Help needed on testing a Rotel RX-400

woostersoz · 13th November 2007, 06:46 AM

I purchased a Rotel RX-400 receiver - when I plug it in, nothing happens, no lights, no output. So, I lifted the covers and started poking around with my DMM. What I have found so far :

(a) The power cord is fine because the 120 VAC is coming through into the power supply

(b) The transformer looks OK because I measured the output and found it in the range of 12 VAC. I am assuming this is OK.

Now, I am stuck - I have no idea what to look at next. The AC fuses are fine (measured the resistance across each of them and they are not open).

I have the schematic that I am happy to email to anyone who volunteers to help me understand what items to test next

Thanks

destroyer X · 13th November 2007, 07:49 AM

if you try to motivate us will be easier.

Post the schematic, or better, the power part of the schematic...post images, pictures from the amplifier/equipment insides.

Doing that will be easier, as you will atract more people because of the pictures, because of the schematics and because your friendly behavior.

We are fanatics, that kind of guys that cannot watch an amplifier alike normal people...we want to open, to inspect inside...so...give us this kind gift that will produce for you a nice image and will result in fast return related the things you ask for.

I cannot speak in the place of others...but in my perception, the way you entered is:

Do for me
Help me
Teach me

And that will provide schematic (the gift for us) to the one will help you.... can be made in better way..reason why my suggestion to you

and you gave not "food for fanatics"....no picture, no detail.... you know...honey for bees...bond for dogs...those things.

Here is my suggestion to you.... give some...you will receive enormous return.

Images can be jpeg, gif, pdf files and many others you will see during the attachment the instructions...limit is 1000 by 1000 pixels of data and cannot be bigger than 100K

regards,

Carlos

gni · 13th November 2007, 10:35 PM

+/- 12 VAC rectified and ready for use should give a little
more than 30wpc. Seems reasonable.

DC voltage after the rectifier?
DC offset?
Bias current?

Let's see the schematic and some pics. . .they would be helpful.

13th November 2007, 06:46 AM	#1
woostersoz diyAudio Member Join Date: Oct 2007	Help needed on testing a Rotel RX-400 I purchased a Rotel RX-400 receiver - when I plug it in, nothing happens, no lights, no output. So, I lifted the covers and started poking around with my DMM. What I have found so far : (a) The power cord is fine because the 120 VAC is coming through into the power supply (b) The transformer looks OK because I measured the output and found it in the range of 12 VAC. I am assuming this is OK. Now, I am stuck - I have no idea what to look at next. The AC fuses are fine (measured the resistance across each of them and they are not open). I have the schematic that I am happy to email to anyone who volunteers to help me understand what items to test next Thanks

13th November 2007, 07:49 AM	#2
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	For sure you will have a lot of folks helping you...but, if you try to motivate us will be easier. Post the schematic, or better, the power part of the schematic...post images, pictures from the amplifier/equipment insides. Doing that will be easier, as you will atract more people because of the pictures, because of the schematics and because your friendly behavior. We are fanatics, that kind of guys that cannot watch an amplifier alike normal people...we want to open, to inspect inside...so...give us this kind gift that will produce for you a nice image and will result in fast return related the things you ask for. I cannot speak in the place of others...but in my perception, the way you entered is: Do for me Help me Teach me And that will provide schematic (the gift for us) to the one will help you.... can be made in better way..reason why my suggestion to you and you gave not "food for fanatics"....no picture, no detail.... you know...honey for bees...bond for dogs...those things. Here is my suggestion to you.... give some...you will receive enormous return. Images can be jpeg, gif, pdf files and many others you will see during the attachment the instructions...limit is 1000 by 1000 pixels of data and cannot be bigger than 100K regards, Carlos __________________ Try to build an amplifier folks ... it is pure adrenaline!.. when not work first time, then becomes a nice challenge...and we usually overcome the trouble... and we feel very well to be mastering the machine.

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13th November 2007, 10:35 PM	#3
gni diyAudio Member Join Date: Sep 2006	+/- 12 VAC rectified and ready for use should give a little more than 30wpc. Seems reasonable. DC voltage after the rectifier? DC offset? Bias current? Let's see the schematic and some pics. . .they would be helpful.

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