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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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Fender Passport 150
Hi, some of you may be familiar with this all Chinese design badged "Fender". http://edu.znate.ru/tw_files2/urls_2..._m3d62dc1a.jpg Odd looking but quite functional with a pair of 80W Hitachi mosfet amplifiers and inside a regulated SMPS in the bottom of main unit. One arrive last week *dripping water* out the main unit and both speakers - seems it had been caught in a flood about 10 days previously and was immersed up to the line of the XLR sockets. ( Why do people think it OK to let the water remain inside and do its worst for so long ?? ) Got the speakers apart first, removed the four drivers, towelled off the surface water and let the lot sit out in the sun for a couple of days. It had become rather smelly and the only fix I know is sunlight. Next, the main unit ( also smelly) had to be completely disassembled, a huge number of screws involved, to gain access the SMPS which has its own enclosure right at the bottom - it was still soaking wet. Pulled out the PCB and fan and gave that a good wash in the sink followed by a half hour in the oven at about 80C. The PCB need scrubbing to remove the white residue of dissolving solder - as did the amp PCB. Used up plenty of PCB spray cleaner and then applied WD40 with a soft brush to every metal surface and connector. Then left it all out in the sun too. Tested the SMPS first with a dummy load and blow me down it worked fine. Attached the rest of the electronics and they worked OK too. Re-assembled and tested the speakers and found they had also survived. Naturally, I let the main unit run for many hours to make sure there were no issues with hidden moisture. On informing the customer of my success he asked: " was there much to do" ? ..... Phil |
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