Question about Amplifiers & Preamps
TOOK THIS TO A LOCAL TEC. AND WAS TOLD THAT THE PROTECTOR CIRCUIT WAS BAD AND THAT IT WAS A FACTORY FIX.. WHEN TURNED ON THE LIGHT COMES ON AND THEN BLINKS RAPIDLY BUT THE SYSTEM DOES NOT START. I KNOW THE UNIT USE TO CLICK WHEN THE LIGHT WENT OUT. COULD THE SWITCHES BE BAD OR IS IT THE CIRCUIT PRIOR TO THE SWITCHES. I HAVE A SCHMETIC OF THE AMP BUT IT WON'T TROBLE SHOOT. ANY HELP WOULD BE APPRICIATED. THANKS DG
The D11 is a complex amp in its circuitry. It employs Sansui's x-balanced system. You need to clean the output relays and check the offset and bias (a multi-step process that is not possible without the service manual).
Posted on Dec 14, 2008
It is possible, but nlikely that the protection circuit is bad. More common are shorted output transistors or defective driver stage transistors. This should not be a difficult repair for anyone familiar with audio amps. Unsolder/remove Q22 and Q23 and measure the voltages at each of the 3 pads per transistor and post them here.
Posted on Nov 05, 2008
Tips for a great answer:
Oct 28, 2013 | AKG Hearo 999 AudioSphere II Amplifier
Aug 27, 2010 | Amplifiers & Preamps
Jun 21, 2010 | Amplifiers & Preamps
Jun 11, 2010 | Amplifiers & Preamps
Mar 11, 2010 | Amplifiers & Preamps
Feb 09, 2010 | Amplifiers & Preamps
Jan 19, 2010 | Amplifiers & Preamps
Nov 17, 2009 | Amplifiers & Preamps
933 people viewed this question
Usually answered in minutes!