18 Aug
2015
18 Aug
'15
5:14 a.m.
Well, in the process of repairing the Altos power supply I managed to
break the center lead off of the TIP31A that feeds the 2N3055 series
pass transistor. This time, I need to order parts.
Do you? The centre lead (collector) is connected to the tab on that transistor. So a
solder tag under the mounting screw (against the tab, not on top of an insulating bush
linked to the appropriate pad on the PCB should fix it.
Looking at the parts diagram, I think I'll pull
the spindle apart while waiting for my power supply parts, and see how
hard it would be to replace the bearings. Not all that hard, I'd think.
It's quite easy on every drive I've had apart.
The ball races are going to be standard sizes. You need to measure the outside diameter,
inside diameter (or the diameter of the spindle, which is a lot easier) and thickness.
Over here there are companies that just sell ball and roller bearings. If you go to the
trade
counter they will measure up the old bearings for you and find replacements most of the
time.
-tony