electrophotographic process 142 engine control function 43 engine test 140 engine test switch (SW201) 55 error messages printer light patterns 11, 26 ESD (electrostatic discharge) caution 62 mat 63 exit rollers 53 expiration date of toner cartridges 125 F faded print 127 fasteners, common 162 faxes light or dark 126 feed assembly drive rollers 53 feed functions 43 feeding problems 135, 136 fixing process 52 formatter 48 functional checks drum rotation 143 fuser gear motion 147 roller motion 147 fuses 46 fusing assembly 53 element 52 G graphic, bottom cut off 131 190 C4224-90962