Car stereo Blaupunkt Woodstock SQR88 blown something on installation - UK Vintage Radio Repair and Restoration Discussion Forum

Dan_911sc · 11th Apr 2021, 8:15 pm

Hi all

I was hoping someone could help me, I recently bought a mint Blaupunkt Woodstock/Memphis SQR88 (shipped from Lithuania to the UK which took almost 4 weeks) and after it was working perfectly fine for a few minutes I have stupidly blown something.

When testing the auto aerial function, the accessory switched live cable (which I stupidly had exposed) touched the body/case of the radio so shorted out to ground and now nothing displays apart from backlight. Is there a specific internal component that may have blown from this sort of contact? Or have I damaged something more significant? I’ve managed to find and print off a full circuit diagram but

if I know what it all means

I’m praying it’s an easy fix - Please help!!!

Thanks
Dan

Leon Crampin · 11th Apr 2021, 10:44 pm

Post an extract from the circuit, covering power in, switching and power out. There might be a supply fuse fitted to this radio which will have blown.

Leon.

ortek_service · 11th Apr 2021, 10:53 pm

Yes, there's usually a 20mm glass fuse fitted in the back of these, where the power connectors plug in. And this will probably be on the main (Ignition Key= Accessory position) switched supply. So it may only have the backup supply present, which it may power the illumination from.

majoconz · 12th Apr 2021, 12:18 am

IMHO the backlight may be driven from the car panel lighting circuit.

11th Apr 2021, 8:15 pm	#1
Dan_911sc Diode Join Date: Apr 2021 Location: Woodbridge, Suffolk, UK. Posts: 1	Car stereo Blaupunkt Woodstock SQR88 blown something on installation Hi all I was hoping someone could help me, I recently bought a mint Blaupunkt Woodstock/Memphis SQR88 (shipped from Lithuania to the UK which took almost 4 weeks) and after it was working perfectly fine for a few minutes I have stupidly blown something. When testing the auto aerial function, the accessory switched live cable (which I stupidly had exposed) touched the body/case of the radio so shorted out to ground and now nothing displays apart from backlight. Is there a specific internal component that may have blown from this sort of contact? Or have I damaged something more significant? I’ve managed to find and print off a full circuit diagram but if I know what it all means I’m praying it’s an easy fix - Please help!!! Thanks Dan

11th Apr 2021, 10:44 pm	#2
Leon Crampin Octode Join Date: Nov 2005 Location: Surrey, UK. Posts: 1,870	Re: Car stereo Blaupunkt Woodstock SQR88 blown something on installation Post an extract from the circuit, covering power in, switching and power out. There might be a supply fuse fitted to this radio which will have blown. Leon.

11th Apr 2021, 10:53 pm	#3
ortek_service Octode Join Date: May 2018 Location: Northampton, Northamptonshire, UK. Posts: 1,440	Re: Car stereo Blaupunkt Woodstock SQR88 blown something on installation Yes, there's usually a 20mm glass fuse fitted in the back of these, where the power connectors plug in. And this will probably be on the main (Ignition Key= Accessory position) switched supply. So it may only have the backup supply present, which it may power the illumination from.

12th Apr 2021, 12:18 am	#4
majoconz Heptode Join Date: Jan 2008 Location: Ashhurst, Manawatu, New Zealand Posts: 570	Re: Car stereo Blaupunkt Woodstock SQR88 blown something on installation IMHO the backlight may be driven from the car panel lighting circuit. __________________ Cheers - Martin ZL2MC