R615 (33 ohms) is the black tubular wirewound resistor and R614 (6.8Kohms) is the white component in the foreground. Both have been removed and test OK.
I cannot locate the elusive ("schwer fassbar" in German - I think!) C616 - the 200uF electrolytic. If anybody knows where it is located on this chassis, I would be most grateful!
Otherwise - and this is my next step - I will have to unsolder the relay unit and clean and lubricate it.
But - I don't think the relay is receiving any power when the S/M button is pressed. I have cleaned the contact on the button itself.
Any more ideas please??
Bryan
OK - ich habe die S / M-Relais gelegen - hier ist es:
R615 (33 Ohm) ist der schwarze röhrenförmigen Drahtwiderstand und R614 (6.8Kohms) ist die weiße Komponente in den Vordergrund. Beide wurden entfernt und testen Sie auf OK.
Ich kann nicht finden die scheuen ("schwer fassbar" auf Deutsch - glaube ich) C616 - die 200uF Elektrolytkondensator. Wenn jemand weiß, wo es auf diesem Chassis befindet, wäre ich sehr dankbar!
Andernfalls - und das ist mein nächster Schritt - ich muss das Relais-Einheit auslöten und reinigen und schmieren.
Aber - ich glaube nicht, dass das Relais mit Strom versorgt, wenn das S / M-Taste gedrückt wird. Ich habe den Kontakt auf der Taste selbst gereinigt.
Jede weitere Ideen bitte?
Bryan
Hi Bryan,
of course there could be some mechanical issues responsible for the relay to fail switching.
Just to rule out an 'electrical' reason please measure the voltages at the two points I marked in the picture, while the M/S button is being pushed.
Achim
Well - no luck, Achim.....
There is no voltage evident between these two points (I'm assuming that's what you mean?) when the S/M button is pressed. I've also tested from the 260V point to the chassis - still nothing.
So - just as well I haven't dismantled the relay, as it appears to be an "electrical" problem?
Bryan
OK - getting there!
Found the 200uF capacitor (difficult to miss, as it's huge!) removed it and wired in another. No improvement. Put the old one back and refitted the S/M relay and - presto! It worked again. So - somewhere there was a dry joint/ poor connection. I doubt if I'll ever find out where!
Meanwhile the ON/OFF relay is still a bit sticky, so I'm going to have another go at that and then clean all the relays/contacts I can (especially the tuning advance mechanism ) as they all look a bit dirty.
The hopefully it will all be OK!
This is a very heavy chassis to move around the workbench and it is easy to cause damage when you do so - so others beware!
