2D light fault

[Andy™]

had a look at a 28W 2D light earlier that was not working. customer has already put new lamp & starter in but still nothing (packaging & old are still next to light, so there not just saying it).

take cover off, stick volt tester on incoming L&N. 240v. light then comes on. not what i was expecting. turn the light off then back on. nothing. stick tester on and it lights.... all connections are sound.... just cant work out why it suddently worked when i tested voltage?

 

[steptoe]

4 pin or 2 pin?

what wattage are the fittings?

and what wattage lamps are they using?

none of these things are interchangeable but they all fit each other.

 

[Andy™]

28W 4 pin. lamp was correct for fitting, and so was starter. just cant figure out why it sprang into life when i tested the voltage at terminals. then failed to start, until voltage tested again

 

[steptoe]

why do we have a starter on a 4pin lamp?

they dont usually require an external starter. (is it an old fitting?)

does the fitting state its a 4pin lamp, or are you going by the fact there are 4 pinholes.?

 

[Andy™]

4 pin 2D requires external starter.... existing lamp was also 4pin and worked. until it stopped working

 

[steptoe]

no idea then ,

any that I have come across like that have usually been what I would call cross contaminated.

sorry.

 

[SLIPSHOD & SLAPDASH]

Sounds like a bad connection in the connector, on the load side & when you pushed the tester in it made. Are one or both sides of the connector the push in type ? Did you test the voltage at any other point in the fitting ?

 

[Andy™]

connection on both sides are screw terminals. all connections good. checked connections to choke & holder and they seemed fine. didnt check voltage at another point. just L-N (then L-E & N-E).

 

[NozSpark]

IIRC I've had this kind of fault on a ballast before,,,

one of the joints inside it was broken (open circuit) near the terminal block... when you probe it you push the joint back together