Maintenance; Troubleshooting - Liemke MERLIN-42 2020 Mode D'emploi

18. MAINTENANCE

Maintenance should be carried out at least twice a year and
consist of the following actions.
> Wipe the external surfaces of metal and plastic parts free of
dust and dirt with a cotton cloth. Silicone grease may be used
for this.
> Clean the electrical contacts of the unit using a non-greasy
organic solvent.
> Check the glass surfaces of the eyepiece and the lens. If neces-
sary, remove dust and sand from the lenses (preferably using a
non-contact method). Cleaning of the external surfaces of the
optic should be done with substances designed especially for
this purpose.

19. TROUBLESHOOTING

This table lists all the problems that may arise when operating the
device.
> Carry out the recommended checks and repairs in the order
shown in the table.
> If a defect should occur that is not listed in the table, or if it is
impossible to repair the defect yourself, the device should be
returned for repair.