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1)Unhook or unplug the battery box from the radio.
If soldered in one lead is fine. 2) measure volts. If 4.5 V the batteries & holder OK. If not then the problem is the holder or bats. 3) If the voltage drops a lot when you hook up the radio something is loading things down. Look at the output IC or transistors first. The radio may have crapped out then got tossed in a drawer & the bats leaked...... If you like working on small stuff ( I do !) get some DC output wall warts. They used to make them with a voltage switch ( 4.5 - 12 V ), multi connectors & polarity switch. ADD a pair of wires with alligator clips that are color coded & you can sub it in to any low current device without batteries involved. As for bats I only use duracells from a known source to avoid Chi-Com junk & counterfits. 73 Zeno |
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