UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

dbrb222 · 16th May 2016, 10:52 pm

Hello

I have a GPO 746 phone that I am converting

All seems fine, but I am curious about a second micro-switch and button, in addition to the normal microswitch on the hang-up mechanism:

The second microswitch is wired to the on-hook mechanism on the far side from the "normal" spring-loaded switch

The push button on the top (type 5A) is wired in parallel with this second switch

Both are wired into T11 (brown) T12 (blue) and T13 (grey) on the PCB

As I understood it though, these terminals are spare...

So does that mean these two switches do not actually have any function as things stand?

16th May 2016, 10:52 pm	#1
dbrb222 Retired Dormant Member Join Date: May 2016 Location: London, UK. Posts: 6	GPO 746 second microswitch and button Hello I have a GPO 746 phone that I am converting All seems fine, but I am curious about a second micro-switch and button, in addition to the normal microswitch on the hang-up mechanism: The second microswitch is wired to the on-hook mechanism on the far side from the "normal" spring-loaded switch The push button on the top (type 5A) is wired in parallel with this second switch Both are wired into T11 (brown) T12 (blue) and T13 (grey) on the PCB As I understood it though, these terminals are spare... So does that mean these two switches do not actually have any function as things stand?