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Repairing Bose Gold AmplifiersSent: Tuesday, June 05, 2001 8:38 AM To: Allen Woolley Subject: RE: [VN] Bose Gold Amps Hi Allen, Here's a copy you can put it up if you like. Since it is small I have emailed to many people. The more money we can keep from going to Bose the better. Bose Gold Amp Repair for Amps that die from bad Capacitors (heard as popping or squealing noises through the speakers. The front and rear amps are the same except that one capacitor is not used at one end (so if it is not there don't replace it. :) All Capacitors are electrolytics. High temp caps are best but not necessary. As always, higher voltage for the capacitor is better but the physical size increases with voltage rating so make sure it will fit the space. 16 volts is minimum for the 12 volt car system give you a 25% safety margin. Keep the Microfarads (uf) the same. Note the polarity of the cap that you remove and replace with another with the polarity the same way. You can use a second amp as a sample or do one cap at a time. You can buy the parts many places but see if you have an electronic parts warehouse in the area that sell parts cheap. I paid about $0.10 average per cap where Radio Shack (Ripoff Shark) wanted a dollar each. Procedure: 1. Remove the speaker. 2. Open the speaker and remove the amp. 3. Remove the metal cover from the amp. 4. Remove the hot glue from the components on the board: Needle nose pliers work but this is the hardest part of the job, pull off little pieces a little at a time. If you happen to break a cap just replace it. I have successfully used Exacto knives to remove glue such as this in the past. - AW The ceramic disk capacitors are the only ones that are really vulnerable. They are 104 value which, if I remember right, is a .1 uf at 25 volts. 5. Remove C150 and C16 which are 1 uf 50v caps and replace with new ones. 6. Remove C3, C31 and C2 which are 10 uf 16v caps and replace with new ones. 7. Remove C203 which is a 4.7 uf 35v cap and replace with a new one. 8. Remove c19 and C25 which are 1000 uf 16v caps and replace with new ones. 9. Replace the metal cover on the amp. 10. Replace the amp in the speaker and close the speaker. 11. Replace the speaker. |