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This is a genuine circuit block electronic module for the Hattori (Seiko Instruments Inc. / TMI) YM62 quartz movement, designed for the YM62 series multi‑function quartz chronograph calibers. As the movement‘s core electronic control unit, the module integrates a quartz oscillator and CMOS integrated circuit, generating a precise 32,768 Hz time base frequency to drive the stepper motor. It controls the precise operation of the central hour/minute hands, central chronograph seconds hand (1/5‑second steps), 60‑minute totalizer at 12:00, small running seconds at 9:00, alarm hour/minute hands at 6:00, and the date window at 3:00.
The module also supports alarm and chronograph functions, making it the core component of a typical mecaquartz movement. As an original OEM replacement part, it provides a direct solution for repairing YM62 movement failures caused by water ingress, battery leakage, or aging electronic components.
Genuine Hattori / SII Part – Japanese factory-original from Seiko Instruments Inc. (SII) / Hattori / TMI / Epson, not a copy, ensuring perfect fit for YM62 movements.
Mecaquartz Hybrid Technology – Combines quartz timekeeping with mechanical chronograph/alarm modules; the central chronograph seconds hand sweeps in 1/5‑second steps, providing mechanical‑like tactile feedback and visual performance.
Full Chronograph Support – Drives central chronograph seconds hand (1/5‑second steps), 60‑minute totalizer at 12:00, and small running seconds at 9:00, with timing capability up to 59 minutes 59 seconds.
Alarm Function – Features independent alarm hour/minute hands at 6:00, settable via the crown and chronograph buttons. When the alarm sounds, a piezoelectric buzzer emits an audible tone for up to 20 seconds; pressing either chrono button silences it.
Calendar Function – Date window at 3:00.
High-Precision Time Base – Integrated 32,768 Hz quartz oscillator with ±20 sec/month accuracy, providing a stable and reliable time reference.
Hacking Seconds – Crown pulls out to stop the seconds hand for precise time setting.
Cost‑Effective Repair – Replaces only the faulty circuit board instead of the entire movement, offering significant cost savings.
| Parameter | Details |
|---|---|
| Part Name | Circuit Block / Electronic Module |
| Compatible Movements | Hattori (SII / TMI / Epson) YM62, YM62A (same platform as Seiko 7T62) |
| Movement Size | 12‴ × 10.5‴ (27.6 mm × 24.1 mm) |
| Movement Thickness | 3.70 – 3.73 mm |
| Overall Height (with hands) | Approx. 6.19 mm |
| Frequency | 32,768 Hz |
| Battery Type | 395 (SR927SW) |
| Battery Life | Approx. 3 years |
| Accuracy | ±20 seconds per month (under -5°C to +50°C) |
| Jewels | 0 |
| Hand Hole Sizes | Hour Ø1.10 mm / Minute Ø0.65 mm / Chrono & small seconds & alarm Ø0.20 mm |
| Functions | Central hour/minute, central chronograph seconds (1/5‑sec steps), 60‑minute totalizer at 12:00, small seconds at 9:00, alarm hour/minute at 6:00, date at 3:00 |
| Hacking Seconds | Yes (seconds hand stops when crown is pulled) |
| Alarm Function | Yes (independent alarm hands + piezoelectric buzzer, silencable) |
| Origin | Japan |
Hattori YM62, YM62A series multi‑function quartz movements (commonly found in Seiko, Lorus, Pulsar, Jacques Lemans multi‑eye chronographs, and many microbrand / custom watches).
Repair of non‑running movements, faulty chronograph functions, non‑sounding alarm, non‑advancing date, or no pulse output after battery replacement.
Particularly suitable for failures caused by water ingress, battery leakage corroding the PCB, or aged electronic components.
Professional watch workshops, brand service centers, DIY watch enthusiasts.
1. Is this a genuine Hattori / Seiko circuit board?
Yes. It is a Japanese factory-original part from Seiko Instruments Inc. (SII) / Hattori / TMI for YM62 series movements, not a third-party copy.
2. What is the relationship between YM62 and Seiko 7T62?
YM62 and Seiko 7T62 are different branding of the same movement platform. 7T62 is the Seiko‑branded version, while YM62 is the OEM version sold under Hattori. Their circuit board modules are identical and fully interchangeable.
3. How can I tell if the circuit board needs replacement?
Symptoms: the movement does not run with a fresh battery; no pulse output detected on a timing machine; chronograph functions are inoperative (non‑mechanical fault); alarm does not sound; date does not advance; visible corrosion on the PCB due to moisture or battery leakage.
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