M2500.1d output help.

[rhempz01]

Pin 1 back of driver board

 

[rhempz01]

Pin 2 and 6 have this signal on them.

 

[rhempz01]

Left side gate leg

 

[rhempz01]

Right side q4 gate leg

 

[rhempz01]

Sorry perry I tried to look up the chip and get the data sheet to find which is what. But I got this on the right. Pin 3 u4

 

[rhempz01]

Left u5 pin 3

 

[rhempz01]

I think that pins 1-4 are the in and 5-8 is the out. And I have a sqaure wave on four legs of the driver board. I have -1.345v on the left bank of output gates and 7.2mv on the right bank output transistors?

 

[Perry Babin]

The opto-coupler is a 6n137.

Are the rectifiers back in (should not be)? The drive signals should be at ground.

For the high-side, you may need to ground the source leg of the output FET to see the signal clearly.

 

[rhempz01]

No they are still out. I haven't done anything until.this get figured out. I downloaded the data sheet. Are they working properly? Ground the fet leg and probe the drive at the fet? Is the low side one bank and the high side the other in this amp? Still trying to figure this output section trouble shooting out.

 

[Perry Babin]

Ground the fet leg and probe the drive at the fet?
yes. ground leg 3.

Are they working properly?
What, specifically?

Pin 11 of the driver board drives the high-side through the opto-coupler.

Pin 10 drives the low-side through the drive circuit with no opto-coupler.

 

[rhempz01]

With the leg grounded.

 

[rhempz01]

Does anyone know what the I/c are on this board in the middle?

 

[rhempz01]

Reason I was asking that chip on the board the small one sop8 and the one above a heating up more so than the rest of the board.

 

[Perry Babin]

LM219 and NJM4560

If you have two outputs from the driver board, those ICs are likely OK.

 

[rhempz01]

I think I'm grasping straws perry I can't understand why I don't have audio. ...I was able to see alot of signals on the Rockford with the new scope so it's a learning experience.

 

[rhempz01]

If the amp is not self isolating then I need to push a signal into the RCA to see the drive signal perry?

 

[Perry Babin]

Some amps fail to oscillate until they see a signal. If it does not oscillate at high frequency (80kHz), it may pass the test frequency (50-100Hz, whatever you choose).

 

[rhempz01]

Thanks perry. P.s i just stopped messing around i have been doing this for a year now, fail and succeed. I just purchased your advanced repair tutorial, over the next few weeks/months i will be reading and studing it in its entirely. There is just so much more i want to learn, i go to work and wait to get home so i can do i can get back to my bench, lol.

 

[rhempz01]

these two amplifiers are cheap pcb pad fall off trace burns or disconnects at every turn they have been a nightmare i can get the ps up and healthy then the output reinstall the everything and it will draw current>>

 

[Perry Babin]

In the photo in post 32, look at the pins. three have parts of the vias pulled from the board. When this happens, the connections to the top of the board may be lost or intermittent and can cause a lot of problems. Using ChipQuik can completely eliminate this problem if it's used properly. Using CQ, you will never damage another pad or via when pulling driver boards.