Anyone had any dealings with this psu, or have a circuit diagram ?

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On Friday, February 25, 2022 at 11:43:51 AM UTC-5, Farmer Giles wrote:

Anyone had any dealings with this psu, or have a circuit diagram ?

Contact the manufacturer. Curse them when they don't send you a schematic...

Most power supplies can be repaired without a schematic with some luck and careful observation. First step is look for vented electrolytics. Second step is to check all the big semis for shorts - Mosfets, diodes, etc. Third step is to ESR all
electrolytics if not vented. Fourth step is to locate all ICs and get the datasheets for them (most available). The datasheets for the ICs will usually give a representative schematic that support the chips. Hopefully you don't need a step 5.

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On 2/25/2022 1:59 PM, ohg...@gmail.com wrote:

On Friday, February 25, 2022 at 11:43:51 AM UTC-5, Farmer Giles wrote:

Anyone had any dealings with this psu, or have a circuit diagram ?

Contact the manufacturer. Curse them when they don't send you a schematic...

Most power supplies can be repaired without a schematic with some luck and careful observation. First step is look for vented electrolytics. Second step is to check all the big semis for shorts - Mosfets, diodes, etc. Third step is to ESR all

electrolytics if not vented. Fourth step is to locate all ICs and get the datasheets for them (most available). The datasheets for the ICs will usually give a representative schematic that support the chips. Hopefully you don't need a step 5.

I often do a look listen and smell test.
Look for burnt diodes or blown electrolytic caps.
Listen for intermittence sounds when you tap components.
Smell each component if it doesn't show a burnt circuit board below it.

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On Fri, 25 Feb 2022 16:43:38 +0000, Farmer Giles <giles@nospam.com>
wrote:

Anyone had any dealings with this psu, or have a circuit diagram ?

You're sure about the brand name and model number?

If a supply is provided for a luminaire, it can react to
failures in the lamps, which is much more common than
psu failure.

RL

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On 25/02/2022 16:43, Farmer Giles wrote:

Anyone had any dealings with this psu, or have a circuit diagram ?

Thanks for all the help/advice. It's a psu controlling fish tank
lighting (not mine, a friend asked me to look at it). The
semi-conductors are all pretty obscure.

Chinese made, so not much chance of getting a circuit diagram off them I wouldn't think.

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In article <svbfv6$eul$1@dont-email.me>, keith_nuttle@sbcglobal.net
says...

On 2/25/2022 1:59 PM, ohg...@gmail.com wrote:

On Friday, February 25, 2022 at 11:43:51 AM UTC-5, Farmer Giles wrote:

Anyone had any dealings with this psu, or have a circuit diagram ?

Contact the manufacturer. Curse them when they don't send you a schematic...

Most power supplies can be repaired without a schematic with some luck and careful observation. First step is look for vented electrolytics. Second step is to check all the big semis for shorts - Mosfets, diodes, etc. Third step is to ESR all

electrolytics if not vented. Fourth step is to locate all ICs and get the datasheets for them (most available). The datasheets for the ICs will usually give a representative schematic that support the chips. Hopefully you
don't need a step 5.

I often do a look listen and smell test.
Look for burnt diodes or blown electrolytic caps.
Listen for intermittence sounds when you tap components.
Smell each component if it doesn't show a burnt circuit board below it.

I remember some blown selenium rectifiers that were impossible not to
smell!

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On Sat, 26 Feb 2022 08:45:34 +0000, Farmer Giles <giles@nospam.com>
wrote:

On 25/02/2022 16:43, Farmer Giles wrote:

Anyone had any dealings with this psu, or have a circuit diagram ?

Thanks for all the help/advice. It's a psu controlling fish tank
lighting (not mine, a friend asked me to look at it). The
semi-conductors are all pretty obscure.

Chinese made, so not much chance of getting a circuit diagram off them I >wouldn't think.

Your ident is either mis-spelled or mis-identified.

What kind of light? incandescent / fluorescent / LED ?

Are there voltage/current ratings on the label?

RL

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On 26/02/2022 14:09, legg wrote:

On Sat, 26 Feb 2022 08:45:34 +0000, Farmer Giles <giles@nospam.com>
wrote:

On 25/02/2022 16:43, Farmer Giles wrote:

Anyone had any dealings with this psu, or have a circuit diagram ?

Thanks for all the help/advice. It's a psu controlling fish tank
lighting (not mine, a friend asked me to look at it). The
semi-conductors are all pretty obscure.

Chinese made, so not much chance of getting a circuit diagram off them I
wouldn't think.

Your ident is either mis-spelled or mis-identified.

That's the trade name on it.

https://urmstonaquatics.com/tmc-v2ilumenair-900-1200-power-supply-9200psu-uk.html

What kind of light? incandescent / fluorescent / LED ?

I don't have access to what it controls, but as I said above it's
something to do with fish tank lighting.

Are there voltage/current ratings on the label?

Yes, but what difference does that make?

However, I think I've located the problem - the first of them at least!
There's a bridge rectifier that is not reading correctly, need to remove
it to make more accurate checks.

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On Sun, 27 Feb 2022 09:12:57 +0000, Farmer Giles <giles@nospam.com>
wrote:

On 26/02/2022 14:09, legg wrote:

On Sat, 26 Feb 2022 08:45:34 +0000, Farmer Giles <giles@nospam.com>
wrote:

On 25/02/2022 16:43, Farmer Giles wrote:

Anyone had any dealings with this psu, or have a circuit diagram ?

Thanks for all the help/advice. It's a psu controlling fish tank
lighting (not mine, a friend asked me to look at it). The
semi-conductors are all pretty obscure.

Chinese made, so not much chance of getting a circuit diagram off them I >>> wouldn't think.

Your ident is either mis-spelled or mis-identified.

That's the trade name on it.

https://urmstonaquatics.com/tmc-v2ilumenair-900-1200-power-supply-9200psu-uk.html

What kind of light? incandescent / fluorescent / LED ?

I don't have access to what it controls, but as I said above it's
something to do with fish tank lighting.

Are there voltage/current ratings on the label?

Yes, but what difference does that make?

However, I think I've located the problem - the first of them at least! >There's a bridge rectifier that is not reading correctly, need to remove
it to make more accurate checks.

You'll need a properly identified load, if only to duplicate
failure symptoms and verify the repair.

What were the reported symptoms?

Does it flashes the load once, repeatedly or not at all, when
power is applied?

Any smell associated with it?

Intermittent when line cord jiggled?

etc.

24V 10A is a pretty common rating, but the restriction for use
with the specified load suggests that corners were cut in
performance that may only be revealed by using that load in
testing, unless you have a variable resistive/constant-voltage/ constant-current loads as substitutes.

RL

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