Re: Quiet or no dial tone in a GPO 706
OK, you do have the regulator PCB fitted in its socket 'upside down'. That is with the end that connects the 3 middle contacts on the socket with a simple PCB trace in the socket.
Connect one multimeter probe to T19 and leave it there.
Put the other probe on terminal 4 of the ASTIC. Should be 0 ohms or close to it (this checks the gravity switch contact and associated wiring).
Move the probe to terminal 5 of the ASTIC. Should be 22 ohms (this checks the ASTIC winding, even though you've already done so)
Move the probe to that PCB trace on the regulator that I mentioned. Should still be 22 ohms (this checks the wiring from ASTIC pin 5 to the regualtor terminal C).
Move the probe to T3. Should stll be 22 ohms (this checks the wiring from regulator termnal B to T3).
|