Seiko 5J22A - User Manual

The Seiko Cal. 5J22A is an epoch-making model of Seiko's revolutionary Kinetic watches, equipped with innovative functions that introduce a new concept into Kinetic technology. This guide provides comprehensive information for repairing and checking the watch securely.

Function Description

The Cal. 5J22A features a unique power save function that automatically stops the hands if the watch is left untouched for a certain period. This conserves stored electrical energy and eliminates the need for cumbersome time setting when the watch is used again. When the watch is swung, the time relay function activates, quickly adjusting the hands to the correct time.

The power save function can be activated automatically or manually.

Automatic Power Save Function: Activates if the watch is left untouched for approximately 72 hours.
Manual Power Save Function: Can be activated by pulling out the crown to the first click and pushing it back to the normal position within one second.

While the power save function is active, the built-in IC continues to compute the time, ensuring the watch is ready for immediate use. The time relay function automatically adjusts the hands to the time retained inside the watch once a certain amount of electricity is generated by swinging it for 2 to 3 seconds. The hour and minute hands adjust first, followed by the second hand.

Important Technical Specifications

Movement Size:
- Outside diameter: Ø26.4 mm
- Casing diameter: Ø25.6 mm
- Height: 3.95 mm
Time Indication: 3 hands (hour, minute, second). Hour and minute hands move at 10-second intervals; the second hand moves at 1-second intervals.
Driving System: Step motor (load compensated driving pulse type, 2 pieces).
Additional Mechanisms:
- Automatic generating system
- Energy depletion forewarning function
- Overcharge prevention function
- Electronic circuit reset switch
- Train wheel setting device
- Date calendar
- Instant setting device for date calendar
- Automatic power save function
- Manual power save function
- Time relay function
Loss/Gain: Monthly rate at normal temperature range: less than 15 seconds.
Regulation System: Nil.
Measuring Gate by Quartz Tester: Use 10-second gate.
Power Supply:
- Power generator: Automatic generating system.
- Electricity Storage Unit (E.S. Unit): Titanium lithium ion rechargeable battery.
Operating Voltage Range: 0.45 V ~ 2.5 V.
Duration of Charge: Validity of time relay function: Approx. 4 years (full charge).
Jewels: 13 jewels.

Usage Features

Hand Installation: Unlike conventional quartz movements, hands are not installed immediately after date changes. For Cal. 5J22A, pull the crown to the second click, turn counterclockwise until the date numeral moves and stops, then install the hour hand at 12 o'clock, followed by the minute and second hands.
Date Adjustment: The time relay function does not adjust the date. If the date is incorrect after activation, it must be adjusted manually.
Power Reserve: If fully charged, the power save function can keep the watch operating for about four years. If the power reserve is completely depleted while power save is active, the time relay function may not activate by swinging; instead, the second hand will start moving at two-second intervals.
Charging: Swinging the watch approximately 500 times at 2-3 swings/second will start the second hand moving at one-second intervals from a depleted state. Approximately 200 swings will reserve one day of power. Wearing the watch continuously for 12 hours accumulates about 1.5 additional days of power reserve. Wearing it for 12 hours daily for a week secures about 10 days of power reserve, which translates to approximately 2 months of operation with the power save function active.
Manual Power Save Activation: Pull the crown to the first click and push it back within one second. Do not pull the crown to the second click while power save is active, as this will erase retained time. Manual power save cannot be activated if the second hand is moving at two-second intervals.

Maintenance Features

Disassembly and Reassembly: Use a universal movement holder. When removing the winding stem, pull the crown to the first click, then push the setting lever. Removing the stem at the normal position may prevent it from being reinserted.
Lubrication: Specific parts require lubrication with Moebius A, Moebius F, or Seiko Watch Oil S-6, in normal or liberal quantities, as indicated in the diagrams.
Circuit Block: Ensure elastic portions are securely set to guide tubes. Press down on indicated areas after setting to ensure proper seating.
Oscillating Weight: Before tightening the screw, ensure the oscillating weight wheel gear engages securely with the intermediate wheel pinion. Tighten firmly; a loose screw can cause defective electricity generation. Lubricate the ball-bearing as shown.
Rechargeable Battery Unit: To remove, pry up the "A" portion gap with tweezers. To install, set the minus lead terminal to guide post "B" and push down "C" portion vertically. Avoid short-circuiting terminals and never clean the unit.
Coil Block Resistance Check:
- Second coil block: 2.00 KΩ ~ 2.45 KΩ.
- Hour and minute coil block (driving hands): 1.00 KΩ ~ 1.20 KΩ.
- Hour and minute coil block (detecting generation): 280 Ω ~ 360 Ω.
- Generating coil block: 340 Ω ~ 440 Ω.
- Measure resistance after installation for stable readings.
Leakage Check (Hour and Minute Coil Block): If hands do not move smoothly, check for leakage between driving and generation coils. Apply tester probes to specified patterns. Infinite resistance indicates no leakage; less than 2 KΩ indicates leakage, requiring replacement.
Current Consumption Measurement:
- Whole Movement (hands moving): Less than 0.63 μA (with 1.55 V). Disassemble parts, remove battery unit, reassemble oscillating weight. Apply minus terminal to "a" portion and plus terminal to circuit block cover A. Swing oscillating weight for >3 seconds to switch IC to normal hand movement mode.
- Circuit Block Alone (power save): Less than 0.13 μA (with 1.55 V). Connect tester. Short-circuit "A" portion and input pattern (-) for ~1 second to switch IC to normal mode. Protect from light for accurate readings. High consumption indicates a defective circuit block.
Automatic Generating System Check: Measure initial battery voltage. Swing watch 200 times (2-3 swings/second, 20 cm arc). Measure voltage again within 3 minutes. Voltage increase of 0.1 V (for initial 0.45-1.0 V) or 0.05 V (for initial 1.01-1.2 V) indicates normal operation.
Troubleshooting: A dedicated guide provides solutions for common issues, such as reduced hand movement quickness, abnormal oscillating weight rotation, current consumption exceeding standard values, and power save function activation problems.