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Repair of APC Smart UPS 700 - SU700INET
Complaint: Device went into overload shut off and alarm, with low load of 100 Watt.
Suspected: C48 in series with R69 200 Ohms, located near IC8 TL064, in parallel with secondary of current transformer CT2 for load power measurement.
Measured: C48 lost all capacitance.
Replaced C48 with 100uF/25V restored correct measurement of load and UPS is functioning normal again.
Repair possible thanks to good schematic found here at remont-aud.net, thanks very much!
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