Test with a multimeter

7-segment display

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Now: Segment a: red on pin 7

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Pin 1: e (e) Pin 2: d (d) Pin 3: Common cathode (COM) Pin 4: c (c) Pin 5: dp (dot) (dp) Pin 6: b (b) Pin 7: a (a) Pin 8: Common cathode (COM) Pin 9: f (f) Pin 10: g (g)

Red probe Not connectedBlack probe Not connected

Hold the probe and drag it to the tip of a leg. Tapping works too: first pick the probe, then the leg.

Set the range to diode test.

Measure step by step

This guide uses a common-cathode 7-segment display (5161AS): the red probe is on the segment pin, the black probe on the common cathode (pin 3). With a common-anode display you reverse the probes; if you do not know the type, try the diode range first. The matching segment glows faintly while you measure.

  1. 1Segment a: red leg 7
  2. 2Segment b: red leg 6
  3. 3Segment c: red leg 4
  4. 4Segment d: red leg 2
  5. 5Segment e: red leg 1
  6. 6Segment f: red leg 9
  7. 7Segment g: red leg 10
  8. 8Segment dp: red leg 5
  9. 9Common cathode: legs 3 and 8
  10. 10Reverse direction: red on the common cathode