Hello, been struggling with this receiver.
It did some relay clicking some months ago (back channel lost for seconds), but clicking stopped. After that working fine.
I purchased new speakers (Boston Acoustics), and for the first time used the SUB PRE OUT for an active sub. Worked fine. For one week.
In the middle of a tv program suddenly came loud, audible hum from the sub woofer. As the sub was new, I thought I had a faulty unit.
But after some troubleshooting, I narrowed the problem down to the old receiver. Please correct me if Im wrong, from the following symptoms:
* Loud audible hum and little bleed in from the selected channel on tv
* Rest of the receiver and sound from the subwoofer working fine (also sub channel)!
* Most audible when active sub is turned all the way up
* Still audible when volume on receiver is turned all the way down
* Moving sub and receiver to a different room/outlet: Hum still audible
* Different RCA cable: hum still audible
* Removing all input cables from receiver/shutting tv, blu-ray off: hum still audible
* Pulling cable from tv / shutting of tv: makes a difference in hum.
* Changing RCA from SUB PRE OUT to CENTER/FRONT PRE OUT on the receiver clearly ELIMINATES HUM
* Selecting "Sub woofer: NO" in setup (a relay clicking) ELIMINATES HUM
Heres some more intensive testing:
* Sources with DD-logo (Dolby) (eg. specific channel on tv) CLEARLY has more hum than channels with no DD logo
* Shifting source on front on receiver makes kind of an echo in the hum, clearly audible in the sub woofer
I tried open up the unit, but couldn't see any visible sign of bad caps or bad solders.
I have fair solder capabilities, but no testing gear besides a battery driven hand multimeter.
Repair manual for the unit HERE.
The unit is worth much less than what repairs would cost in my country, and I dont want to toss an otherwise perfectly working unit.
Really hopefull that anyone in here have the knowledge to point directions of something to exchange.. Thanks a lot, guys.
It did some relay clicking some months ago (back channel lost for seconds), but clicking stopped. After that working fine.
I purchased new speakers (Boston Acoustics), and for the first time used the SUB PRE OUT for an active sub. Worked fine. For one week.
In the middle of a tv program suddenly came loud, audible hum from the sub woofer. As the sub was new, I thought I had a faulty unit.
But after some troubleshooting, I narrowed the problem down to the old receiver. Please correct me if Im wrong, from the following symptoms:
* Loud audible hum and little bleed in from the selected channel on tv
* Rest of the receiver and sound from the subwoofer working fine (also sub channel)!
* Most audible when active sub is turned all the way up
* Still audible when volume on receiver is turned all the way down
* Moving sub and receiver to a different room/outlet: Hum still audible
* Different RCA cable: hum still audible
* Removing all input cables from receiver/shutting tv, blu-ray off: hum still audible
* Pulling cable from tv / shutting of tv: makes a difference in hum.
* Changing RCA from SUB PRE OUT to CENTER/FRONT PRE OUT on the receiver clearly ELIMINATES HUM
* Selecting "Sub woofer: NO" in setup (a relay clicking) ELIMINATES HUM
Heres some more intensive testing:
* Sources with DD-logo (Dolby) (eg. specific channel on tv) CLEARLY has more hum than channels with no DD logo
* Shifting source on front on receiver makes kind of an echo in the hum, clearly audible in the sub woofer
I tried open up the unit, but couldn't see any visible sign of bad caps or bad solders.
I have fair solder capabilities, but no testing gear besides a battery driven hand multimeter.
Repair manual for the unit HERE.
The unit is worth much less than what repairs would cost in my country, and I dont want to toss an otherwise perfectly working unit.
Really hopefull that anyone in here have the knowledge to point directions of something to exchange.. Thanks a lot, guys.
