| Electronics > Repair |
| KRK Rokit 5 G3 no power to Tweeter, everything else works (No black glue) |
| (1/1) |
| RikRepair01:
Pictures here: https://imgur.com/a/koTptmT Problem: I have a single KRK Rokit 5 G3 Studio Monitor that only plays music through the mid/bass speaker, the tweeter doesn't vibrate at all. I've tested the tweeter both with a multimeter set to Ohm and a 1.0 volt battery and it works. Power supply is delivering the correct voltages and the standby circuit works as intended, when an input is connected the relay clicks and the speaker starts to play music. PCB looks in good condition with no ossidation or burnt spots and the infamous black glue isn't used in this model. When playing music, there is around 2v going into the mid/bass speaker and 0v going into the tweeter. I've tested continuity between the positive wire of the mid bass speaker and the trs jack and I get continuity, if I do the same with the positive wire going to the tweeter I get nothing so there is definitely a break somewhere on the High Frequency side. I've tested continuity between the positive wire going to the tweeter and ground and I get nothing. My next move would be to start removing capacitors and test them with an ESR meter, would that be a good thing to try? I know my way with basic electronic repairs and have done stuff like console modding and swapping bios chips, but I'm new to board diagnostic. Thanks in advance for any helpful tip. |
| beenai2018:
Since its a speaker ,please do the shake and tap test on wires/components ,before removing /checking esr etc. Connect your AC voltmeter to tweeter lines and check if anything changes when tapping the wires ,components etc. Whilst there is no nefarious black glue ,they have used some other translucent glue .. lol .. Also ,try to trace signal path for tweeter from source . This looks like Bi-Amped setup ,so there should be a HP filter opamp (possibly near the yellow rectangle looking caps ) which you can check the output . Check the frequency where the manufacture says they are High Passing between low and high driver . If your multimeter does not have bandwidth in the VAC mode , this test may not work correctly. |
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