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2.3.2 Reset Circuit
Figure 2-16 shows the reset circuit, which is used to reset the controls. immediately after power on and
power off, the +5 VDC line voltage drops and the reset IC (IC9, M51953AFP) outputs the reset signal from
pin 6 (OUT port) into the digital board.
/INIT signals sent thorough the parallel interface by an external device are also input to gate array E02A14
(IC4) (pin 2, /INIT port) to output the reset signal to resetting the scanner.
+5 V
2.3.3 Photo-Sensor Circuit
Figure 2-17 shows the photo-sensors circuit block diagram.
There are two photo-sensors and they have the circuit respectively. Table 2-5 shows two photo sensor
circuit's function, status, and signal levels.
Function
Main
Detects the home position of the carrier
table.
Sub
Detects either the film carrier is installed or
not, and home position of the film carrier.
HP Sensor (Main Scan)
(CN8, pin 1)
HP Sensor (Preview)
(CN4, pin 1)
Figure 2-17. Photo Sensors Circuit Block Diagram
Rev. A
7
IN
OUT
Reset IC
M51953AFP
(IC 9)
Figure 2-16. Reset Circuit Block Diagram
Table 2-5. Photo-Sensor Circuit
6
/RESET
Status and Signal Level
Home: High
Out of home : Low
Carrier insert: High
Carrier home position/No carrier: Low:
23
P93
CPU
HD6413003
(IC8)
34
P47
OPERATING PRINCIPLES
2-13
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