Laser Emission Timing - Konica Minolta BizHub C360 Service Manual

Theory of Operation Ver. 1.0 Jul. 2009
9.2.3

Laser emission timing

• After a print cycle has been started, when the stable rotation signals of photo conductor
and polygon motor are detected, a laser ON signal is output from the printer control
board.
• The laser ON signal causes each laser diode to turn ON and emit a laser beam.
• After passing through the return mirror (light source), cylindrical lens, polygon mirror, G1
lens, G2 lens, index mirror, and index lens, the K laser light is applied to the index board.
This generates an index signal.
• This index signal has a function of keeping the same laser light emission timing per every
one line in the main scanning direction.
• The index signal is generated with the K laser light only. The laser light emission timing
for other colors is determined with reference to K.
• If the index signal is not detected within a predetermined period of time, the machine
determines that it is a laser emission fault, displaying "trouble code: C4501 laser mal-
function".
• The machine continuously monitors the index signal. If the index signal cannot be
detected at regular intervals, the machine determines that it is a laser emission fault, dis-
playing "trouble code: C4501 laser malfunction".
Laser drive board/M
(LASDB/M)
Laser drive board/Y
(LASDB/Y)
Laser drive board/K
(LASDB/K)
Polygon mirror
G1 lens
Laser drive board/C Index board (INDEXB)
(LASDB/C)
9. WRITE SECTION (PH SECTION)
Index lens
Index mirror
G2 lens
A0EDT2C170DA
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