NEC 2000 IVS 2

[tomshenryii]

Does anyone have any diagrams of voltage output readings on the PZ-PW121? I believe I have a bad power supply. The phone system works fine but the analog ports get sub par voltage readings. I get 50 volts AC on ringing voltage and 24 volts DC on idle.

 

[belevedere]

Should be 90vac for the analog ringer, and -27vdc/-5vdc for the rest of the system.
If you have the PW-86 power supply then there should be connector labeled GND/FG/-27v. You can trace the plug to the back plane and insert you meter probe into the back of the connector. The RSG connector has 3 wires in it to the back plane. The only way to check it is through the back of the connector.

 

[PFD45]

Twice I've had TDM digital phones power up and die sporadically when the PZ-PW21 tested good with my multi-meter.
Just out of instinct (and nothing else to try) I replaced the power supply and the system began working.