When a quartz watch stops keeping time, the first assumption is the
battery has to be replaced. That assumption is correct in most cases – very little else interferes with the accuracy and dependability of a quartz watch.
Quartz watches consist of a quartz oscillating crystal, an electronic circuit to drive the watch, a means of displaying time and a
battery to power the whole system.
The
battery generally rests in a well or “nest.” The negative
battery contact strap lies on the bottom of the well. The positive contact strap is attached to the side. In some models the hold-down strap itself acts as the positive contact.
In either case, the negative and positive straps must be clear of any residue or contaminant. Wipe the straps with a clean piece of sharpened peg wood. If a stubborn residue remains, use a sharpened typewriter eraser.
If the
battery is held with a strap and screw, loosen the screw carefully so the screwdriver doesn't slip out of the slot and damage the movement. Choose a sharp screwdriver the width of the screw diameter.
A
battery may be held in position with a side-mounted spring tension contact instead of a strap. In this case, bite into the side of the
battery with a small screwdriver blade and lift up. Be careful not to push the side-mounted positive contact down into the
battery well – the watch won't work if the positive (+) contact doesn't touch the edge or side of the
battery.
Replace with Care
Handle the
battery with a pair of
plastic tweezers (forceps). Oil and salt from your fingers can corrode the watch. If you can't completely insert the
battery with
tweezers, use a piece of Rodico or rubber finger cots on your fingertips to protect the
battery. Long finger nails are good for pushing the
battery into place.
Don't touch any part of the watch movement except the
battery, its straps and its screws. And touch these only with
tweezers – plastic for the
battery and thin metal tweezers for the screws and retainer strap.
Digital Quartz Watches
In many quartz watches (mainly digital or a combination of analog and digital displays), you must clean the electronic circuit after changing the
battery. This provision is called an AC or “all clear” circuit. It's typically a small silver or goldcolored dot marked AC on the back of the movement. To clear the circuit, place one point of metal tweezers on the dot and the other on the positive side of the
battery. On some models, push a spring tab onto the AC dot with a
tweezer tip or probe.
In either case, the watch display will display 12:00 and begin to run. Depress the mode button to begin the resetting procedure.
Be Clean
Cleanliness is the primary concern when changing the
battery in a quartz analog watch. These watches use tiny motors that pulse or rotate once per second, causing the second hand to jump forward one second at a time. However, the gears are driven by such low power the slightest amount of dirt, lint or dried lubricant will stop the moving parts.
Be vigilant when removing dirt from the case back when opening the watch to change the
battery. This is also the reason gaskets in the case back and crown must be replaced periodically in quartz watches.
