So long story short, I bought a cheap yet nice-sounding local keyboard amp. However, after 20-30 hours of usage, it stopped working, completely dead.
I took it apart and found that the primary transformer winding breaks (open circuit). Given that the transformer is blank, with no marking whatsoever, looks like the easiest replacement would came from the manufacturer. So the manufacturer sends me out a new transformer for the amplifier for free.
Worry of having the same issue in the future, I decided to measure the new transformer so I can get a replacement myself if it breaks again.
However, I'm stuck on the D-E-F outputs measurements. The resistance on D-F and E-F shows zero?? Yet the voltage seems weird too. Would be glad if someone can enlighten me.
Voltage (AC)
2 - 3 = 24.41 V
3 - 4 = 24.39 V
1 - 3 = 28.89 V
3 - 5 = 28.55 V
2 - 4 = 48.62 V
1 - 5 = 57.27 V
6 - 7 = 16.29 V
7 - 8 = 16.33 V
6 - 8 = 32.51 V
D - E = 11.86 V
E - F = 13.25 V
D - F = 12.71 V
Resistance:
A - C = 135.1 ohm
A - B = 123.3 ohm
B - C = 11.9 ohm
1 - 3 = 3.5 ohm
3 - 5 = 3.5 ohm
1 - 5 = 7.1 ohm
6 - 8 = 23 ohm
6 - 7 = 12.3 ohm
D - E = 8.3 ohm
E - F = 0 (???)
D - F = 0 (???)
Thank you in advance!
I took it apart and found that the primary transformer winding breaks (open circuit). Given that the transformer is blank, with no marking whatsoever, looks like the easiest replacement would came from the manufacturer. So the manufacturer sends me out a new transformer for the amplifier for free.
Worry of having the same issue in the future, I decided to measure the new transformer so I can get a replacement myself if it breaks again.
However, I'm stuck on the D-E-F outputs measurements. The resistance on D-F and E-F shows zero?? Yet the voltage seems weird too. Would be glad if someone can enlighten me.
Voltage (AC)
2 - 3 = 24.41 V
3 - 4 = 24.39 V
1 - 3 = 28.89 V
3 - 5 = 28.55 V
2 - 4 = 48.62 V
1 - 5 = 57.27 V
6 - 7 = 16.29 V
7 - 8 = 16.33 V
6 - 8 = 32.51 V
D - E = 11.86 V
E - F = 13.25 V
D - F = 12.71 V
Resistance:
A - C = 135.1 ohm
A - B = 123.3 ohm
B - C = 11.9 ohm
1 - 3 = 3.5 ohm
3 - 5 = 3.5 ohm
1 - 5 = 7.1 ohm
6 - 8 = 23 ohm
6 - 7 = 12.3 ohm
D - E = 8.3 ohm
E - F = 0 (???)
D - F = 0 (???)
Thank you in advance!