Question about Sony STR-DB940 Receiver

Open Question

Sony STR-DB940 No output technical question.

I just bought cheaply at an auction a Sony STR-DB940/ FM STEREO/FM-AM RECEIVER. It was touted to be working, and power up is good. Selectors, DSP, Tuner all work and audio is accessible via pre-out (2ND AUDIO OUT).
All output though is dead.
Opening up the unit you I found both fuses (125V 8A) on DC (1) are blown. On replacement they blow immediately. The only output on the board (CNP802) feeds Main Board with B+ and B- 61.1 V. Looks like this is the main amp/ booster that then feeds each bias board.
My question is what would be the best method of fault finding what is shorting out/ loading the circuit? I cannot feed the power the check voltages. Has anyone come across this and got ideas in what could be wrong?

Thanks in advance.

Tim

Posted by on

1 Suggested Answer

  • 163 Answers

SOURCE: Sony STR-DE945 8A 125v fuses

Check HomeDepot they have 7amp , maybe your store has 8amp.

Posted on Dec 18, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Amplifier - TA-AX380; CD Player - CDP-C40; AM/FM Tuner - ST-JX380; FM Stereo/FM-AM Receiver - STR-AV570X, and Stereo Cassette Deck - TC-W380.....all Sony. Very old system, do not have the manuals, they...


Since you have 2 receivers, you can either use the Sony STR-AV570X or the TA-AX380. You will need 3 Stereo RCA Cables to connect your CD Player, Tuner, and Tape Player. The speakers connect to the receiver you choose using the speaker input terminals.

Here is the diagram (click on picture to enlarge):

pctech1_71.jpg

Jun 22, 2011 | Audio & Video Receivers

1 Answer

Is it possible to setup lip-sync on the DB940?


no adjustments in that unit for timing

Nov 02, 2009 | Sony STR-DB940 Receiver

1 Answer

I have a sony str-de335 fm stereo receiver and


This can be shorted output transistors (common) or a defective voltage amplifier IC. WIthout taking measurements inside, there is no way for me to make that determination. In any case, this should be a relatively simple repair for a shop that repairs audio gear. Expect a parts cost in the $25-$40 range.

Dan

Aug 19, 2009 | Sony Audio & Video Receivers

1 Answer

Sony str-db940


Most likely a cold solder joint somewhere in the audio circuit. Most likely on the legs of the relay that turns the speakers on or off. Also check the connections at the audio outputs. Give it a good look over for bad solder connections, given the symptoms that's 98% likely to be the problem.

Oct 06, 2008 | Sony STR-DB940 Receiver

1 Answer

Sony amp str-db940 - protection


Somewhere in your speaker wiring, you have a shorted wire. This short can be as simple as a single strand of wire touching the other terminal on one of the speakers.

With a bright flashlight, look carefully at the back of the receiver and then the speakers for any loose strands.

May 27, 2008 | Sony STR-DB940 Receiver

Not finding what you are looking for?
Sony STR-DB940 Receiver Logo

Related Topics:

261 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sony Audio & Video Receivers Experts

nexrad_chris

Level 2 Expert

117 Answers

Cindy Wells

Level 3 Expert

4757 Answers

Pieter Vleeshouwers

Level 3 Expert

1413 Answers

Are you a Sony Audio and Video Receiver Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...