electronics engineering notes
Friday, June 7, 2019
Fixing Bose Quietcomfort 35
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Short version: Bose Quietcomfort won't turn on - open it and check if a plastic piece sitting on the switch is intact. Bose Quietcomf...
Sunday, May 19, 2019
Fixing VOX AD60 VT guitar combo
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The VOX AD60 VT blown the main fuse when turned on. I received it with a comment that someone has already tried repairing it. After opening...
Wednesday, April 3, 2019
EMC Troubleshooting speaker relay matrix
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There is relay a matrix designed to switch between active and passive speakers in a music shop. There are actually two matrices, each in a ...
Thursday, March 14, 2019
Fixing Dell 2400MP projector with power supply PA-4331-1D-LF
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Power, temp and lamp control lights are continuously on when projector is turned supplied. Nothing changes after pressing power button. In ...
Monday, March 11, 2019
Fixing tube amplifier Suprem Concort 80
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The amplifier came with a note that it doesn't turn on. Control lamps remain dark after flipping the switch. The reason for that was d...
Wednesday, March 6, 2019
Fixing Allen & Heath Zed 420 mixer
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The mixer was turned on 24 hours a day for around two years. After that time once its LEDs were not as bright as in the past and the signal ...
Monday, March 4, 2019
Fixing acoustic research Phantom Sub 12D
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In the subwoofer there is one externally available fuse and two built in fuses which protect symmetrical low voltage supply for the analo...
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