I want to take apart a laptop cooling fan to find out why it stopped working. Is this possible? It looks like the fan blade assembly and shaft can be removed if I remove the plastic ring that is pressed onto the end of the shaft, but I can't figure out how to remove that ring.
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Re: Fan disassembly
I finally got it apart.
This is a Sunon GB0555AFB1-8, which is supposed to be a dual ball bearing fan, but it actually has one ball bearing and a sleeve bearing without any lubricant. They did the same thing (or worse - only a sleeve bearing) to the "dual ball bearing" KD1205PHB1 fan in my parts collection. I removed its label and saw a sleeve bearing with no lubricant. That is even worse because that fan spins at 5800 RPM. I can hear that its bearings are dry.
I want to get the circuit board out of this fan without destroying it. It looks like the board and coil are pressed into the housing.Attached Files -
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Re: Fan disassembly
I think that the control circuit in this fan is dead. The coil is not receiving a signal of any kind. It is connected to a 6-pin chip marked N024, located under the black insulation next to the bearing in picture 2 above.
How does this motor work with only one coil?Comment
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I am working on a backup phone to VHF paging solution. Basically I am dealing with the old Zetron pagers. Here is how it works: One calls a number, the Zetron picks up, operator punches in the DTMF access code, the Zetron keys the transmitter and you can talk. press # the Zetron unkeys the transmitter and hangs up / times out.
Now this setup works good on the old land lines, but not at all using a VOIP ATA.
You can call all you want and swear like a bastard at the Zetron, but it will not (even if I threaten it's life) pick up. 
Yep, I know about the high ring voltage... -
Hi all,
I'd like to add a ring tester to my toolbox to test flybacks but also low frequency transformers if possible.
I found a few products online, some based on the "diodegonewild" design, others are different designs. Some are available to build DIY, others are not.
Any suggestions on a DIY one I could put together? Ideally something which would also be able to test low frequency transformers, that might be handy.
So far I found these two:
http://bobparker.net.au/Basic%20Digital%20Ringer/ (the posher version... -
Introduction:
Hello everyone, this topic is more of a knowledge sharing and look inside type of post, but for someone working on this model of display it might be useful. Recently I bought Acer Nitro XV273 XB MIIPRZX with busted electronic, but screen was intact, price was incredibly low, so I took a gamble and bought the unit and try to fix it. As I dug inside, I found out that my motherboard was not responding, although all voltages seemed fine. I wasn't able to find any reliable information about this monitor on the web (only some pictures of motherboards from Ebay). By some research...04-18-2024, 12:47 PM -
The PCB motor for 1987 Technics SLP-120 CD player has slow spin-up issues. Similar to what another tech in the below video reported.
https://i.postimg.cc/kGrR6BpZ/image.jpg
I replaced the three bi-polar 47uF electros but that made no difference. The orig three bi-polar 47uF electros tested okay on my ESR M-tester.
I have not tested/replaced those alum. SMD electro PCB caps.
Are Al smd caps are more prone to failure (or degradation) than regular thru-hole electros?
All the thru hole electros I removed / replaced on this CDP (and most... -
I found this switching power which has a blowed fuse checked diodes which were still good out of circuit checked main filtering capacitor with an ESR meter 220uf@450 volts 0.15 value which to me seem bad but maybe not but without these items not in the circuit because I have about 8 ohm on the output of the capacitors so I removed the switching power supply transformer and checked it with a ring tester and all but one winding showed good all others either showed two red lights or no lights on and one winding had all lights on which was the only one that was good
One other check that...
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