Problems with CSV 510
I mean only the electrolytic caps. Yes, bad caps or defective transistors can be the cause. Before you replace C609/709 have them tested, they are pretty expensive. Can you test the output of the pre-amp, oscilloscope would be best?
Wilhelm
If you can, check also the four big emitter-resistors R619/621/719/721 0.22ohm.
Wilhelm
If you can, check also the four big emitter-resistors R619/621/719/721 0.22ohm.
You can check the resistors the same way. Because of the low resistance of .22 Ohms you probably don't get the exact reading with your Multimeter, but a comparision of the four readings should give you a good idea.
084/085 is correct. When you measured the voltages did you disconnect the pre-amp from the power-amp? If not, disconnect and measure again.
Wilhelm
084/085 is correct. When you measured the voltages did you disconnect the pre-amp from the power-amp? If not, disconnect and measure again.
Wilhelm
....maybe the easier way for you to check the pre-amp is switching the red and yellow wires (left/right) and see whether you get the same signal strength on the good channel of the power amp. If you get the same volume your pre-amp seems to be okay. Make sure that the controls on the front panel are set to the same values for left-right.
now I've tried to switch 084 and 085 but it's still the same channel that's not working. So I guess this means it is the power amp that's broken?
On the emitter-resistors I get the same reading on all 0,1ohm
If I replace the capacitors are these good alternatives? (all have the same capacity and voltage as original)
C707/C607 and C702/602 http://dk.rs-online.com/web/search/sear ... &R=6283863
C705/C605 http://dk.rs-online.com/web/search/sear ... &R=5261828
C703/C603 http://dk.rs-online.com/web/search/sear ... &R=6842043
I cant find a suitable replacement for C709/C609 (80v 300uf)
Are there more capacitors I should replace?
On the emitter-resistors I get the same reading on all 0,1ohm
If I replace the capacitors are these good alternatives? (all have the same capacity and voltage as original)
C707/C607 and C702/602 http://dk.rs-online.com/web/search/sear ... &R=6283863
C705/C605 http://dk.rs-online.com/web/search/sear ... &R=5261828
C703/C603 http://dk.rs-online.com/web/search/sear ... &R=6842043
I cant find a suitable replacement for C709/C609 (80v 300uf)
Are there more capacitors I should replace?
...now you have eliminated one source that could have caused the problem. It is time to check the transisitors and the diodes, either by comparing the voltages from the left and right channel or desolder them and check them individual. Because you have only a Multimeter for testing here are two links telling you how to test semiconductors.
http://www.testingelectroniccomponents. ... KgodTRRBBg
http://www.electronics-radio.com/articl ... r-test.php
Regards
WIlhelm
http://www.testingelectroniccomponents. ... KgodTRRBBg
http://www.electronics-radio.com/articl ... r-test.php
Regards
WIlhelm
I'm pretty sure that at least one of the 2n3055 transistors are broken since it conducts all ways and between all legs and the "shell"
should I replace all of them? and is this a good replacement?
http://uk.rs-online.com/web/search/sear ... &R=4864476
should I replace all of them? and is this a good replacement?
http://uk.rs-online.com/web/search/sear ... &R=4864476
No problem with the the replacement (link). If you are not 100% sure whether the second one is okay, replace it too. What about the driver transistors BD139/140 in front of the 2N3055's? By the way, the "shell" of the 2N3055 is the Kollektor and it must be properly isolated from the heat sink. You can check this with your multimeter. Don't forget the heat sink paste!
You are making good progress.
Regards
Wilhelm
You are making good progress.
Regards
Wilhelm