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3M™ Overhead Projector 1800 Illustrated Parts Breakdown
© 3M 2004 17
Top Cover Assembly Parts List (with clipped-in stage glass)
Item 3M Part Number Description Qty.
1A 78-8120-8570-8 Top Cover Module, Basic (U.S) 1
1B 78-8120-8571-6 Top Cover Module with Lamp Changer and Clock (U.S.) 1
1C 78-8120-8568-2 Top Cover Module, Basic (A4) 1
1D 78-8120-8569-0 Top Cover Module with Lamp Changer and Clock (A4) 1
2 78-8120-4155-2 Glass, Stage 1
3 78-8005-0481-9 Spring, Compression 1
4 78-8079-8768-6 Latch, Top Cover 1
5 78-8120-3114-0 Retainer, Fresnel 4
6 78-8120-8504-7 Fresnel, Dual Element – 182.5 mm 1
7A 78-8120-3138-9 Button, On/Off, Red (See Section 7) 1
7B 78-8120-3151-2 Button, On/Off, Blue (See Section 7) 1
8A 78-8120-8563-3 On/Off Button Kit, Red (Not shown) 1
8B 78-8120-8564-1 On/Off Button Kit, Blue (Not shown) 1
Note: Top covers prior to S/N 18023074 have taped-in
stage glass. If the stage glass needs repair, a new top cover
must be ordered. Refer to 1800 Technical Bulletin #6.