UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Telephony and Telecomms

Notices

Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment

Closed Thread
 
Thread Tools
Old 20th Oct 2012, 9:59 pm   #1
whereistom
Triode
 
Join Date: Feb 2010
Location: Manchester
Posts: 25
Default 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
Click image for larger version

Name:	photo 1.jpg
Views:	107
Size:	87.2 KB
ID:	71695   Click image for larger version

Name:	photo 2.jpg
Views:	109
Size:	87.4 KB
ID:	71696   Click image for larger version

Name:	photo.jpg
Views:	113
Size:	57.7 KB
ID:	71697  
whereistom is offline  
Old 20th Oct 2012, 10:10 pm   #2
Station X
Moderator
 
Station X's Avatar
 
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 16,159
Default 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

Keep the soldering iron hot.
Station X is online now  
Old 21st Oct 2012, 10:12 am   #3
whereistom
Triode
 
Join Date: Feb 2010
Location: Manchester
Posts: 25
Default 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.
whereistom is offline  
Old 22nd Oct 2012, 1:02 am   #4
jjwayle
Tetrode
 
Join Date: Jun 2009
Location: Bromley, London, UK.
Posts: 58
Default 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.
jjwayle is offline  
Old 25th Oct 2012, 7:42 am   #5
whereistom
Triode
 
Join Date: Feb 2010
Location: Manchester
Posts: 25
Default 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 .
whereistom is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 3:10 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Copyright ©2002 - 2020, Paul Stenning.