Hifonics BX1800d smd?

jordan_ciaramit · 14th June 2011, 03:36 AM

I need some advice to what these part numbers are so I can replace them. One say DK QZ and the other says AG QZ. I used the smd code book and came up with bcx52 and BCX42 but not confident that is what replaces these.

The amp is also missing the LPF pot and I dont know how to start looking for a replacement.

Thanks

jordan_ciaramit · 14th June 2011, 03:48 AM

I also forgot add that the parts appear to be sot89. The BCX42 part number is sot23

jordan_ciaramit · 14th June 2011, 05:17 AM

The potentiometer is a quad I just need the value! Would it hurt to put a random one in like a 10k? It seems like the wrong pot would only limit my LPF range.

Perry Babin · 14th June 2011, 12:25 PM

Likely:
2SC4672
2SA1797

The following part may work for the crossover pot if you can't find anything else. The original was likely a 50k.
652-PTD904-2015KA203

I'd suggest that you photograph the traces under the pot before you install it. If any of the vias have been ripped out, having the photo will allow you to make the connections from the trace on the top of the board to the pins on the bottom with a jumper.

jordan_ciaramit · 15th June 2011, 07:43 PM

Perry thanks again, I pulled the datasheets on the 2sc4672, 2sa1797 and you are absolutely right. I would like know how you knew is there a chart or something that I missed?

I replaced the missing pot with a 50k and replaced a bad zener and now it comes on and plays sounds good, but idles at 3.0 amps and one bank of outputs gets hot. I am hoping that replacing those drivers will help.

Perry Babin · 15th June 2011, 08:21 PM

There are sites like the following one that help but sometimes it takes a bit more research to find the right part. As far as I know, there's no guide that is 100% accurate.
The SMD Code Book

14th June 2011, 12:25 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Likely: 2SC4672 2SA1797 The following part may work for the crossover pot if you can't find anything else. The original was likely a 50k. 652-PTD904-2015KA203 I'd suggest that you photograph the traces under the pot before you install it. If any of the vias have been ripped out, having the photo will allow you to make the connections from the trace on the top of the board to the pins on the bottom with a jumper. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

15th June 2011, 08:21 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There are sites like the following one that help but sometimes it takes a bit more research to find the right part. As far as I know, there's no guide that is 100% accurate. The SMD Code Book __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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14th June 2011, 03:48 AM	#2
jordan_ciaramit diyAudio Member Join Date: Oct 2006 Location: Franklin, Tn	I also forgot add that the parts appear to be sot89. The BCX42 part number is sot23

14th June 2011, 05:17 AM	#3
jordan_ciaramit diyAudio Member Join Date: Oct 2006 Location: Franklin, Tn	The potentiometer is a quad I just need the value! Would it hurt to put a random one in like a 10k? It seems like the wrong pot would only limit my LPF range.

15th June 2011, 07:43 PM	#5
jordan_ciaramit diyAudio Member Join Date: Oct 2006 Location: Franklin, Tn	Perry thanks again, I pulled the datasheets on the 2sc4672, 2sa1797 and you are absolutely right. I would like know how you knew is there a chart or something that I missed? I replaced the missing pot with a 50k and replaced a bad zener and now it comes on and plays sounds good, but idles at 3.0 amps and one bank of outputs gets hot. I am hoping that replacing those drivers will help.

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