Surround channels don't worm DE255

SOURCE: no sound out of rear speakers

I don' know what type of system you have, but try to switch system to "SURROUND" mode, or "DSP" mode.

SOURCE: Sound only some out of 2 speakers at a time. I need all 4.

Here you go buddy:
http://www.docs.sony.com/release/STRDE685.pdf

Donald DCruz

• 17130 Answers
• Posted on Oct 07, 2011

SOURCE: I have a Sony DH-810 reciever and 7 speakers (8

Remove power for a while and reset the amplifer, check for any error codes. If you do not have a manual please check the following link for the nearest model. Calibrate and use test tones according to the procedure mentioned in the manual and reset.
If there is no result the sub woofer amplifier is faulty , need to check within for the power supply or there can be a failure within in the driver output.
click this link:
http://www.docs.sony.com/release/HTDDW790.pdf

SOURCE: Speaker Imedance Matching - Sony STR DE 997 receiver with 120Watts - 8 ohms output with Benz 6 ohms..Tower Speakers

hi pawanh75,

thanks in advance for a very informative setup that you have.

Here are some of possible mods , only if you like and can DIY

( or have someone to help you )


• Using a 6 ohms impedance for an 8 ohm impedance amp clearly

denotes that it heats up the output stages.

(please forgive my very technical words)


• One way to lessen the heat is to install a blower .

Use a 220V blower on top of the receiver.

( air should be in going up direction ).


• Before I proceed further please indicate if having the speaker

connected and having a zero volume , and just letting the receiver

in an "On" state deliverately produce heat on the receiver, or just

when the volume is at medium to high level.


If it s running hot at zero level with speaker , please post.

If it is running hot even without speaker, post also


• It may also helps , if you have a powered subwoofer ( for the low's),

and set settings on your receiver to "small"


Let me know what you find to help you further.

SOURCE: Low sound output from Front Speakers

The out put transisters are probally fried for the front channels,