Set Of O-Ring For Waterproof - Toho Electronics TRM20A Operation Manual

2.2 Set of O-ring for waterproof

When the factory is shipped, O-ring for the waterproof is not installed. When the waterproof and
dustproof uses it by the necessary environment, please install it according to the figure below.
O-ring for waterproof
It is not abnormal though the opening and shutting operation of the cover
CAUTION
becomes very hard if O-ring for the waterproof is installed.
2-3