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(3) Polygon motor control circuit
The main controller board supplies the 2598.4 Hz clock pulse (PLGCLK) via the engine board to the PLL control IC (IC1) for
the polygon motor. To begin printing, the engine CPU U1 turns PLGDR to H level, the PLL control IC (IC1) starts to revolve
the polygon motor so that the revolution is 25,984 rpm which depends on the PLGCLK clock pulse. When PLL control IC
(IC1) finds that the polygon motor is revolving at the rated speed, turns PLGDRN to L level to acknowledge the engine CPU
that the rated speed has been achieved.
On the contrary, if PLGRDYN does not turn to L level within 8 seconds since PLGDRN has been L level.
Main board
PLGCLK
Polygon motor control circuit
CPU
U1
PLGDR
2
Q18
PLGRDYN
3.3V
3
2598.4 Hz
2
1
Figure 2-3-6 Polygon motor control circuit
Engine board
3
+5V
1
GND
R32
Q17
+24V3
+
PGND
+24V3
5
PGND
4
PLGDRN
3
PLGRDYN
2
PLGCLK
1
YC13
PGND
2DC
Laser scanner unit
Polygon motor
25,984 rpm
PLL
control IC
(IC1)
2-3-7
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