UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Help needed with

3pinplug · 14th Feb 2023, 8:55 pm

Hi Paula
Latest results as follows:-
All at 5v ampl/div

IC25 pins 6,11, I see a square wave, pins 2, 14 i see 12v on scope.

IC24 pins10,12 I see a square wave, pin 11 12v on scope, pin 13 is dead, nothing?

IC25 pin 5 pulsing seen

IC14 pin 7 pulsing seen

Found a dry joint on underside of board IC21 pin 15 but it is just an isolated pad so not sure it affect anything but will redo the joint.

Does the above mean IC24 needs replacing?

Regards

Mark

14th Feb 2023, 8:55 pm	#98
3pinplug Pentode Join Date: Jun 2016 Location: Kent, UK. Posts: 190	Re: Help needed with - Racal Dana 9081 Hi Paula Latest results as follows:- All at 5v ampl/div IC25 pins 6,11, I see a square wave, pins 2, 14 i see 12v on scope. IC24 pins10,12 I see a square wave, pin 11 12v on scope, pin 13 is dead, nothing? IC25 pin 5 pulsing seen IC14 pin 7 pulsing seen Found a dry joint on underside of board IC21 pin 15 but it is just an isolated pad so not sure it affect anything but will redo the joint. Does the above mean IC24 needs replacing? Regards Mark