Quartz mechanism in wristwatches: design, malfunctions and repairs

Quartz watches are the most common type of wristwatch due to their accuracy, reliability and affordable price. Unlike mechanical ones, where the movement of the arrow is ensured by a spring and a system of gears, a quartz mechanism works based on vibrations of a quartz crystal under the influence of electric current. This principle allows you to achieve an error of no more than ±15 seconds per month - 10 times more accurate than classical mechanical models.

However, even quartz watches do not last forever: over time, the battery runs out, seals wear out, and electronic components fail. In this article, we will look at how the quartz movement works, what its weak points are, how to diagnose breakdowns, and whether it is possible to repair the watch yourself. Let us separately focus on choosing a new watch, taking into account the type of mechanism - this will help to avoid common mistakes when purchasing.

How a quartz movement works: physics and design

The basis of the quartz movement is quartz resonator - a small crystal that, when exposed to an electric current, begins to vibrate at a fixed frequency (usually 32,768 vibrations per second). These vibrations are converted into electrical impulses that drive a stepper motor. The latter, in turn, turns the gears and moves the arrows.

Key components of a quartz movement:

• 🔋 Power supply - battery (usually SR626SW, SR920SW or LR44), less commonly a solar panel or a kinetic generator.
• 🔮 Quartz resonator - the “heart” of the mechanism, which sets the oscillation frequency.
• ⚙️ Electronic circuit — divides the resonator frequency to 1 pulse per second.
• 🔄 Stepper motor - converts impulses into mechanical movement.
• ⏱️ Gearbox - a system of gears that transmits movement to the hands.

Interestingly, the frequency of 32,768 Hz was not chosen by chance: it is a power of two (2¹⁵), which makes it easier for the electronic circuit to divide the signal down to 1 Hz (1 pulse per second). This solution allows you to minimize energy consumption and increase battery life to 2–5 years.

⚠️ Attention: If your quartz watch starts to rush or lag more than 1-2 minutes per month, this may indicate resonator malfunction or contamination of the mechanism. Unlike mechanical watches, where the error can be corrected by adjusting the balance, a quartz movement requires replacement of parts.

Types of quartz movements: how they differ

Not all quartz watches are created equal. They can be divided into several categories depending on the power source and additional functions:

Solar and kinetic mechanisms are considered more reliable in the long term, as they eliminate the need for regular battery replacement. However, their repair is more expensive due to the complexity of the design. For example, replacing a battery in Citizen Eco-Drive can cost up to 30–50% of the price of a new watch.

Typical malfunctions of quartz watches and their causes

Quartz watches break less often than mechanical watches, but they also have weak points. Here are the most common problems:

• ⏳ The clock has stopped — the battery is dead, the contacts are oxidized, or the stepper motor is broken.
• ⏪ The arrows move jerkily — contamination of the mechanism, wear of gears or malfunction of the electronic board.
• ⏱️ Imprecise stroke (±1 minute per day) — damage to the quartz resonator or defect in the electronic circuit.
• 💧 Glass fogging — depressurization of the housing, wear of the sealing rings.
• 🔊 A squeaking or crackling sound is heard — moisture on electronic components or mechanical damage.

Critical fault: If after replacing the battery the watch does not start and the hands do not respond to external influences (for example, gentle shaking), this may indicate a short circuit in the electronic circuit. In 80% of cases, such a defect requires a complete replacement of the mechanism.

One of the most insidious breakdowns - microcracks on a quartz resonator. They occur due to shocks or temperature changes and lead to unstable running. This problem can only be diagnosed using special equipment (for example, timegrapher for quartz movements).

Diagnostics of a quartz movement: what you can do yourself

Before taking your watch to the workshop, you can carry out preliminary diagnostics at home. Here is a step-by-step algorithm:

1. Check the battery:
   • If the watch has stopped completely, carefully remove the battery (using a screwdriver with a plastic tip) and check its voltage with a multimeter. Norm for SR626SW — 1.55 V. If the voltage is below 1.3 V, the battery needs to be replaced.
   • Pay attention to the contacts: oxidation or corrosion may block the current. Clean them with alcohol and a soft brush.
2. Leak test:
   • Blow on the watch glass. If it fogs up after 10-15 seconds, the seals have lost their seal. This is critical for waterproof models (for example, Casio G-Shock).

1. Remove the battery.
2. Press the time corrector button (if available) and hold for 10 seconds.
3. Insert a new battery.
4. Lightly shake the watch - the hands should move.

1. Disassemble the case (if you have experience).
2. Place the mechanism in alcohol for 10–15 minutes.
3. Dry with compressed air (not a hairdryer!).
4. Lubricate the rubbing parts with a minimum amount of watch oil (Moebius 9010).