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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Behringer SL2442FX , mixer desk, 2004
This 24 ch mixer has been "repaired" twice for a very rare random fault.
Recurs months after being "repaired". Loss of L channel output at the XLR. Previous person had obviously looked at the most likely suspect of the 1/4 in sockets for insert , with bypass contacts and XLRs thmselves. Both Main/Sub push-push switches, 4 pole C/O are very suspect in the FX sections, half a mm pushing when out will loose the effects component of L or R channel and a bit more, full loss of one or both channels. Any other suspects to check? I'm surprised the schema are out there but minus smps so some details taken, just in case. switcher driver ? (reverse of pcb not explored) maybe designated 04N68, TO220 , usual 0/O possibility (obstructed viewing) other marking maybe 1M360 |
#2
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Behringer SL2442FX , mixer desk, 2004
googling around turned up
"Incidentally, on more than one occasion I have repaired a Behringer with this exact same symptom (no L ch), and it turned out that one of the main bus tracks runs right at the far right edge of the PCB from fader to output jack socket section. When the PCB was installed into the chassis, something sharp caught on the PCB and partially cut through the track, which eventually failed some time later." for when I get in there proper |
#3
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Behringer SL2442FX , mixer desk, 2004
"N_Cook" wrote in message ... googling around turned up "Incidentally, on more than one occasion I have repaired a Behringer with this exact same symptom (no L ch), and it turned out that one of the main bus tracks runs right at the far right edge of the PCB from fader to output jack socket section. When the PCB was installed into the chassis, something sharp caught on the PCB and partially cut through the track, which eventually failed some time later." for when I get in there proper I have also experienced this exact same problem, it is part of the casing that does the damage if you are not very careful when fitting the PCB. The track is VERY close to the edge. Gareth. |
#4
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Behringer SL2442FX , mixer desk, 2004
Gareth Magennis wrote in message
... "N_Cook" wrote in message ... googling around turned up "Incidentally, on more than one occasion I have repaired a Behringer with this exact same symptom (no L ch), and it turned out that one of the main bus tracks runs right at the far right edge of the PCB from fader to output jack socket section. When the PCB was installed into the chassis, something sharp caught on the PCB and partially cut through the track, which eventually failed some time later." for when I get in there proper I have also experienced this exact same problem, it is part of the casing that does the damage if you are not very careful when fitting the PCB. The track is VERY close to the edge. Gareth. Got into that panel now Although no observable damage to that trace, I may as well run a line // to this trace while in there. Looks like that mod, replace the 2 4p c/o sw , the 2 1/4 in sockets for Insert and at least remove the main slider , probably replace. Putting some alternate sets to the pins of the interboard headers, and keep fingers crossed. After that, should it bounce, I suppose its a matter of building an active buffer and LEDs as telltales , half way through the outer stages, to localise down a bit. I will try and advise the owner to swap to using the upper channels , in case its a problem earlier on. |
#5
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Behringer SL2442FX , mixer desk, 2004
"N_Cook" wrote in message ... Gareth Magennis wrote in message ... "N_Cook" wrote in message ... googling around turned up "Incidentally, on more than one occasion I have repaired a Behringer with this exact same symptom (no L ch), and it turned out that one of the main bus tracks runs right at the far right edge of the PCB from fader to output jack socket section. When the PCB was installed into the chassis, something sharp caught on the PCB and partially cut through the track, which eventually failed some time later." for when I get in there proper I have also experienced this exact same problem, it is part of the casing that does the damage if you are not very careful when fitting the PCB. The track is VERY close to the edge. Gareth. Got into that panel now Although no observable damage to that trace, I may as well run a line // to this trace while in there. Looks like that mod, replace the 2 4p c/o sw , the 2 1/4 in sockets for Insert and at least remove the main slider , probably replace. Putting some alternate sets to the pins of the interboard headers, and keep fingers crossed. After that, should it bounce, I suppose its a matter of building an active buffer and LEDs as telltales , half way through the outer stages, to localise down a bit. I will try and advise the owner to swap to using the upper channels , in case its a problem earlier on. |
#6
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Behringer SL2442FX , mixer desk, 2004
Got into that panel now Although no observable damage to that trace, I may as well run a line // to this trace while in there. Looks like that mod, replace the 2 4p c/o sw , the 2 1/4 in sockets for Insert and at least remove the main slider , probably replace. Putting some alternate sets to the pins of the interboard headers, and keep fingers crossed. After that, should it bounce, I suppose its a matter of building an active buffer and LEDs as telltales , half way through the outer stages, to localise down a bit. Should it bounce, I suggest you get the owner to buy a new one with a 3 year warranty for £240. http://www.thomann.de/gb/behringer_s...kanalmixer.htm Probably far more cost effective than hours of repair bills plus parts on an 8 year old mixer probably worth something like £70 in good nick on ebay. Gareth. |
#7
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Behringer SL2442FX , mixer desk, 2004
Force on the 0.25 socket L insert sw about 700gm, to break contact, about
1400 gm on the R to break contact is a bit suspicious. Normally I would expect problems in the order of 300 or 400 gram contact force. Found a pair of 4w c/o switches to fit in the 13.5mm of clearance space. |
#8
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Behringer SL2442FX , mixer desk, 2004
To desolder the 4p c/o switches you need to sling .6mm wire under the sw
body and pulling when desoldering. Normal clamp force over the body is enough to break-up the casing of these very weak switches. At least I could see inside and no wonder they're problematic. |
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