Service manual

LASER EXPOSURE
SM 6-23 G130/G131
Detailed
Descriptions
6.3.4 LD SAFETY SWITCH
Two safety switches are used to turn the relay off. One switch is used for the front
cover and upper left cover. This safety switch is off when either of the two covers is
opened. The other safety switch is used for the right door.
• PMAC: Precise Pulse Modulation ASIC on
C-MOS technology
• LDB: LD Drive Board (included in the LD Unit)
Front and Upper Left Cover Switch
The micro switch [A] on the PSU is activated or
deactivated by the actuator [B] when the front
cover or the upper left cover is opened and closed.
PMACA
PD
LD
5V
3.3V 1.8V
3.3V 1.8V
3.3V 1.8V
3.3V 1.8V
LDB(M)
LD5V
LD5V
3.3V
CPU
(H8)
3.3V
5V
REG
1.8V
BCU
LD5V
5V
Polygon
Motor
GND
24V
RELAY
5V
5V
24V
24V
Front Cover
and Upper
Left Cover
SW
Right Cover
SW
24V
L
D
P
D
PMACA
PD
LD
5V
LDB(C)
L
D
P
D
PMACA
PD
LD
5V
LDB(Y)
L
D
P
D
LDB(K)
GAVD
LDOFF
LDOFF
LD5V
LD5
V
LD5V
LDOFF
GAVD
GAVD
GAVD
REG
3.3V
1.8V
GAPCI
3.3V
PSU
24VS
PMACA
PD
LD
5V
L
D
P
D
LDOFF
GND
G130D901.WMF
G130D520.WMF
A relay on the PSU ensures
technician and user safety. It
also prevents the laser
beam from turning on during
servicing. This relay turns of
f
when the front cover, upper
left cover, or right door is
opened. At this time, it cuts
the power (+5V) supplied to
the LD board for each color
through the BCU.
[A]
[B]