Polygon Motor Control Circuit - Kyocera KM-1820 Service Manual

(3) Polygon motor control circuit

The main controller PWB supplies the 2598.4 Hz clock pulse (PLGCLK) via the engine PWB 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 PWB
2598.4 Hz
PLGCLK
Engine PWB
Polygon motor control circuit
3
CPU
U1
PLGDR
2
1
Q16
GND
PLGRDYN
R32
3.3V
3
2
Q17
1
Figure 2-3-8 Polygon motor control circuit
+24V3
+5V +
PGND
5
4
3
2
1
YC13
PGND
Laser scanner unit
Polygon motor
25,984 rpm
+24V3
PGND
PLL
PLGDRN
control IC
PLGRDYN
(IC1)
PLGCLK
2GM
2-3-13