Basically, all Harman Kardon amplifiers (including subwoofers) show power supply issues after a few years
Posted by jpluimers on 2019/07/26
Experienced first hand myself, all my Harman Kardon amplifier equipment (including subwoofer) have shown power supply issues after about 2 years of use.
Signs are devices not powering up any more, giving only a limited amount of power (for instance a subwoofer only blinking the power led), or intermittent shutdown failure (more often when it is warmer than 22 degrees Celsius).
There are companies making a living of just these power repairs (for instance Audiocare.nl who git all my defective equipment to work again for about EUR 100 per device: [WayBack] Harman Kardon – AudioCare.nl).
This is how you remove the power supplies:
- [WayBack] Uitbouwinformatie Voeding Harman Kardon BDS275 – 277 – 575 – 577 – AudioCare.nl
- [WayBack] Harman Kardon BDS270-570 uitbouwinformatie! – AudioCare.nl
- [WayBack] Uitbouw SUB-module – AudioCare.nl
The biggest issues are failing capacitors, and glue becoming conductive.
Related blog posts:
- Fix Apple TV No Sound Issue – AppleTV2
- Packet Sender is a good tool when debugging protocols: free utility to send & receive network packets. TCP, UDP, SSL
Some videos below the fold.
–jeroen
The Wiert Corner - irregular stream of stuff 
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