Figure 1-7 Switches (product) PS4 PS1 M8001 SW501 PS8001 SL1 PS2 PS225 PS215 PS205 PS502 M8002 PS3 SL2 SW235 Table 1-6 Switches (product) 10 Chapter 1 Theory of operation ENWW Item Description SW235 Cassette presence switch SW501 Cartridge-door switch