Memphis 16-pr1x1000 help

[rhempz01]

I haven't changed anything since I blew the new 3205 with new drivers. What else should I check or change PS fets, or the 2 other transistors on the output side?

 

[Perry Babin]

does your multimeter read frequency?

 

[rhempz01]

I don't think so Perry.

 

[Perry Babin]

Did any of the output transistors fail?

 

[rhempz01]

I wish I could explain how it started up. It was like steps, on the final one it blew the 3 of 3205's in half. Seemed like an easy enough fix, drivers and fets??

 

[Perry Babin]

did any of the output transistors fail?

 

[rhempz01]

I believe a few are bad Perry. So I will order them. Thanks

 

[Perry Babin]

You can't 'think' You have to know how to test them and then determine if they are defective. If you aren't sure that you're testing properly, explain how you're testing.

If you have blown outputs in the circuit, the power supply cannot be tested.

 

[rhempz01]

Resistance, but in this amp Perry. I used continuity tester all three leg made a beep in the four outputs q205, q204, q104, q105. The other four do not. The four I believe are OK read 1-3 121.6ohm. 1-2 121.4ohms and 2-3 00.0ohms. The four I believe to be bad read 1.2ohms 1.2 1.2 ohms 2-3 .4ohms.

 

[rhempz01]

I printed out a read your repair and testing papers. It helped, but it's still a learning process. Would the retifiers be bad cause the PS fets to blow also? The only reason I ask is I just noticed the spot in the thermal Greece where one sits is discoloration, where it got hot

 

[Perry Babin]

A reading near 0 ohms between the legs of any individual transistor means it's defective or a transistor in parallel with it is defective. They would need to be removed from the circuit for more definitive testing.

A shorted rectifier could cause the power supply to fail but rectifier failure is relatively rare.

 

[rhempz01]

i ordered 10 of them, but i want to save as many as i can for the future. So i will pull them and test them. Although im not sure what reading exactly im looking for.

 

[rhempz01]

Basically there shouldn't be resistance out of circuit or it's shorted correct. 2 of them are bad the rest are OK.

 

[rhempz01]

Is it OK to add two of a different date code to the six I already have, or change all for of that side?

 

[Perry Babin]

Shouldn't be resistance? What do you mean? Be very clear in your questions.

For parallel outputs, all need to have matching date codes. The N-channel date codes don't have to match the P-channel date codes.

 

[rhempz01]

OK, so I'll change all in that set, anything else need to be changed if use all new output transistors?

 

[Perry Babin]

If the output transistors failed, the driver transistors (8-pin package) likely failed and components back to the driver IC may have failed.

 

[rhempz01]

there ae 2 of them with the imprint SQ1DTP06 i think i really couldnt make it out. But i could use a little help on which ones to order, i cant seem to find that part number anywhere.

 

[Perry Babin]

STS01DTP06

It looks like it's obsolete. Email the manufacturer to see if there is a sub.
Home - STMicroelectronics

 

[rhempz01]

Here's a good picture of the chip