Fuser front paper sensor (PS6) removal ........................................................................256 Fuser delivery paper sensor (PS7) removal ...................................................................256 Face-down delivery paper sensor (PS8) removal ..........................................................257 Reversed paper sensor (PS9) removal (HP 3700 only) .................................................257 Duplex feed delivery paper sensor (PS10) removal (HP 3700 only) .............................258 Rear output bin paper sensor (PS11) removal ...............................................................259 Color misregistration sensor (PS12) removal ................................................................260 Waste toner level sensor (PS13) removal ......................................................................260 Developing engaging sensor (PS14) removal ................................................................261 Environment sensor (PS15) removal .............................................................................261 Secondary transfer roller engaging sensor (PS16) removal ..........................................262 Solenoids and Clutches ........................................................................................................263 Tray 1 (multipurpose tray) pick-up solenoid (SL1) removal ...........................................263 Tray 2 pick-up solenoid (SL2) removal ...........................................................................264 Secondary transfer roller engaging solenoid (SL4) removal ..........................................265 Duplex feed solenoid (SL5) removal (HP 3700 only) .....................................................266 Registration clutch (CL1) removal ..................................................................................266 Black (K) development clutch (CL2 - image drive) removal ...........................................267 Developing engaging drive clutch (CL3) removal ..........................................................268 Motor and fans ......................................................................................................................269 Feed motor (M1) removal ...............................................................................................269 Delivery motor (M2) removal ..........................................................................................271 Drum motor (M3) removal ..............................................................................................271 Developing motor (M4) removal .....................................................................................273 Primary transfer roller engaging motor (M5) removal ....................................................274 Exhaust fan (FAN1) removal ..........................................................................................277 Circuit Boards ........................................................................................................................278 DC controller PCB removal ............................................................................................278 Formatter PCB removal ..................................................................................................279 High-voltage power supply PCB removal .......................................................................281 Low-voltage power supply PCB removal .......................................................................285 Memory controller PCB removal ....................................................................................286 Control Panel PCB removal ............................................................................................287 Miscellaneous parts ..............................................................................................................288 Swing rod guide, left removal .........................................................................................288 Swing rod/lock guide, right removal ...............................................................................288 Transfer contact assembly removal ...............................................................................288 Developing contact assembly .........................................................................................288 Tray 2 (cassette) parts removal ............................................................................................291 Tray 2 (cassette) .............................................................................................................291 Cassette (Tray 2) guide, right, removal ..........................................................................291 500-Sheet paper feeder (Tray 3) covers ...............................................................................296 Front cover removal - 500-sheet paper feeder ...............................................................296 Right cover removal - 500-sheet paper feeder ...............................................................297 Left cover removal - 500-sheet paper feeder .................................................................297 500-Sheet paper feeder internal parts ..................................................................................298 Pick-up roller removal - 500-sheet paper feeder ............................................................298 Separation pad removal - 500-sheet paper feeder ........................................................299 Pick-up drive unit removal - 500-sheet paper feeder .....................................................299 500-Sheet paper feeder sensor/solenoid/motor/PCB ...........................................................300 500-Sheet paper feeder PCB removal - 500-sheet feeder ............................................300 Pick-up clutch (CL4) removal - 500-sheet feeder ...........................................................301 Pick-up solenoid (SL3) removal - 500-sheet feeder .......................................................301 Paper sensor (PS3) removal - 500-sheet feeder ...........................................................302 ENWW Conventions ix