdom
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Join Date: Nov 2009
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I've got two of them, a V1 and a V3.

Fantastic little amps and I also got them dirt cheap, 80 for both off ebay a few years ago.
The V1 is my computer amp and is permanently switched on.
It does not get hot at all. My landline phone sits on it blocking a few vents and the case gets barely warm. Never opened it up.
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Old 14th January 2020, 06:29 PM   #17
AlexRivera is offline AlexRivera
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Join Date: Jan 2017
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Quote:
Originally Posted by Charles Darwin View Post
It does not get hot at all. My landline phone sits on it blocking a few vents and the case gets barely warm. Never opened it up.
Interesting!!

I wonder what makes some different.
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Old 14th January 2020, 07:27 PM   #18
Charles Darwin is offline Charles Darwin  United Kingdom
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Not a clue.

May be it is load dependent. As far as I know my speakers are a fairly easy 8Ω load.

Just a guess. I don't even know enough about the inside of amps to be dangerous...
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