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Need help to id parts for Rockford Prime 300x4
Need help to id parts for Rockford Prime 300x4
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Old 6th December 2018, 04:46 PM   #1
mild2wild is offline mild2wild  Trinidad and Tobago
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Join Date: Nov 2014
Default Need help to id parts for Rockford Prime 300x4

Was not able to answer this question using existing threads... Need to id Q1 transistor and P1 resistor.

Have here a Rockford Fosgate Prime 300x4 that has a blown film capacitor, an exploded transistor, a burnt resistor and an output that reads low but not shorted.

1) The blown transistor, Q1, is right next to the TL494 IC and has its middle leg directly connected to pin13 of the TL494.

2) The burnt resistor, P1?, is right next to it and each end is directly connected to each outer leg of Q1.
It reads almost 2K ohms when measured UT I can't make out the bands.

The blown capacitor, PC3, is identified as a 10uf25v film capacitor since its case was bouncing around inside, and the B688 of channel 3 reads low when metered. I am hoping that is all that is needed but I am unable to power it up until I change that transistor, resistor, capacitor, and output.
Attached Images
File Type: jpg IMG_20181128_233249.jpg (767.3 KB, 24 views)
File Type: jpg IMG_20181128_233315.jpg (828.8 KB, 25 views)
File Type: jpg IMG_20181128_233400.jpg (404.7 KB, 23 views)
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Old 6th December 2018, 05:49 PM   #2
Perry Babin is offline Perry Babin  United States
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Do these help?
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File Type: jpg DSCN7888x.jpg (761.5 KB, 22 views)
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Old 6th December 2018, 06:00 PM   #3
mild2wild is offline mild2wild  Trinidad and Tobago
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Thanks for the pics, they are of immense help.

Is it imperative that Q1 be a B772, or can a more readily available substitute be used? If so, what can be substituted that is more common?

Also, can a 10uf50v be used in place of the 10uf25v?

Last edited by mild2wild; 6th December 2018 at 06:10 PM.
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Old 6th December 2018, 09:44 PM   #4
Perry Babin is offline Perry Babin  United States
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I think the transistor is a switch and not critical but the replacement should have equal or greater ratings for voltage and current.

Are you sure that pins 13/14 are connected to the collector of that transistor?

The 50v cap will be OK.
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Old 7th December 2018, 05:01 PM   #5
mild2wild is offline mild2wild  Trinidad and Tobago
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I was mistaken, the collector of Q1 is connected to pin 12 of the TL494.

I was not able to get a B772 transistor locally UT they gave me a A715 as a substitute. It is close to the B772 but not superior. Vcb is 35v instead of 40v, Vce is 35v instead of30v, and lc max is 2.5A instead of 3A. Do I still need to source a better substitute for the B772? The amp is fully functional as all other parts were replaced and it is operating properly.
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Old 7th December 2018, 06:14 PM   #6
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
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I don't know how it's being used in the circuit so I can't say whether it will survive.

If it's used for switching on/off, not high frequency square wave, something like the 2N6491 installed reversed, due to the reversed pin configuration, should work.
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