Samsung ML-3471ND/XAX Service Manual page 19

Product specification and feature
2.2.1.2(e) LSU
LSU is consist of LD(Laser Diode) and polygon motor control. When the controller generate the printing signal LD will
turn on and Polygon motor starts.If the receiving part in LSU detect the beam and then Hsync is generated. When the
rotation of poygon motor is steady, it is time of LSU ready status for printing. If either of two condition is not satisfied,
LSU error is expected.
Trouble
Polygon Motor Error
Hsync Error
2.2.1.2(f) Toner Cartridge
OPC Cleaning :Mechanical Cleaning by the cleaning blade.
The recycled toner : Trash room for the recycled toner
No shutter for protecting the OPC Drum
Cleaning Roller
2
-1.25KV
1
Cleaning Blade
8
Service Manual
2-10
Failure Analysis
No steady rotation of Polygon Motor
In spite of steady rotation of Polygon Motor,
There is no generation of the Hsync signal
0.16mW V = -460V
DC
V = 1520V, f = 2.5KHz, Duty(-) = 32%
PP
-650V
-50V
6
7
4
-
+
200V
3
5
+4.2kV
Samsung Electronics