1. Sensitivity variation
Optical mouse sensitivity variation is common fault , specific performance is move the mouse , the cursor is unresponsive , do not listen to the command . Failure cause and solution is :
1 ) LED , or the aging of photosensitive components : optical mouse integrated within the core of IC has a constant current circuit , the LED operating current constant at about 50mA, high-grade intermittent sampling technique commonly used mouse , send the current is intermittent conduction of ( Sampling frequency of about 5KHz), can be subject to the same dell xps m1330 battery power to improve detection LED power , from toshiba pa3399u-1bas, so high sensitivity . Some optical mouse manufacturers to improve the sensitivity , increased man-made light-emitting diode operating current , increase of transmission function . This will lead to early aging of light-emitting diodes . At the receiving end , if using low quality phototransistor , long working hours , and also the natural aging , resulting in deterioration of sensitivity . At this point, only the replacement of the same type of LED or photodiode .
2) Optical Receiver System Offset, focal length is not aligned . Optical Mouse is the use of two pairs of mutually perpendicular within the photoelectric detector , with photovoltaic panels to work . Issued from the vgp-bps8 light emitting diode , light in the optical panel , the reflected light by the focus once again after reflection by the mirror , adjusting its transmission path , by photodiode receiver to form a pulse signal , pulse signal and phase determines the number of mouse Moving speed and direction . Launch and the lens optical mouse System Components are combined in one , fixed the mouse ‘s casing , while the phototransistor is fixed at the circuit board , the location of the two must be quite accurate , factory calibration of the position, the LED fixed with vch hot melt adhesive The lens components , and if the use of the process, touching or shaking the mouse was cast too large , it is possible to make hot melt off , LED shift . If the light-emitting diodes deviate from the calibrated position , from the photovoltaic panels to the light reflection could not reach the photodiode . At this point , we must patiently adjusting LED position , so as to restore in situ until the horizontal and vertical direction to move the pointer up to the most sensitive , and then glue a small amount of 502 LED fixed position, close the lid can be .
3) The impact of outside light . In order to prevent external light effects , the exposed part of the lens component is the opaque black paper cover , and so light in the black box is passed , if the black paper off , leading to the outside world to the photodiode light shines on , it will cause photosensitive Tube saturation , the data are not the right signal processing circuit , resulting in lower sensitivity .
4 ) lens channel with pollution , so that light can not be successfully reached . Because of poor working environment , with pollution, long time , and dirt attached to the LED , photodiode , lens and mirror surface , blocking the light receiving optical path so that unreasonable . Approach is to use cotton balls dipped ethanol scrub , scrub the parts , including LED , sony vgp-bps9 battery, lens and mirror , photodiode surface , we should pay attention to ethanol must be pure , or else they will become more dirty washing , can also use the water Ethanol washing , the targeting lens and reflective lens Oh deep breath, and then gently wipe clean cotton swab , until smooth as ever been .
5) PV panels wear or malposition . Optical mouse optical black and white board bearing many small lattice , light to dark when the grid was a black absorption phototransistor will not receive the reflected light . On the contrary , if the shine white lattice on the phototransistor will be able to receive the reflected light . Use , be aware of photovoltaic panels clean and good photographic conditions , while the mouse position relative to the photovoltaic panels to be positive and have skewed position of photovoltaic panels or photovoltaic panels wear severe , then make the reflected light pulse distortion or blurred Clear , the circuit can not identify which led to deterioration of the mouse sensitivity .
2 . mouse positioning allowed
Failure showed the mouse position uncertainty or drift often occurs for no reason , failure reasons are:
1) The impact of stray light from outside . Right now the pursuit of some pretty good light transmittance beautiful shell , if the optical shield is not good, plus around the light interference , then it is easy to affect the transmission of optical signals within the vgp-bpl5a mouse , the interference of pulses will be generated Malfunction caused the mouse .
2 ) There are Weld circuit if the circuit will cause interference mixed pulses , the circuit from working properly . At this point, need to carefully check the circuit solder joints , especially in certain vulnerable to power the site. Found that Weld point, electric soldering iron can repair welding .
3 ) poor quality crystal , or IC , affected by temperature , so that frequency drift instability or generated , then , can only use the same model , with the frequency of the integrated circuit or the crystal replaced .