HTTP://BBS.FIXCLUB.COM.CN
20
DP-1510P/1810P
/1810F/2010E
JUL 2002
Edition 1.0
1.1.10.
Laser Printer Motor Drive Circuit
1. System Description
It consists of 16 bit CPU M30802. The CPU controls mechanism of Laser Printer, Fuser Lamp
temperature, and Laser Unit.
2. Reset Circuit
This circuit consists of IC301 (PST575E) and peripheral circuit. This circuit always watches 5V. Output
of this circuit (nRST) is set that if 5V falls below setting level (3.9V). When the 5V rises above voltage,
the reset signal is canceled after a delay of approximately 20 ms. After cancelling, software is started
by CPU.
IC2
PST575E
R26
Q1
C20
R24
R3
C1
1
2
3
4
IC1
CPU
pLPRST
Reset Circuit
Vdd
5V
3.9V
td
td
td=20ms
Reset Signal Timing Chart