I have two similar scanners (Radio Shack Pro4004 & Pro2006 mfg by GRE) of similar design that I just discovered both have a 'hot' chassis. Measuring 100vac (no load) to earth ground (grounded roof antenna). It's a non-grounded line cord.
They both have a 'old school' power supply (metal enclosed xformer), not switching that is mounted to the metal chassis. There is a 1.8 meg resistor from the neutral to the chassis. There is no other component between the AC line cord and the xformer.
If I de-solder the resistor, the leakage voltage drops to 9vac. So the question is, is it ok to leave it disconnected? I assume the 1.8 meg resistor is to drain any static charges off the chassis .
The odd thing is I have had one of these for probably 30+ years and never noticed this which I did now by re-connecting the antenna cable and holding a external metal enclosed FM broadcast filter and the antenna cable connector.
They both have a 'old school' power supply (metal enclosed xformer), not switching that is mounted to the metal chassis. There is a 1.8 meg resistor from the neutral to the chassis. There is no other component between the AC line cord and the xformer.
If I de-solder the resistor, the leakage voltage drops to 9vac. So the question is, is it ok to leave it disconnected? I assume the 1.8 meg resistor is to drain any static charges off the chassis .
The odd thing is I have had one of these for probably 30+ years and never noticed this which I did now by re-connecting the antenna cable and holding a external metal enclosed FM broadcast filter and the antenna cable connector.