Hi,
I fixed one of these the other month, seems to be a common problem with switch-mode power supply capacitors failing, resulting in the sub not powering on or 'clicking' - PSU tries to start then shuts off.
I used a Philips LCR meter to measure capacitors in circuit, for capacitance and D (tan theta). The following ones below marked (*) were deemed duff and replaced:
PSU/power PCB caps:
Mains cap 560uF 400V. Measured 466uF D=0.2
C70 10uF 35V. Measured 5.5uF D=1.4 (*)
C72 10uF 35V. Measured 8.7uF D=0.5 (* - marginal and in a critical part of PSU)
C44 22uF 35V. Measured 14uF D=0.4
C33 22uF 35V. Measured 16uF D=0.3
C29 22uF 35V. Measured 13uF D=1.2 (*)
C27 22uF 35V. Measured 13uF D=1.5 (*)
C28 22uF 35V. Measured 7uF D=1.1 (*)
C15 22uF 35V. Measured 17uF D=0.2
Preamp PCB caps:
C53 22uF 35V. Measured 14uF D=0.2
C53' (not on PCB, glued to C53, unable to read case). Measured 10uF D=0.5, assume OK
C34 10uF 35V. Measured 10uF D=0.3
C24 10uF 35V. Measured 11uF
C32 22uF 35V. Measured 18uF
C7 10uF 35V. Measured 12uF
C52' (not on PCB, glued to C52, unable to read case). Measured 29uF D=0.3, assume is 33uF so OK.
C33 10uF 35V. Measured 11uF
C25 220uF 25V. Measured 195uF D=0.3
Powered on all fine again.
HTH,
John
I fixed one of these the other month, seems to be a common problem with switch-mode power supply capacitors failing, resulting in the sub not powering on or 'clicking' - PSU tries to start then shuts off.
I used a Philips LCR meter to measure capacitors in circuit, for capacitance and D (tan theta). The following ones below marked (*) were deemed duff and replaced:
PSU/power PCB caps:
Mains cap 560uF 400V. Measured 466uF D=0.2
C70 10uF 35V. Measured 5.5uF D=1.4 (*)
C72 10uF 35V. Measured 8.7uF D=0.5 (* - marginal and in a critical part of PSU)
C44 22uF 35V. Measured 14uF D=0.4
C33 22uF 35V. Measured 16uF D=0.3
C29 22uF 35V. Measured 13uF D=1.2 (*)
C27 22uF 35V. Measured 13uF D=1.5 (*)
C28 22uF 35V. Measured 7uF D=1.1 (*)
C15 22uF 35V. Measured 17uF D=0.2
Preamp PCB caps:
C53 22uF 35V. Measured 14uF D=0.2
C53' (not on PCB, glued to C53, unable to read case). Measured 10uF D=0.5, assume OK
C34 10uF 35V. Measured 10uF D=0.3
C24 10uF 35V. Measured 11uF
C32 22uF 35V. Measured 18uF
C7 10uF 35V. Measured 12uF
C52' (not on PCB, glued to C52, unable to read case). Measured 29uF D=0.3, assume is 33uF so OK.
C33 10uF 35V. Measured 11uF
C25 220uF 25V. Measured 195uF D=0.3
Powered on all fine again.
HTH,
John
Hi John;
I replaced the five caps marked by * and WOW!! My sub works again!
Thanks so much for the post.
And yes that solder is horrible, with the exception of the caps, the pcb is almost a non-serviceable unit (at least by me)
Thanks John and all at Diyaudio, Peter
I replaced the five caps marked by * and WOW!! My sub works again!
Thanks so much for the post.
And yes that solder is horrible, with the exception of the caps, the pcb is almost a non-serviceable unit (at least by me)
Thanks John and all at Diyaudio, Peter
Thanks Peter, glad you got your sub working again. A small caveat, a year later (so 2018) I got the sub back again from its owner, wouldn't turn on again, this time I couldn't find any faulty caps so I couldn't get it working a second time.
Regards,
John
Regards,
John
Hello everybody!
Help me please! My Paradigm Ultracube 10 subwoofer has a burned out power supply. I want to install a new one. What is the supply voltage (2x50? 2x60? 2x70?) What is the voltage? thanks in advance
Help me please! My Paradigm Ultracube 10 subwoofer has a burned out power supply. I want to install a new one. What is the supply voltage (2x50? 2x60? 2x70?) What is the voltage? thanks in advance
Information about Ultracube 10 subwoofer
If still applicable: I might be able to help to repair your Ultracube 10. Currently I am trying to repair my Ultracube 10 myself, so I can measure / lookup values if you want. This one has suffered from an indirect lightning strike, so also the power supply (a.o.) was blown here..
I am still looking for the schematics, they would really be helpfull. I've replaced a couple of components (including some of the SMD opamps), measured / verified correct functionality of some components (like the MOSFETs) but it still does not work. I hope that I do not have to replace everything...
If still applicable: I might be able to help to repair your Ultracube 10. Currently I am trying to repair my Ultracube 10 myself, so I can measure / lookup values if you want. This one has suffered from an indirect lightning strike, so also the power supply (a.o.) was blown here..
I am still looking for the schematics, they would really be helpfull. I've replaced a couple of components (including some of the SMD opamps), measured / verified correct functionality of some components (like the MOSFETs) but it still does not work. I hope that I do not have to replace everything...