Pioneer A-60 fault

RS232 · 27th September 2009, 04:04 PM

Hi everybody I have a small (?) problem with my wonderfull A-60
The problem is that about 40 minutes to 1 hour of playing it cutts off the speakears relay, everything else is powered but no connection to the speakers.
Can someone give me a hint were to look ?
I have the service manual
I have seached the forum and found nothing about this amp.
Thanks
Ric

eyoung · 27th September 2009, 04:21 PM

This is usually caused by DC on the speaker output. If you or another abliging soul could post a schematic maybe one the smart guys on the list could posit a possible cure...

Regards Y,all, Elwood

AndrewT · 27th September 2009, 04:39 PM

find the pins on the speaker relay that have the input signal on them.
Check the DC output offset voltage while the amp is cold, again after 15 minutes of warm up time and finally after it has shut down.

big jim · 27th September 2009, 05:04 PM

hi i have the service manual pm me and i will send you a copy

Mooly · 27th September 2009, 05:23 PM

Might be more simple than that with any luck... check for dry joints on any power transistors/regulators that run hot. Had that with a Pioneer A80 years ago.

If it is a DC fault you need to determine which channel is duff. You can connect an LED across a bridge rectifier (one for each channel) together with appropriate limiting resistor and connect to output (before the relay) and ground. Any DC fault of either polarity will illuminate the LED on the duff channel.
If it's not a dry joint then B-E junctions going intermitent open circuit are favourite

RS232 · 06:08 PM

Thanks to all
I have the service manual but thanks for the offer.
What makes me think is that it never gets hot, there are lots of ventilation holes and it only get slightly warm
Will check for dry joint for start and go on from there.
Thanks again
Ric

27th September 2009, 04:04 PM	#1
RS232 diyAudio Member Join Date: Jan 2006 Location: Swindon	Pioneer A-60 fault Hi everybody I have a small (?) problem with my wonderfull A-60 The problem is that about 40 minutes to 1 hour of playing it cutts off the speakears relay, everything else is powered but no connection to the speakers. Can someone give me a hint were to look ? I have the service manual I have seached the forum and found nothing about this amp. Thanks Ric

27th September 2009, 04:21 PM	#2
eyoung diyAudio Member Join Date: Aug 2007 Location: Sunny SC,USA 15 min south of Charlotte NC	This is usually caused by DC on the speaker output. If you or another abliging soul could post a schematic maybe one the smart guys on the list could posit a possible cure... Regards Y,all, Elwood __________________ "when you open your mind to the imposible, soon you will find the truth...."

27th September 2009, 04:39 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	find the pins on the speaker relay that have the input signal on them. Check the DC output offset voltage while the amp is cold, again after 15 minutes of warm up time and finally after it has shut down. __________________ regards Andrew T.

27th September 2009, 06:05 PM	#6
RS232 diyAudio Member Join Date: Jan 2006 Location: Swindon	Thanks to all I have the service manual but thanks for the offer. What makes me think is that it never gets hot, there are lots of ventilation holes and it only get slightly warm Will check for dry joint for start and go on from there. Thanks again Ric Last edited by RS232; 27th September 2009 at 06:08 PM.

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27th September 2009, 05:04 PM	#4
big jim diyAudio Member Join Date: Feb 2006 Location: london	hi i have the service manual pm me and i will send you a copy

27th September 2009, 05:23 PM	#5
Mooly diyAudio Member Join Date: Sep 2007	Might be more simple than that with any luck... check for dry joints on any power transistors/regulators that run hot. Had that with a Pioneer A80 years ago. If it is a DC fault you need to determine which channel is duff. You can connect an LED across a bridge rectifier (one for each channel) together with appropriate limiting resistor and connect to output (before the relay) and ground. Any DC fault of either polarity will illuminate the LED on the duff channel. If it's not a dry joint then B-E junctions going intermitent open circuit are favourite

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