-5-
Lamp cover switch
The lamp cover switch (SW901) cuts off the drive signal to the lamp
circuit when the lamp cover is removed or not closed completely.
After opening the lamp cover for replacing the lamp ass’y, place the
lamp cover correctly otherwise the projector can not turn on.
thermal switch
There is the thermal switch (SW90) inside of the projector to de-
tect the internal temperature rising abnormally. When the internal
temperature reaches near 105˚C, the thermal switch opens to stop
the operation of the power supply circuit.
The thermal switch cannot be reset itself automatically even if the
internal temperature becomes normal. Reset the thermal switch
following to the below procedure.
How to reset the thermal switch
1. Remove the cabinet top, cabinet front and main board and then
remove the power box top cover.
. Press the reset button on the thermal switch in the power box.
cAutIoN:
Before press the reset button, make sure that the AC cord must
be disconnected from the AC outlet.
This projector provides the following circuit protections to operate in safety. If the abnormality occurs inside the pro-
jector, it will automatically turn off by operating one of the following protection circuits.
circuit Protections
SW901
Thermal switch (SW90)
Summary of Contents for PRM-20
Page 68: ... 68 IC Block Diagrams MP2106 DC DC Converter IC5821 IC5861 FA5502 P F Control IC621 ...
Page 71: ... 71 IC Block Diagrams LM4889 Audio Output IC5031 NJW1156 Audio Control IC5001 ...
Page 74: ... 74 LAN9118 LAN Driver IC8801 IC Block Diagrams MC9328MX21 System Control of Network IC8301 ...
Page 103: ...KM5 2000 KM5 20 S 00 103 ...
Page 104: ... KM5YC KM5ZC January 2009 DC 200 Printed in Japan ...
Page 116: ...A10 SCH_KM5YC SCH_KM5ZC NO DATA ...