On Tue, 19 May 2026 21:51:07 -0400, ehsjr <ehsjr@verizon.net> wrote:Of course not.
Instead, I would use 120 VAC input. With the triac shortedDo you test an automobile engine, chainsaw, or other speed controlled
MT1 to MT2, the motor should spin at full speed. If not,
a bad motor or bad bridge or bad wiring/connection.
devices by "flooring" the throttle or speed control to maximum, and
then applying power? Do you fix a hi-fi audio system with the volume
controls at full blast?
That's exactly what you're doing by shortingNo, it isn't. The scroll saw is made to run at full speed without
the triac.
self destructing. If he uses a variac set to 15 volts, it won't run
at all - the diac won't conduct.
Methinks a better idea would be to leave the triacs andThat might be better, I dunno. It may depend on the physical routing
wiring in place, and replace the scroll saw motor with an incandescent
light bulb.
and connections of the existing wiring, I figured since he mentioned shorting the triac, that that was easy for him to accomplish.
Incidentally, please note that my domain name isThat's true, but we're not talking about chainsaws or auto engines.
"LearnByDestroying.com". There's a reason for that name, which I
don't want to discuss at this time (dinner will soon be cold). Let's
just say that I learned from experience that spectacular methods of
self-education are effective, but usually not the best path toward
enlightenment.
If the motor spins at full speed, the triac circuit is failing,If you used that method to test an automobile engine or chainsaw, a
most likely the triac or the diac.
successful test would be the self-disassembly of the engine after it
exceeds the maximum RPM limit.
Incidentally, excessive RPM is aThose caps are too small in value. You're not going to find a bad cap
problem with engine and chainsaw repair, as well as other devices with
an adjustable speed (RPM) control. Maximum control position could
easily be higher than maximum safe RPM if the operating RPM requires
that the device be under load or if some creative engineer is using
some kind of rotation limiter on the control positition as a
mechanical maximum RPM limiter.
You can use your ohm meterUmmm, most low end ESR (equivalent series resistance) capacitor
to check the resistors and and a cap tester for the caps.
testers at designed to test at 100 kHz. There are a few that will
test at 60 Hz, but those are not common. In most cases, if the cap
tester shows acceptable ESR at 100 kHz, it also be acceptable at 60
Hz. However, I've been suprised by some situations where the test
frequency does matter.
<https://passive-components.eu/why-low-esr-matters-in-capacitor-design/>
in his circuit with an esr meter. A capacitance meter will show an open
cap if its open.
Ed
For all of the above your hands and test equipment will not be
in the device when 120VAC is applied, so it's safe for you. Shorting
the triac wont hurt the equipment during tests.
| Date | Sujet | # | Auteur | |
| 19 May 26 |  Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 13 | peter | |
| 19 May 26 |   Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 1 | Jeff Liebermann | |
| 20 May 26 |  Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 11 | ehsjr | |
| 20 May 26 |  Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 10 | Jeff Liebermann | |
| 20 May 26 | Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 2 | Jeff Liebermann | |
| 20 May 26 |  Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 1 | Jeff Liebermann | |
| 20 May 26 | Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 7 | ehsjr | |
| 20 May 26 | Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 6 | Jeff Liebermann | |
| 20 May 26 | Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 5 | ehsjr | |
| 4 Jun 26 | Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 4 | peter | |
| 4 Jun 26 | Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 1 | legg | |
| 7 Jun 26 | Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 2 | ehsjr | |
| 8 Jun 26 | Re (2): Diagnostic tests on the Ryobi Scroll Saw SC164VS. | 1 | peter |
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