Re: HK Citation 19 amp hum r.side? what to look for
RESOLVED:
In the end I had to return it and the guy accused me of changing out the power caps! This after he'd supposedly purchased it from some scientist. When I replied "oh then so you DID open it before!" that was the end of ever hearing from him again.
You guys were SO helpful I couldn't let it pass without a final thank you! Took me years to do it but I never forgot any of you.
Richard
psycom
Member
Last Activity: 05-29-2014, 04:18 AM
Joined: 02-13-2011
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Re:parts have been replaced before
Thanks for the offer to help. I'm still trying. have the driver board off and see that Q5 has been replaced. What is that used for? P2 pin #1 looks odd... sticky stuff around it on the pcb.Before I got that far I took off the heat sensor and did some more cleaning all around tightening things down and last check the front LED light is getting steadier.
Bought the cleaners you suggested and am going to clean things up better and hit some points with the iron. Reassemble and see what happens.
Ebay settled...Leave a comment:
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this thing sucks. blew a speaker I'm pissed
Well I put signal into it and had a barely audible sound. Tried a different signal and never heard squat but it toasted my speaker!
Hooked up a 100 watt guitar speaker to it and it's buzzing like at first w/o an input. Put it in bridge mode and it has a hum to it.The "burnt out Led" (r) is still flashing away. shut it off and it nearly blew that speaker with the big old POP. It quit doing that until it tried to process a signal. Now it's back to the way it was.
This is bullshit. I contacted ebay....Leave a comment:
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Right LED is now flickering...
The dead right LED began flashing a little bit ago.
It's connected to the thermal circuit breaker and when tripped that LED is off and so is the power to that side... supposedly. It's trying to come back on but hasn't hit full glowing status yet.
Checked the voltage readings and tried to adjust via VR1 but never hit 77ma unless I take one leg from the VR1 and go to one leg or R5 then I can get it adjusted correctly.
slight buzz still in right channel but none when bridged. The light is trying to tell me something....Leave a comment:
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Progress.... gettin better
Kaboom... did what you suggest and ALL the diodes look fine. I sprayed down everything, cleaned those board connections... repeatedly too, both of them.
The shaping boards are intact with no signs of anything ever happening.
Powered back up and did the routine speaker check.... still just a slight buzz on the right side like after all the excitement but nothing like it was. It was LOUD before. This is like idle or interference noise such as what you hear from a fluorescent light but it's NOT that or both channels would do...Leave a comment:
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Re: HK Citation 19 amp hum r.side? what to look for
OK... I see what you're getting at. I can do that. But remember I said I had hooked that board back up and after the fiasco it settled down.
But I understand what you're saying. Just didn't read it closely as its late. Thanks a million for the advice! And as far as how things looked... nothing appeared bad anywhere. I am familiar whit what failed or failing parts look like. I've fried a few things in my day.
I had no fear... but then I drank a lot back then. It was easier!
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Re: HK Citation 19 amp hum r.side? what to look for
the smoke was at the speaker connector.. the negative one. that black knob looked like it was turning white!
but what's weird is that it "seems like" it cleared up. After all that snap crackle and pop, a puff of white smoke like loads of current trying to make it down that tiny wire then it settled down. haven't been back to try anything new . Like hooking up a mixer and sending an audio signal into it and seeing ... well lets rephrase that.... HEARING what happens. I've "seen" enough.
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Re: update... smoke, white heat and quite
I'll try that idea but when i was looking to short the input i opted to [B]disconnect the pcboard from the input[/B] instead, hooked up a speaker and turned it on.... not a peep, no buzz. i shut it down, plugged the board back in and turned it on
I began hearing snaps, crackles, pops and other noises but it started to calm down then got distracted by the negative speaker output or my crimp connection seemed to be getting white. Like white hot?
[B]looking closer the smoke made me think it wasn't normal[/B]
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Re: HK Citation 19 amp hum r.side? what to look for
Thanks. Will get to that 1st. Luckily i have [URL="http://www.loringllc.com/ebay/CitationNineteensm.pdf"][B]Service Manual[/B][/URL] which always helps. need to look for the points your referring to as it has a bridge mode. haven't gon into that yet but have [URL="http://www.loringllc.com/ebay/CitationNineteenUser.pdf"][B]Users Manual[/B][/URL]
Not sure if it'll do it in bridge mode. Need to check that as well. Could be how seller tried it and had noise slip by him? We'll see.Re: HK CitationLeave a comment:
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Read this update
UPDATE Couldn't edit original. sorry
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I began checking caps on each side and got about the same reading. started with continuity and here's where it fails. Although the leads for the left going under the chassis (Pink & White) give my a complete circuit the same test on the right is dead. Each board where the leads connect are mirror images of each other. Tabs E1 (+53v) and E3 (-53v) on the left side have continuity but the right board does not. C9 has continuity on the left but not on the right.
after I disconnected E1 on...Last edited by psycom; 02-13-2011, 06:12 AM.Leave a comment:
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HK Citation 19 amp hum r.side? what to look for
Hey folks, I recently purchased a Harmon Kardon Citation Nineteen Power Amp off eBay which was suppose to be "perfect" and isn't. Initial tests shows left side quite and seems perfect BUT right side has a "hum" or 'buzz' also has a small "pop" when powering down (left side was silent) and the channel indicator light is out.
I do believe the amp works. only tested with a cheap speaker and a set of rca patch cables. At first I thought the left side was bad as i had no sound but a buzz out of the right. Being a live sound audio engineer w/lots of studio...
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