Help in finding diode for Lanzar MinX3000D

[imraneesa]

Hi all
I am attaching the driver board image for Lanzar MinX3000D amplifier. D1 is shorted. I would like to know the value of it. It may be zener diode. Thank you.

 

[Perry Babin]

Are either of its pads connected to any pins of any of the ICs

 

[imraneesa]

Are either of its pads connected to any pins of any of the ICs

It is not connected to any ic.

 

[Perry Babin]

if you look up iraud9.pdf online, there will be a reference design for this IC. It may be similar.
https://www.infineon.com/dgdl/iraudamp9.pdf?fileId=5546d462533600a40153569aee022bff

 

[Osvaldo de Banfield]

Is C12 in parallel to this diode?

 

[imraneesa]

Is C12 in parallel to this diode?

Yes c12 is parallel to the diode. I removed D2 to test and it conducted at 5.1v. So I tried with 5.1 at d1 but no oscillations and amp goes into protect.

 

[Osvaldo de Banfield]

If C12 is in parallel to the diode, and the cap is 16VW, then a 15V zener will sufice. IR211x are mosfet drivers and need about 12V for proper job. 5V zener is too low.

 

[imraneesa]

if you look up iraud9.pdf online, there will be a reference design for this IC. It may be similar.
https://www.infineon.com/dgdl/iraudamp9.pdf?fileId=5546d462533600a40153569aee022bff

there is some difference in the circuit it is not matching. i replaced it with 5.1v zener and no oscillations, i fear if u2 and u3 are bad. i scrape out the epoxy on top of ic and i found 05623 on it. i am guessing if it is nand gate. can you help me more in this. Thank you sir,

 

[Perry Babin]

Are there similarities?

I'm working blind and only have the information that you provided.

 

[imraneesa]

Are there similarities?

I'm working blind and only have the information that you provided.

It is looking different.

 

[imraneesa]

Are there similarities?

I'm working blind and only have the information that you provided.

I got the similar amp. The zener voltage when measured was 5.7v.
I changed the bad diodes and removed the output mosfets. When I turned on the amp the d1 and d5 short. D5 is 15v zener. Without out driverboard it produces all the voltages and dont go into protect. Those two u2 and u3 IC I have doubt on.

 

[Perry Babin]

I can't read the marking clearly. This is what was used in a similar memphis amp.

 

[imraneesa]

I can't read the marking clearly. This is what was used in a similar memphis amp.

Thank you very much. This is the correct part. But I am unable to find these to buy. They are obsolete. Is there anything I can use or try?

 

[Perry Babin]

Search digikey or mouser for the following and select the so-8 package.
Dual NPN-PNP complementary Bipolar transistor

 

[imraneesa]

Search digikey or mouser for the following and select the so-8 package.
Dual NPN-PNP complementary Bipolar transistor

i am not getting 60v. i only got this. can you please tell me if this will work?

https://www.onsemi.com/pub/Collateral/NSS40302P-D.PDF

 

[Perry Babin]

The drivers aren't likely to see more than about 20v. You can measure the voltage when testing to confirm.