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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
Posted to sci.electronics.repair,sci.electronics.design
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Mackie SR24.4
Does anyone have any experience with the Mackie SR24.4
A customer asked if I could repair one which he said had a power issue. So I was hoping for an easy power supply repair but on opening it I find this in channel 11. s651.photobucket.com/user/jbloggs2/library Sorry Mr Customer I don't think it's going to be repairable. |
#2
Posted to sci.electronics.repair
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Mackie SR24.4
John Smith wrote:
Does anyone have any experience with the Mackie SR24.4 A customer asked if I could repair one which he said had a power issue. So I was hoping for an easy power supply repair but on opening it I find this in channel 11. s651.photobucket.com/user/jbloggs2/library Sorry Mr Customer I don't think it's going to be repairable. ** It might take a bit of time and work, but that looks repairable to me. Mackie don't bother to de-couple each channel with fusible resistors in case of a short. Op-amps can be the cause and then PSU delivers up to 20 watts of heat into one - starting a small fire. I would start by removing all the burnt parts and seeing if the PSU fault is cleared. .... Phil |
#3
Posted to sci.electronics.repair
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Mackie SR24.4
"Phil Allison" wrote in message
... John Smith wrote: Does anyone have any experience with the Mackie SR24.4 A customer asked if I could repair one which he said had a power issue. So I was hoping for an easy power supply repair but on opening it I find this in channel 11. s651.photobucket.com/user/jbloggs2/library Sorry Mr Customer I don't think it's going to be repairable. ** It might take a bit of time and work, but that looks repairable to me. Mackie don't bother to de-couple each channel with fusible resistors in case of a short. Op-amps can be the cause and then PSU delivers up to 20 watts of heat into one - starting a small fire. I would start by removing all the burnt parts and seeing if the PSU fault is cleared. Yes I probably could repair it by cutting out the burn, bridging the tracks, and remaking the circuit on the back of the board with a DIP version of the opamp (if it's a failed opamp) and the relavant components. However the customer has decided not to go that far and just wants the channel 1-14 board disconnected. ... Phil |
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