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

Lucien Nunes · 14th Jun 2019, 8:21 pm

I can't tell now whether that is 9V shown at pin 6 of the original frame wiring dwg and as per your measurement, or 0V which seems more sensible and in agreement with the new module.

Anyway, I've done a hasty redraw of the new module. As PJL says there must be a missing connection on your schematic from the regulator to the part of the rail shown connected to the opamp, which I have added.

THERE MAY BE ERRORS (either yours or mine) as I have not checked it and am now out of time to do so. Please compare back with the board itself..

14th Jun 2019, 8:21 pm	#61
Lucien Nunes Rest in Peace Join Date: Apr 2008 Location: London, UK. Posts: 2,508	Re: Bell and Howell TQII 1652 16mm projector I can't tell now whether that is 9V shown at pin 6 of the original frame wiring dwg and as per your measurement, or 0V which seems more sensible and in agreement with the new module. Anyway, I've done a hasty redraw of the new module. As PJL says there must be a missing connection on your schematic from the regulator to the part of the rail shown connected to the opamp, which I have added. THERE MAY BE ERRORS (either yours or mine) as I have not checked it and am now out of time to do so. Please compare back with the board itself.. Attached Thumbnails