Fault finding
MH20 and MH20i
Poor measuring performance:
Possible cause
Remedy
Loose mounting.
Ensure shank mounting screws are tight and mounting to CMM is
secure.
Problem with TP20 probe module (see 'TP20 installation').
Diagnosis of the probe unit should be carried out with axes correctly
locked and without head adjustment between probe points.
Problem with swivelling / indexing unit.
Diagnosis of indexing unit should only be carried out following
confirmation of satisfactory probe performance.
No probe signal and / or no probe status LED:
Possible cause
Remedy
Cable faulty / not connected.
Check continuity of cabling from head to interface / machine control.
Probe interface faulty / not connected.
Ensure correct connection of interface/machine control.
Poor repeatability (MH20i only):
Possible cause
Remedy
Axes lock procedure incorrect.
Ensure lock lever is fully rotated to lock position.
Axes unlock procedure incorrect.
Ensure lock lever is fully rotated to unlock position during indexing.
Forces imparted onto head during lock-up.
Unlock and re-lock holding lock lever only.
Attempted lock-up in incorrect un-qualified position.
Unlock, reposition correctly and re-lock.
Axes ‘rattling' during indexing ﴾MH20i only﴿:
Possible cause
Remedy
Incorrect unlock procedure.
Ensure lock lever is fully rotated to unlock position.
Incorrect indexing procedure.
Index each axis separately.
NOTE:
The MH20 and MH20i are not user serviceable and should be returned to Renishaw if suspected faulty.
MH20 and MH20i user's guide
www.renishaw.com
Issued 07 2019
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