Gestetner B147, Service Manual

Page: 501 / 1081

LASER EXPOSURE
SM 6-43 B147/B149/B190
Detailed
Des
cription
s
6.6.5 LD SAFETY SWITCH
PSU
BCU
LDB (M)
CN401-48 (M)
CN401-49 (M)
E-MAC
LDB (C)
CN401-48 (C)
CN401-49 (C)
E-MAC
CN221-3
CN221-2
CN222-3
CN222-2
CN223-3
CN223-2
CN224-3
CN224-2
CN101-10 LD5V CN350-6
RELAY
CN361-2
Front Door and
Left Door SW
CN361-1
+24V +5V
Right Door SW
LDB (Y)
LDB (K)
CN401-48 (K)
CN401-49 (K)
E-MAC
CN401-48 (Y)
CN401-49 (Y)
E-MAC
B146D923.WMF
B146D526.WMF
[A]
[B]
A relay on the PSU ensures technician
and user safety and prevents the laser
beam from inadvertently switching on
during servicing. This relay turns off
when the front cover, upper left cover, or
right door is opened, and cuts the power
(+5V) supplied to the LD board for each
color through the BCU.
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. Another safety switch
is used for the right door.
•
E-MAC: Enhanced Modulation ASIC
on CMOS
•
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.