Hello,Suspecting the arc detector to be bad on the primary cavity I replaced it with a new one from Harris broadcasting. part#378-0180-000 $485.
When I tested it the arc detector fault did not come on so I tested in a black box and it worked when examining the new and the old detector … the old detector has brighter and bigger bulb.
We have a old circuit assembly so the metal is tarnished. The new detector bulb is not bright enough… the old detector bulb was.
The new detector works… put the bulb is not bright enough.
I called Harris tech support at 217-222-8200 and talked to Ray Dearing in Harris field service.
He said he experienced the same problem with old tube assemblies and I discussed the issue with him… the idea being I disassemble tube cavity and clean and polish inside like a mirror then arc detector may or may not work with test bulb. It seems like the bulb was changed… or tests done on a new cavity and not a older one that has a dark metal color…. Please call Ray Deering if you feel my case may be a isolated one.
The part cost us almost $500… so you can see where I am concerned with its performance.
Thank you for your after hour support BTW….. its been very helpful.
I will clean and polish cavity and let you know the results.
Jim Wilson
Engineering WTJR TV
WTJR Engineering 