Pointer Wan Table Repair ----- Meter Repair

Keywords: pointer multimeter repair Pointer type multimeter maintenance Fault phenomenon: a TY360 pointer universal meter. Transfer the range switch to the R × 10K gear. The table will automatically point to hundreds of kΩ. The adjustment mechanical zero knob cannot return an infinity position. Overhaul: Open the cover, carefully check the precision resistance, capacitance and diode on the battery and board, and the remaining components are finished in addition to the C1 breakdown leakage. The table circuit is shown in the drawings. The fault remains after replacing C1. Next, each of the printing lines, each of the printed lines were cleaned, examined, and it was found that the slit between the diode D6 and the resistance R2 solder joint was burned and a dirt. The insulation resistance is greatly reduced, which is equivalent to the R × 10k blocking a resistance of a few hundred dry Europe. then. Clean this short path and remove R2, away from D6 reinstallation, R × 10K returns normal measurement. Author: Shen Yinmin

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