Arcam AVP700 - turns off at random

turbov6 · 5th March 2010, 06:26 PM

Has anyone repaired an Arcam AVP700? I have one that turns off by itself in random. I have read where there are known issues with the power supply. I have isolated it to the unit itself - as it turns off in random with nothing else plugged into it. Sometimes, it will turn off within 10 seconds, other times it will stay on for a few minutes. Any ideas?

audioDIYer · 7th March 2010, 08:41 PM

I had problems with a AVR200. DC at the output of one of the amps. Check if you have any DC over 100mV.

bernification · 7th March 2010, 11:10 PM

I have a problem with an avr200. My girlfriend shorted one side by inadvertantly striping the speaker cable about 2 1/2 inches hahaha.

Replaced the devices and now have some problems with dc, I'm guessing, as the amp automatically goes into fault mode.

How did you solve it audioDIY?

Cheers

bernification · 8th March 2010, 10:27 AM

Turbo, does the avp have power outs, or just line outs?

If it just has pre outs, it's not likely to have the same problem as myself and audioDIY have/had.
I will have a look at my avr today and see if I can find anything out.

audioDIYer · 11:30 AM

The dead components have a red circle.

R524 (open) was the DC offset cause after replacing all transistors.

turbov6 · 8th March 2010, 03:42 PM

bernification, the AVP700 is preamp out only.

bernification · 8th March 2010, 05:24 PM

Thanks audio, checked the board and found an additional resistor down- I had replaced a few.
Will check it out after work this evening.

Here's hoping

Cheers

bernification · 9th March 2010, 07:41 PM

Turbo, can you isolate different modules from the psu?

I would try and isolate and see which one sends it into fault mode.

I have done this with my avr, and found that a resistor in the power amp module has gone high- sending the amp into fault mode

Cheers

bernification · 9th March 2010, 09:59 PM

Thanks audioDIY,

that snippet of diagram and your reminder to check the resistors (d'oh) have breathed new life into the avr!

Cheers

turbov6 · 10th March 2010, 01:48 AM

Bernie,

I took a look inside around the mains input. I read where somebody had the same issue with diodes D113 ~ D116 that were replaced by Arcam to correct this issue. I replaced all of these plus four more that were nearby and looked like they might have had high heat for some time. Still no luck - powers down in random. (Just to clarify, the unit literally powers off. It does not power down the normal "Standby" first). It is like all power is lost instantly.

5th March 2010, 06:26 PM	#1
turbov6 diyAudio Member Join Date: Mar 2010	Arcam AVP700 - turns off at random Has anyone repaired an Arcam AVP700? I have one that turns off by itself in random. I have read where there are known issues with the power supply. I have isolated it to the unit itself - as it turns off in random with nothing else plugged into it. Sometimes, it will turn off within 10 seconds, other times it will stay on for a few minutes. Any ideas?

7th March 2010, 11:10 PM	#3
bernification diyAudio Member Join Date: Dec 2005 Location: london	I have a problem with an avr200. My girlfriend shorted one side by inadvertantly striping the speaker cable about 2 1/2 inches hahaha. Replaced the devices and now have some problems with dc, I'm guessing, as the amp automatically goes into fault mode. How did you solve it audioDIY? Cheers __________________ Bernie.

8th March 2010, 10:27 AM	#4
bernification diyAudio Member Join Date: Dec 2005 Location: london	Turbo, does the avp have power outs, or just line outs? If it just has pre outs, it's not likely to have the same problem as myself and audioDIY have/had. I will have a look at my avr today and see if I can find anything out. __________________ Bernie.

8th March 2010, 05:24 PM	#7
bernification diyAudio Member Join Date: Dec 2005 Location: london	Thanks audio, checked the board and found an additional resistor down- I had replaced a few. Will check it out after work this evening. Here's hoping Cheers __________________ Bernie.

9th March 2010, 07:41 PM	#8
bernification diyAudio Member Join Date: Dec 2005 Location: london	Turbo, can you isolate different modules from the psu? I would try and isolate and see which one sends it into fault mode. I have done this with my avr, and found that a resistor in the power amp module has gone high- sending the amp into fault mode Cheers __________________ Bernie.


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7th March 2010, 08:41 PM	#2
audioDIYer diyAudio Member Join Date: Dec 2005 Location: At work	I had problems with a AVR200. DC at the output of one of the amps. Check if you have any DC over 100mV.

8th March 2010, 03:42 PM	#6
turbov6 diyAudio Member Join Date: Mar 2010	bernification, the AVP700 is preamp out only.

9th March 2010, 09:59 PM	#9
bernification diyAudio Member Join Date: Dec 2005 Location: london	Thanks audioDIY, that snippet of diagram and your reminder to check the resistors (d'oh) have breathed new life into the avr! Cheers __________________ Bernie.

10th March 2010, 01:48 AM	#10
turbov6 diyAudio Member Join Date: Mar 2010	Bernie, I took a look inside around the mains input. I read where somebody had the same issue with diodes D113 ~ D116 that were replaced by Arcam to correct this issue. I replaced all of these plus four more that were nearby and looked like they might have had high heat for some time. Still no luck - powers down in random. (Just to clarify, the unit literally powers off. It does not power down the normal "Standby" first). It is like all power is lost instantly.

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