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Sorry, I first replied to your message without having read it
carefully. Apparently it's not the cable... We had a similar problem
with a Melles Griot Ar laser (it wouldn't start and go on clicking)
which went away after we simply propped up the cable with an empty
box.

Michael Model
Confocal Imaging Core
Kent State University
tel. 330-672-2304

----- Original Message -----
From: Nishigandha Naik <[log in to unmask]>
Date: Monday, January 10, 2005 0:31 am
Subject: Argon Laser for MRC1024

> Search the CONFOCAL archive at
> http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
>
> Dear Friends,
>
> We have a laser confocal microscope MRC 1024 from
> Bio-Rad, attached to a 25 mW argon ion laser from
> American Laser Corporation (Model:  1H 19BR 00 REVD,
> Serial: 60 AR-03/97-80 11H). Suddenly, one morning the
> laser was not switching ON. Only ticking sound was
> heard from the laser enclosure. Our institutional
> expertise tried following checks to diagnose the
> problem.
>
> 1. Input supply checked. Found OK
> 2. Power supply and laser checked for any loose
> connections, etc. Found everything OK.
> 3. Power supply boards, components were checked for
> any visible damage, possible fault in cards,
> transistors, other electronics etc. No problem was
> found.
> 4. Laser enclosure was thoroughly checked. Two
> components were found defective, one was 680 nf/ 630V
> polyster capacitor and another was SCR C122M1. Both
> were replaced.
> 5. There was a supply to cathode and cathode was
> warming up.
> 6. Anode current pulses were present, but no flash of
> light present
> 7. Ticking sound was heard each time whenever the
> laser was ignited.
> 8. One heat sensing thermistor was found defective. It
> was temporarily bypassed, but still no improvement was
> observed.
> 9. Checked for possible misalignment of resonators.
> Nothing abnormal found.
> 10 One more part was suspected and that was of part
> no. K2500F1 -- it is a SIDAC (Silicon Bidirectional
> Voltage Regulator Switch, 280V, 1A). This part is not
> available in the local electronics component market.
>
> I will be thankful if you could give me suggestions
> and help to make our LCM functional.
>
> Nishigandha Naik
> Cancer Research Institute
> ACTREC, Tata Memorial Centre
> Navi Mumbai 410208, INDIA.
> Tel: 91-22-27405000
> Fax: 91-22-27412894
>
>
>
>
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