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Re: Sansui 9090DB in protect mode.

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Posted by Fran on July 30, 2004 at 18:32:59:

In Reply to: Re: Sansui 9090DB in protect mode. posted by Chris Seri on May 31, 2004 at 20:48:04:

Wow, I just got a Sansui 9090db from a friend for free. The protect lite was blinking when I got it. I followed Chris's directions to check the 180 ohm resistors on the driver board. They were toast! Ordered a couple and put them in, and wha-la it now pumps out the power! A brick of a reciever but a beauty. I have a G-9700 that I got in 1982 second hand. It was my beast of burden for many years until Dolby Digital / Theater came to being. The 9700 has an intermittent channel distortion problem that I have been chasing for a couple years now. If it distorts bad enough the protect lite comes on that one also. Will look to the driver board again...
Thanks again Chris.
Fran
Thanks Chris!
: : I just purchased a sansui 9090db off ebay.
: unfortunately when powered on it starts up in protect mode with the red light flashing. i can grab FM signals but i can only hear them through the right channel when the volume is turned to max. i replaced the fuse in the back but nothing changed.

: : does anyone know what might be causing this and how to fix it?

: First off;
: You should not hear anything out of any channel if the unit is indicating red in the protect mode. The speaker relay would then not be active and no signal could possibly get to the speakers in that condition. The unit in the protect mode would indicate a problem in the main amplifier section and should be looked over first before going any farther. I am currently looking over this very same unit myself, and in the one I have, the only problem was that one of the 180 ohm fused resistors (R34 or R33 on the F-2624 board) was blown out in the driver board. Check that first.

: Secondly, if the main amplifier section does work and the protection circuit shows a green light and you still get little to no sound, then it is possible that something is wrong with the Dolby board. Best to get the service manual if that is the case because it can get very confusing tracing where signal is getting lost at.

: Good luck
: Chris
:

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: Wow, I just got a Sansui 9090db from a friend for free. The protect lite was blinking when I got it. I followed Chris's directions to check the 180 ohm resistors on the driver board. They were toast! Ordered a couple and put them in, and wha-la it now pumps out the power! A brick of a reciever but a beauty. I have a G-9700 that I got in 1982 second hand. It was my beast of burden for many years until Dolby Digital / Theater came to being. The 9700 has an intermittent channel distortion problem that I have been chasing for a couple years now. If it distorts bad enough the protect lite comes on that one also. Will look to the driver board again... : Thanks again Chris. : Fran : Thanks Chris! : : : I just purchased a sansui 9090db off ebay. : : unfortunately when powered on it starts up in protect mode with the red light flashing. i can grab FM signals but i can only hear them through the right channel when the volume is turned to max. i replaced the fuse in the back but nothing changed. : : : does anyone know what might be causing this and how to fix it? : : First off; : : You should not hear anything out of any channel if the unit is indicating red in the protect mode. The speaker relay would then not be active and no signal could possibly get to the speakers in that condition. The unit in the protect mode would indicate a problem in the main amplifier section and should be looked over first before going any farther. I am currently looking over this very same unit myself, and in the one I have, the only problem was that one of the 180 ohm fused resistors (R34 or R33 on the F-2624 board) was blown out in the driver board. Check that first. : : Secondly, if the main amplifier section does work and the protection circuit shows a green light and you still get little to no sound, then it is possible that something is wrong with the Dolby board. Best to get the service manual if that is the case because it can get very confusing tracing where signal is getting lost at. : : Good luck : : Chris : :

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