Aon ZAG-3A electronic health hand warmer

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As shown in the figure, the Aon ZAG-3A electronic health care hand warmer circuit. Temperature out of control means that the temperature deviates from the (70 ± 5) °C set by the thermostat.
Disassemble the housing and use a small screwdriver to adjust the thermostat's thermostat screw. Adjust clockwise, the temperature rises; counterclockwise adjusts, the temperature decreases. Adjust the temperature carefully by carefully adjusting it repeatedly. After the temperature is adjusted, the varnish should be dripped on the head of the thermostat to seal it to prevent it from getting out of control again.