I-90 laser problem

From: Arnold Richard Pizzey (a.pizzey@ucl.ac.uk)
Date: Fri Jun 21 2002 - 05:32:10 EST


Greetings all,

I am experiencing a problem with my I-90, If I try to advance the current
beyond 25A I get a lot of electrical noise -sounds a bit like arcing but
I've checked all components on the power supply and laser head and find no
evidence of this.

The voltage across TP16-36 is 240V with the tube not struck and 190V at 25A

also the relay next to TP28 keeps closing -I think that the tube might be
trying to take gas fills but I think that the autofill has been disconnected.

If anyone has any experience of this problem I'd appreciate it if they let
me know


Regards,



Arnold


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	Arnold Richard Pizzey
	Department of Haematology
	Royal Free and University College London Medical School
	98 Chenies Mews
	London WC1E 6HX
	U.K

	voice:	+44 020-7679-6234
	Fax:	+44 020-7679-6222
	email:	a.pizzey@ucl.ac.uk
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