Blue Flash Dave
New member
- Joined
- Jun 29, 2022
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- 4
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Hello ! I've finally found people who appear to know all about Omnichrome series 74. I dont suppose you have the circuit diagram for the head : only I cannot get the head to lase. It appears to try to start but the LC controller stops after 15 seconds and shuts it down. The error code is not specific.The helium heater should come on very rarely. It only comes on if the He pressure is low.
The Cd heater will be on every startup as it must vaporize the solid cadmium metal on every run.
How long are you running it for? A HeCd takes 10-15 minutes to heat up and start lasing once you set it to run.
Are you sure it's the UV model? What's the full model number? I'll see if I can dig out the list of models from when I had one.
What are you terminating the beam on? The UV emitted by a HeCd will make many things fluoresce a very brightly, plain white paper for example fluoresces nrightly with quite a deep blue colour. Terminating the beam on a piece of metal should produce no fluorescence.
What colour does the tube glow on startup and once it has been running for 15 minutes?
I am a bit suspicious about the head PCB - there appears to be a missing component, possibly a relay, called 'K2'. Here are some photos - would you be able to help ? The head is in pristine condition physically...