PPI A1200

[mike49504]

I recieved this amp in for repair.

Someone has worked on this amp before and well put NTE parts in it for the outputs. So thet have to be switched back to the orginals.

The parts circled in blue is the NTE part the emitter resistors dont look right either . They should all be 0.33 ohms correct?

Also the 2 large resistors with the blue arrow pointing to them are they the right resistors or not? They are marked 3.9K 10%

Also Q75,Q74 Q77 Q76 appear to have been messed with also heres whats in thoose locations now Wondering if they are the correct parts

Q75:MTP3055V

Q74:IRF9540

Q77:MTP3055V

Q76:IRF9540

Any help would greatly be appericated.

 

[Perry Babin]

0.33 is right for the emitter resistors.

Q74: 2SA1303
Q75: 2SA1011
Q76: 2SC3244
Q77: 2SC3284

There are two 3.9k resistors (one is R13) near the regulators.

 

[mike49504]

Thanks Perry,

I will replace thoose parts and look through the rest of the amp also.

The power supply fets have been replaced at 1 time also .

The fets that are in the amp right now are 😛60N06's with 22 ohm gate resistors .

Are theese the right fets for this amp?

 

[Perry Babin]

I don't know what the original FETs are but those should be OK. The 22 ohm resistors are right.

 

[mike49504]

Ok cool Thanks

There is more stuff that has been replaced with nte parts

Wondering if you know what goes in the following locations.

Q13
Q14
R15
R17

Since theese all have been replaced

R15 and R17 have 33 ohm resistors in thoose locations right now.

 

[Perry Babin]

Q13: 2N6490
Q14: 2N6487

I can't find the resistors. Where are they?

 

[mike49504]

They are located right in front of Q13 and Q14

 

[Perry Babin]

If they're under the bussbar, they appear to be 3.6k ohms but I can barely see them. See attached.

 

[mike49504]

The resistors are directly in front of the ones in the pic .

Also is the amp suppose to have a busbar like in the pic??

There are 2 locations in this amp marked GND by the outputs that appear that something has been soldered there before but not now If you need more pics let me know

 

[Perry Babin]

The amps appear to be slightly different. Yours appears to use traces on the board in place of the bussbars.

The resistors that you are referring to are marked Q10 and Q16 in this amp. They are 33 ohms.

 

[mike49504]

Is there a good sub for the 2N6487's and 2N6490's?

 

[Perry Babin]

I generally use the 2N6488 or the 2N6491.

 

[mike49504]

The drivers for the outputs are the A1011 and the C2344

Is the 3rd on the C2344's directly connected o ground? Or is it The a1011?

 

[Perry Babin]

I don't think any are connected to ground. Compare to the other half of the amp.

 

[mike49504]

Ok the locations are different from the board i have here to the board u are talking about.

 

[mike49504]

Perry,

Further looking into this amp I found that someone did a number on the power supply fets They clipped the legs and did a soldering nightmare.

So im gonna put all new fets in this amp Do you know what fets would work good in this amp?

 

[Perry Babin]

I used Z48s in the last one I repaired.

 

[mike49504]

Ok thanks ill order some up.
Not to change the subject but do you have any info on kicker impluse amps?

 

[Perry Babin]

Which one?

 

[mike49504]

Kicker Impulse IX1302