HP 3390 Service Manual - Page 107

Table 4-1 Sequence of operation (continued) Name Timing Purpose PRINT From the end of the INTR period until the primary high-voltage is turned off Forms the image on the photosensitive drum and transfers the toner image to the media LSTR (last rotation) From the end of the PRINT period (when high-voltage is turned off) until the main motor stops rotating Delivers the last page of a print job After LSTR, the all-in-one either returns to STBY or, if another print command was sent from the formatter, enters INTR Table 4-2 Power-on sequence Step 1 2 3 4 5 6 7 8 9 10 Action Power-on CPU initialization Start video interface communication Check sensors for residual media Main motor initial drive Fuser heater initial drive. The fuser heater reaches a surface temperature of 100 degrees C. Laser/scanner motor initial drive High-voltage control Detect presence of a print cartridge Clean the transfer roller after the primary charging ac bias is turned on Failure/abnormality check: detect laser/scanner failure, fuser failure, and open covers Communication with the memory tag ENWW Basic operation 85