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Circuit Descriptions
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443
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LED display
For the display, a 7-segment display for 3 characters was chosen. In addi-
tion, there are four other LEDs for lighting up the buttons and four for dis-
playing the various statuses.
Control of the LED cathodes is via the data bus of Port B and a driver,
ULN2803. The LED anodes are controlled by Port T via the transistors of
type BC817. Control is sequential with a basic frequency of 62 Hz.
The LED "ON" time can be changed via the brightness setting in the service
mode. The LED "ON" time can be adjusted to between 0.1 ms and 1 ms.
Summary of Contents for IES 2
Page 1: ...10 16 80116 443 SERVICE MANUAL IES 2 1 3 x...
Page 2: ......
Page 3: ...SERVICE MANUAL IES 2...
Page 18: ...4 Installation 18 46 80116 443 10 16...
Page 19: ...19 46 5 Circuit Descriptions 80116 443 10 16 CHAPTER 5 Circuit Descriptions...
Page 38: ...8 Maintenance and servicing 38 46 80116 443 10 16...
Page 40: ...9 Replacing components 40 46 80116 443 10 16...
Page 46: ...10 Spare parts 46 46 80116 443 10 16 Fig 10 6 40322 024 1 only 230 V 40322 025 1 40322 013 1...
