getting replacement phone ringer - Page 1
Forum section: electronics / general

author: Simon
author_rank: Unknown
timestamp: January 14, 2011, 08:09:26 pm
content: I've got a "spirit of st. louise" "Field phone MK1" and the ringer bell in it does not work, are these fiaxable ? or is there any chance of getting another similar part ? there is plenty of room in the box for a different design bell

author: Mechatrommer
author_rank: Super Contributor
timestamp: January 15, 2011, 12:19:51 am
content: picture?

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: January 15, 2011, 03:32:07 am
content: Yeah, a photo would help.Also, how do you know that it doesn't work?

author: williefleete
author_rank: Regular Contributor
timestamp: January 15, 2011, 06:37:25 am
content: the ringer circuit in most phones are relativity simple, a 470nF capacitor and a 1kohm or higher ringer load directly on the phone line will workdepending on what went wrong you'll need to measure the bell coil(s), it should be about 1k total and 500ohms per coil, if that measures fine test the 470nF cap, if its open or measures low capacitance you can replace that also make sure the hammer moves freely and strikes both bellsif one of the coils are open, depending on where it went open you can repair that just peel back the cover and find the winding wire where it broke and extend it or unwind it a few times and put it back on the solder point

author: Simon
author_rank: Unknown
timestamp: January 15, 2011, 06:44:59 am
content: Quote from: JohnS_AZ on January 15, 2011, 03:32:07 amWell it worked last I used but now that I've put it back on it won't ring, I opened it up and put the meter over it and is was open circuit, then I rang the phone from my mobile and measured the AC voltage while it "rang" there was voltage but no ringing. So that's two nails in it's coffin, must be the bell. it's a small single bell.I'll put a pic up later, if anyone remembers my former avatar that was it

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: January 15, 2011, 01:53:03 pm
content: There is an possibility that if you rework the connection between the coil ends , and the contacts of the bell, to be able to work again.But what matters is the picture of the bell it self .General pictures of the device can be found on Google.

author: Simon
author_rank: Unknown
timestamp: January 15, 2011, 07:33:59 pm
content: well for now I will take the easy solution and get an external ringer thing,the part I need to replace/repair consists of a bell with the coil with the hammer rod in it inside the bell so it is a very compact unit. as you say it is probably the wire come off the end but not having another phone I've ordered the external ringer and that will be that until i fix it if i bother now

author: GeoffS
author_rank: Unknown
timestamp: January 16, 2011, 12:04:40 am
content: You might be able to pick up areplacement phonefor the price of a bell!

author: Simon
author_rank: Unknown
timestamp: January 16, 2011, 12:30:46 pm
content: true, really I'd like to have it working, the external bell was £5.5 so a cheap fast solution. I've taken the bell off and will have a look at it, really I'd like to restore this unit as they don't make these phones anymore, yea mine may well go for something one day, when I boght it for £1.5 off a car boot sale it was listed for 100ish$ on the net, maybe I should have sold it then

author: PetrosA
author_rank: Frequent Contributor
timestamp: January 16, 2011, 06:37:07 pm
content: Can you post pics of the original ringer? I have a connection for phone parts and may be able to find something. Include a ruler or dimensions if possible

author: Simon
author_rank: Unknown
timestamp: January 16, 2011, 06:47:22 pm
content: ok pictures attached. the bell is 38mm in diameter

author: PetrosA
author_rank: Frequent Contributor
timestamp: January 16, 2011, 06:53:58 pm
content: Ok, I'll see what I can find.

author: Simon
author_rank: Unknown
timestamp: January 16, 2011, 07:05:50 pm
content: Thank you most kind of you to offer your help