During spring cleaning last year, we found the JR G5000T Extreme Tail Lock Gyro from one of our helicopters quitted working. Since this is the only as well as the last JR brand gyroscope, we did not bother troubleshooting and replace it with a Futaba unit. Time went on and the G5000T sitting in our spare parts box marked “DEAD” until today.
Well, what about a teardown and learn about the design together?
Here is a brief history on G5000T. It was released in 1999 as JR flagship product, a lower end version G550T Advanced Tail Lock Gyro also released around the same time. Both products share the same look (i.e. Sensor Casing and Enclosure).
- Almost entirely consists of SMT (Surface Mount Technology) being used
- 1mm light weight PCB (Printed Circuit Board)
- muRata ENC Series piezoelectric vibrating gyroscope sensor
- Mitsubushi M5207 Linear control dual VCA (Voltage Control Amplifer) IC
The sensor is housed in a vibration-dampened case that is plated with a heat-reflective coating. Let’s take a close look.
Top view of the sensor module
Opening up the base, you will see the bottom soft rubber cap and the damping capsule
The damping capsule is taken out, still coated with white lithium grease. The rubber cap is moulded out of very soft rubber, one on top and one at the bottom. The plastic ring is sandwiched at the center.
The sensor is mounted vertically between the caps (Note the PCB extends out on both ends and are slotted to rubber cap), thus suspended vertically.
PCB board bottom. Note that the three wires lead back to Gyro Amp.
Japan MuRata Piezoelectric vibrating gyroscope sensor 03JB (24kHz resonance frequency), datasheet.
Side view of PCB board
Top, front and back view