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Part 2: Repair Information
2-2
2. CIRCUIT PROTECTIONS
This projector provides the following circuit protections to operate in safety. If the
abnormality occurs inside the projector, it will automatically turn off by operating one of
the following protection circuits.
2.1 Fuse
A fuse is located inside of the projector. When the
POWER indicator is not lightning, the fuse may be
opened. Check the fuse as following steps.
The fuse should be used with the following type;
[Fuse replacing steps]
1. Remove the cabinet top and cabinet front following
to “Mechanical Disassemblies”.
2. Replace the new one with the specified type.
2.2 Thermal Switch
There is the thermal switch (SW902) inside of the
projector to detect the internal temperature rising
abnormally. When the internal temperature reaches
near 90˚C, it cuts off the AC main power supply.
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. Insert the sharp tool like a screwdriver into a hole
on the cabinet bottom.
2. Press the reset button on the thermal switch 11
with the screwdriver.
2.3 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.
Fuse Part No. DY4-5918-000
TYPE T6.3AH 250V FUSE
LITTLE FUSE INC. TYPE 21506.3
Before press the reset button,
make sure that the AC cord
must be disconnected from the
AC outlet.
CAUTION
Fig. 2-1
Fig. 2-2
Fig. 2-3
Fuse
Thermal switch (SW902)
Lamp cover switch
Summary of Contents for D78-5532
Page 2: ...CANON Multimedia Projector LV X4U D78 5532 LV X4E D78 5533 SERVICE SMANUAL ...
Page 9: ...Part 1 General Information ...
Page 26: ...Part 2 Repair Information ...
Page 43: ...Part 3 Adjustment ...
Page 62: ...Part 4 Troubleshooting ...
Page 79: ...Part 4 Troubleshooting 4 17 AN5870SB RGB SYNC SW IC5201 LM4889 Audio Amplifier IC5031 ...
Page 81: ...Part 4 Troubleshooting 4 19 FA5502 P F Control IC621 VPC3230D Video Decoder IC101 ...
Page 84: ...Part 4 Troubleshooting 4 22 TA1370FG Sync Separator Frequency Counter IC5302 ...
Page 85: ...Part 5 Parts Catalog ...
Page 86: ......
Page 94: ......
Page 100: ...Part 6 Electrical Diagrams ...