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Class D SMPs Combi

Ike Mhlanga

Feb 12, 2018
15
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Feb 12, 2018
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Hi,
Can someone kindly help me identify this Class D SMPS Combi amplifier.
If Possible I need schematics.
Any information that might help with repairs.
Unit Blew Power Fuse.
Amp Alarm OK
SMP Alarm OK
DS Alarm Flagged
Regards

Ike
 
Last edited:

bertus

Moderator
Nov 8, 2019
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Hello,

Do you have more details on the amplifier?
Wich brand and type?

Bertus
 

Ike Mhlanga

Feb 12, 2018
15
Joined
Feb 12, 2018
Messages
15
Hello,

Do you have more details on the amplifier?
Wich brand and type?

Bertus
I do not have a brand but I have a jpeg picture of it. But its failing to load. Thank you.
I must be doing something wrong uploading.
 

Ike Mhlanga

Feb 12, 2018
15
Joined
Feb 12, 2018
Messages
15
Hello,

Do you have more details on the amplifier?
Wich brand and type?

Bertus
Good Afternoon,
I have taken a picture of it but its failing to up load.
Maybe I am doing something wrong.
 

bertus

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Nov 8, 2019
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Hello,

Resize the picture. The forum will accept pictures of about 300 kB.

Bertus
 

Ike Mhlanga

Feb 12, 2018
15
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Feb 12, 2018
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Ok Thank You Very much.
Here it is. I hope it is clear on your end
 

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Ike Mhlanga

Feb 12, 2018
15
Joined
Feb 12, 2018
Messages
15
Hello,

Do you have more details on the amplifier?
Wich brand and type?

Bertus
This is the Class D amp. No details on the board as regards the manufacturer.
The only thing there is are the following:
PN30302
Rev AQ
RRA2017
Regards
Ike
 

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  • Pic 3@0,1x.jpg
    Pic 3@0,1x.jpg
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WHONOES

May 20, 2017
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Got absolutely nothing from a gooooooooogle search.
 

dave9

Mar 5, 2017
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Even with 300K pic size limit, you could do a lot better than that including other sides of it.

Is it modularized with the left board just a PSU function and the right, connected by wires, the amp board?

If so, unplug the amp. Try PSU without amp, and try amp with a different PSU. Ideally a current limiting PSU. Somewhere on the board, for example the amp IC, or capacitor ratings, should be hints about a voltage to try. If nothing else I'd try half the rating of the electrolytic caps in the middle of the board, thinking that looks like a dual rail PSU.

Among the many suspects, I'd suspect a transistor first.
 

bertus

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Nov 8, 2019
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Hello,

As said, the picture is to small to see anything.
You could take pictures of the following sections:
Ike SMPS class D sections.jpg
Make pictures of the top and bottom of the given sections.
Make them about 300 kB each.

The red section is the high voltage switching part of the SMPS.
The orange section is the low voltage part of the SMPS.
The yellow section is the Class D amplifier.

As @dave9 said, you could try the Class D amplifier on an external power supply.

Bertus
 

Ike Mhlanga

Feb 12, 2018
15
Joined
Feb 12, 2018
Messages
15
Hello,

As said, the picture is to small to see anything.
You could take pictures of the following sections:
View attachment 51526
Make pictures of the top and bottom of the given sections.
Make them about 300 kB each.

The red section is the high voltage switching part of the SMPS.
The orange section is the low voltage part of the SMPS.
The yellow section is the Class D amplifier.

As @dave9 said, you could try the Class D amplifier on an external power supply.

Bertus
Good Day to you all.
Sorry I have been offline due to unforeseen factors.
I will try and magnify the pictures as requested by Mr Bertus.
Corrections:
1) The Yellow Section is an ADAU 1701 programmable board with Audio Processing.
Since This is a Powered Sub, The ADAU incorporates the Cross Over as well. Sending signal to the HF section.
2) The Orange section is indeed the low voltage part Of the power supply.
It also includes the Class D Power Amp with two Mirrored Class D amps running in parallel.
The Amp has Two Mirrored IRS 2092 ICs. Each Driving two IRFB 4615 FETs which are running in parallel with the other Mirror.
The four IRFB FETs are under the board.
The IRS 2092 carries all the protection.

I will post the pictures.
Regards

Ike
 

Ike Mhlanga

Feb 12, 2018
15
Joined
Feb 12, 2018
Messages
15
Even with 300K pic size limit, you could do a lot better than that including other sides of it.

Is it modularized with the left board just a PSU function and the right, connected by wires, the amp board?

If so, unplug the amp. Try PSU without amp, and try amp with a different PSU. Ideally a current limiting PSU. Somewhere on the board, for example the amp IC, or capacitor ratings, should be hints about a voltage to try. If nothing else I'd try half the rating of the electrolytic caps in the middle of the board, thinking that looks like a dual rail PSU.

Among the many suspects, I'd suspect a transistor first.


Hi Dave,
No it is not modularised. Amp and Power supply are one unit.
Input is ADAU 1701. Acts as Preamp as well as Cross Over for HF. On separate board.
To separate I have to cut Tracks.
You might be right about transistors. They are IRFB 4615 FETs. four in sets of two running in parallel.
Driven by two IRS 2092 ICs. each driving one side of the Class D amp. They carry the protection.
The Grey Inductors and capacitors are the Audio decoders on the output of the Parallel Class D Amps.

I will post larger pictures.
I tested the FETs and they are ok.
The amp emits a kind farting sound. which could be the power SMPS but all voltages from the SMPS are ok.

Thanx for the input.

Regards

Ike
 

Ike Mhlanga

Feb 12, 2018
15
Joined
Feb 12, 2018
Messages
15
Hello,

As said, the picture is to small to see anything.
You could take pictures of the following sections:
View attachment 51526
Make pictures of the top and bottom of the given sections.
Make them about 300 kB each.

The red section is the high voltage switching part of the SMPS.
The orange section is the low voltage part of the SMPS.
The yellow section is the Class D amplifier.

As @dave9 said, you could try the Class D amplifier on an external power supply.

Bertus

Hi Bertus,
Thanx for the input.
I have posted some comments regarding the amp. Maybe the extra detail will help.

regards

ike
 
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