Power Acoustic PS2-2200

mike49504 · 2012-01-12 12:50 am

I got this amp with blown power supply fets -FQP50N06 i replaced them with IRFZ44's..

When powering up the outputs will get red hot only on 1 side of the amp..

I removved them they all tested fine.. So i took the drivers for the outputs out and they also tested fine...

I replaced the drivers for the outputs just incase they were defective and were testing fine..

The orginal drivers are B647 and D667

I replaced the D667 with a C3228 and the B647 with a A1275..

Power the amp up and they still get red hot...

Any ideas ?

timwebb · 2012-01-12 12:56 am

are the gate resistors good? any solder bridges any where?

mike49504 · 2012-01-12 1:00 am

AlL gate resistors are good and no solder bridges anywhere

timwebb · 2012-01-12 1:09 am

hows the signal look on the gate resistor?

Perry Babin · 2012-01-12 1:41 am

Can you post a photo of the board?

mike49504 · 2012-01-12 1:52 am

Heres a couple photos let me know if u need more

Perry Babin · 2012-01-12 2:05 am

Which outputs are getting hot Q...?

I see 2 are missing, were they defective?

mike49504 · 2012-01-12 2:08 am

No they are fine i took all of them out on that side for testing and only stuck 2 of each back in..

The Tip36's are getting red hot if i take the 36's out and leave the 35's in circuit the amp will power up and idle fine..

Perry Babin · 2012-01-12 2:12 am

Circuit board designation please.

mike49504 · 2012-01-12 2:14 am

Q115 Q114 Q118

Perry Babin · 2012-01-12 2:26 am

When all 6 are in the circuit are those the only 3 that get hot? Or do all 6 in that channel?

mike49504 · 2012-01-12 2:27 am

All 6 get hot

Perry Babin · 2012-01-12 3:02 am

If you short legs 1 and 2 of Q104 (bias transistor), do the outputs still get hot?

mike49504 · 2012-01-12 3:07 am

Yes

I was doing some testing and not sure if its suppose to be like this or not but the channel thats giving me problems I have 00.2 ohms between the negative speaker terminal and the B+ terminal

Perry Babin · 2012-01-12 3:10 am

Check the bias transistor. Confirm that it has two good junctions.

mike49504 · 2012-01-12 3:13 am

NO Rca's were unpluged

Bias transsistor has 2 good junctions

Perry Babin · 2012-01-12 3:22 am

Assuming that the positive terminal for this channel is used for bridging, having 0 ohms to the B+ on the negative terminal would be a problem. It would seem to indicate that the amp has a shorted transformer. Connect the meter to those two terminals and twist the transformer. Does that eliminate the short?

Power Acoustic PS2-2200

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