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453 scope fan wiring help needed!
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Phillip Potter
Hi all,
The fan on my scope was very noisy, so I pulled the back apart and got the fan apart from the shroud, only to find that the wiring is soldered in with no way to get the fan out to work on it.? So.... I cut the wires. Now, in the process of returning it to the scope, I've been reconnecting the wires, BUT in my clumsy style I managed to pull the shortest of the four (the black one) out of the back while attempting to strip it!? Grrrr. So, now I can't tell where the wire connects to the scope!? I have three different schematics (manuals) and NONE of the three show a fan with FOUR wires!!!? Only three...... What the heck?!? Is there anyone here who can shed some light on what I should do now?? That is... after I shoot myself! Thanks in advance for anything you can suggest. Phil |
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Phil
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Lets see if this makes sense There is a starter capacitor involved . 3 wire for the motor and 1 wire for the starter cap I think the other starter cap wire is common to the motor -DC On 3/30/2018 9:17 PM, Phillip Potter wrote:
Hi all, --
Dave Manuals@... www.ArtekManuals.com |
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Phillip Potter
Hi Dave,
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Yeah, there's a cap involved, for sure... will have to research is... tomorrow! Thanks, Phil On 3/30/2018 6:37 PM, Artekmedia wrote:
There is a starter capacitor involved |
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The manual that I have is three wires. I¡¯m wondering if one is chassis from the case. Time for an ohm meter and check what the resistances are. Two should have the coil between them. One should be 0 ohms to one of the coil and coil ohms to the other. If the 4th is chassis then it should only go to the can.
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On 31 Mar 2018, at 03:30, lop pol via Groups.Io <the_infinite_penguin@...> wrote: |
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Phil et all
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I found a later change page dealing with the fan wiring ( non trivial change) and have uploaded the change page to the file section. hopefully this matches your unit. The change page is in a FOLDER called "453 Late Model Fan" /g/TekScopes/files/453%20LATE%20MODE;%20FAN -DC manuals@... On 3/30/2018 9:17 PM, Phillip Potter wrote:
Hi all, --
Dave Manuals@... www.ArtekManuals.com |
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Phillip Potter
Thank you, Dave and Robin for your input.??? I will check it out.
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Phil On 3/31/2018 2:09 AM, Artekmedia wrote:
Phil et all |
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Phillip Potter
Well, during the reconnoitering to figure out where the black wire would be reconnected... the already too short red (actually, orange) wire broke yet again!? Now, it is too short to solder to. Why didn't Tek put a plug on the back of this fan?????? With all the extraordinarily well designed wiring in this scope, I can't wrap my head around them making it IMPOSSIBLE to remove this fan motor for maintenance!!!? #@%&*
Anybody have a 147-0027-00 fan motor, or a suggestion? Phil |
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Phillip Potter
Spoke too soon... there was one on FleaBay, shipped for $32. Pounced on that, like a duck on a June bug!
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Phil On 3/31/2018 12:22 PM, Phillip Potter wrote:
Anybody have a 147-0027-00 fan motor, or a suggestion? |
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This is a Permanent Split Capacitor motor. The cap, which is used all the time, not just for starting, causes a phase shift in its associated winding, which makes part of the overall magnetic field appear to rotate instead of just vibrating back and forth. Shaded-Pole motors do the same thing, less efficiently, with a shorted turn around part of the pole pieces.
I can see two uses for a fourth wire. It could be safety ground, or there could be two wires - possibly a separate winding - for the cap instead of one tap and one end. If you have a wire too short to reach, I guess it's moot. I too was upset by the noise of my (three-wire) fan, and after bearing replacement which made no difference, and cushion-mounting which didn't make enough difference to satisfy, I retrofitted a computer tubeaxial fan, which is less obnoxious and moves more air. I love it. I posted my experience in "453 fan bearings", and pictures in "453-454 Tubeaxial Fan Retrofit" at /g/TekScopes/album?id=12878. Regards, Dave Wise ________________________________________ From: [email protected] <[email protected]> on behalf of Phillip Potter <p.potter@...> Sent: Friday, March 30, 2018 6:17 PM To: [email protected] Subject: [TekScopes] 453 scope fan wiring help needed! Hi all, The fan on my scope was very noisy, so I pulled the back apart and got the fan apart from the shroud, only to find that the wiring is soldered in with no way to get the fan out to work on it. So.... I cut the wires. Now, in the process of returning it to the scope, I've been reconnecting the wires, BUT in my clumsy style I managed to pull the shortest of the four (the black one) out of the back while attempting to strip it! Grrrr. So, now I can't tell where the wire connects to the scope! I have three different schematics (manuals) and NONE of the three show a fan with FOUR wires!!! Only three...... What the heck?!? Is there anyone here who can shed some light on what I should do now? That is... after I shoot myself! Thanks in advance for anything you can suggest. Phil |
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