IBM 310ED - Manual (Page 69)

CD-ROM Drive (Model Unique)
Warning: Do not open the CD-ROM; no user adjustments
or serviceable parts are inside. Use of controls,
adjustments, or the performance of procedures other than
those specified may result in hazardous radiation
exposure.
Figure A
Figure B
ThinkPad 310, 310D, 310E, 310ED (2600) 45