C
Chuck
- Jan 1, 1970
- 0
I am helping a friend who owns a restaurant to repair a large marquee sign
in his front parking lot. The sign was working fine for the last 3 years
until recently. The sign uses two separate horizontal banks of 5 linear 72"
(F72T12/D/HO) lamps per sign ballast. The pin style is recessed double
contact. The input voltage is 120VAC. The label on the sign ballast has
aged but looks like its a Rapid Start - Magnetic, Valmont 6G3959WF. I
think this is a 4 lamp ballast (not a 5 lamp). There are a total of two
ballasts, one for each bank of five lamps, for a total of ten lamps. One
bank of five lamps works just fine. However, on the other set of five, only
one lamp, the one at the bottom physically closest to the ballast lights up.
All of the lamps have been confirmed to work by removing them one at a time
and testing them in the working lowest socket. I now need to troubleshoot
this bank of lamps while standing on top of a 12ft step ladder in the middle
of a parking lot.
Troubleshooting Questions:
- Since one lamp still works, can the ballast be considered 100% good?
Chuck
in his front parking lot. The sign was working fine for the last 3 years
until recently. The sign uses two separate horizontal banks of 5 linear 72"
(F72T12/D/HO) lamps per sign ballast. The pin style is recessed double
contact. The input voltage is 120VAC. The label on the sign ballast has
aged but looks like its a Rapid Start - Magnetic, Valmont 6G3959WF. I
think this is a 4 lamp ballast (not a 5 lamp). There are a total of two
ballasts, one for each bank of five lamps, for a total of ten lamps. One
bank of five lamps works just fine. However, on the other set of five, only
one lamp, the one at the bottom physically closest to the ballast lights up.
All of the lamps have been confirmed to work by removing them one at a time
and testing them in the working lowest socket. I now need to troubleshoot
this bank of lamps while standing on top of a 12ft step ladder in the middle
of a parking lot.
Troubleshooting Questions:
- Since one lamp still works, can the ballast be considered 100% good?
Chuck