Sony UP-960, Руководство по обслуживанию

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4-11 UP-960(UC)
UP-960CE(CE)
4-4-6. Watch of Paper Sensor
Whether the print paper is set in the unit correctly or not, it is detected by three pairs of optical type paper sensors (SE-485
board PH502, PTC-98 board PH301) and read by IC505 pins 81 and 83.
Condition of Paper Sensor (— : L or H)
IC505-83pin IC505-81pin Condition
L L There is a paper.
L H No paper
H L No paper
H H No paper
4-4-7. Watch of the Head Temperature Sensor
The resistor value change of thermistor included in the thermal head is converted to the voltage by IC404. The result is
fetched to IC505 pin 78 and is converted A/D. Cause of this A/D converted digital value, the density (Gamma) adjustment,
fan motor control for head cooling and head in cooling judge by IC601 (Gate array) are performed.
4-4-8. Head Fan Motor (for Head Cooling) Control
Head fan motor is operated by controlling the driving transistor Q409 using IC505 pin 2. When the head temperature is
over heat or during print mode, head fan motor is turned ON.
Operation of Head Fan Motor
IC505-2pin Operation
L OFF
H ON