Boss Audio REV 3000 in protect - Page 6

bigpun4fubu · 3rd January 2012, 12:34 AM

what voltages should i look for?

Perry Babin · 3rd January 2012, 01:01 AM

D307 and 308 are likely the RP diodes. They should read the same as when you measure the resistance across the B+ and ground terminals.

There's no easy way to test the 4080.

bigpun4fubu · 3rd January 2012, 01:13 AM

they made very unstable readings with both polarities (swapping probes around on each)

bigpun4fubu · 3rd January 2012, 10:49 PM

the RP diodes out of circuit read .359v on diode check 18.29k ohms and OL reversed they good???

they are FR605's

bigpun4fubu · 5th January 2012, 11:35 PM

according to your diode testing procedure if it measures less than .5v and more than .9 its considered defective?

Perry Babin · 6th January 2012, 02:15 AM

Isn't that value given for P-channel FETs, and not diodes?

bigpun4fubu · 6th January 2012, 10:21 PM

yeah youre right duh I wasnt thinking , so they are good then

Perry Babin · 6th January 2012, 11:27 PM

Yes

bigpun4fubu · 7th January 2012, 01:56 AM

hmm

richto · 14th April 2012, 09:42 AM

I work on Boss Audio all the time. If it blows fuses as soon as you apply power, without the remote connection powered then most likely you have a short circuit transistor in the PSU stage.

With these amplifiers, failure is almost always due to excessive heat caused by powering the amplifier inadequately. Too low a supply voltage will cause the amplifier to draw too much current and fry itself.

Therefore in the case of blown transistors, you should always replace the complete bank, not just the failed one as likely all transistors near by are also damaged.

It is unusual to have to replace driver stage transistors, etc. almost always it it the PSU or amplifier output stages that fail to short circuit.

3rd January 2012, 01:01 AM	#52
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	D307 and 308 are likely the RP diodes. They should read the same as when you measure the resistance across the B+ and ground terminals. There's no easy way to test the 4080. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

6th January 2012, 02:15 AM	#56
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Isn't that value given for P-channel FETs, and not diodes? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

6th January 2012, 11:27 PM	#58
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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3rd January 2012, 12:34 AM	#51
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	what voltages should i look for?

3rd January 2012, 01:13 AM	#53
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	they made very unstable readings with both polarities (swapping probes around on each)

3rd January 2012, 10:49 PM	#54
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	the RP diodes out of circuit read .359v on diode check 18.29k ohms and OL reversed they good??? they are FR605's

5th January 2012, 11:35 PM	#55
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	according to your diode testing procedure if it measures less than .5v and more than .9 its considered defective?

6th January 2012, 10:21 PM	#57
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	yeah youre right duh I wasnt thinking , so they are good then

7th January 2012, 01:56 AM	#59
bigpun4fubu diyAudio Member Join Date: Oct 2010 Location: Florence, Alabama	hmm

14th April 2012, 09:42 AM	#60
richto diyAudio Member Join Date: Nov 2008	I work on Boss Audio all the time. If it blows fuses as soon as you apply power, without the remote connection powered then most likely you have a short circuit transistor in the PSU stage. With these amplifiers, failure is almost always due to excessive heat caused by powering the amplifier inadequately. Too low a supply voltage will cause the amplifier to draw too much current and fry itself. Therefore in the case of blown transistors, you should always replace the complete bank, not just the failed one as likely all transistors near by are also damaged. It is unusual to have to replace driver stage transistors, etc. almost always it it the PSU or amplifier output stages that fail to short circuit.

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