Hi All, A friend has bought a Zeiss TM mount that he's having problems with. He doesn't "do" the internet so i've been tasked with finding information, i'll describe the issue first.
With the mount plugged in and the arched cover removed he marked the gears which he says are turning, he's locked the RA (hour) setting circle which isn't turning. He's tried locking the red RA knob that provides the slow mo lock but that also makes no difference. He's tried it with the OTA in place to provide load and he's tried it with no load but still no movement from the drive. He says the slow mo controls work fine with and without load. I've told him to undo the 4 screws on the RA cover that hold the Dec assembly but he's reluctant to do so without knowing what's inside. I'm thinking it's a clutch issue (if there is one) or a gear not engaging with it's shaft properly or maybe even a stripped gear if it's been rough handled.
So, for the last few hours i've trawled the internet, i've found pictures of the gearbox under the arched cover but little else (as shown below). There appear to be no manuals available or instructions on how to adjust anything inside the drive. Has anyone here got a schematic view or pics of the inside of the RA head? or adjustment Instructions . The pictures i do have are only of the gearbox/motor side so i haven't a clue what's inside the RA cover. Thanks in advance for any help.