6-1-4 Circuit board terminal voltages ................................................................................................ 6-30
(1) Engine board ........................................................................................................................... 6-30
6-1-5 Assignment of circuit board connector pins ............................................................................. 6-36
6-1-6 Print quality problems .............................................................................................................. 6-37
(1) Completely blank printout ........................................................................................................ 6-38
(2) All-black printout ...................................................................................................................... 6-39
(3) Dropouts .................................................................................................................................. 6-40
(4) Black dots ................................................................................................................................ 6-41
(5) Black horizontal streaks........................................................................................................... 6-41
(6) Black vertical streaks ............................................................................................................... 6-42
(7) Unsharpness ........................................................................................................................... 6-43
(8) Gray background ..................................................................................................................... 6-44
(9) Dirt on the top edge or back of the paper ................................................................................ 6-45
(10) Undulated printing at the left edge (scanning start position) ................................................. 6-46
Repetitive defects gauge .............................................................................................................. 6-47
6-1-7 Correcting a paper jam ............................................................................................................ 6-48
(1) Jam in the rear cover............................................................................................................... 6-48
(2) Jam inside the printer .............................................................................................................. 6-49
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