Stabo 933/934 prs cb.
#21

Hello Henning, yes you are correct.

Ok, capacitors arrived very fast indeed so the first order of business was to release the suspect component from the board. Quite fiddly as its a through hole component but double sided with those little "vias" that join each side.
Using a very small tip and a desolder pump (not ideal, I need a proper desoldering station) I released it.
A quick check with the multimeter showed it was shorted.
I actually took it apart and after unwinding about 4 turns the short disappeared.
The new component went it easily and was soldered in position.
After clipping the front panel back on and checking nothing was amiss, like trapped wires etc, I held my breath as the power went on.
Neednt have worried, I had a fully operational display and best of all no smoke! Smile
Ive had a closer look at the diagram since and found another electrolytic thats even more critical than the failed item.
Its located on the 13.8volt feed directly from the switch and is again connected between the ground and power line, so if that ever shorts out its possibly going to destroy part of the pcb and let out lots of expensive magic smoke, so that capacitor will get changed along with all the others before I dare apply power again.
Heres a couple of pictures inside the radio, I didnt get a chance to assemble the antenna today unfortunately.

[Bild: MlyOftP.jpg]

[Bild: OlB0eY4.jpg]

[Bild: wxcfbMW.jpg]


The diagram shows the capacitor that failed on the left arrow, followed by the choke that heated up, then over on the right the voltage regulator and finally the capacitor thats connected to 13.8volts that might do some nasty damage if it ever goes the same way as the other one.

[Bild: C6s1klj.jpg]

Failed item.

[Bild: zLSN1kA.jpg]

Replaced item.

[Bild: mn2BJRD.jpg]

And it works!

[Bild: oiMZx0a.jpg]
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Stabo 933/934 prs cb. - von - 08.12.2019, 15:44
RE: Stabo 933/934 prs cb. - von - 08.12.2019, 16:14
RE: Stabo 933/934 prs cb. - von FreeSWLStation - 08.12.2019, 16:48
RE: Stabo 933/934 prs cb. - von - 08.12.2019, 18:58
RE: Stabo 933/934 prs cb. - von - 08.12.2019, 20:19
RE: Stabo 933/934 prs cb. - von - 08.12.2019, 21:41
RE: Stabo 933/934 prs cb. - von - 09.12.2019, 09:55
RE: Stabo 933/934 prs cb. - von - 09.12.2019, 11:54
RE: Stabo 933/934 prs cb. - von FreeSWLStation - 09.12.2019, 13:18
RE: Stabo 933/934 prs cb. - von - 09.12.2019, 14:23
RE: Stabo 933/934 prs cb. - von FreeSWLStation - 09.12.2019, 17:15
RE: Stabo 933/934 prs cb. - von - 11.12.2019, 20:16
RE: Stabo 933/934 prs cb. - von - 12.12.2019, 19:19
RE: Stabo 933/934 prs cb. - von - 14.12.2019, 10:22
RE: Stabo 933/934 prs cb. - von - 14.12.2019, 20:47
RE: Stabo 933/934 prs cb. - von FreeSWLStation - 14.12.2019, 21:48
RE: Stabo 933/934 prs cb. - von - 15.12.2019, 15:23
RE: Stabo 933/934 prs cb. - von FreeSWLStation - 15.12.2019, 18:02
RE: Stabo 933/934 prs cb. - von - 20.12.2019, 19:35
RE: Stabo 933/934 prs cb. - von - 22.12.2019, 11:55
RE: Stabo 933/934 prs cb. - von - 22.12.2019, 19:43
RE: Stabo 933/934 prs cb. - von - 12.02.2020, 19:59
RE: Stabo 933/934 prs cb. - von - 13.02.2020, 07:55
RE: Stabo 933/934 prs cb. - von - 16.02.2020, 20:06
RE: Stabo 933/934 prs cb. - von - 06.03.2020, 15:19
RE: Stabo 933/934 prs cb. - von - 07.03.2020, 10:30

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