Sharp XG-PH70X Service Manual page 42

XG-PH70X/XG-PH70X-N (1st. Edition)
4. Disabling of the sensors
CAUTION: When the unit is returned to a user with the sensors disabled, the cabinet may be deformed by heat because the protection function does
not work. After completion of inspection, be sure to restore the sensors to their original state.
• Temperature sensor
Mount a resistor of 10 k_ between pins 1 and 2 of CN7205 and a resistor of 12 kΩ between pins 1 and 2 of CN7005 to turn on the power with the
sensor detached. Since the unit is set to the sensor temperature fixed mode, the fan speed is fixed to low speed. After completion of inspection, be
sure to remove the resistors.
• Fan lock detection
This unit detects the pulse of the fan. When checking the operation of the PWBs without running the fan, connect the pin C8 of IC3603 (on the pin
C8 side of R3727) to GND with a jumper wire. Even if the fan does not run, the unit continues operation. Therefore the reliability of parts cannot be
maintained. After completion of inspection, be sure to remove the jumper wire.
• Air filter cover detection
Short-circuit between pins 1 and 2 of CN7001.
Since the power turns on even if the filter cover is removed, the user may be injured with the fan. After completion of inspection, be sure to restore
it to its original state.
• Lamp cartridge detection
This unit has two lamps. When turning on the lamp with one lamp cartridge removed, the cabinet may be deformed by heat. After completion of
inspection, be sure to restore the lamp cartridge to its original state.
Short-circuit between pins 1 and 2 of CN2801/CN2802.
• Color wheel motor/Photosensor
Cannot be disabled. Connect an extension jig.
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