Hi there. I'm new on this forum but I'm finding it hard to locate info on the web. I have been repairing an HK Lucas impact which had a fault inside the quadamp metal box. I've tracked down that problem but in the meantime my kid has fiddled with the 5dip switches in the red block. I can't recall how they were set so I'm wondering if anybody has photographed one of these to see how to set them. Any help would be very much appreciated
Thank you so much buddy. This really is very much appreciated. As soon as I get this back together and tested properly I'll post info on the fault and it's cure if it's any use to anyone. I couldn't find any info on the circuit in the quad amp - been having to reverse engineer it as I've gone along.
Sorry, service data does not exist, and will never be released by HK. All switching amplifier modules are serviced an an exchange basis only. I doubt it is possible to reverse engineer it, as they used to use epoxy encapsulated modules for the sensitive parts (when I used to service them).
I did ask them why they would not release service data as I could have serviced them at a much lower cost than the exchange cost. I was told "they are not serviceable as they use surface mount components" was the answer. So does the rest of the world I replied; no answer.
I did ask them why they would not release service data as I could have serviced them at a much lower cost than the exchange cost. I was told "they are not serviceable as they use surface mount components" was the answer. So does the rest of the world I replied; no answer.
The one I've got here is not protected with such measures. The only SMD in there is on a daughter board that handles the audio path and driving of the fet driver ICs. The fault I had is in the audio path on the daughter board which turned out to be a duff tl074 quad op amp.