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TonyDuell · 9th Jun 2019, 5:56 pm

This makes no sense to me, and I have read and re-read the circuit diagram.

Let's start with the basics. You have the meter probes in the right sockets. If in doubt, check a battery or something. The meter should read normally (pointer swinging to the right) on DC volts ranges when the red probe is positive.

Connect the red and white line cord wires so that terminal 4 in the block terminal is the +ve one.

Now check the polarity of the 'local' DC power supply. This goes to terminals 1 and 2 of the Block Terminal. Terminal 2 should be the +ve one.

When sounding the buzzer, check between terminals 4 and 5 of the ringing converter. Terminal 5 should be +ve

9th Jun 2019, 5:56 pm	#35
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: GPO planset with external extensions This makes no sense to me, and I have read and re-read the circuit diagram. Let's start with the basics. You have the meter probes in the right sockets. If in doubt, check a battery or something. The meter should read normally (pointer swinging to the right) on DC volts ranges when the red probe is positive. Connect the red and white line cord wires so that terminal 4 in the block terminal is the +ve one. Now check the polarity of the 'local' DC power supply. This goes to terminals 1 and 2 of the Block Terminal. Terminal 2 should be the +ve one. When sounding the buzzer, check between terminals 4 and 5 of the ringing converter. Terminal 5 should be +ve