6 replies to this topic

[red-14.com]

Hi Guys,

One of the fuses one the power unit keeps blowing as soon as i put a new one in. I think it is for the lights as its the only thing on the machine that doesn't work.

Any ideas guys?

[jimmydeath]

Hello

the fuse blowing would indicate an overload from the lighting circuit, I assume that you are replacing the fuse with the correct type (antisurge if mine is anything to go by)

The possibilities are a short in the wiring loom or in one of the bulbs , I have seen this in house lighting where a bulb failure has taken out the main circuit breaker.

Thinking of ways to isolate the fault, 1) you could remove all the bulbs and replace them in small batches until the fault is found, 2) If you have access to a bench PSU with current limiting you could power up the lighting circuit using this and look for dead bulbs or those brighter than the others. 3) taking a leaf from TV repair (and assuming the circuit is circa 12volts) you could put a car headlight bulb in series with the circuit to limit the current which also may allow you to identify faults.

If the fault is in the loom rather than a bulb then you may well have to break into (e.g. cut)it in several places to narrow down the location if a visual inspection doesn't solve it.

Hope this is of help

Good luck

[impact]

Hi red-14.com what machine is it

[red-14.com]

Thanks jimmy, that seems like a lot of work but it may take it. I noticed that there was a loose earth wire. When i connected it to the correct bolt and replaced the fuse, it took slightly longer to blow, a couple of seconds instead of immediately. I'm using fuses from another machine. What is the highest resistance fuse you think i could use?

[red-14.com]

Hi, I'm sorry, i really can't remember and it is far to cold to go outside to the garage now. I'll check tomorrow and let you know. I think it is a jpm machine or at least very similar.

[impact]

impact machine then housed in an electra or vogue cabnet. Psu str8 away will tell you that now

[jimmydeath]

Hello again.

I take it that there is no fuse rating written next to the fuseholder?

Do you have the original fuse, you can get the amperage from that otherwise not knowing the machine I couldn't guess at how much current it takes.

regards

James