Well, I finally managed the almost impossible and changed the belts on my old Beocord 5000 - the 70's dual capstan model 4705 (or 4715). This is my story so far - still some mechanical adjustments to do!
(This is part 2 of the series, as I remembered to take photos only after I opened up the deck and started to dig into the cassette mechanism itself. The part 1 containing the deck disassembly will follow...)
This part 2 starts with disassembled deck, the cassette mechanism separated from the chassis but not from the wiring (except the tapehead bridge socket). Belt replacement is done with the soldered wiring in situ. The service manual covers replacement of the belts only partially, as it totally ignores the main (flat) drive belt.
Here I have highlighted the first steps to do: Firstly, remove the recording solenoid assembly on the right of the picture, two screws. At the same time You can take the third screw (in the middle of the two, behind the wiring socket in the picture) out. Taking this solenoid out is needed when changing the main drive belt.
Next take off all springs on both sides of the cassette mechanism, with associated arms and clips. There are 4 springs on left side and 3 more on right plus one under the mechanism. Note, mark and write down (or take pictures) the correct place of each spring!
Then take out the 2 roller arms, hold in place with locking rings (c-clips).
Then take out locking rings and rivets (left highlight on the picture) on both sides, and screws and spacers (right-hand hightlight) also on both sides of the mechanism. Note that the screw on the right side is longer and has two nuts (going thru an control arm as well).
Now the whole cassette holder (big black plastic part!) can be lifted off.
Then remove the screw and associated arm assembly shown here (on the right-hand highlight).
And next the upper square belt and its cord pulley with its locking ring.
