Re: trying to fix a 6V 0.5A T1 (Transformer) AD050120T2 power supply
I took some readings with a multimeter with the adaptor plugged in.
Voltage and temperature tests. Powered on. Insulated jacket, rubber gloves, protective goggles.
Voltage Tests (Powered On)
F1 = 1.5mV AC. ~ 0V DC.
C1 = 335 V DC. 0 V AC.
C3 = 1.3 V DC. 0 V AC.
Temperature Tests (Powered On)
Equipment = a digital room thermometer with insulated probe on a plastic stick.
Everything I tested was at room temperature. I think that was weird. I expected if U1 and Q1 were working they would be above room temperature.
I also tested the largish smd diodes (M7...Schottky) on the reverse side and the small smd capacitors and the resistors near U1. They were all room temperature.
I tested the transformer, both inductors and the fusable resistor and they were all at room temperature.
Any advice is appreciated.
Should F1 have more voltage?
Does the measurement on C3 show U1 is broken?
I took some readings with a multimeter with the adaptor plugged in.
Voltage and temperature tests. Powered on. Insulated jacket, rubber gloves, protective goggles.
Voltage Tests (Powered On)
F1 = 1.5mV AC. ~ 0V DC.
C1 = 335 V DC. 0 V AC.
C3 = 1.3 V DC. 0 V AC.
Temperature Tests (Powered On)
Equipment = a digital room thermometer with insulated probe on a plastic stick.
Everything I tested was at room temperature. I think that was weird. I expected if U1 and Q1 were working they would be above room temperature.
I also tested the largish smd diodes (M7...Schottky) on the reverse side and the small smd capacitors and the resistors near U1. They were all room temperature.
I tested the transformer, both inductors and the fusable resistor and they were all at room temperature.
Any advice is appreciated.
Should F1 have more voltage?
Does the measurement on C3 show U1 is broken?
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