Diagnostic tests on the Ryobi Scroll Saw SC164VS.

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Sujet : Diagnostic tests on the Ryobi Scroll Saw SC164VS.
De : peter (at) *nospam* easthope.ca
Groupes : sci.electronics.repair
Date : 19. May 2026, 20:14:00
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <10uicpo$3g3bb$1@dont-email.me>
User-Agent : Oberon Mail (ejz) on LinuxA2 Gen. 32-bit, rev.9799
Hello again,

A correct understanding of a problem should allow a hypothetical
identification of a faulty component.  Replacement of the component
allowing the machine to work tends to support correctness of the
understanding.

My schematic is here.
https://easthope.ca/RyobiScrollSawSC164VSboard.jpg

In my previous hasty efforts, replaced the diode bridge, the triac and
the speed adust pot.

I think of two simple tests.

Make the circuit board accessible and connect the power plug to a
variac, initially powered off.

(1) Jumper the two terminals (not the gate) of the triac and supply 10
to 15 V with the variac.  If the motor turns, it's probably OK. 
Remove the jumper.

(2) Jumper across the diac, marked ? in the schematic, and supply 10
to 15 V with the variac.  If the motor turns, the failure is probably
in the diac.  Replace the diac an check whether the machine works.

Any warnings before I blunder further?

Thx,             ... P.


Date Sujet#  Auteur
19 May 26 * Diagnostic tests on the Ryobi Scroll Saw SC164VS.13peter
19 May 26 +- Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.1Jeff Liebermann
20 May 26 `* Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.11ehsjr
20 May 26  `* Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.10Jeff Liebermann
20 May 26   +* Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.2Jeff Liebermann
20 May 26   i`- Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.1Jeff Liebermann
20 May 26   `* Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.7ehsjr
20 May 26    `* Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.6Jeff Liebermann
20 May 26     `* Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.5ehsjr
4 Jun 26      `* Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.4peter
4 Jun 26       +- Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.1legg
7 Jun 26       `* Re: Diagnostic tests on the Ryobi Scroll Saw SC164VS.2ehsjr
8 Jun 26        `- Re (2): Diagnostic tests on the Ryobi Scroll Saw SC164VS.1peter

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