Sometimes a dry solder joint can prevent the circuit from working or make it stop working intermittently. ![]() Reflow the solder: If you have a soldering iron, you can reflow the solder on the joints on the PCB.Check the voltage on the electromagnet: This should change polarity every second.If you remove some of the gears, the hands of the clock may fall off, so you may need to remove the clear faceplate to replace them.Remove any obvious dust or fluff in the movement.Spray some polish on a tissue or cotton bud and dab it onto shaft ends and teeth and wipe off the excess. I have found that furniture polish helps to clean and lubricate the tips of the shafts of the nylon gears where they sit into the case and cover.Take a photo before disassembling so you can put everything back together. Friction affecting these gears is most likely to stop a clock because further down the gear train, there'll be more torque to overcome it. These should just lift out without any difficulty. Remove the rotor from between the jaws of the solenoid and the first couple of gears.I was able to push into the hairline gap between the compartment and cover with a small screwdriver and prise up the cover. Alternatively there may be pins that push into the cover like in the photo below. If this is the case, push them gently aside with the blade of a screwdriver. There may be lugs on the mechanism compartment that engage with the cover. Check the hands: Make the sure the clock hands aren't rubbing against the clear cover over the face of the clock.Caution! These can snap if you bend too much. Try slightly bending the positive terminal strip in the clock slightly. Check the battery terminals: Sometimes the terminal pips on batteries can be a little short. ![]() If the battery has leaked and left a white deposit (potassium hydroxide from alkaline batteries), you can neutralise this first by rubbing with vinegar. This oxidisation sometimes appears as a grey or green coating. The springy electrical strips can also become oxidised as can the ends of the batteries.
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