NEC MultiSync LCD1970NX Service Manual page 65

CIRCUIT DESCRIPTION
TABLE OF CONTENTS
1. Block Diagram ........................................................................................................................ 7-2
2. Power Circuit .......................................................................................................................... 7-3
2.1 Power Input ....................................................................................................................... 7-3
2.2 DC to DC Circuit................................................................................................................ 7-3
2.3 Panel Vcc Control ............................................................................................................. 7-3
3. Microprocessor Control Circuit ............................................................................................... 7-3
3.1 Clock Circuit ...................................................................................................................... 7-3
2
3.2 I C Buses .......................................................................................................................... 7-3
3.3 General-purpose Port........................................................................................................ 7-3
3.3.1 Key Scan Status ......................................................................................................... 7-3
3.3.2 Scalar Control............................................................................................................. 7-4
3.3.3 Led Control ................................................................................................................. 7-4
3.3.4 Data Memory .............................................................................................................. 7-4
4. Scalar...................................................................................................................................... 7-4
7-1
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