6-1-4 Circuit board terminal voltages ................................................................................................ 6-28
(1) Engine board ........................................................................................................................... 6-28
6-1-5 Assignment of circuit board connector pins ............................................................................. 6-34
6-1-6 Print quality problems .............................................................................................................. 6-35
(1) Completely blank printout ........................................................................................................ 6-36
(2) All-black printout ...................................................................................................................... 6-37
(3) Dropouts .................................................................................................................................. 6-38
(4) Black dots ................................................................................................................................ 6-39
(5) Black horizontal streaks........................................................................................................... 6-39
(6) Black vertical streaks ............................................................................................................... 6-40
(7) Unsharpness ........................................................................................................................... 6-41
(8) Gray background ..................................................................................................................... 6-42
(9) Dirt on the top edge or back of the paper ................................................................................ 6-43
(10) Undulated printing at the left edge (scanning start position) ................................................. 6-44
Repetitive defects gauge............................................................................................................... 6-45
6-1-7 Correcting a paper jam ............................................................................................................ 6-46
(1) Jam in the rear cover ............................................................................................................... 6-46
(2) Jam inside the printer .............................................................................................................. 6-47
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