aurban wrote:I have just purchased a second-hand Harman Kardon T45C turntable and the belt has disintegrated into lots of pieces due to age and fatigue I guess, so I'm not able to know 100% that I have all the pieces to reassemble it to work out the diameter before reordering the belt.
The Service Manual and User Manual also don't have this information.
Does anyone out there have the same turntable and can provide me with the thickness, width and diameter so I can pass this information on to a supplier?
Obtain a length of non-stretch string or thread. Wind it around the platter & pulley as tight as you can get it and tie it off. That will be your diameter. Derive this by dividing the developed total length by 3.14159 and you will be close enough. Subtract a few mm to allow for stretch.
If there is a groove both in the pulley and the platter, you may use an O-ring from any industrial supply house. If the pulley is either straight or concave beveled or cut ][, )( or ><, you may use an O-ring even if there is no notch or groove in the platter.
If the pulley is convex beveled (), you must use a flat belt - and there are sources for those at the diameter you develop.
Keep in mind that as a belt-drive system the rotational diameter of the pulley and the platter are all that matters - and the narrowest part of either for the first three options. For the last option, it is the widest part of the pulley - hence the need for a belt vs. O-ring. If there is a pitch control, you may use an O-ring in all cases as you will set to the strobe.
NOTE: There is _NOTHING_ magical or special about drive belts. Any of them. As long as they do not stretch overmuch, slip or get sloppy the $3 unit will perform exactly as well as the $30 unit - the major differences being the label on the package and the source.
Best of luck with it.
Melrose Park, PA