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ARCHIVED FORUM -- April 2007 to March 2012
READ ONLY FORUM
This is the first Archived Forum which was active between 17th April 2007 and
1st March February 2012
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Before I started the recap and after I restored power to the unit using the variac, I did have the decimal point on the display. I am trying to decide if I need to replace the four trimmer pots on the 09 Module PCB. The four that are there are nice and shiny (still look new). Of course that doesn't mean they are good but compared to the BM4000 I
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Here is a picture of the recapped 09 module. Next for this board is the four trimmers.
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Here is a picture of one of the bad 100uF polarized caps. They measured too low to check out on my ESR meter so I used the LCR meter and it shows the measured capacitance of close to 2nF ... way off.
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Here is a picture of the bad 47uF bipolar cap.
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The next board is the 09 Module - Output Amplifier. This picture shows the board installed, then removed and the trace side (with the transistors on the heat sink. While doing the recap I measured each capacitor I removed. Unfortunately I first removed the two 47uF bipolar caps as a pair. One of them was bad - measured open circuit but I can't say
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Before I started I did use an air compressor (at low air flow) to get rid of loose dust inside the unit. But overall the unit is extremely clean. I bought the receiver and a couple of other B&O pieces from the seller in person. He was a nice guy and I found out was the original owner. The pieces were always kept in a house so they weren't exposed
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Completed Module 06 recap. I talked to Dillen and concluded that the 22uF (unknown designator) electrolytic cap should be there. I had an extra (new) Nichicon 22uF, 50V cap in my electrolytic supply box so I used it. In the following picture of the completed 06 module it is the little round can below the big C9 capacitor. The little 22uF cap negative
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The next board is Module 06 - Standby Power Supply and Volume Preset In the picture, the large 10000uF capacitor is easily replaced and is the only one for this board in Dillen's kit. The 22uF electrolytic cap is not in the kit and is not in the Beomaster 6000 service manual. I have drawn on the inset picture of the schematic where this unknown
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Here is the finished module 16 PCB recap. Note that there are three old cap mounting points that are no longer used.
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Here is a measurement of the existing module 16 PCB C1 cap (3300uF) and the new, replacement cap.