Denon TU-280 cuts out. - UK Vintage Radio Repair and Restoration Discussion Forum

vitorol · 6th Aug 2020, 12:17 pm

Hi. I recently purchased a Denon TU-280 Tuner. I think the tuner does something that is not normal. When in "auto" mode on a weaker radio station, the sound is cut off frequently for 1 or 2 seconds and then comes back. In stations with a strong signal, this does not happen and if it is in manual mode (mono), neither does it. I searched the net and found a user who has a similar Denon who said it was easy to repair. It was necessary to adjust a test point "TP1". I have no idea how to do this. Can someone help me please? Thank you

percival007 · 7th Aug 2020, 8:18 am

Depeneding upon how 'weak' the Station is when it cuts out, this I think is normal operation.
Older sets used to 'blend' into Mono as the Signal got weaker eliminating the extraneous noises that could ocurr when a Stereo Decoder is presented with a Weak input Signal.
More modern sets, of which yours is tend to just Mute the Output. Pressing the Mono Button forces the set into Mono, obviously and this masks the Noises from a weaker Signal.

Of course if this happens too early, the set could be out of alignment or indeed faulty. But I have to say I doubt it.
Can you try a better Aerial to improve these Weaker Stations reception?

James.

vitorol · 7th Aug 2020, 9:16 am

I will buy a better antenna. I also thought it could be normal but wanted to confirm it before buying the antenna. Yesterday I managed to have 3 radio stations with more signal and the cuts were no longer happening. Thank you!

paulsherwin · 7th Aug 2020, 10:10 am

I agree with James, this is normal behaviour for this and many other FM tuners.

6th Aug 2020, 12:17 pm	#1
vitorol Diode Join Date: Aug 2020 Location: Tomar, Portugal. Posts: 2	Denon TU-280 cuts out. Hi. I recently purchased a Denon TU-280 Tuner. I think the tuner does something that is not normal. When in "auto" mode on a weaker radio station, the sound is cut off frequently for 1 or 2 seconds and then comes back. In stations with a strong signal, this does not happen and if it is in manual mode (mono), neither does it. I searched the net and found a user who has a similar Denon who said it was easy to repair. It was necessary to adjust a test point "TP1". I have no idea how to do this. Can someone help me please? Thank you

7th Aug 2020, 8:18 am	#2
percival007 Heptode Join Date: May 2005 Location: Oxfordshire, UK. Posts: 852	Re: Denon TU-280 cuts Depeneding upon how 'weak' the Station is when it cuts out, this I think is normal operation. Older sets used to 'blend' into Mono as the Signal got weaker eliminating the extraneous noises that could ocurr when a Stereo Decoder is presented with a Weak input Signal. More modern sets, of which yours is tend to just Mute the Output. Pressing the Mono Button forces the set into Mono, obviously and this masks the Noises from a weaker Signal. Of course if this happens too early, the set could be out of alignment or indeed faulty. But I have to say I doubt it. Can you try a better Aerial to improve these Weaker Stations reception? James.

7th Aug 2020, 9:16 am	#3
vitorol Diode Join Date: Aug 2020 Location: Tomar, Portugal. Posts: 2	Re: Denon TU-280 cuts I will buy a better antenna. I also thought it could be normal but wanted to confirm it before buying the antenna. Yesterday I managed to have 3 radio stations with more signal and the cuts were no longer happening. Thank you!

7th Aug 2020, 10:10 am	#4
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,932	Re: Denon TU-280 cuts out. I agree with James, this is normal behaviour for this and many other FM tuners.