What's the DC voltage on the speaker terminals? Check all of them. I'm assuming that the relay is engaging.
the ticking starts first, can just hear it, then the relay engages, and the ticking continues,
plus the ticking can be heard from the amp section, the relay in at the PSU section.
ill measure when i get back from work.
Thanks,
David
plus the ticking can be heard from the amp section, the relay in at the PSU section.
ill measure when i get back from work.
Thanks,
David
1.9 volts between pos and negative, the negative terminal if connected to one of the fet rails.. any ways would RCA ground be a good reference point to test?
David
just tested.
Between positive terminal and ground:
2vac, 1.6vdc
between negative terminal and ground:
6vac, 2.9vdc
David
just tested.
Between positive terminal and ground:
2vac, 1.6vdc
between negative terminal and ground:
6vac, 2.9vdc
Last edited:
The secondary center tap of the power transformer is the best reference point. If you read 1000 ohms between the RCA shield and the amp's ground terminal (no RCAs plugged in), you should be able to use the RCA shield.
I think the IC may have simply failed. Power the amp up one more time and push on various points in the board. Does the voltage on the speaker terminals go fully to ground or fully to rail (~80v)? If not, replace the IC.
Hey Perry,
i found this thread here about a bx1500 that had same problems and symptoms as mine.
I went ahead and ordered the HIP4080 last night. ill post the results when it gets here.
mean while thank you loads for the help! you are a master!!
Thanks,
David
i found this thread here about a bx1500 that had same problems and symptoms as mine.
I went ahead and ordered the HIP4080 last night. ill post the results when it gets here.
mean while thank you loads for the help! you are a master!!
Thanks,
David
got the 4080 replaced.
powered it up. no speaker or input connected. all good.
powered down. plug in speaker and RCA cable, still no signal source connected.
i turn on, lots of current draw, humming from speaker. disconnect RCA and power up again, no current draw no humming.
now.. plugged in the RCA with an mp3 player. power it up, no current draw thats too high, but no music..
this is complicated..
Thanks,
David
powered it up. no speaker or input connected. all good.
powered down. plug in speaker and RCA cable, still no signal source connected.
i turn on, lots of current draw, humming from speaker. disconnect RCA and power up again, no current draw no humming.
now.. plugged in the RCA with an mp3 player. power it up, no current draw thats too high, but no music..
this is complicated..
Thanks,
David
If there is no DC votlage on the RCA shield (black meter probe on the amp's main ground terminal), try connecting the RCA shield to the amp's ground terminal with a jumper wire (preferably via a 1 amp fuse). Do you have audio with that jumper in place?
Have you tried operating all of the controls on the amp through their entire range to see if it would pass audio?
Is the relay engaging?
Have you tried operating all of the controls on the amp through their entire range to see if it would pass audio?
Is the relay engaging?
kept on testing after i posted the reply, i kept on testing, knocked the board a bit, it would draw alot of current, after knocking around a bit more, the relay stopped engaging.
when i get home from work ill test the rca terminals for dc volts and so on.
thanks,
David
when i get home from work ill test the rca terminals for dc volts and so on.
thanks,
David
okay. relay is engaging again. no current draw.. from center tap to rca ground i get nothing, from batt ground to rca i get -1.4 volt dc.
David
David
It would be best if you installed a 15 amp fuse in the B+ line before you do any more testing.
With the 15 amp fuse inline and the amp on, twist the power transformers. Does that cause excessive current draw?
Does pushing on the board near the output transistors cause excessive current draw?
With the 15 amp fuse inline and the amp on, twist the power transformers. Does that cause excessive current draw?
Does pushing on the board near the output transistors cause excessive current draw?
okay.. had a little pop... kinda got a fright!!!
put a fuse in. twisted the transformers and nothing happend. pushed near the output transistors, nothing happend. pushed near the preamp section and got a big spark under the board, and a pop from the speaker. cut power straight away..
put a fuse in. twisted the transformers and nothing happend. pushed near the output transistors, nothing happend. pushed near the preamp section and got a big spark under the board, and a pop from the speaker. cut power straight away..
There may be a short between an uncut lead and the heatsink. Look between the board and the heatsink with a flashlight to see if you see a short.
It's also possible that there is a missing insulator if the amp has an LED board under the main board.
It's also possible that there is a missing insulator if the amp has an LED board under the main board.
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