|Solving problems caused by electrolytics has never been easier, now that you can locate these bad capacitors easily without having to unsolder them and without spending time troubleshooting by using the CapAnalyzer88A||
|As a cap ages,
it can cause problems in the particular circuit it is in. In a TV vertical
section, it can cause overlap or overscan problems. In the audio section
it can cause distortion or low audio. In the syscon supply it can cause
intermittent functions and mpu confusion. In the video circuits it can cause
a fully scrambled picture. In servo circuits,it can cause unstable speeds.
Most VCRs and big screens also use surface mounted electrolytics in the
sound MPX decoder module and video PIP and convergence circuits. In camcorders
they can cause problems in the servo,audio and video circuits.
Measuring a cap in circuit is more difficult than measuring a resistor, because circuit resistance and capacitance can affect readings. Some "Capacitor checkers" claim to work in circuit, but they give such erroneous readings you have to unsolder and re-measure each one out of circuit anyway. some of the most expensive capacitor meters will not always measure the capacitance at two different frequencies and show it as two different readings! The trick to locating bad capacitors in circuit is not to measure capacity at all, but instead, to measure its Equivalent Series Resistance(ESR) and DC Resistance(DCR). A perfect capacitor will measure as an open circuit at DC, and will show less resistance as the frequency across it increases. Most meters utilize this fact by measuring a cap's impedance at a fixed frequency such as 1KHZ and translating the reading to capacity. In reality, checking a cap at 1KHZ is pointless in television, and in PWM power supplies,frequencies of 100KHZ and higher are used. It makes more sense to forget about measuring capacitance altogether, and use out knowledge that either DCR or ESR will change drastically in defective capacitors.
The CapAnalyzer88A-II is the only device that will measure both DCR and ESR automatically. Other ESR meters have their limitations, they don't check DCR for leaky or shorted caps and you must discharge each cap before testing or risk damage to the meter. Their probes add their own capacitance, and readings vary depending on the position that probes are held. Also, these meters usually don't use a frequency high enough to isolate the specific capacitor to be tested. The CapAnalyzer88A-II uses a test frequency higher than the others, automatically discharges the cap under test, checks DCR, which you can preset the value to beep a warning at, then checks and displays ESR on a 20 segment LED bar scale, and beeps from one to five beeps depending on the ESR condition of the cap. Both DCR and ESR measurements are under 50 millivolts so that no active devices are mistakenly turned on. Because it checks DCR first, it will alert the technician immediately if the cap or anything else in that circuit is shorted or leaky, before it checks ESR.It includes a low-capacitance on-handed tweezer test probe for accuracy and ease-of-use. Because it is microprocessor controlled, it has more features and is much more accurate than the older designs.A three-color chart on the front panel shows typical ESR readings of good and bad caps depending on their capacitance.
So make your job easier, and get your own CapAnalyzer88A-II.
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