Kenwood 923

mike49504 · 13th March 2010, 11:29 PM

I got this amp in and its dead. I tryed testing the voltages on the 494 all 16 pins read 0 volts.

I check the large diode behind the power and ground terminals and it measures good.

Wondering where i should start checking?

mike49504 · 14th March 2010, 12:16 AM

Perry,

Wondering if you know where i should start checking to see why no voltage is getting to the 494 in this amp

Perry Babin · 14th March 2010, 12:25 AM

Follw the traces back from pins 8, 11 and 12 to the next transistor on that trace. It should be a PNP transistor. What's the part number on it?

What is the DC voltage on it's 3 terminals?

mike49504 · 14th March 2010, 12:52 AM

Ok its marked C945 and all 3 pins are at 0 volts.

Perry Babin · 14th March 2010, 12:54 AM

Follow it back further or look for other branches on the trace. It should be near the B+ terminal.

mike49504 · 14th March 2010, 01:36 AM

I found the problem a blown trace.

Amp powers up and plays perfect.

Thanks for your help Perry

13th March 2010, 11:29 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Kenwood 923 I got this amp in and its dead. I tryed testing the voltages on the 494 all 16 pins read 0 volts. I check the large diode behind the power and ground terminals and it measures good. Wondering where i should start checking?

14th March 2010, 12:25 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Follw the traces back from pins 8, 11 and 12 to the next transistor on that trace. It should be a PNP transistor. What's the part number on it? What is the DC voltage on it's 3 terminals? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

14th March 2010, 12:54 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Follow it back further or look for other branches on the trace. It should be near the B+ terminal. __________________ 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 March 2010, 12:16 AM	#2
mike49504 diyAudio Member Join Date: Sep 2006	Perry, Wondering if you know where i should start checking to see why no voltage is getting to the 494 in this amp

14th March 2010, 12:52 AM	#4
mike49504 diyAudio Member Join Date: Sep 2006	Ok its marked C945 and all 3 pins are at 0 volts.

14th March 2010, 01:36 AM	#6
mike49504 diyAudio Member Join Date: Sep 2006	I found the problem a blown trace. Amp powers up and plays perfect. Thanks for your help Perry

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