BT Freeway 1980s cordless phone - UK Vintage Radio Repair and Restoration Discussion Forum

stuart_morgan_64 · 20th Jun 2015, 6:43 pm

Has anyone a circuit or experience repairing these. Thanks

stuart_morgan_64 · 22nd Jun 2015, 4:54 pm

Now found out they were made by Uniden

AndiiT · 22nd Jun 2015, 9:00 pm

Hi, It's very unlikely that you will find a circuit for one of these (or any telephone produced much after the GPO 8746 etc.) as the circuit information was protected by most manufactures to a higher level than the Crown Jewels

What is the nature of the fault with your phone?, there may be someone in the forum who has experienced similar symptoms.

Regards

Andrew

McMurdo · 22nd Jun 2015, 10:41 pm

I've repaired quite a few of these. Apart from the obvious, like faulty batteries or lightning damaged base stations, by far the most common fault was the main IC in the handset. This could be responsible for no ring tone in, no dial tone out, no dialling pulses, incorrect or random dialling and no doubt more I've not seen. As AndiIT has said they were made by Uniden and the main IC will say that on there too. I used to get the ICs from Intertan in the West Midlands....but that was nearly 20 years ago

stuart_morgan_64 · 23rd Jun 2015, 9:41 am

Hya thanks for the help. I have repaired a few back in the day! The problem is what sounds like a tone. Similar to the paging tone, but higher. You can hear it on the handset, however if you turn the base off the tone goes.

I have narrowed it down to coming from one transistor, which I have replaced, its only on one junction, and is getting in via the audio which would be from the base phone connection. I use a telephone exchange simulator, which when plugged in the tone volume drops, maybe some sort of loading from the simulator.

Its works well, dial out, ringing ect, just this annoying tone.

Any help, even spotting the obvious would be most helpful.

Thanks

20th Jun 2015, 6:43 pm	#1
stuart_morgan_64 Heptode Join Date: Aug 2004 Location: Woodbridge, Suffolk, UK. Posts: 501	BT Freeway 1980s cordless phone Has anyone a circuit or experience repairing these. Thanks

22nd Jun 2015, 4:54 pm	#2
stuart_morgan_64 Heptode Join Date: Aug 2004 Location: Woodbridge, Suffolk, UK. Posts: 501	Re: BT Freeway 1980s cordless phone Now found out they were made by Uniden

22nd Jun 2015, 9:00 pm	#3
AndiiT Octode Join Date: Aug 2005 Location: Saltburn-East, Cleveland, UK. Posts: 1,786	Re: BT Freeway 1980s cordless phone Hi, It's very unlikely that you will find a circuit for one of these (or any telephone produced much after the GPO 8746 etc.) as the circuit information was protected by most manufactures to a higher level than the Crown Jewels What is the nature of the fault with your phone?, there may be someone in the forum who has experienced similar symptoms. Regards Andrew

22nd Jun 2015, 10:41 pm	#4
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,273	Re: BT Freeway 1980s cordless phone I've repaired quite a few of these. Apart from the obvious, like faulty batteries or lightning damaged base stations, by far the most common fault was the main IC in the handset. This could be responsible for no ring tone in, no dial tone out, no dialling pulses, incorrect or random dialling and no doubt more I've not seen. As AndiIT has said they were made by Uniden and the main IC will say that on there too. I used to get the ICs from Intertan in the West Midlands....but that was nearly 20 years ago __________________ Kevin

23rd Jun 2015, 9:41 am	#5
stuart_morgan_64 Heptode Join Date: Aug 2004 Location: Woodbridge, Suffolk, UK. Posts: 501	Re: BT Freeway 1980s cordless phone Hya thanks for the help. I have repaired a few back in the day! The problem is what sounds like a tone. Similar to the paging tone, but higher. You can hear it on the handset, however if you turn the base off the tone goes. I have narrowed it down to coming from one transistor, which I have replaced, its only on one junction, and is getting in via the audio which would be from the base phone connection. I use a telephone exchange simulator, which when plugged in the tone volume drops, maybe some sort of loading from the simulator. Its works well, dial out, ringing ect, just this annoying tone. Any help, even spotting the obvious would be most helpful. Thanks