Beogram 8002 stops short

19 replies
AN
Offline
antlestxp
Bronze
Posted October 4, 2022 at 00:10 GMT
#1649499
link
Sorry, I didn’t read the previous threads closely. It sounds like you have set the steady-state levels on the scanning buttons where the LDRs measure 620 mV. I would connect an oscilloscope to the sensor signals and see if any are showing any signs of problems. Here are the sensor measurements I captured on a Beogram 8002 a little more than a year ago. The oscilloscope measurements are towards the end of the post. There are also photos of where the test probe wires are soldered to. -sonavor
Thanks for pointing me in the right direction. Looks like you probe at r11 and r8 for the 2 receiver diodes. Do you know what part number the receiver diodes are if they are the problem.
SO
Offline
sonavor
Bronze
Posted October 4, 2022 at 02:40 GMT
#1649500
If you used something like an OP240 or OP245 IR Emitter then their corresponding phototransistors are OP550 or OP 560 for the OP240 and OP555 or OP565 for the OP245.

The IR Emitters have been hard to get for a while but fortunately you already have that component.

Before changing any of these components I would measure the existing signals and make sure the part is where the fault is.

-sonavor
AN
Offline
antlestxp
Bronze
Posted October 4, 2022 at 04:08 GMT
#1649501
Very helpful. Your posts got me through a 4002 restoration! I used a camera to determine the emitter was faulty.
SO
Offline
sonavor
Bronze
Posted October 4, 2022 at 17:14 GMT
#1649532
Great. You meant to write that you got through your BG8002 restoration, right?

Congratulations and good work.

-sonavor

 
AN
Offline
antlestxp
Bronze
Posted October 5, 2022 at 03:57 GMT
#1649551
No I'm still working on this one. I meant I got a 4002 running from your blog a while ago.
SO
Offline
sonavor
Bronze
Posted October 5, 2022 at 14:03 GMT
#1649560
Oh, that's fantastic.  We're always glad to hear that it provided some help.

-sonavor
AN
Offline
antlestxp
Bronze
Posted October 6, 2022 at 05:01 GMT
Edited October 6, 2022 at 05:03 GMT
#1649573
Got it up and running. Circled back to the basics. Checked my solder work. Pulled as much as the old solder my vacuum could. All new solder. Cleaned and checked all mechanicals. Then checked my work and calibration of the control panel. It was the control panel. My adjustment was close but not close enough. Had the relocate the new receivers into a better position then readjust with the screws. Soldered a connector to the panel I could leave measuring equipment to made quick work of it. Now I just need to finish up the rest of the adjustments to the tone arm.

 

Thanks again. This is my 4th and probably final beo. RX2 TX2 4002 and now this 8002. Every table I have wanted over the years.

 

https://imgur.com/a/GfCSTt1
chartz
Offline
chartz
Bronze
Posted October 6, 2022 at 05:29 GMT
#1649574
Good job. Little things, always ☺️
Jacques
beogram8002
Offline
beogram8002
Bronze
Posted October 14, 2022 at 16:42 GMT
#1649723
well done, that is great news, another 8002 playing vinyl again :-)

Location: London UK

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