UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Hameg HM307-3 Cleaning and Repair

WaveyDipole · 27th May 2019, 8:52 am

Does it glow or flicker at any point during power up or switch off? What's the position of the Trigg. Ext and Hor. Ext buttons? Ensure that both in the off position, although with Hor. Ext depressed you should still be getting a dot. Also have the trigger level control set full left to AT (auto trigger) to ensure a free running trace.

BTW, what's the status of the Y-amp? I ask because if those plate voltages are way off then the trace might be off the bottom or top of the CRT display. If the Y-Pos adjustment doesn't help, try depressing the GD button to ground couple the input, or disconnect at EY1 and EY2 again.

27th May 2019, 8:52 am	#32
WaveyDipole Nonode Join Date: Mar 2013 Location: Leicester, UK Posts: 2,535	Re: Hameg HM307-3 Cleaning and Repair Does it glow or flicker at any point during power up or switch off? What's the position of the Trigg. Ext and Hor. Ext buttons? Ensure that both in the off position, although with Hor. Ext depressed you should still be getting a dot. Also have the trigger level control set full left to AT (auto trigger) to ensure a free running trace. BTW, what's the status of the Y-amp? I ask because if those plate voltages are way off then the trace might be off the bottom or top of the CRT display. If the Y-Pos adjustment doesn't help, try depressing the GD button to ground couple the input, or disconnect at EY1 and EY2 again. Last edited by WaveyDipole; 27th May 2019 at 9:06 am.