Panasonic Panafax UF-490, Service Manual

Page: 135 / 162

135
Laser Unit (LSU) Error Detection
Motor ON
Polygon Motor does not
reach constant speed
during wake up state.
Polygon Motor ON
Polygon Motor Ready
nSTART nREADY:ON
Normal Condition
OFF OFF OFF OFF
Normal Condition
5 sec
1.23 ms (600 x 600dpi) 1.89 ms (16 x15.4 line/mm)
20 sec
nSTART
(CN10, 3)
nREADY
(CN10, 2)
E054
nREADY
Polygon Motor does not
maintain constant speed.
Laser Timing Signal
E054
nREADY
nVIDEO
(CN10, 8)
Laser Timing Detection
nHSYNC
(CN10, 13)
nREADY does not go low for more than 2 sec during 3 sec to
20 sec after nSTART goes low.
nREADY goes high 4 times during printing.
Can not detect
Laser Timing
E054
nHSYNC
(CN10, 13)
nHSYNC timing signal is less than 60% of Normal Condition
Laser Enable Signal
nLDEN
(CN10, 9)