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Old 3rd December 2014, 09:06 PM   #1
jlk is offline jlk  Denmark
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Default Bias adjustment Harman Kardon HK990

Hi, I have a HK990 and need to control/adjust bias settings.

Does anyone know how to do this (where to messaure and how) ?

The service manual is a little tricky to understand and this message How to bias HK990 don't point out exactly how to do.

Best Regards
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Old 6th December 2014, 10:10 PM   #2
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The alignment instructions are flawed. Look at the power amplifier schematic. That one pretty clearly calls for 38 mV between TP4 and TP6 (or TP3 and TP7, TP2 and TP6, or TP1 and TP5).
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Old 8th December 2014, 11:18 PM   #3
jlk is offline jlk  Denmark
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Quote:
Originally Posted by sgrossklass View Post
The alignment instructions are flawed. Look at the power amplifier schematic. That one pretty clearly calls for 38 mV between TP4 and TP6 (or TP3 and TP7, TP2 and TP6, or TP1 and TP5).
Thank you very very much for your reply

But do I have to messaure specific on the TP points ?

The TP points are very hard to get to (need to dissambly alot to get access) or is it good enough to messaure directly on the legs on the resistors who is sitting next to the TP points as shown in the service manual on page 109 ?

Best regards
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