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Leich PBX L55 - will not ring out to a phone with a real bell.

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swreed68@gmail.com:
Hello,

I am new to the group and would like to ask for some help on an issue I am having.

I have an Leich L55 10 cord board and I am running a Western Electric power unit SD-81824-01

I noticed that if I try to ring an extension where there is a telephone with an electronic ringer it will ring, but trying to ring a set with a real bell it will not.

I then checked at the jack with nothing plugged in and I have 120 VAC, but if a phone is plugged in it drops to about 25 VAC and doesn't ring the bell.  I have tried various sets with a real bell and they all behave the same.

The same behaviour is present on all ten cord sets.

If I measure ringing voltage at terminal 14 (which is the common ring feed to all cord sets) it does not drop off when ringing a phone with a real bell.  It looks identically solid at 120 VAC when ringing either an electronic ringer or a real bell.

Any ideals?  I have no other issues with the PBX but this.


Thanks in advance!


Sean Reed

RB:
Hi Sean.
Welcome.
I do not know much about your board, but would like to ask a couple questions, and maybe suggest something.
First, does your board have a hand ringer?
It comes AFTER the bulb.
Have you tried ringing a bell that way?
What happened?
Next, there really isn't a lot to that circuit.
I suspect someone has possibly installed a lite bulb in the gen circuit that is incorrect for that board.
You mentioned, ringing an electronic bell works?
That will not require as much current as a coil bell.
You also mentioned, that measuring the voltage BEFORE the circuit, produces proper output from power supply,
And measuring AFTER the bulb, power drops drastically?
That also could happen, if a too large bulb was installed.
Maybe try bypassing the bulb for a quick test?
The last think I can think of, is possibly burned or very dirty contacts on the RING button???
Try cleaning the contacts, that may help???

5415551212:
Sounds like a interesting setup.
Post some photos if you can.

swreed68@gmail.com:

--- Quote from: RB on October 16, 2021, 03:27:09 AM ---Hi Sean.
Welcome.
I do not know much about your board, but would like to ask a couple questions, and maybe suggest something.
First, does your board have a hand ringer?
It comes AFTER the bulb.
Have you tried ringing a bell that way?
What happened?
Next, there really isn't a lot to that circuit.
I suspect someone has possibly installed a lite bulb in the gen circuit that is incorrect for that board.
You mentioned, ringing an electronic bell works?
That will not require as much current as a coil bell.
You also mentioned, that measuring the voltage BEFORE the circuit, produces proper output from power supply,
And measuring AFTER the bulb, power drops drastically?
That also could happen, if a too large bulb was installed.
Maybe try bypassing the bulb for a quick test?
The last think I can think of, is possibly burned or very dirty contacts on the RING button???
Try cleaning the contacts, that may help???

--- End quote ---


Thanks for the reply.  It doesn’t have a hand crank gen.

Voltage stays the same both sides of the bulb, and bypassing the bulb still gives no ring.

The drop is on cord - and all ten cord sets behave the same.

RB:
I guess I am confused about this statement...

"I then checked at the jack with nothing plugged in and I have 120 VAC, but if a phone is plugged in it drops to about 25 VAC and doesn't ring the bell.  I have tried various sets with a real bell and they all behave the same."

What exactly are you referring to as the "jack"???
There should not be more than the TALK voltage on the jack, 24 or 48 volts, "with the phone on the hook". until a cord is plugged into the jack for that extension, and the RING button is pressed.
Could you post a couple pics of your board, and your procedure?
Regards

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