IBM PCjr Hardware Maintenance And Service page 282

System Unit
System Unit Top Cover Removal 100
1. Set the system unit's Power switch to Off.
2. Gently pry up the rear comers and middle of the top
cover at points 0.
3. Lift the rear edge of the top cover xmtil its tabs are
clear of the bottom cover.
4. Shde the top cover toward the rear and up.
Power Switch
System Unit 4-100-1