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Often times when power issues are present, simply make sure that all the batteries are making contact with eachother and, if applicable, the battery adapter and both positive and negative terminals in the battery tube.

Check the voltage across the corresponding pins of the DB-25 Connector. For the recommended batteries, this should be around 9V. Check the battery + and - wires. Orange/Black-Orange and Light Green/Black-Light Green. A small piece of wire can help make a good connection with the multimeter.

Also, you can check each individual battery to make sure that it has the correct voltage.

Make sure to move the wires around or shake the battery tubes to identify any discontinuity.

You can remove the plastic wrapping on the bottoms of the batteries as shown to assist in good contact.