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This is an old cooker, probably about 1990 but is still worth repairing if possible.
The power relay on the small PCB (EC133B , 13-670L) has suddenly started to emit quite a loud vibrating noise. This occurs whenever power is applied by the rotating controls to any of the heaters eg ovens or grill. As it appeared to be a problem common to power application, as a first possibility I replaced the power relay LZ 24S.
Sadly, still noisy.
I have the problem that I cannot get a circuit diagram or block schematic for such an old cooker so diagnosis is difficult.Has anybody thoughts on what could be the problem?There’s more or less no info on it now, no wiring but you’d never have gotten the board schematics in any event.
K.
Oldrepairer wrote:This is an old cooker, probably about 1990 but is still worth repairing if possible.
The power relay on the small PCB (EC133B , 13-670L) has suddenly started to emit quite a loud vibrating noise. This occurs whenever power is applied by the rotating controls to any of the heaters eg ovens or grill. As it appeared to be a problem common to power application, as a first possibility I replaced the power relay LZ 24S.
Sadly, still noisy.
I have the problem that I cannot get a circuit diagram or block schematic for such an old cooker so diagnosis is difficult.Has anybody thoughts on what could be the problem?An update.
I managed to obtain a used PCB and replaced the original. Problem solved. Almost certainly the problem was a failing diode on the original PCB. When tested in the positive direction, it conducted for a split second and then went open circuit ( or very high resistance) I can only assume that this was happening repetitively causing the power relay to chatter. – good for another 30 years!Same symptoms here though not being a repairer or electrician I don’t know if they result from the same cause.
Wondering if there are any repairers in the London area who can fix – many parts seem to be available for purchase new but I doubt, if it’s a pcb, that a new one can be found; might need scavenging one or having an electronics repairman fix the existing.you could ask
https://www.qualityelectronicrepairs.co.uk/
dont know this board myself but it may be a simple fix if you can solder
would need to see s clear veiw of the board to see if i can guess which part is the most likely to failDave
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