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Question Lockmaster PSU fault

2 months 5 days ago #41528 by Cookaburra
We have several units showing no output at specific voltage settings but fine at others. It costs such a lot to send these off to Techlab for repair. Can these be fixed in house and if so how? I am a novice at electrics but willing to have a go if it's possible

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2 months 4 days ago #41531 by AndyG
The answer is 'quite probably' but, if you do not have experience of how these things work coupled with electrical fault-finding know-how, I would find it difficult to suggest you even open up such units without a service/technical manual at the very least.
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2 months 4 days ago - 2 months 4 days ago #41532 by SteveKeys
I agree with AndyG here - it will probably be repairable by someone who is confident and competent in electrical repair. If this doesn't sit comfortably with you, which is fine, have you tried either the caretakers or CDT/Electronics areas of expertise, who maybe able to help you out?

Just a few days ago I repaired one of these PSUs and was surprised to see they actually carry a spare carbon wheel inside the unit. This would suggest this part is prone to failure and could be the reason behind the voltage drop out on your unit.

HOWEVER - AND THIS IS THE IMPORTANT BIT

If ANY repair is carried out or even attempted, the unit MUST be PAT tested again before being put back into use.

Steve
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2 months 1 day ago #41542 by bsimmo
do you have a picture of the one you have problems with. At specific voltages seems like the rotary switch is faulty, damaged due to 'sparks' on changing.

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1 month 4 weeks ago #41549 by Cookaburra
This is the power supply I mean - however I have no idea how to get into the workings of the dial. I have taken several screws out and then put them in again! (That is what I seem to do every time I try to mend anything).

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