TMI TIME MODULE

Movement Overview and Dimensions

The TMI Cal. YM92A is an analog quartz chronograph movement designed for 12-ligne center second applications. It features a tuning fork quartz oscillator operating at 32,768 Hz.

Dimensions:

• Outside diameter: Ø27.60mm (12H-6H) × 24.00mm (3H-9H)
• Casing diameter: Ø27.00mm (12H-6H)
• Total height: 3.70mm (including battery)

Accuracy: ±20 seconds per month (on wrist)

Operating Temperature Range: -5°C to +50°C

Regulation Device: Nil (Pre-adjusted)

Indicators and Functions

Hands:

• 3 Hands: Hour hand, Minute hand, Second chronograph hand (Center)
• Small hands: Hour and minute chronograph hand (6H), Small second hand (9H), 1/20 second chronograph hand (12H)

Calendar: Instant setting device for date calendar.

Reset Switch: Included.

Power Depletion Warning (BLD): Functionality present.

Setting Mechanism:

• Crown at normal position: Free
• Crown pulled out 1st click: Instant date change
• Crown pulled out 2nd click: Time setting / Reset
• Chronograph hand reset is also available.

Stopwatch Functions:

• 2H button: Start / Stop
• 4H button: Split / Reset

Note: The small second hand moves at 2-second intervals.

Movement Features

• Jewels: 0 Jewel
• Anti-magnetism: Over 1600 A/m (Direct current magnetic field)
• Maximum unbalance of hands:
• Small second hand: 0.03 µN·m
• 1/20 second chronograph hand: 0.03 µN·m
• Minute chronograph hand: 0.03 µN·m
• Second chronograph hand: 0.06 µN·m
• Minute hand: 0.70 µN·m
• Inertia of second hand's moment: Less than 0.2 µg·m²

Battery Information

• Type / Size: Silver oxide battery / Ø9.5mm × t 2.73mm
• Recommended battery: SR927SW
• Nominal voltage: 1.55 V
• Battery life: Approx. 3 years
• Driving current consumption: Approx. 0.80 µA
• Operation stopping voltage: 0.9 V

Separated Parts (Parts Code)

Test of Accuracy

All specifications are subject to change without notice.

Appearance Diagram

The movement's appearance is illustrated with top and bottom view diagrams. The top view shows components like the setting stem, circuit block hold, battery, coil blocks, crystal oscillator, and battery clamp. A table indicates the 'Hands type' as 'YM92A**' with a 'Mark: 2'. The bottom view details the dial leg holes (A and B), various wheels (1/20 sec. chronograph wheel, small sec. wheel, minute chronograph wheel, hour chronograph wheel), and components for the date indicator mechanism.

Casing Diagrams

Diagrams illustrate casing dimensions and features. These include overall dimensions like Ø2640 ±5, and specific heights H1 (Maximum height from dial support: 246.5) and H2 (Total height incl. movement: 576.5). The diagrams also show the center post, pullout stroke for the setting stem, and button strokes for the 2H and 4H buttons. A top view of the casing indicates diameters such as Ø2700 ±3 and Ø2760 ±3, along with angular references.

Hand Fitting Diagrams

Detailed diagrams show various wheels used in the movement, including the Hour wheel, Center wheel, Sec. chronograph wheel, Small sec. wheel, Minute chronograph wheel, and Hour chronograph wheel. Dimensions (L1-L10, T, R) for these wheels are provided in tables, along with their respective 'Parts No.'. Unbalance values for different hands (Small sec., 1/20 sec. chronograph, Minute chronograph, Second chronograph, Minute) and the moment of inertia for the second chronograph hand are also listed.

Hand Setting Stem Diagram

The hand setting stem is depicted with key dimensions S1, S2, and S3. A table provides 'Part No.' for two types: Type-1 (Standard) and Type-2 (Long), along with their specific S1, S2, and S3 measurements. The stem is noted as being made of Steel with a hardness of Vickers 600±50. A symbol indicates that a portion of the stem is not threaded.

Dial Diagrams (01-04)

Four types of dial layouts (Dial-01, Dial-02, Dial-03, Dial-04) are presented with precise measurements. Each diagram shows the placement and dimensions of holes for the small second hand, 1/20 sec. chronograph, hour chronograph, and minute chronograph. Specific dimensions include hole diameters (e.g., Ø90 ±5, Ø185 ±5, Ø140 ±5, Ø75 ±2) and their radial and angular positions relative to the dial center. Dial-04 features a distinct larger hole (Ø220).

Casing Ring Diagrams (01-02)

Two types of casing rings are detailed: Type 1 (Standard, Part Code: 0866650) and Type 2 (Special, Part Code: 0866789). Diagrams show their circular shape with various angular references and dimensions, including diameters like Ø2840 ±5 and Ø3004 ±5. Cross-sectional views (A-A', B-B', C-C', D-D', E-E', F-F', 0-12H, 0-3H, 0-9H sections) illustrate the contacting surfaces with the movement and case. Type 2 includes a note stating its inside case diameter is the same as the YM5 series.

Assembly and Handling Instructions

1. How to change the battery: Use the exclusive battery for stable performance. Ensure the minus part faces inward. When assembling or changing the battery, it is recommended to first pull out the two battery clamp screws, then remove the battery clump to avoid damaging the movement. If assembling without removing the clump, refer to diagrams for correct battery insertion direction. The battery should be positioned under the circuit holder. System-reset is not required. Set the 1/20 second CG hand, hour CG hand, and minute CG hand to the 12H position.

2. How to pull out the stem: Pull the crown to the 1st click, then pull out the stem while pressing the hollow part of the setting lever with tweezers. The stem cannot be pulled out if it is not in the 1st position.

3. Attention to set each hand: Hands move at one-second intervals. Set each hand to the correct position on the dial to avoid mistakes. Do not force the hour hand.

4. How to take off the hand: Use fork-shaped exclusive tools. Do not remove the dial while hands are assembled.

5. How to test the accuracy: Measure timing using a Quartz Tester in a 10-second gate.

Casing Part Structure Notes

1. Minute hand: The second wheel has a safety stopper to prevent the minute hand from being pushed too hard. Pay attention to friction between the hour and minute hands.

2. Casing ring: Use the exclusive casing ring to securely fix the movement within the case and stabilize the button switching stroke. Refer to the 'Casing ring' page instruction for shape and tolerance details.

3. Case: Use a metal case to prevent the movement from malfunctioning due to static electricity.

4. Hour wheel: The hour wheel is made of plastic. Repeated re-assembly of the hour hand may reduce its fixing torque. To maintain sufficient fixing torque, do not change the hour hand more than 5 times.

Operation Instructions

The movement features chronograph functions operated via the crown and two buttons (2H and 4H).

Crown Operations:

• 0 Click (Free): Turning the crown is free.
• 1st Click: Turning the crown clockwise changes the date.
• 2nd Click: Turning the crown allows for time adjustment.

Button Operations (with Crown at 0 Click):

• 2H Button: Chronograph Start/Stop.
• 4H Button: Chronograph Reset, Split Start/Stop.

Chronograph Hand Setting (CG Reset):

• Push 2H button (2 sec) for 1/20 Second Chronograph Hand O-setting. The 1/20 second chronograph hand moves, then time adjustment is available.
• Push 2H button (2 sec) for Second Chronograph Hand O-setting. The second chronograph hand moves, then time adjustment is available.
• Push 2H button (2 sec) for Minute/Hour Chronograph Hand O-setting. The minute/hour chronograph hands move, then time adjustment is available.

Detailed Chronograph Operation (Crown 0-Click):

Total Time: START (Push 2H), STOP (Push 2H), RESET (Push 4H).

Accumulated Time: START (Push 2H), STOP (Push 2H), RESTART (Push 2H), STOP (Push 2H), RESET (Push 4H).

Split Time: START (Push 2H), SPLIT (Push 4H), RESPLIT (Push 4H), STOP (Push 2H), RESET (Push 4H).

Note: The 1/20 sec chrono hand stops running after 10 minutes, but the inside mechanism continues calculating.