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 unit....no 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 http://www.givemefile.net/smanuals-page.html
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.