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N_Cook <diverse@tcp.co.uk>: Jan 28 01:23PM I replaced the triac with similar rating and same symptom. Runs perfectly smoothly, bypassing the control pcb, feeding 60V,.15A DC bench ps. Pot and Rs ok, DB3 diac tests ok dropping +/-30V on droppered 35V supply. Even checked the switch current carrying . Just leaves 2 caps, that I've not ESR'd or LCR'd yet. A better triac match required?

N_Cook <diverse@tcp.co.uk>: Jan 28 02:52PM 100nF, 250V, X2 class block cap, across the 2 wires to armature and stator, good ESR but only about 50nF. Perhaps spark eroded away and now arcing across internally, anyway will find a replacement for that and retry on mains

Cursitor Doom <curd@notformail.com>: Jan 27 09:23PM On Wed, 27 Jan 2016 06:24:46 -0600, Mark Zacharias wrote:     > Absolutely WOULD NOT be without it.   > Instantaneously find one bad amp channel out of many, very quick checks > of capacitance, inductance, resistance, diodes, fets, transistors, etc.   And it's capable of testing these components at their intended working voltages and currents? This seems to be the main shortcoming with almost all the small battery powered testers.

"Mark Zacharias" <mark_zacharias@sbcglobal.net>: Jan 27 08:46PM -0600 "Cursitor Doom" <curd@notformail.com> wrote in message news:n8bch7$fo6$6@dont-email.me...   > And it's capable of testing these components at their intended working > voltages and currents? This seems to be the main shortcoming with almost > all the small battery powered testers.   Mine uses a 6.3v AC transformer so no attempt is made to operate devices under load.   mz

Cursitor Doom <curd@notformail.com>: Jan 28 11:48AM On Wed, 27 Jan 2016 20:46:54 -0600, Mark Zacharias wrote:   > Mine uses a 6.3v AC transformer so no attempt is made to operate devices > under load.   > mz   But you still find that exposes every form of damage you encounter in practice?

"Mark Zacharias" <mark_zacharias@sbcglobal.net>: Jan 28 06:41AM -0600 "Cursitor Doom" <curd@notformail.com> wrote in message news:n8cv5k$3i4$3@dont-email.me...   >> mz   > But you still find that exposes every form of damage you encounter in > practice?   I never said "every form" but it is a powerful tool.   Like oscilloscopes.   Like multimeters.   Like an esr tester. (Even though the "curve tracer" can give a quick check of esr in many situations.)   It's usable in-circuit and once a person is proficient with it, can VERY often cut troubleshooting time dramatically. (Test current is resistance-limited, depends on exact schematic of the curve tracer. There are many variations.)   We all have our favorite tools and little tricks to help us in what we do.   This is just one more.     Mark Z.

"Mark Zacharias" <mark_zacharias@sbcglobal.net>: Jan 28 06:46AM -0600 http://www.techlib.com/electronics/curvetrace.html   A sample curve tracer "octopus" schematic.   mz

Cursitor Doom <curd@notformail.com>: Jan 28 01:34PM On Thu, 28 Jan 2016 06:46:59 -0600, Mark Zacharias wrote:   > http://www.techlib.com/electronics/curvetrace.html   > A sample curve tracer "octopus" schematic.   > mz   Thanks, Mark. I'll take a look on youtube see if I can find any tips on how to use these under practical conditions to take in-circuit measurements. I have more than enough scopes here with x-y/comp tester inputs.

"Michael A. Terrell" <mike.terrell@earthlink.net>: Jan 28 01:00AM -0500 > I don't know how you get here, but Google and aioe or whatever seem to be the only free ways to do it. Actually I probably should get a paid service but then, who gets that money ? Originally I got here via AOL but they stopped doing everything I wanted so I got rid of them.     There are a lot of free, or dirt cheap NNTP servers. It is included with any Earthlink account and I can set up, up to eight Usenet accounts with my Broadband account. One for each Email account.

"ذكريات حسن" <thekra8@gmail.com>: Jan 27 02:53PM -0800 This is Thekrayat and a grad student at the University of Arkansas I am working with an old Argon ion laser, so Coherent company is not support this product an more.   The problem with this laser is that the Cathode current is decreased to 27 A then the laser is turning off by itself with " Fired starter 5x" fault massage. The technical support thinks that the laser tube is old and need to replace by a new one. I have checked the water level, interlock, and tube pressure, and every thing is ok. Also, I think there is no problem with the resistance of the four fuses in the power supply.   Is there any way to fix this laser without changing the laser tube? Thanks

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