tests engine 140 half-self 142 text, scanned, unclear 133 timing diagram 59 toner draft mode for conserving 49 scattered on page 130 toner cartridge 38 recycling 38 refilled 38 toner cartridges checking 125 checking and cleaning connection points 146 description 51 expiration date 125 photosensitive drum 125 sensor 55 weight when full and empty 125 tools servicing 63 troubleshooting 147 transfer process 142 transfer roller motion 147 trays documents fall out 136 troubleshooting drum rotation 143 image formation 125 paper feed problems 134 printer light patterns 11, 26 process malfunctions 142 C4224-90962 197