A chronograph that runs fast or slow is usually either a timekeeping problem in the movement or a stopwatch hand that is sitting off its zero position. The two look similar from across the room but have different causes and different fixes, so separate them before you change anything. In a mechanical chronograph, the most common causes of a real rate problem are magnetism, temperature extremes, shock, irregular winding, and an overdue service. Basic checks can narrow the cause, but confirming it and correcting it usually requires an authorized service center.
Start by separating a timekeeping fault from a stopwatch-hand fault
The main hour, minute, and seconds display and the chronograph counters run on different parts of the same movement. A problem in one does not automatically mean the other is affected. Use the symptoms below to decide which question you are answering.
| What you see | What it usually points to | First response |
|---|---|---|
| The main time display gains or loses steadily against a reliable reference | A rate problem in the movement | Confirm the expected accuracy in the manual, then run the basic checks below |
| A chronograph hand does not return to zero after a reset | Hand alignment, which is a separate issue from the time-keeping rate | Check whether your model lists a preliminary-position adjustment; do not force the hand |
| Hands stop, jump, or reset erratically after a knock | Possible physical damage | Stop testing and arrange professional inspection |
| The rate changed after the watch sat near a strong magnet | Possible magnetization | Move the watch away from the source, then check whether the rate recovers |
A stopwatch hand that does not reset to zero does not, by itself, prove that the main display is losing time. Treat it as a chronograph alignment symptom and test the timekeeping separately.
Know your movement and its accuracy standard
Chronographs use several movement types. A hand-wound or automatic mechanical chronograph, a quartz chronograph, and other designs each have different expected behavior, and no single seconds-per-day figure fits all of them. Before judging your watch, find the manual for your exact model and note:
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- The movement type (mechanical, automatic, quartz, or other) and the caliber number if the manual lists one
- The maker’s stated accuracy tolerance for that model
- The winding instructions, if the watch is mechanical
- Whether the manual describes a preliminary-position adjustment for the chronograph hands
Seiko’s support and manual pages describe Seiko models only, and the pages reviewed do not show publication dates. Read their figures as guidance for the models named on those pages. Other brands publish their own tolerances and service routes, and those should replace any Seiko figure here.
Safe first checks
These steps require no tools beyond a reliable time reference and a notebook. They do not involve opening the case.
- Identify the movement and locate the manual for your exact model. Look up the stated accuracy tolerance before comparing anything.
- Measure the main display against a reliable reference over a fixed interval you can repeat. Note the time shown, the reference time, and the date at the start and end. A single reading tells you little.
- Test the chronograph hands separately. Start, stop, and reset the chronograph, then check whether the hands return to the zero position. If they do not, record the offset and stop there for the moment.
- For a mechanical watch, confirm it is wound as the manual directs. A watch that has been left unwound will not keep its normal rate.
- Review recent exposure. Consider strong magnetic sources, temperature extremes, drops, knocks, and heavy vibration. Move the watch away from magnetic sources and return it to normal wear conditions.
- Log the result and repeat the measurement under the same conditions. Do not open the case, and do not attempt internal adjustment as a troubleshooting step.
What causes the rate to drift
Winding and wear pattern in mechanical watches
In a mechanical watch, the state of the mainspring, regular use, arm movement, and the position in which the watch rests can all affect its rate. Seiko’s mechanical accuracy FAQ recommends winding the mainspring every day at a fixed time, even on self-winding models, and describes regular winding as a way to improve accuracy. The same FAQ recommends wearing a mechanical watch for more than 8 hours a day. That is a recommendation for stable running, not a universal requirement.
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If your rate varies, keep a short log of when you wound the watch, how many hours you wore it, and where it rested overnight. Do not conclude that the movement is faulty from one reading.
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Magnetism can make a mechanical watch gain or lose time, and the effect does not end when the watch leaves the magnetic source. Seiko’s support FAQ states: “A mechanical watch affected by magnetism remains magnetized even after removing it from the magnetic source.” Moving the watch away is necessary, but it does not restore accuracy by itself. If the rate still does not recover, Seiko recommends professional demagnetization. Seiko’s 6R35 instructions put it more bluntly: “Accuracy cannot be recovered. Restoring the original accuracy requires demagnetization (repair).” The maker guidance reviewed does not describe a home demagnetizing procedure, so do not assume one is safe for your watch.
Temperature
Mechanical parts respond to temperature. Seiko’s 6R35 instructions say that watch is adjusted to run accurately when worn within 5°C to 35°C, and list prolonged temperature extremes among the causes of inaccuracy. This range is guidance for that model. It is not a universal limit for chronographs. If you suspect temperature, return the watch to normal wear conditions and measure again under the same conditions as before.
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Shock and vibration
Drops, hard impacts, active sports, and strong vibration can all affect accuracy and can also misalign the chronograph hands. If the change began right after an impact, do not keep testing the watch to see whether it settles. A struck watch should go to inspection.
An overdue overhaul
For the 6R35 movement, Seiko’s troubleshooting table advises consulting the retailer if accuracy does not return after resetting, and advises the same if the watch has not been overhauled for more than three years. That interval comes from that manual and should not be generalized to every watch. Check the service schedule for your own model.
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Basic checks are the right starting point, but they have limits. Move to authorized service in any of these cases:
- The rate stays outside the maker’s stated tolerance after you have repeated the measurement under consistent conditions.
- The watch has been dropped or hit hard, or its timekeeping changed after an impact.
- Magnetization is suspected and the rate does not recover after you move the watch away from the source.
- Accuracy does not return after a reset, which the 6R35 troubleshooting table asks owners to take to the retailer.
- The watch is overdue for overhaul by the maker’s own schedule.
For Seiko watches, Seiko’s support FAQ states: “If you have any concerns about the accuracy of your watch, we recommend that you contact an Authorized Seiko Service Center or a Seiko appointed dealer to have the watch inspected.” For watches from other makers, use that maker’s authorized service network. Bring your log of readings, the exposure events you recorded, and the model’s manual so the technician can start from your data rather than repeating the basic checks.
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