Vinten Radamec 435H Pan & Tilt Head - Manual (Page 7)

V V i i n n t t e e n n B B r r o o a a d d c c a a s s t t L L t t d d . .
435H Technical Manual Page 6
Erratic and jerky operation can also be caused by the following :
1.
Noisy demand signal.
2. Noisy positional feedback potentiometer. Check and replace if necessary.
3. Faulty motor or tacho. Check and replace if necessary.
4. Loose timing belt drives. Check and tighten if necessary.
4.3. Dismantling the Head
Fit the tilt locking pin, set pan to its mid position by lining up the red dots on the pan
base and the main casting, and apply the pan brakes. Remove the payload so that if
necessary, the head may be transferred to a suitable working area.
All adjustments and replacements on tilt (except changing the motor), can be carried
out by just removing the back cover. To change the tilt motor or carry out any work
on pan, the main and base castings must also be separated.
A total of twelve M5 Hex socket screws (including four which secure it to the base
casting) hold the back cover in position. A further eight of these screws are used to
fix the base and main castings together. However, before any castings can be
separated, the brake knobs must be removed by undoing the screw at their centres.
Note that removal of the load platform, after marking its position, will make the main
casting easier to handle.
4.4. Replacing a Reset Potentiometer
Having gained access to the appropriate axis, replacing a reset potentiometer is the
same for either pan or tilt. Set the axis being worked on to its mid position and
unsolder the wires from the potentiometer terminals after having noted their coding
and position. Remove the three clamps holding the potentiometer body in position.
The potentiometer may now be removed by pulling it out of the 'O' rings, which retain
it in the end of the output shaft. These 'O' rings are a tight fit, so some effort may be
required, but avoid pulling the potentiometer from side to side.
If either of the three 'O' rings used on each axes is seen to have remained on the
potentiometer shaft, it should immediately be removed and fitted into the hole in the
end of the output shaft.
NOTE
NEVER ATTEMPT TO FIT A REPLACEMENT RESET POTENTIOMETER BY
PUTTING THE THREE 'O' RINGS ON ITS SHAFT. THEY MUST ALWAYS BE
FITTED INTO THE HOLE IN THE END OF THE OUTPUT SHAFT BEFORE THE
POTENTIOMETER IS FITTED.
Insert the shaft of the new potentiometer into the 'O' rings in the output shaft and
push it home onto its mounting plate. The potentiometer spigot is not a location fit in
the mounting plate so let the potentiometer centralise itself and then fit the three
clamps to hold it in position.
With the axis set to its mid point, centre the potentiometer using a DVM. This is done
by slipping the potentiometer shaft in the 'O' rings, until the correct setting is found.
Re-solder the wires to the potentiometer terminals.
After re-assembly, the head may now be removed to service.