My TZ87 will not mount any tapes, saying they are not labelled when I know
they are. It could be simply a faulty drive. However I wonder if it might
not simply need the heads cleaning. I do not have a cleaning tape. I can't
see an easy way of getting at the heads. The block holding the heads is
mounted with what looks like to two Allen bolts. Would I be risking more
damage by removing the two Allen bolts and attempting to clean the heads
with isopropyl alcohol?

Thanks

Rob