Dear Sir,
I have a problem with one of my MA5000VZ amps.
When I turn on the unit with no speaker nor signal connected to the amp, all things turn on and off as normal. When I connect the speakers to the speaker terminals, the IOC light on one of the channels will turn on (no audio cables connected)!
When i connected audio cables (signal) to the amp (no speakers connected) , the moment I turn the volume, the IOC light will turn on, on the troubled channel.
The problem is with only one channel.
Can you elaborate where the problem might be, by the way none of the red lights inside the amp. will go on, so no problem here.
Thank you in advance.
Renard Hurtado
1
MA5000 failure
Started by Renard, Feb 20 2006 01:15 PM
4 replies to this topic
#2
DGlass
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Posted 22 February 2006 - 12:47 PM
IOC is an Input/Output Comparator circuit that is looking for any difference in signal greater than 0.05% other than amplitude. It is basically saying there is something on the output that shouldn't be there and the amp is going into protection. Not having it on a bench and looking at it ,however...... it would be very hard to say what exactly the issue is. It could be several things from a bad component on the main board to a bad output device.
I would recommend you get it in for service to either us or to a qualified Crown Authorized Factory Service Center.
I would recommend you get it in for service to either us or to a qualified Crown Authorized Factory Service Center.
#3
Renard
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Posted 23 February 2006 - 11:01 PM
[Hi,
Thanks for your reply.
Since yesterday this amp. started working Ok again, I really don`t know what happened. This week-end I will be using in during the Carnival parade, which means five to six hours none stop music, at full power. This same problem I noticed on an old Ma-2400 (8 years old), that I use only twice or three times a year. When i powered it up, it took some time for the ODEP (red lights) to come on. then i thought it was Ok, but when powering up the next day, it seemed like a relay or so on one of the channel was going crazy, because the IOC light started going on and off, and the ODEP light went out. I opened up the amp. used an air compressor to blow it clean, and today when I turned it on, it was working normal again. This amp. will be in the parades to, let`s hope for the best.
Regards,
Renard Hurtado
Thanks for your reply.
Since yesterday this amp. started working Ok again, I really don`t know what happened. This week-end I will be using in during the Carnival parade, which means five to six hours none stop music, at full power. This same problem I noticed on an old Ma-2400 (8 years old), that I use only twice or three times a year. When i powered it up, it took some time for the ODEP (red lights) to come on. then i thought it was Ok, but when powering up the next day, it seemed like a relay or so on one of the channel was going crazy, because the IOC light started going on and off, and the ODEP light went out. I opened up the amp. used an air compressor to blow it clean, and today when I turned it on, it was working normal again. This amp. will be in the parades to, let`s hope for the best.
Regards,
Renard Hurtado
#4
sidrambill
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Posted 29 June 2006 - 04:41 PM
QUOTE(Renard @ Feb 24 2006, 12:01 AM)
[Hi,
Thanks for your reply.
Since yesterday this amp. started working Ok again, I really don`t know what happened. This week-end I will be using in during the Carnival parade, which means five to six hours none stop music, at full power. This same problem I noticed on an old Ma-2400 (8 years old), that I use only twice or three times a year. When i powered it up, it took some time for the ODEP (red lights) to come on. then i thought it was Ok, but when powering up the next day, it seemed like a relay or so on one of the channel was going crazy, because the IOC light started going on and off, and the ODEP light went out. I opened up the amp. used an air compressor to blow it clean, and today when I turned it on, it was working normal again. This amp. will be in the parades to, let`s hope for the best.
Regards,
Renard Hurtado
Thanks for your reply.
Since yesterday this amp. started working Ok again, I really don`t know what happened. This week-end I will be using in during the Carnival parade, which means five to six hours none stop music, at full power. This same problem I noticed on an old Ma-2400 (8 years old), that I use only twice or three times a year. When i powered it up, it took some time for the ODEP (red lights) to come on. then i thought it was Ok, but when powering up the next day, it seemed like a relay or so on one of the channel was going crazy, because the IOC light started going on and off, and the ODEP light went out. I opened up the amp. used an air compressor to blow it clean, and today when I turned it on, it was working normal again. This amp. will be in the parades to, let`s hope for the best.
Regards,
Renard Hurtado
#5
sidrambill
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Posted 29 June 2006 - 04:58 PM
QUOTE(Renard @ Feb 20 2006, 02:15 PM)
Dear Sir,
I have a problem with one of my MA5000VZ amps.
When I turn on the unit with no speaker nor signal connected to the amp, all things turn on and off as normal. When I connect the speakers to the speaker terminals, the IOC light on one of the channels will turn on (no audio cables connected)!
When i connected audio cables (signal) to the amp (no speakers connected) , the moment I turn the volume, the IOC light will turn on, on the troubled channel.
The problem is with only one channel.
Can you elaborate where the problem might be, by the way none of the red lights inside the amp. will go on, so no problem here.
Thank you in advance.
Renard Hurtado
I have a problem with one of my MA5000VZ amps.
When I turn on the unit with no speaker nor signal connected to the amp, all things turn on and off as normal. When I connect the speakers to the speaker terminals, the IOC light on one of the channels will turn on (no audio cables connected)!
When i connected audio cables (signal) to the amp (no speakers connected) , the moment I turn the volume, the IOC light will turn on, on the troubled channel.
The problem is with only one channel.
Can you elaborate where the problem might be, by the way none of the red lights inside the amp. will go on, so no problem here.
Thank you in advance.
Renard Hurtado
Renard, I'm having the same problem with a macrotech 1200. I do get a muddled signal on the bad channel and would like to know what your solution was/is. There should be someplace we can stick the probes on a meter to see what is supposed to be doing what. If it were a moving light I would know what to do but this audio thing seems to be all electronic with no moving parts other than a couple of relays and a fan. Thanks, Bill
