UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Blaupunkt CR43 Pre-out

julie_m · 27th May 2019, 10:49 am

You can find a ground connection using a digital multimeter to test for continuity to chassis with the set off; and then probe the other pins for any DC voltages with the set on. Any pins with no DC on them can be searched for signals using an amplifier input, if no oscilloscope is available. Turn the balance control both ways to find out which is left and which is right. If there are four outputs, you will need to use the front/rear control as well.

If it's the type of 8-pin DIN socket that can accept a 5-pin plug, then the greatest probability is the top middle pin (2) is ground, one of the immediately adjacent ones (4 or 5) is the right-hand signal and the next from that (1 or 3) is the left-hand signal, since this is how the semi-standard 5-pin DIN connector was wired (though manufacturers still sometimes disagreed over whether the outputs were supposed to be on 1 and 4 or 3 and 5 .....) If the set has 4 outputs, then probably all the "main five" will be used, with pins 6, 7 and 8 used for switching signals or auxiliary power.

27th May 2019, 10:49 am	#3
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Blaupunkt CR43 Pre-out You can find a ground connection using a digital multimeter to test for continuity to chassis with the set off; and then probe the other pins for any DC voltages with the set on. Any pins with no DC on them can be searched for signals using an amplifier input, if no oscilloscope is available. Turn the balance control both ways to find out which is left and which is right. If there are four outputs, you will need to use the front/rear control as well. If it's the type of 8-pin DIN socket that can accept a 5-pin plug, then the greatest probability is the top middle pin (2) is ground, one of the immediately adjacent ones (4 or 5) is the right-hand signal and the next from that (1 or 3) is the left-hand signal, since this is how the semi-standard 5-pin DIN connector was wired (though manufacturers still sometimes disagreed over whether the outputs were supposed to be on 1 and 4 or 3 and 5 .....) If the set has 4 outputs, then probably all the "main five" will be used, with pins 6, 7 and 8 used for switching signals or auxiliary power. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.