UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Roberts RT7

Station X · 29th Apr 2009, 6:55 pm

If C32 is getting hot it is obviously faulty. It is quite likely that this component is pulling the battery voltage down, effectively short circuiting it. Remove it and use the ohms range of your meter to check it. A good cap will initially show a low reading which should rise to near infinity as the capacitor charges. A bad cap will show a continuous low reading. Try the meter both ways as the actual polarity of the leads when switched to ohms may vary.

This is not a foolprooof test, as the test voltage will be low and may not "break down" the fault. You could try connecting the capacitor across the battery with you meter set to mA in series. The current should be very low.

Judging by your test results there are other faults, but this is an obvious one to start with.

29th Apr 2009, 6:55 pm	#68
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Roberts RT7 - problem If C32 is getting hot it is obviously faulty. It is quite likely that this component is pulling the battery voltage down, effectively short circuiting it. Remove it and use the ohms range of your meter to check it. A good cap will initially show a low reading which should rise to near infinity as the capacitor charges. A bad cap will show a continuous low reading. Try the meter both ways as the actual polarity of the leads when switched to ohms may vary. This is not a foolprooof test, as the test voltage will be low and may not "break down" the fault. You could try connecting the capacitor across the battery with you meter set to mA in series. The current should be very low. Judging by your test results there are other faults, but this is an obvious one to start with. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.