332 - rings but no dial tone. - UK Vintage Radio Repair and Restoration Discussion Forum

whereistom · 20th Oct 2012, 9:59 pm

Hi,

I've tried converting a 332 following the instructions at http://antiquephones.blogspot.co.uk/...telephone.html but without success.

The phone rings but I don't get a dial tone, lifting the receiver doesn't stop it ringing and (obviously, as I don't get a tone) I can't dial out.

I'm pretty sure everything is wired up correctly (see photos). Line cord is:
White - T1
Red - T9
Blue - T11

Note that line cord green is cut rather than connected to a spare terminal - this shouldn't be a problem?

The handset is wired as follows:
White - T4 to handset M
Green - T6 to handset R
Red - T5 to the unmarked terminal in the centre of the handset

There are straps:
T1 to T2
T8 to T9
3.3K resistor T11 to T12 (note this is a strap in the photo - I was testing)

One observation, which I'm not sure is a symptom or not, is that I'm hearing a buzz through the earpiece - even when the phone isn't connected. This doesn't seem right to me.

Station X · 20th Oct 2012, 10:10 pm

Are you really hearing a buzz in the earpiece when the phone is not connected? I can't see how that's possible. Do you mean that you hear a buzz when the phone is on hook?

Your problem is down to a break in the calling loop. You need to check the continuity of it with a meter. Most likely down to dirty or maladjusted switch hook contacts, or possibly the transmitter (mic) is open circuit.

whereistom · 21st Oct 2012, 10:12 am

The phone is not plugged in, hasn't been plugged in since around 9.30pm last night (ie over 12 hours ago), and there is a slight buzz coming from the receiver.

Thanks for the tips. My electronics knowledge is poor, and I will need to learn how to use a meter first! So if I can't find an obvious answer I'll probably have to leave this one for a few weeks now until I get a bit of time.

jjwayle · 22nd Oct 2012, 1:02 am

Your 332 isn't near a TV, cordless telephone or anything with a switched mode power supply? I've had old phones with those older receiver inserts pick up noise in them from the above when not plugged in. Although that's not a problem and unlikey to be the no dial tone prob.

Station X is right, most likely a dirty contact or break in continuity.

whereistom · 25th Oct 2012, 7:42 am

Hi jjwayle - baby monitor! I realised the baby monitor was sitting on a shelf near where I was working on the phone, and I think that's what was causing it. You're right - nothing to do with the general problems, but at least there's no actual ghost on the line

.

20th Oct 2012, 9:59 pm	#1
whereistom Retired Dormant Member Join Date: Feb 2010 Location: Manchester Posts: 25	332 - rings but no dial tone. Hi, I've tried converting a 332 following the instructions at http://antiquephones.blogspot.co.uk/...telephone.html but without success. The phone rings but I don't get a dial tone, lifting the receiver doesn't stop it ringing and (obviously, as I don't get a tone) I can't dial out. I'm pretty sure everything is wired up correctly (see photos). Line cord is: White - T1 Red - T9 Blue - T11 Note that line cord green is cut rather than connected to a spare terminal - this shouldn't be a problem? The handset is wired as follows: White - T4 to handset M Green - T6 to handset R Red - T5 to the unmarked terminal in the centre of the handset There are straps: T1 to T2 T8 to T9 3.3K resistor T11 to T12 (note this is a strap in the photo - I was testing) One observation, which I'm not sure is a symptom or not, is that I'm hearing a buzz through the earpiece - even when the phone isn't connected. This doesn't seem right to me. Attached Thumbnails

20th Oct 2012, 10:10 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: 332 - rings but no dial tone. Are you really hearing a buzz in the earpiece when the phone is not connected? I can't see how that's possible. Do you mean that you hear a buzz when the phone is on hook? Your problem is down to a break in the calling loop. You need to check the continuity of it with a meter. Most likely down to dirty or maladjusted switch hook contacts, or possibly the transmitter (mic) is open circuit. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

21st Oct 2012, 10:12 am	#3
whereistom Retired Dormant Member Join Date: Feb 2010 Location: Manchester Posts: 25	Re: 332 - rings but no dial tone. The phone is not plugged in, hasn't been plugged in since around 9.30pm last night (ie over 12 hours ago), and there is a slight buzz coming from the receiver. Thanks for the tips. My electronics knowledge is poor, and I will need to learn how to use a meter first! So if I can't find an obvious answer I'll probably have to leave this one for a few weeks now until I get a bit of time.

22nd Oct 2012, 1:02 am	#4
jjwayle Tetrode Join Date: Jun 2009 Location: Bromley, London, UK. Posts: 66	Re: 332 - rings but no dial tone. Your 332 isn't near a TV, cordless telephone or anything with a switched mode power supply? I've had old phones with those older receiver inserts pick up noise in them from the above when not plugged in. Although that's not a problem and unlikey to be the no dial tone prob. Station X is right, most likely a dirty contact or break in continuity.

25th Oct 2012, 7:42 am	#5
whereistom Retired Dormant Member Join Date: Feb 2010 Location: Manchester Posts: 25	Re: 332 - rings but no dial tone. Hi jjwayle - baby monitor! I realised the baby monitor was sitting on a shelf near where I was working on the phone, and I think that's what was causing it. You're right - nothing to do with the general problems, but at least there's no actual ghost on the line .