Kenwood 823

mike49504 · 15th March 2010, 05:02 AM

I repaired the power supply in this amp and outputs.

I have rail voltage on outputs and + - on the opamps on the main board i checked the switches and pots But still have no output on left channel.

Wondering where i start checking Left channel is dead

mike49504 · 15th March 2010, 05:21 AM

Ok heres what i found on this amp.

If the low pass filter is on both channels produce output. If i turn the low pass filter off left channel is dead.

Bad switch??

Perry Babin · 15th March 2010, 05:28 AM

Check for signal on the switch. Drive signal into the good channel and see which pins have audio. Drive signal into the other channel. Do you have audio on the other row of pins?

This is probably best done with audio or a test signal that has more than one frequency.

mike49504 · 15th March 2010, 05:53 AM

I cant find a signal on the switch for either channel.
Unless my scope is set wrong. I have it set on 2us 5v/div

Perry Babin · 15th March 2010, 05:57 AM

2mS, not uS. Try lowering the voltage to 1v. Disconnect the speakers and drive a strong signal into the amp. It will make it easier to see.

mike49504 · 15th March 2010, 06:05 AM

Ok i did what u said and The pins on the switch are showing audio on 3 of the pins.(right channel)

Left channel no audio on any of the pins

If i switch it to lowpass filter i have audio on both left and right channel pins of the switch

Perry Babin · 15th March 2010, 06:22 AM

You need to confirm that the left channel signal is reaching the board. Check for signal on the biard just inside the RCA jacks.

Can you email me a photo at the best resolution possible?

babin_perry@yahoo.com

mike49504 · 15th March 2010, 07:03 AM

Where do i test for audio?

Perry Babin · 15th March 2010, 07:15 AM

The first place would be on the back of the RCA jacks. Feed signal only into the dead channel input. Place the switch in stereo mode.

mike49504 · 15th March 2010, 07:28 AM

Ok i have audio on the back of the rca jacks

15th March 2010, 05:02 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Kenwood 823 I repaired the power supply in this amp and outputs. I have rail voltage on outputs and + - on the opamps on the main board i checked the switches and pots But still have no output on left channel. Wondering where i start checking Left channel is dead

15th March 2010, 05:28 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Check for signal on the switch. Drive signal into the good channel and see which pins have audio. Drive signal into the other channel. Do you have audio on the other row of pins? This is probably best done with audio or a test signal that has more than one frequency. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

15th March 2010, 05:57 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	2mS, not uS. Try lowering the voltage to 1v. Disconnect the speakers and drive a strong signal into the amp. It will make it easier to see. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

15th March 2010, 06:22 AM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You need to confirm that the left channel signal is reaching the board. Check for signal on the biard just inside the RCA jacks. Can you email me a photo at the best resolution possible? babin_perry@yahoo.com __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

15th March 2010, 07:15 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The first place would be on the back of the RCA jacks. Feed signal only into the dead channel input. Place the switch in stereo mode. __________________ 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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15th March 2010, 05:21 AM	#2
mike49504 diyAudio Member Join Date: Sep 2006	Ok heres what i found on this amp. If the low pass filter is on both channels produce output. If i turn the low pass filter off left channel is dead. Bad switch??

15th March 2010, 05:53 AM	#4
mike49504 diyAudio Member Join Date: Sep 2006	I cant find a signal on the switch for either channel. Unless my scope is set wrong. I have it set on 2us 5v/div

15th March 2010, 06:05 AM	#6
mike49504 diyAudio Member Join Date: Sep 2006	Ok i did what u said and The pins on the switch are showing audio on 3 of the pins.(right channel) Left channel no audio on any of the pins If i switch it to lowpass filter i have audio on both left and right channel pins of the switch

15th March 2010, 07:28 AM	#10
mike49504 diyAudio Member Join Date: Sep 2006	Ok i have audio on the back of the rca jacks

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