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MSI Logic Circuits

Q1: There appears to be a problem with a 7-segment display on a DMM sometimes skipping certain numbers. How would you test the display?

A Remove the display unit and check each segment diode with an ohmmeter. Replace the defective segments.

B Apply 5 V directly to each segment of the display and check for individual segment operation. Replace any segment that has voltage applied but is not lit.

C Tie all of the segments together and connect to Vcc; the number 8 should appear on the display. Now check the display supply voltage to determine if the display is receiving the correct voltage.

D Connect the DMM to a variable supply and very slowly increase the voltage, while observing for missing digits. Then check the segment voltage to determine whether the display or the display driver is bad.

ANS:D - Connect the DMM to a variable supply and very slowly increase the voltage, while observing for missing digits. Then check the segment voltage to determine whether the display or the display driver is bad.

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