COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)Table 10-501CHAPTER 10 TROUBLESHOOTING10-71NamePhoto-interrupterPhotosensorNotation DescriptionPS1 Registration paper sensorPS3 Developing rotary position sensorPS5 Separation sensorPS10 Face-down tray full paper sensorPS11 Face-down tray delivery paper sensorPS17 Pick-up assembly paper sensorPS18 Pick-up unit cover sensorPS19 Multifeeder tray last sheet sensorPS30 Upper left cover sensorPS1201 Cassette 2 sensorPS1202 Cassette 1 sensorPS1203 Cassette 2 paper level sensor 2PS1204 Cassette 2 paper level sensor 1PS1205 Cassette 1 paper level sensor 2PS1206 Cassette 1 paper lever sensor 1PS1207 Cassette 2 paper absent sensorPS1208 Cassette 1 paper absent sensorPS1301 Multifeeder tray paper sensorPS1302 Holding plate position sensorPS29 Cassette 1 last paper sensorPS1801 Transparency sensor 1PS1802 Transparency sensor 2PS1903 Fixing delivery sensorPS1902 Color toner cartridge releasing lever sensorPS1901C Color toner cartridge sensorSymbolDownload free service manual at http://printer1.blogspot.com