Di Board (713-5000) - Hitachi 902 Service Manual

10.6 DI Board
(1) Explanation of Circuit Board
This circuit board is a buffer board for waveform shaping of input signals of sensors
(photo-interrupter, water level sensor, etc.) and has the following functions.
• Reset circuit (SYSRESET/ACFAIL signal supply to VME bus)
• Generation of ADC timing signal for photometry hardware trigger
• DC voltage monitoring (±15 V, 12 V)
• Generation of ±15 V voltage for analog use (DC-DC converter)
(2) External View
LED
5 V
12 V
+15
V
-15 V
VR1
(for adjustment
of ADC timing)
VR1
(for confirmation
of ADC start signal)
(233.35)
Reset circuit
(160)
10 - 24
DC-DC
converter