ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Afternoon All. Let me humbly submit my first post to this forum. I acquired a nice cosmetically clean Beocord 8000. I can at times power it up, and see a brief flash of the full digits display. Then essentially nothing.
I have Beocord 8004 HX and my first question is the boards look similar as does the cassette drive assembly.Would much of a pin pin comparison be viable to start to identify the issues? The 8004 works fine with the usual VU meter item etc. I have the schematics but like to seek wisdom when possible. Obviously the members here enjoy/love the product line.
I do repair a lot of vintage Harmon Kardon etc. But as noted before the B&O is different. Not certainly in a negative way, just a new approach I need to become familiar with. The assembly is so classically overbuilt much like my three Volvo's in the driveway.
A couple of items.
1) both fuses are good
2) Supply voltages seem to compare at the power supply
3) I retouched the solder joints to the display and anything suspicious on the CPU board just enough to flash the solder over and reseat the pins. This was including the logic chips and CPU.
4) I did once over of the cassette assembly and tried it in the 8004 in which it works fine - less FFWD and the recommended belts and parts are ordered to take a look inside and replace the rubber pieces as well as walk through the other recommended common issues.Maybe there is a difference but the similarity made it worth a shot in the dark test.
5) when the display flashes it goes out so quickly like a heat related or possibly voltage drop issue that flares as the current flows
6) I have a single colon dot and sometimes two colon dots
7) Once I was able to have the display and the tape head engaged for a split second - I am aware of how the system works when it has no motion feedback due to belt or motor issues. The 8004 started with that a I bored the belts and it corrected that kick in out behavior. Yes it was a gummy belt mess to clean up.
8) If it never flashed I would hang it up, I want to rule out the obvious to more experienced folks before I start deeper analysis.
Thoughts?