Harman Kardon HK980 pre- and power-amp separating

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YSDR

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Joined 2013
#1
Hello!

I have an H/K HK980 integrated amplifier, I would like to connect it directly to its power-amp, but it doesn't have such an input, so I thought that if I pull the signal cables that comes from the pre-amp and goes to the power-amp, then by routing them out, there will be a direct power-amp input. Yes, but if I pull-off the signal cables that going to the power-amp (that is, the +/- cables that only carry the sound) from the pre-amp, the entire amplifier is turned off with the keyword "protect".

What could be done about it? Mainly, I mean that the pre-stage part would perceives it as if the power amplifier is connected to it (to not go into protection). Sorry if the question is trivial!
 
#3
Amp board input is CN1 ( see attached)
Service manual is here --https://www.manualslib.com/manual/1197642/Harman-Kardon-Hk-980-230.html
 

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#5
I have done something similar with an HK vxi550. In my case I input directly into the preamp board as most modern amplifiers still have/need a gain stage. My hacking removed tuner, phono, volume, tonal control and balance making it a pretty normal easy to drive power amp.
 
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#6
Thanks for all the replies! It seems keeping the ground wire connected between the pre- and power-amp solved the problem, it works like a charm and my NAD C510 DAC/"preamp" can drive the HK980 power amps to max output easily.
Thanks again!
 
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