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Home Theater/Onkyo HT-R520 & 530


Lee wrote at 2007-06-16 21:04:09
Another thread on this same problem indicated that they came back from the factory with the diagnosis "bad choke".  I assume this is a bad RF choke- but have no schematic.  My 520 just crapped out with same diagnosis- all menus work, no sound.  OK mains with signal generator.  I am going to buy schematic and look for a choke first.  Sorry could not be more specific

cinsug wrote at 2008-03-04 03:43:35
Found one of the choke on the main logic board from 7805 to a component under soldered-on heat sink is open. The failed component looks like a choke coil with 2R2 marking on it.

Matt wrote at 2009-02-10 01:19:42
I have the same exact problem with my sound output except from the tape output. Cinsug, I don't understand what you're saying. Can you please explain more.

Guest wrote at 2009-11-16 22:58:34
L7002 was the dud. Check all the choke coils on the preamp board with a DVM for open (blown) coils. L7002 appeared to be the only open coil (infinite resistance) on my board.

Service Manual on Page 85 defines L7002 as: "NCH-1471" PN: 231237M022R2 OR "NCH-1587-022k" PN: 233533K022R2

You can find the same part on the headphones board. I don't use headphones, so I pulled it off the headphones board and soldered to the L7002 spot and it started working again..

OhOneWS6 wrote at 2010-09-11 15:07:08
Thanks for the tip on the L7002 choke location.  Like you I have never used the headphone jack. I just performed the same swap and my receiver is fixed.

Alan wrote at 2011-03-16 22:16:25
I just replaced the L7002 with a short piece of wire. I think it's only there for interference suppression, so no big deal. Tested and it works great. Also I found the service manual for free download at

Mike wrote at 2011-06-08 20:50:37
Same exact problem, same exact fix. Thanks a lot.... :)  

Upandrunningagain wrote at 2011-11-20 03:20:33
L7002 - nice find!  Mine quit about 3 months ago, I've had it for about 5 years - love the system.  Figured my kids toasted the amp listening to bassy music when I was at work - nope.  L7002 was the problem - removed it and replace with jumper - working like new - thanks for sharing!!

SD_Dude wrote at 2012-02-19 00:31:12
I have the same issue with my Onkyo TX-SR502. I have located the appropriate L7002 coil but I could not find headphone board. There are two other coils "2R2" on same board but these are not labeled L7002. How do I jump this with wire? Just solder any wire on two sides of L7002 or is it of specific gauge? Thanks.

Sandoz wrote at 2013-03-06 00:07:43
Thanks for the info guys! I had the same Onkyo HT-R520 problem (power w/o sound), and successfully pulled the L7002 coil, replaced it with the pulled headphone L7503 coil and jumped the L7503. Back in business! Looks like the current replacement coil p/n is 231237K022R2 (which I could only find via Encompass Parts Distribution). Much gratitude.

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Dave Hathaway


Questions about any aspect of Home Theater Systems including video-- TV and projectors, projection screens, High Definition Television ,audio/video receivers, DVD, speakers and placement, wiring, Satellite TV systems. Familiar with all these areas from the operating priciples, system design and installation viewpoints.


Electronics engineer with 30 years experience, own a small Home Theater Business and do custom installs of Home Theater, Dish Network Satellite, Surround Sound systems, TV antennas, plus commerial and industrial satellite and TV distribution systems.

BS Physics and Mathematics

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