Proton D940 Repair

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pasaarun

New Member
Folks,
I am a newbie here at the forum. I have used the forum a lot to get reviews on electronic equipment. I recently purchased a Proton d940 from ebay which was doa. I observed that there was a lot of hum and hiss whether I try the amplifier or the preouts by themselves. I found out that the 4700 uf, 50v power supply caps were bulging. I am trying to replace them and while I'm at it, I was going to see whether I could replace the filter caps which are 10000 uf, 80v.
I was going to buy the nichicon/panasonic ones from digikey, then I realized that the original ones are 4 pin/lead/terminal caps. Can i replace the 4 lead caps with 2 lead ones. I was not able to see anything on mouser or on digikey site made by pan/nichicon with 4 lead that are not sold in bulk. Thanks.
 
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Do I just insert the two leads in to the positive and negative holes in the pcb and leave the holes for the other two alone? Also how does a snap in cap work. Do I just push it in the hole and does it snap on and I solder it?. I am not able to find a video or info about how to solder a snap in cap. Thx.
 
You might want to be concerned with pin spacing, diameter and the height of the replacement caps. If you can measure the distance between the 2 of the 4 pins that are used, the diameter and the height of the original cap, the replacement would fit nicely. If the new caps are too tall, or too wide, they won't fit. Also if the pin spacing on the new caps are wrong, the cap won't fit in the circuit board. What you can do is use one of the unused holes and then attach a lead to the pin and jumper it to the other hole.

Snap in caps. have leads that are curved. This allows the new cap to stay in the holes so that it can be soldered. Not needed, but they work. Standard pins will just fall off when you turn the circuit board on it's side to solder them.
 
pasaarun said:
Do I just insert the two leads in to the positive and negative holes in the pcb and leave the holes for the other two alone
Click to expand...
Most of the time the other two would be unused. But I'd want to verify the " not used" pin locations are indeed Isolated and "not used" on any circuit. Looking at the solder side of the PC board.
 
bradfro said:
You might want to be concerned with pin spacing, diameter and the height of the replacement caps. If you can measure the distance between the 2 of the 4 pins that are used, the diameter and the height of the original cap, the replacement would fit nicely. If the new caps are too tall, or too wide, they won't fit. Also if the pin spacing on the new caps are wrong, the cap won't fit in the circuit board. What you can do is use one of the unused holes and then attach a lead to the pin and jumper it to the other hole.

Snap in caps. have leads that are curved. This allows the new cap to stay in the holes so that it can be soldered. Not needed, but they work. Standard pins will just fall off when you turn the circuit board on it's side to solder them.
Click to expand...

Some creative fabrication may be required as well. Have fun :biggrin:
 
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