EEVblog Electronics Community Forum

Electronics => Repair => Topic started by: feedback.loop on December 24, 2017, 12:20:18 am

Title: Harman Kardon AVR 235 receiver repair
Post by: feedback.loop on December 24, 2017, 12:20:18 am

This Harman Kardon AVR 235 receiver had no output. The problem was traced to a shorted ceramic capacitor in the power supply, which resulted in two blown fusible resistors. The process of investigation might be of interest to you.

https://youtu.be/JS9_3qPIn6Y (https://youtu.be/JS9_3qPIn6Y)

Service manual: http://www.vintageshifi.com/repertoire-pdf/pdf/telecharge.php?pdf=Harman-Kardon-AVR-235-Service-Manual.pdf (http://www.vintageshifi.com/repertoire-pdf/pdf/telecharge.php?pdf=Harman-Kardon-AVR-235-Service-Manual.pdf)

Title: Re: Harman Kardon AVR 235 receiver repair
Post by: karyuudo on March 09, 2019, 11:57:09 pm

Appreciate the video.  This helped me repair my AVR 354 today.  I believe these units all have the same faulty issue.  In my case, replacing the 2 fuses F110, F111 (2.5A/250V) with 3.15A/250V fixed the issue - even though visibly there appeared nothing wrong with them.