1. The fault phenomenon: when open the instrument, the screen no display, light is not bright;When an external power supply, low battery voltage alarm, then the machine automatically shut down;Not when external battery, low battery voltage alarm, then automatically shut down, even to charging machine is useless.


2. Review method:


(1) under the condition of the instrument not pass an alternating current, check whether the 12 v voltage on the low side.The fault alarm that the power board detection part to low voltage, output voltage can be output power board test part is out of order or power board failure, may also be a back-end load circuit failure cause.


(2) has a battery when loading, this phenomenon shows that the monitor work in the state of batteries and battery almost exhausted, AC input does not work properly.May the reason is: 220 v power socket itself without electricity, or fuse.Multi-parameter monitor


(3) is not an external battery, the judge may be a rechargeable battery is broken, or the battery can't charge caused by the failures of power board/charging panel.


3. Method: connect all parts reliable connection, connected to an alternating current recharge instrument.