Toshiba e-STUDIO4500c Service Manual page 409

April, 2007
SC220 D Laser Synchronization Detector Error 1: K Leading Edge: LD0
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for LD0 black, or leading
edge, even after the laser diode
has been firing for 2 sec.
SC221 D Laser Synchronization Detector Error 2: K Leading Edge (Other than LD0)
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for black, leading edge for
any LD other than LD0, even
after the laser diode has been
firing for 2 sec.
SC222 D Laser Synchronization Detector Error 1: Y Leading Edge: LD0
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for LD0 yellow, leading
edge, even after the laser diode
has been firing for 2 sec.
SC223 D Laser Synchronization Detector Error 2: Y Leading Edge (Other than LD0)
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for yellow, leading
edgefor any LD other than LD0,
even after the laser diode has
been firing for 2 sec.
SERVICE CALL CONDITIONS
Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
Laser synchronizing detector defective
Beam not reflected in photo detection
GAVD (ASIC) on the BICU is defective
LD driver board defective
LDB defective
BICU defective
Check board connections, replace
Beam not reflected in photo detection
GAVD (ASIC) (ASIC) on the BICU
defective
LD driver defective
LDB defective
BICU defective
Check board connections, replace
Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
Laser synchronizing detector defective
Beam not reflected in photo detection
GAVD (ASIC) (ASIC) on the BICU
defective
LD driver board defective
LDB defective
BICU defective
Check board connections, replace
Beam not reflected in photo detection
GAVD (ASIC) (ASIC) on the BICU
defective
LD driver defective
LDB defective
BICU defective
Check board connections, replace
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