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I have a nice old Revox A700 reel deck in here. A guy brought it in a long time ago, and it got trapped by my heart failure. My head wasn;t clear enough to figure it out, and the thing is really heavy, and I couldn;t lift it to the bench top. But as I clear things, I see it and realize I need to get it back to the customer, and I can lift it now, so I did. Figured I might as well see what it needs and maybe fix it.
Pulled the back off, a row of like ten fuses, went down them and found an open one. Without that fuse, the thing seemed to power up and the capstan motor spins. OH well, replace the fuse and let's see what happens. Hmmm, nothing happens. Same motor spinning and the unit sits there.... then 3...2...1... FOOF, huge clouds of white smoke billow out from behind something.
Ah, perhaps THAT is the problem. At least I now know where the problem is, at least part of it. managed to get the screws out of this and that to free that and this, and found a relay board in my hand. One of the half dozen 0.47uf 150vAC caps in the motor circuit had vented. Two hours later, my shop still stinks of cap steam. Looks like an RC with 4.7 ohm and a 0.47uf cap series across a reel motor winding.
Got nothing like that, so I'll try my loccal parts store in the morning.
Pulled the back off, a row of like ten fuses, went down them and found an open one. Without that fuse, the thing seemed to power up and the capstan motor spins. OH well, replace the fuse and let's see what happens. Hmmm, nothing happens. Same motor spinning and the unit sits there.... then 3...2...1... FOOF, huge clouds of white smoke billow out from behind something.
Ah, perhaps THAT is the problem. At least I now know where the problem is, at least part of it. managed to get the screws out of this and that to free that and this, and found a relay board in my hand. One of the half dozen 0.47uf 150vAC caps in the motor circuit had vented. Two hours later, my shop still stinks of cap steam. Looks like an RC with 4.7 ohm and a 0.47uf cap series across a reel motor winding.
Got nothing like that, so I'll try my loccal parts store in the morning.
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