UcD180 Repair

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#25
Silver Stealth said:
Update.....

I've found a source for the Philips ZT2907A - www.rswww.com.au has them for around $1.15ea (min 5+).

Still unsure about D2 specs or orientation - can anyone suggest a replacement substitute on a UcD180?
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I think D2 is a 12v smd zener diode in a SOT-23 package, have a search on RS for BZX84-C12, I'd check with Hypex first to be sure
 
#27
Silver Stealth said:
Thanks very much for the suggestion - yep these are $0.16 min qty 50 (A$8). Email through the hypex website to check the component?

Incidentally how did you know this??? He he he...
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No problem, glad I could help🙂

I removed one of my UCD180's and had a look at the components, D2 is in the regulation circuit for the input op-amp supply, I think its the +V supply
Farnell may have them in smaller qty's, might save you buying 50 of the things
 
#29
Silver Stealth said:
Hey I see is it "2F" on the top of the device - however if so this doesn't correlate with the data sheet - a BZX84-C12 should have a code Y2*. Can you read this code on yours? And D1 looks the same (which isn't blown up) - do you concur?
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Yes mine also says Y2, I've measured it and it reads 11.97v DC, it has a 15k resistor which biases it.
Have a look here at the part which is the 16th down, its code is Y2 and is a BZX84-C12 12v 300mW zener http://www.tkb-4u.com/code/smdcode/smdcodeY.php

They are the same device on both the positive and negative supply, only difference is their orientation
 
#38
Update on the 180 snubber repair....

I went ahead and ordered 8 22uf 100v radial mini-caps from Partsexpress - it's a gamble on size/fit but for the grand total of $9 it seemed like a worthy risk. 😀

I'm hoping that mini means mini ...

I'll keep you informed...

Best Regards,
Tom
 
#39
t. said:
Your replacing the part that looks the same as D1 here?
An externally hosted image should be here but it was not working when we last tested it.


A BZX284-C12 won't fit, D1 and D2 need to be a Sot-23 package
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We must have different design revisions of the board - I think mine is a 2004 edition. As I mentioned previously mine is a SOT110 package, and I can read the writing with a magnifying glass so I can get the orientation right. I see yours is not (SOT23)...

From your pics I see you are providing the +/-12V independently which is the opamp PSU upgrade tweak?
 
#40
Silver Stealth said:



We must have different design revisions of the board - I think mine is a 2004 edition. As I mentioned previously mine is a SOT110 package, and I can read the writing with a magnifying glass so I can get the orientation right. I see yours is not (SOT23)...

From your pics I see you are providing the +/-12V independently which is the opamp PSU upgrade tweak?
Click to expand...

I just wanted to make sure you ordered the right one🙂

Thats not one of my modules, just a picture I found to use but yes it looks like that one uses separate regulation.

Good luck with the repair and say well done to your wife😉 One thing to check, if your UCD's use the NE5532's and its an older model make sure those zeners are not the 15v ones, I'm sure the older models used 15v instead of 12v
 
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