NV-370 Problem - UK Vintage Radio Repair and Restoration Discussion Forum

Steve_P · 17th Mar 2008, 10:44 pm

It won't 'Switch on'. Well sometimes it does for a second if it's been unpugged for a while. Otherwise, the switch on the front does nowt except switch on an orange light if the timer button is pressed.

Any ideas folks?
What should the volts to earth of the power supply be?

Cheers,

Steve P.

Sideband · 17th Mar 2008, 11:23 pm

I seem to remember that there were some very low value resistors that could cause this problem (0.1 ohm or so). Check in the power supply. They are used for current monitoring. Can't remember exact details now as it was sooooo long ago...!

Rich.

Nickthedentist · 17th Mar 2008, 11:49 pm

Yes, agree with Richard, a big R on the vertical board at the back.

I had one where the replacement never lasted very long, never found out why.

Nick.

Nickthedentist · 17th Mar 2008, 11:50 pm

My book says R1101 (or 1001

), 39R fusible.

tsgunnell · 18th Mar 2008, 1:24 am

I think it's a safety resistor in the power supply right hand side

ben · 18th Mar 2008, 2:25 am

Common problem, change the resistor.
Ben.

Heatercathodeshort · 18th Mar 2008, 9:33 am

An old favourite! The idler usually does a strange little 'dance' before it shuts down. Tiny white resistor. J.

17th Mar 2008, 10:44 pm	#1
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	NV-370 Problem It won't 'Switch on'. Well sometimes it does for a second if it's been unpugged for a while. Otherwise, the switch on the front does nowt except switch on an orange light if the timer button is pressed. Any ideas folks? What should the volts to earth of the power supply be? Cheers, Steve P. __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

17th Mar 2008, 11:23 pm	#2
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,578	Re: NV-370 Problem I seem to remember that there were some very low value resistors that could cause this problem (0.1 ohm or so). Check in the power supply. They are used for current monitoring. Can't remember exact details now as it was sooooo long ago...! Rich. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....

17th Mar 2008, 11:49 pm	#3
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,861	Re: NV-370 Problem Yes, agree with Richard, a big R on the vertical board at the back. I had one where the replacement never lasted very long, never found out why. Nick.

17th Mar 2008, 11:50 pm	#4
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,861	Re: NV-370 Problem My book says R1101 (or 1001 ), 39R fusible.

18th Mar 2008, 1:24 am	#5
tsgunnell Retired Dormant Member Join Date: Aug 2005 Location: Edgware, Middlesex, UK. Posts: 92	Re: NV-370 Problem I think it's a safety resistor in the power supply right hand side

18th Mar 2008, 2:25 am	#6
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: NV-370 Problem Common problem, change the resistor. Ben.

18th Mar 2008, 9:33 am	#7
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: NV-370 Problem An old favourite! The idler usually does a strange little 'dance' before it shuts down. Tiny white resistor. J.