Fspatola

CTS4200a dead

13 posts in this topic

Hi all, I am working on a CTS4200a that will not power on. I found C13, C15 & C16 buldging on the LV module. I am going to do a recap on the whole LV module. I was wondering if there is anything eles I should check before trying to power it up. I have checked the diodes and transistors. This is my first time working on a CTS amp. Any help would be appreciated.

Thank You, Frank.

Share this post


Link to post
Share on other sites

Hello Frank,

Replace the LVPS! Don't try to fix the psu, it's not worth it. The LVPS is quite inexpensive. Also, ask Crown for the firmware update...

Alain

Share this post


Link to post
Share on other sites

Hi Alain, Thank You for your input. That is what I will do.

Share this post


Link to post
Share on other sites

I have a very similar problem with my cts 4200, the powdec pte43-34 power supply has leaky caps and the unit makes a steady ticking noise about twice a second. When wired completely the fan in the amp will try to spin breifly along with the ticking.

Where did you source the replacement and did it solve your problems? Also could the Mean Well pt-65c be used in its place?

Share this post


Link to post
Share on other sites

Hello ATPP,

I source my replacement parts at the Source : Crown International, Elkhart IN!

It must be possible to get in contact with the local authorized Crown service center. The p/n for the LVPS is 135284-1. Or better, get in contact with Elkhart! They send parts all over the world!

Though, you mention you have a CTS4200 (not the CTS4200A model?) ... The difference between the two models is that the earlier CTS4200 had (4) individual output modules installed while the CTS4200A has the output circuits on the main board. Though, I believe they both use the same LVPS.

I researched the Meanwell pt-65c : It appears to be the right format but I don't know about the amperage the original LVPS supplied; It appears reasonable. As long as the voltges appear at the right locations on the power connector, you should be set to go. Though, I highly recommend to purchase genuine Crown parts.

Another note : Perhaps, why Crown is using the newer LVPS is because of the availability of extra power needed to supply the 'accessory' card on the CTS4200A.

Hope this helps!

Alain

Share this post


Link to post
Share on other sites

That does help me, thanks Alain. The unit was manufactured in 2006 and has only one fan so I believe that makes it a 4200A. I'll give a call to a local service center about a replacement lvps, the meanwell doesn't have as much available amperage on the 15v rail.

Share this post


Link to post
Share on other sites

Yes! That was the other difference : The older 4200 had (4) fans for ventilation, including the (4) individual output modules; The 4200A has only one fan and the (4) output cicuit components are all installed on the main motherboard!

A.

Share this post


Link to post
Share on other sites

Just an update, I ordered the crown replacement lvps and installed it. The amp is now in working order again. Thanks for all the help and part numbers.

Share this post


Link to post
Share on other sites

I know this is a year old post. But I had two of these 4200 coming in. I was able to fix them by replacing all the large caps on the powdec pte43-34( 45watts). I think the pte43 wasn't meant for this amp. If you look at the connectors and the pte43 boards, you can see lots of signs of overheating. There is not much cooling for this board, due to the board design( very small heat sink ) and the position it is placed in. The heat cooks the caps, one particularly stabilizing the voltage on the uc3842. Well, one can't argue much because these amps are in their 7-8 years( in a commercial environment - on 24/7 ), before the heat dried up the caps and the small board went out. One darn good amp, if you ask me.

I had also bought the Mean Well pt-65c( 65watts ). the connections fits, and the position of the +-15/5 volts matched up. So it works, but there was a problem, pt65 is taller, so it will not sit/fit on the 4200. But there is a 45watts model that does fit; Mean Well pt-45c fit perfectly, with the same dimensions, matching pins, better built and larger heat sink. And for some reason Mean Well has better pricing. $20 less than the pte43.

Share this post


Link to post
Share on other sites

TY for the update! This psu may be a great replacement for the original LVPS. Let us know if the psu does act up, eventually! :)

Alain

Share this post


Link to post
Share on other sites

I have two Crown CTS4200 with no power & looks like the varistors and relay around the LVPS are damaged on one of them along with the LVPS itself. The other has discoloring around the coil C2 is swollen etc.. I was trying to find a price for the LVPS replacement or a number to reference some information regarding the spec's on it. Thank you for any help in advance.

Eric R.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now