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Old 05-15-2011, 04:18 PM #1
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Default HGM-5 help!

i have recently aquired a hgm-5 that has not been disturbed from its original medical configuration. i however did not get the foot switch control or any schematics. i am looking for the schematic or information on the internal wiring of the foot switch so i can test to see if it will lase.....mike


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Old 05-15-2011, 04:44 PM #2
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Default Re: HGM-5 help!

Mr. Roberts sent you what you need to get started already. How are you coming along with that?

HGM-5 help!
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Old 05-15-2011, 04:55 PM #3
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Default Re: HGM-5 help!

i have had problems geting any further information from steve because of a personal issue he is currently dealing with. what i am looking for is the wiring for the footswitch or the pin designation for the ribbon cable from the cpu to the psu. he sent me info on which pins to connect to idle and then full ouput the tube but there are no markings on the ribbon cable to tell me which pins are which.....mike
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Old 05-15-2011, 05:08 PM #4
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Default Re: HGM-5 help!

There's more than one way to mod these. I know he's worried about the sensitivity of this information, so here's a pic of my ribbon cable which should be enough if you have the configuration already.

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Old 05-15-2011, 06:32 PM #5
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Default Re: HGM-5 help!

i am tryin to find a 26 pin ribbon cable to cut up instead of ruining the cable from the hgm. i have a ribbon from a old computer i am going to slice a couple of pins off to use. where are you in wisc? i see you already have a model 5, interested in any more? i have a friend in the medical surplus industry who comes across them quite often. they purchase equipment from hopitals/clinics and associated places, sort it , fix it and resell it. they do not do anything with laser equipment though. they still receive it as part of a buy-out package. the lasers to them are typically scrap. he has a 85 watt co2 he wants me to take, i just don't know what to use it for yet.....mike
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Old 05-15-2011, 08:57 PM #6
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Default Re: HGM-5 help!

ok. i did the ribbon cable modification and it fired up, measured .367 vdc. ran it 15 seconds, shut it down cooled it off, lit it again, no problem. then i shut it down again, cooled it off, now it won't restrike. i have a nice amber glow on the cathode end but no lase. any ideas?
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Old 05-16-2011, 03:25 PM #7
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Default Re: HGM-5 help!

Does it try to start?

I'm an hour drive east of Minneapolis.
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Old 05-16-2011, 10:43 PM #8
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Default Re: HGM-5 help!

when i first fired it up i thought i might of heard what sounded like a relay click from the psu.i don't hear it now. i do however hear a high frequency squeal when i try to fire it.
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Old 05-16-2011, 11:32 PM #9
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Default Re: HGM-5 help!

Ouch That doesn't sound good. The only thing I can suggest is to look for burnt components and blown fuses. If I recall correctly, the molex's voltage readout times 20 is the tube current.
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Old 05-26-2011, 12:33 AM #10
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Default Re: HGM-5 help!

You need to set the potentiometers on the PSU to control them. It is not too exciting. A pet dragon told me this: On the ribbon connector going to the PS on the end it hooks into the CONTROLLER BOARD take the pins 15 and 17 and jumper them then run pins 9 and 19 to the thermal safety cutout on the tube, next take the pot farthest from the tube on the first controller card and turn it clockwise till it pegs out then turn the pot closest to the tube counterclockwise till it pegs out then turn it clockwise 7 turns or so, if it does not light the tube, keep turning clockwise until it does, then set at the desired amps you like to run at and forget about it :-) Hopefully the PS didn't blow up..
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Old 05-26-2012, 12:25 AM #11
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Exclamation Re: HGM-5 help!

Quote:
Originally Posted by totally wired inc View Post
ok. i did the ribbon cable modification and it fired up, measured .367 vdc. ran it 15 seconds, shut it down cooled it off, lit it again, no problem. then i shut it down again, cooled it off, now it won't restrike. i have a nice amber glow on the cathode end but no lase. any ideas?
you can't run these cw. they are built like duty cycle lasers. They can due a 500ms pulse at 500ms rep at max power, but unless the tube pressure is perfect, they will soon overheat and shut down. High pressure tubes on a model 5 is very common, they are , after all, 20 years old.
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Old 05-26-2012, 01:39 AM #12
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Default Re: HGM-5 help!

Nonsense. Many people have these, and they can run CW at a good 800mW - more if you beef up the cooling. Most other HGM models can't be run CW, but it's certainly not limited to 500ms pulses. In fact, pulses are bad, and running them at 1Hz like you claim would kill most any argon tube in a few hours if not less.

In their original application, they were designed to run up to around 3W for 30 seconds.
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