Omron M2 Basic - Teardown

We take a look inside this Blood pressure monitor by Omron.
This is they type you may find at the doctors surgery.

It has a fault with what I believe is a solenoid responsible for deflating the cuff after measurement has been taken. This is causing the cuff to stay inflated slightly or for it to not inflate at all.
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SOME TECHNICAL INFO

Product Description Digital Automatic Blood Pressure Monitor
Model OMRON M2 Basic (HEM-7116-E/HEM-7116-E8)
Display LCD Digital Display
Measurement Method Oscillometric method
Measurement Range Pressure: 0 mmHg to 299 mmHg
Pulse: 40 to 180/min.
Memory Last measurement
Accuracy Pressure: ±3 mmHg
Pulse: ±5% of display reading
Inflation Automatic by electric pump
Deflation Automatic pressure release valve
Pressure Detection Capacitive pressure sensor
Power Source 4 “AAA” batteries 1.5V or AC/ DC adapter
(optional, 6V 4W)
Battery Life Capacity of new alkaline batteries is approx. 300
measurements
Operating Temperature/
Humidity
10°C to 40°C/ 30 to 85% RH
Storage Temperature/
Humidity/ Air Pressure
-20°C to 60°C/ 10 to 95% RH/ 700-1060 hPa

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