Re: Damaged system of the VU indicator in the JVC KD-A11 tape recorder Request for re
I don't have an isolation transformer for the oscilloscope. That's why I asked for a hint how to connect the probe and gnd. I don't know if I measured correctly.
I assume that the VU meter in the right channel is working properly
0.2V/DIV
0.1ms/DIV
probe for C244
I got 150mV?
Way too much on the left channel.
1V/DIV
0.1ms/DIV
probe for C144
I'll remove the UPC4557 from the pcb and measure the resistance without the circuit.
I don't have an isolation transformer for the oscilloscope. That's why I asked for a hint how to connect the probe and gnd. I don't know if I measured correctly.
I assume that the VU meter in the right channel is working properly
0.2V/DIV
0.1ms/DIV
probe for C244
I got 150mV?
Way too much on the left channel.
1V/DIV
0.1ms/DIV
probe for C144
I'll remove the UPC4557 from the pcb and measure the resistance without the circuit.
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