TECHNICAL COMPARISON • TOKYO KEIKI FLAGSHIP
TG-8100 (STANDARD IMO) • TG-8600 (HSC 70 KTS)
BAMS COMPLIANT • FAST SETTLING
The Tokyo Keiki (Tokimec) TG-8100 and TG-8600 represent Tokyo Keiki’s flagship marine gyrocompass family, succeeding the renowned TG-6000 and TG-8000/8500 series. The TG-8100 is designed for standard commercial ships compliant with IMO A.424(XI) / ISO 8728, while the TG-8600 is engineered specifically for High-Speed Craft (HSC) capable of speeds up to 70 knots conforming to IMO A.821(19) / ISO 16328 HSC.
Up to 70 Knots (TG-8600)
75°/sec (Both Models)
Programmable Startup
BAMS C / W / A Relay
Tokyo Keiki TG-8100 / TG-8600 Family
High-Speed Follow-Up & Redundant Bridge Interfaces
The TG-8100/8600 from Tokyo Keiki is designed based on the previous TG models of Gyrocompass, maintaining exceptionally high reliability while delivering enhanced follow-up dynamics:
- Speeds up to 70 Knots: TG-8600 specifically engineered for high-speed catamarans, fast ferries, and interceptors.
- Interfaces with External Heading Sensor: Integrated comparison and backup fallback from GPS or secondary gyros.
- Startup Timer Function: Programmable pre-departure timer gets the compass settled prior to sea trials or departure.
- Bridge Alert Management System: Complete BAMS handshake meeting latest IMO bridge alert escalation criteria.
1. System Architecture & Module Overview
The system consists of two core components plus optional distribution and display interfaces:
- Master Compass Unit (MGC): Houses the precision gimbal ring assembly, container/damping vessel, step-transmitting motor, dynamic follow-up mechanism, and the suspended sensitive element.
- Control Unit (GCU): Available in Type S (Single gyro configuration, ~16 kg) and Type D (Dual gyro system, ~23 kg). Contains the system power supply, microprocessor CPU boards, inverter drives, and signal distribution amplifiers.
-
Operation / Display Panel (DPU / PNU):
- Standard 1-DIN console with 7-segment LED heading readout.
- 2-DIN color LCD console (prepared for setups integrated with the TF-1000/900 Fiber Optic Gyrocompass).
- Dedicated BAM (Bridge Alert Management) indicators (C: Caution, W: Warning, A: Alarm).
2. Technical Specifications & Operating Parameters (TG-8100 vs. TG-8600)
| Feature / Parameter | Tokyo Keiki TG-8100 | Tokyo Keiki TG-8600 |
|---|---|---|
| Application Scope | IMO Standard Commercial Vessels | High-Speed Craft (up to 70 knots) |
| Conformity Standards | IMO A.424(XI), ISO 8728 | IMO A.821(19), ISO 16328 HSC |
| Follow-Up Rate | Up to 75°/sec | Up to 75°/sec |
| Settling Time | < 4 hours (typically within 3 hours) | < 4 hours (typically within 3 hours) |
| Settling Error | Less than ±0.3° | Less than ±0.3° |
| Repeatability | ±0.2° | ±0.2° |
| Main Power Supply | AC 100 / 110 / 115 / 220V (1φ, 50/60 Hz) | AC 100 / 110 / 115 / 220V (1φ, 50/60 Hz) |
| Emergency Power Supply | DC 24V (automatic switchover) | DC 24V (automatic switchover) |
| Power Rating | 140 VA (Start) / 70 VA (Run) | 140 VA (Start) / 70 VA (Run) |
| Interface Outputs | Serial IEC 61162-2 / Step / Rate of Turn (ROT) | Serial IEC 61162-2 / Step / Rate of Turn (ROT) |
3. Part Numbers: PCBs, Spares & Field Replaceable Assemblies
Tokyo Keiki part numbers follow an 8-to-10-digit format (predominantly beginning with 1018xxxx or 1022xxxx). Below is the comprehensive engineering directory of field-replaceable units (FRUs), assemblies, and consumables:
A. Printed Circuit Board (PCB / PWB) Assemblies
| PCB Designation | Function / Module | Part / Assembly Number | Engineering Notes |
|---|---|---|---|
| SCC PWB | System / Servo Control Computer Board | 10189521- / 10189661- | Master CPU board (Requires FW v2.21+ on newer units) |
| PWB_LPANEL | Local Display Panel Controller PWB | 10189665- / 10189689- | Standard 7-seg & LCD display driver |
| 2nd Servo Amp PCB | Follow-up Servo Amplifier Circuit | 102290450 | Drives azimuth follow-up servo motor |
| Inverter PWB / Ass’y | Rotor Static Inverter Drive | 1018xxxx / INV-OCT | Drives the 3-phase high-frequency rotor |
| Step Amplifier PCB | Output Distribution / Repeater Driver | Step Amp Ass’y | Drives classic stepper gyro repeaters |
| GTERM-A PWB | Master Terminal Board | Control Unit Interface | Power distribution, contact alarms, fuses |
| C-TERM / ESCC PWB | Interfacing / Serial Comm Buffer | Serial (SIFC) / Step (MIFC) | Handles IEC 61162-2 / NMEA 0183 / BAMS lines |
B. Sensitive Element & Mechanical Spares
| Part Description | Tokyo Keiki Part / Type No. | Usage & Overhaul Intervals |
|---|---|---|
| Gyrosphere / Sensitive Element | 10229409 (or L8082SF / LZ047QYSF series) | Core rotor ball suspended in fluid; ~35,000–50,000 hrs |
| Supporting / Flotation Liquid | Tokyo Keiki Gyro Fluid Kit | Silicon/mineral damping oil replacement (every 1–2 yrs) |
| Master Follow-up Belt | Drive Belt (Master azimuth gear) | Replaced during major standard overhaul |
| Slip Ring & Brush Block Ass’y | Slip Ring Pick-up Ass’y | Transfer contacts between rotating gimbal & chassis |
| Follow-up / Servo Motor | Azimuth Follow-up Motor | Powers the dynamic track mechanism |
| Mercury / Contact Level Ass’y | Leveling Sensor Assembly | Horizontal tilt sensing & damping control |
C. Standard Overhaul & Annual Kit Consumables
- Packing Gaskets & O-Rings: Master compass container seal rings, oil reservoir sealing gaskets.
- Filter Element & Desiccant Kit: Air vent breather packing and silica drying bags.
- Illumination Lamps: Part 10004345 (45V 5W, E12 base socket) for analog repeater heads and dials.
4. Maintenance & Service Highlights
Advanced Torsion-Wire Suspension System
Unlike gas-bearing or spherical ball-supported gyros, the Tokyo Keiki system uses a sphere suspended in oil by torsion wires, minimizing mechanical friction, extending rotor motor longevity, and providing superior resistance against vessel shock and slamming in heavy seas.
BAMS Alert Transfer & Escalation
Pre-configured relay and software handshakes integrate directly into bridge alert management systems (cautions, warnings, and alarm escalating levels). When integrated with BAM, faults automatically register on the central bridge alert display with acoustic mute and acknowledge protocols.
Pre-Departure Timer Function
Allows operators to preset gyro warm-up (typically programmed 3 to 4 hours prior to engine telegraph readiness) to eliminate waiting at berth.
Ordering Parts or Diagnosing a Breakdown
If you are ordering specific replacement parts or diagnosing a breakdown onboard, please share:
- The alarm / warning code displayed on the DPU/PNU panel (e.g. ALARM-01, WARNING-03).
- The serial number of the master compass unit (MGC).
- The specific PCB assembly tag or part number stamped on the board.
Our technical support team can immediately verify exact component cross-references, firmware revisions (e.g. FW v2.21+), and arrange dispatch or onboard attendance.
Tokyo Keiki TG-8100 & TG-8600 Technical Support
Contact Seanav Marine for immediate spare parts procurement, sensitive element renewals, PCB exchanges, or annual gyro overhauls across UAE, India, Oman, Egypt, Singapore, and international shipping hubs.
Seanav Marine Technical Operations Desk
Official technical release published by Seanav Marine Technical Services LLC • Dubai Maritime City (UAE) & Mumbai (India) • Verified Marine Gyrocompass Reference.
