3M™ Overhead Projector 1700 Series  Illustrated Parts Breakdown 
© 3M 2005.  All Rights Reserved.  14 
Top Cover Assembly Parts List 
(Serial Number 170000988 and below) 
Item 
No. 
3M 
Part Number 
Description  Qty.
1A  78-8114-9027-1  Top Cover Assembly, Single (Beige color)  1 
1B  78-8114-9021-4  Top Cover Assembly, Dual (Beige color)  1 
2  (Reference only)  Fresnel Lens (See note below)  1 
3 78-8120-2941-7 Bracket, Hinge  1 
4 78-8064-1515-0 Actuator Switch  1 
 
NOTE: 
If the machine currently has a single-element fresnel lens and a new fresnel is needed, two options are 
available: 
1.  Replace the top cover with the appropriate assembly listed in Section 7. 
2.  Install Kit #78-8121-4740-9.  This kit adapts single-element top covers to accept a dual-element 
fresnel lens. 
Refer to Technical Bulletin #10 for additional information.