Mmats d3500.1 questions for repair

[Perry Babin]

Does the + terminal of the round bridge rectifier (assuming since I'm working blind) go to the input terminal of the regulator?

 

[punch45x2]

Yes I have full continuity between vdd+ on u1 and output pin 3 of the voltage regulator.

 

[punch45x2]

U1 is a quad op amp. Tlc2274c

 

[punch45x2]

I also double checked and the output at pin3 is also 14.9v. I do see some discoloration by pin 2 as well.

 

[punch45x2]

I think I miss read that is the rectifier the round thing between the 2 power toroids

 

[Perry Babin]

What do the two AC terminals of that bridge rectifier connect to?

 

[punch45x2]

Ok so + of the rectifier goes to pin 1 of q20. Then pin3 of q20 goes to the input on regulator. If i ohm out + from rectifier to input of regulator I get 65 ohms through q20

 

[punch45x2]

So 1 is power + input 2 to the windings on one of the toroids then + to q20

 

[Perry Babin]

Please (and this applies to anyone who needs repair help) use your sig line to list all equipment you have, editing it as equipment changes. Include the model numbers.

Top of page, menu USER CP >> EDIT SIGNATURE

Oscilloscope (yes or no)
Multimeter(s)
Type of signal source (grounded RCA shields preferred).
Soldering iron
Desoldering pump
Power supply
2 ohm current limiting resistor (hollow cylindrical ceramic 100w preferred)

 

[punch45x2]

Updated

 

[Perry Babin]

Please post a good quality photo of the board.

Is pin 11 of the TLC2274 connected to ground?

 

[punch45x2]

It is I will ohm it out and post pic of board tomorrow

 

[punch45x2]

Here are pics of the boards.Link Sharing

 

[punch45x2]

Link Sharing

 

[punch45x2]

Link Sharing

 

[Perry Babin]

Please post the photos to the forum so that they will remain with the thread.

To upload photos click the following:

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[punch45x2]

Pics

 

[punch45x2]

Pin 11 has solid ground. Also tested input voltage on the regulator and I have 17v input to pin 1

 

[Perry Babin]

I think the TLC2274 is the equivalent of the CA5470 in the following diagram.

The driver section is different in your amp. I don't have any diagrams for any MMATS amps.
http://www.bcae1.com/temp/Fusion-FP9001D caramp - 4080 like stealth.pdf

Or IC2 in the attached diagram.

 

[punch45x2]

It's more like the fusion amp. But the rectifier feeds a transistor and the transistor feeds the voltage regulator.