Patent ID: 7889508

Claim:
A plug-in unit-mounting structure for mounting plug-in units each having various circuit packages mounted on a printed board thereof, the structure comprising: a shelf comprising a back wiring board, and connectors and guide pins disposed separately on said back wiring board, the connectors being located for engagement with the plug-in units; and a mounting frame, removably fixed to said shelf before receiving any plug-in units, that receives at least one plug-in unit in a state in which the plug-in unit is fitted to an associated one of said connectors, the mounting frame including: a vertical frame part having upper and lower ends and a guide hole for positioning said mounting frame in said shelf, such that said guide hole is engaged with one of the guide pins disposed on said back wiring board; upper and lower frame parts respectively fixed to the upper and lower ends of the vertical frame part; and guide rails which are provided on the upper and lower frame parts and have a length based on a size of the plug-in unit.