I have a Uniphase 2114 -25ML Power supply and a 2211-25ML Head.
When it arrived I powered it up and it worked. Nice Blue Beam.
After a short time their was a slight electrical burning smell from the power supply. I turned it off and let it sit for a while. Powered it up again the beam came on and the same smell. I turned it off again.
After letting all the voltage drop I opened up the power supply. Straight away i saw a heated mark on the main tube voltage regulator board. I diss-assembled the power supply and checked. It was a 10 volt 5 watt zener that was cooking. I tested it and it's stuffed. This 10 volt zener is the only component on the output of a small bridge rectifier. It appears connected to a toroid on the main ouput circuit. The bridge rectifier meters out fine.
I bought a new 10v 5w zener and installed it. The rest of the power supply looks in excellent condition.
I re-assembled the power supply. Turned it on. Switch in Idle mode and light mode. After the timer it fired up. Low power blue beam. I was carefully sniffing the power supply for anything abnormal. Power supply seemed ok.
After about 30 seconds the beam went out.
Now i can't get it to ignite again. The ignition LED does come on after the timer.
Did some testing.
Filament has 3.4 volts and glows a nice orange colour.
Anode has 176 volts on it while trying to ignite.
I think the igniter is working as about every 2 seconds my meter blinked over scale while measuring the Anode Voltage.
Any help would be appreciated. The tube is 25 years old and power supply 20 years old.
Charles
When it arrived I powered it up and it worked. Nice Blue Beam.
After a short time their was a slight electrical burning smell from the power supply. I turned it off and let it sit for a while. Powered it up again the beam came on and the same smell. I turned it off again.
After letting all the voltage drop I opened up the power supply. Straight away i saw a heated mark on the main tube voltage regulator board. I diss-assembled the power supply and checked. It was a 10 volt 5 watt zener that was cooking. I tested it and it's stuffed. This 10 volt zener is the only component on the output of a small bridge rectifier. It appears connected to a toroid on the main ouput circuit. The bridge rectifier meters out fine.
I bought a new 10v 5w zener and installed it. The rest of the power supply looks in excellent condition.
I re-assembled the power supply. Turned it on. Switch in Idle mode and light mode. After the timer it fired up. Low power blue beam. I was carefully sniffing the power supply for anything abnormal. Power supply seemed ok.
After about 30 seconds the beam went out.
Now i can't get it to ignite again. The ignition LED does come on after the timer.
Did some testing.
Filament has 3.4 volts and glows a nice orange colour.
Anode has 176 volts on it while trying to ignite.
I think the igniter is working as about every 2 seconds my meter blinked over scale while measuring the Anode Voltage.
Any help would be appreciated. The tube is 25 years old and power supply 20 years old.
Charles