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Failure	Symptoms
No overcharging protection.	In the test process, the displayed value of over- charging voltage keeps going up far beyond 4.2V before the overcharging indicator goes out.
Fails to fully shut off after overcharging protection.	When the displayed value of overcharging voltage e- xceeds 4.2V or 4.3V, the overcharging indicator be- comes dim but remains in this status all the time.
With battery voltage drop after overcharging protection, overch- arging protection switch turns on again and resumes charging.	When the displayed value of overcharging voltage exceeds 4.2V or 4.3V, overcharging protection is activated and overcharging indicator goes out. How- ever, the overcharging indicator lights up again a- nd the first test procedures is resumed before the second test procedures is started. It goes on and on like this
Overcharging voltage for protec- tive plate is excessively high.	After charging voltage enters protection,the prote- ctive plate is not shut off on time.Therefore,over- charging voltage is excessively high.
The static current of the prote- ct ive plate is excessively gr- eat or its short circuitThe st- atic current of the protective plate is excessively great or its short circuit protection speed is excessively great (the same protective plate).	The protective plate has excessively great impact on battery voltage. For example, static = 2.5uA wh- en battery voltage is 4.00V; static = 6.2uA when b- attery voltage is 4.05V.
With battery voltage drop after overcharging protection,it fails to fully shut off and overchar- ging protection switch turns on again and resumes charging.	When overcharging voltage exceeds 4.2-4.3V,overch- arging protection is activated and overcharging in- dicator becomes dim. However, the overcharging in- dicator becomes brighter before the second test pr- ocedure is started. This goes on and on in the fir- st test procedure.
Field effect tubes (FET) are br- oken and cannot charge,including protective plates whose wires cannot work unless battery voltage is higher than 1.2V.	Overdischarging test lasts a very short time and displays excessively low voltage value.
No overdischarging protection	In overdischarging test, static test does not begin until voltage in overdischarging display approaches 0V.
Static current exceeds 200mA	In static test, the displayed value of current is “1”.
Protective plates assembled with used ICs.	Short circuit protection speed is instable or excessively great.

The general breakdown reason and removes the method：
　　　
　　1.Opening machine does not have any demonstrated that.

　　　A) inspects the 220V power source whether puts through;

　　　B) inspects the protective tube whether burns out;

　　　C) between inspection machine in four tables head plates and motherboard coupler plug

　　　　 whether does insert;

　　　D) if still had the question, please with merchant relation.
　 2.Some sufficient demonstrations, has not had has put the voltage to demonstrate that,

　　A) the possible this fender not to have has put the protection;

　　B) trades other types the fender to carry on the test,proved this instrument is whether

　　　 normal;

　　3.When test, like discovered some machine when "short-circuits the protection speed" the

　　　value with other machine to test to the value deviation is big, please do inspect four
　
　　　plugs which and the instrument connects whether loses the elasticity not with the instr-

　　　ument close connection; After the instrumentation 1 - 2 years time, discovered measured

　　　to "short-circuits when the protection speed" the value and the standard value deviation

　　　too is big, the please replacement machine in lithium electricity core, this electricity

　　　core may use this machine in identical model electricity core to replace, its target is:

　　　V (voltage) 4.00V±0.1V R (interface resistance) <= 80m Omega C (capacity) >= above 1000-

　　　mAh.

　　4.After the start measuring instrument, does not have the value, demonstrates 0000 (as so-

　　　on as to measure but);

　　 A) inspects the slotted line is otherwise is cut off;

　　 B) inspects on the fender B +, B -, P - the hole which assigns with the instrument on whe-

　　　　ther corresponds;
　　 C) like still had the question, please with factory relation.
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

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