Cadence ZRS C5

[Albis2985]

Someone has a reference or photo of the driver card that uses this amplifier since they arrived at the workshop without it. I appreciate the help to at least see if I have any similar in the workshop that works for you and to take the repair

 

[Perry Babin]

See if the pin count matches.

 

[Albis2985]

How about Perry the number of pins match? That driver board is compatible so I think I have some out there thanks.

 

[Perry Babin]

I don't understand the question. If the pin count matches, it's likely the right board.

 

[Albis2985]

Sorry, I put it in the form of a question, what I wanted to say is that if the number of pins match and that I have some out there, thank you.

 

[Albis2985]

Good afternoon Perry,

I annoy you again with this amplifier since I feel that the fault is in the driver board, the output transistors get hot I can not tell you how many degrees because I have nothing to measure the temperature but the touch with the fingers can not be touched because Burn I changed the ir21844s and the tl072 that were absent in the card I had there is oscillation in the output transistors, I measured all the resistances in the gate of the mosfet and they are in the correct value. What do you suggest me to review I thank you since I don't have much experience with class d amplifiers.
Sorry for the inconvenience

 

[Perry Babin]

(If you have them installed) do ALL of the output FETs get equally hot?

 

[Albis2985]

Correct Perry everyone gets hot the same, I told you that I put them in their heatsink thinking that it was normal because they were working and in the test with 1 ohm load the tvs diode and 3 mosfet of the output were burned, now I mounted the new transistors again including the rectifier diode but only when connected outside the chassis just activates the relay, the output mosfet heats up

 

[Perry Babin]

Are you saying that you were testing the amp out of the heatsink while driving a speaker load?

I'm having trouble understanding your posts. You might want to post normally AND post the text produced by a translator. Between the two, it may be easier to understand.

 

[Albis2985]

I am using the google translator, my English is not very good, I tested the amplifier with the heatsink and speaker load and it was when the diode burned and 3 output mosfet.

 

[Perry Babin]

Try other translators. Convert to English and then back to your language and see which translator gets the double translation the closest to being accurate.

The board has some damage from when the driver board was removed. Are you sure that you reliably reestablished ALL of the connections from the top of the board?

 

[Albis2985]

Well actually that board I took it from another amplifier I had to spare but it needed the ir21844 and the tl072 I installed it and I tested the amplifier with that board and it turned on well, the amplifier originally came without the conducting board and with the source burned, I repaired the source but now I have the problem with the outputs

 

[Perry Babin]

Do the outputs heat up (clamped to the heatsink) if you just let the amp idle for an extended period of time?

Does the amp draw excessive current at idle?

Do you have a scope?

 

[Albis2985]

Right, I already did that test

No, consumption is less than 2 amperes

yes, I have scope

 

[Perry Babin]

Did you buy the FETs from a reputable distributor (not ebay)?

How did you reconnect the traces on the top of the board that had broken vias?

What make/model scope?

 

[Albis2985]

I bought them at a local electronics store

Insulated coil wire

Hantek 2C42

 

[Perry Babin]

With that scope operating from battery (no connection to any other power source), do all of the gate drive signals look good? Black probe on the source leg, red on the gate leg. Scope set to 5v/div and whatever timebase that will display 3-4 full cycles.

Is that distributor an authorized distributor?

 

[Albis2985]

Good morning Perry, if you can see the square waves in the gate of all the mosfets. The dealer is an electronic spare parts store and so far I have had no problems with the parts I sell. You recommend I buy other mosfets?

 

[Perry Babin]

if you can see the square waves in the gate of all the mosfets. << rephrase

I'm not recommending that you buy other FETs at this time.

 

[Albis2985]

If I can see the waves on the mosfets. What do you recommend I review?