Harrison type "K4000" (K 4000) MKII 2x1000W/4ohm

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I have found additional types of this brand:
"K-3000" (K3000, 2x650W/4 ohms) and "K-5000" (K5000, 2x250W/2 ohms)
perhaps the schematic of this could be helpful. But also about this models I find schematics

Here some images of this amps
http://cgi.ebay.co.uk/-HARRISON---K...temQQimsxq20091124?IMSfp=TL091124182003r30366
(Ebay Item number: 110461123841)
http://cgi.ebay.co.uk/Harrison-K200...emZ260515163322QQcategoryZ68247QQcmdZViewItem
http://www.lss-showtechnik.ch/html/asound.htm
(Ebay Item number: 260515163322)
 
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I have found new informations:
about the German topic
Huch, jemandem auf die Füße getreten? Sorry.... - Elektronik
from the German forum "Spotlight wissen de"
was mentioned, that about the no longer exist dutch topic
http://www.heuff.nl/discus/messages/17/161.html?1142187472
from the dutch forum
http://www.heuff.nl/
the member Mr. Roland Huisman had perform a "reverse engineering" of this power amplifier and thus have his own created schematic.

Because one of the members here know the currently weblink of this mentioned topic or Mr. Roland Huisman itself

Thank you for additional hints
 
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I have heard, that the models K3000 and K2000 (K 3000 K 2000) uses the same driver board in surface mounted design than the model K4000. Therefore also this schematic diagrams are helpful - I think.
 

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  • Harrison K3000.jpg
    Harrison K3000.jpg
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  • Harrison K2000.pdf
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  • Harrisom K2000 back.pdf
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  • Harrison K3000.pdf
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  • Harrison K3000 rear.pdf
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Now I have heard, that the voltage gain/driver unit was bought by an other brand and was built in the same solder technology (not circuit topology) than Sanyo's STK modules respective the ICEpower modules from Sanyo/B&O.
This could be the reason, why the schematics not available by this two companies:
http://www.soundservicesni.co.uk/hh_amplification_history.htm
http://www.majelectronic.co.uk/

Now the next step must be to find out the name of this brand to ask there to a schematic.
If I have the schematics at least of this modules (made not only for Harrison - I think), I am happy.
 
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Hello Andreas,

I have my own drawn schematic of the MK-II version.
This means the limiters and drivers are no longer ceramic boards.
These gave many problems.

But the MK-I and MK-II schematics are the same.
When I'm at home I will sent you this schematic.

I'm new here on this forum. I I can help somebody else
with this schematis I will post it here.

Greetings, Roland Huisman
 
Hallo Roland,
thank you very much for sending your own create schematic. I have translate it in "circuitmaker". Unfortunately some values I read wrong or I don't read regarded the not perfect resolution.
If you have time, you can check my PDF schematic in the attachement.

Additional the circuit isn't easy to understand, because the output stage works as voltage gain and current gain stage at the same time. This provides the advantage, that the front end don't need high supply voltage (in this case here only +/- 15V).

I will order the faulty exemplar from an user in my aera for repair next week. I hope, now I can perform the faultfinding and troubleshooting with help of this schematic.
 

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  • C ...-A-Harrison K4000.ckt.pdf
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Hi Guys!

I'm a proud owner of a couple of K3000's and K4000's.
We are having trouble with one K4000: one output is producing rubbish when fed a small signal.
I narrowed it down to the small board with SMD components.

If I understand previous posts correctly.. this board only houses the limiter?
I studied the schematic from Roland Huisman, posted by tieffbass.. Is the double-lined box where this board was originally located?
This schematic shows only an opamp in the box.. so I presume this is a diy built replacement board?

Thanks!
 
Here now the complete schematic of K3000 (not K3000-II) created by two device, that I have for service, with mainboard PC20007 ISS4 and serial number 17768 resp. 8111. (the K4000, that I revceive in two weeks uses the same main- and front PCB numbers). Follow modules in the two K3000 devices are inside:

1) VU-Meter Modul 2x:
MH 1483/8 (painted blue) resp. CD20012/2 C9329 (Thick Film Processing)
2) Limiter-Modul 2x:
/4-3 MH-1484/F 9108 (painted blue) resp. LCD4020/1 C 9318 (also Thick Film Processing)

From the VU module (log scaling) I haven't find out the internal schematic.
From the Limiter module I assume the values from Mr. Roland Huisman's schematic. Mr. Roland Huisman wrote, his own modules uses pertinax/epoxy instead ceramic. In my devices are ceramic in use. Perhaps anybody can give me an advice, whether there are anywhere replacement modules in pertinax/epoxy version available.

By simulation I have already find out, that the circuit design (especially the stuff for compensation to avoid oscillation) isn't carried out by CAD.
I not also, that on the blue painted version is a DIP8 OPA instead a SO-8 - so as additional soldered capacitor of 47pF - certainly not performed by a service center.
This means, the next step is the redesign (CAD supported) for stable behaviour and reliable operation under all "real life" conditions.
 

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  • C ...-A-Harrison K3000.ckt.pdf
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  • C ...-A-Harrison Modul Kx000.ckt.pdf
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