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Search: Posts Made By: Kg74
Forum: Troubleshooting Power Supplies and Power Supply Design 03-31-2021, 09:59 PM
Replies: 27
Views: 1,200
Posted By Kg74
Re: An old dinosaur bench top power supply - help needed

Well the parts arrived from China and are now installed into the modified unit.

Attached are the photos - First is from the Top View displaying the incredible complexity of the modification. It...
Forum: General Electronics Technical Discussion 03-23-2021, 04:36 PM
Replies: 1
Views: 161
Posted By Kg74
What is the difference in these two chips?

Need to know if I can swap a LS166A where a LS116 was originally used.

Here are the two data sheets:

https://lsicsi.com/datasheets/LS7166.pdf

https://lsicsi.com/datasheets/LS7166A.pdf

Am...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 03-18-2021, 11:20 PM
Replies: 6
Views: 1,170
Posted By Kg74
Re: Identify Diode Canon EOS M50

Man I am not happy. I spent an hour working on my message and was timed out.

Summary - I think it is a regulator of some type.

I think there are three pins, one in the middle from the trace...
Forum: Troubleshooting Game Consoles & Other Weird Devices 03-18-2021, 09:57 AM
Replies: 8
Views: 1,257
Posted By Kg74
Re: Celestron Telescope Motor Controller SMD Cap ID help

stj - does this help?

Of note, the Serial/Main Board differs from the current board.
Forum: Troubleshooting Game Consoles & Other Weird Devices 03-17-2021, 11:25 PM
Replies: 8
Views: 1,257
Posted By Kg74
Re: Celestron Telescope Motor Controller SMD Cap ID help

I have done some more testing - so here is the update. Attached is a capture of the relevant schematic portion. Testing performed was with all parts soldered on the board.

I tested the Diodes...
Forum: Troubleshooting Game Consoles & Other Weird Devices 03-17-2021, 05:46 PM
Replies: 8
Views: 1,257
Posted By Kg74
Re: Celestron Telescope Motor Controller SMD Cap ID help

stj - under the stickers lie two PIC16F876s. I have replaced them both and flashed them with firmware. So I replaced the following: C1, C2, U5, U11, U2 and U7. (See Post #1 for schematic and...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 03-17-2021, 12:53 PM
Replies: 6
Views: 1,170
Posted By Kg74
Re: Identify Diode Canon EOS M50

https://html.alldatasheet.com/html-pdf/575793/ROHM/EMD62/94/1/EMD62.html

Does this help?

You should post some better pictures, including the front and back of the board.

I have searched for...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-03-2021, 11:15 PM
Replies: 27
Views: 1,200
Posted By Kg74
Re: An old dinosaur bench top power supply - help needed

The power supply is from a company that is no longer in business. It was founded in 1983 so the unit is no older than 38 years. Like in the title - an old dinosaur. As the picture shows the design...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-02-2021, 11:40 PM
Replies: 27
Views: 1,200
Posted By Kg74
Re: An old dinosaur bench top power supply - help needed

Excellent. Thanks again for your help RJ. I will circle back in a few weeks when the board comes. Appreciate your and redwire's answers and guidance.
Forum: Troubleshooting Power Supplies and Power Supply Design 03-02-2021, 11:33 PM
Replies: 27
Views: 1,200
Posted By Kg74
Re: An old dinosaur bench top power supply - help needed

RJ - Thanks again. I will place the order. It will be weeks before it shows up.

Any idea how to get the analog meter to also work?
Forum: Troubleshooting Power Supplies and Power Supply Design 03-02-2021, 11:28 PM
Replies: 27
Views: 1,200
Posted By Kg74
Re: An old dinosaur bench top power supply - help needed

RJ - I performed the test. VOM negative to heatsink and VOM positive to negative leg of the gray vertical 100uf 50v cap. As I turned the pot the resistance would increase and decrease.

I did the...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-02-2021, 11:19 PM
Replies: 27
Views: 1,200
Posted By Kg74
Re: An old dinosaur bench top power supply - help needed

Would I be able to use this eBay board? https://www.ebay.com/itm/LM317-Step-down-Power-Module-Adjustable-DC-Regulator-Power-Supply-Board/191944815983?hash=item2cb0cd756f:g:aN4AAOSw-itXrY-G

Take...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-02-2021, 11:09 PM
Replies: 27
Views: 1,200
Posted By Kg74
Re: An old dinosaur bench top power supply - help needed

RJ- No voltage on the output.

I put the ground of my VOM on the heatsink and poked the probe under the board. One leg read 30V and the other gave no reading.
Forum: Troubleshooting Power Supplies and Power Supply Design 03-02-2021, 11:01 PM
Replies: 27
Views: 1,200
Posted By Kg74
Re: An old dinosaur bench top power supply - help needed

Thanks redwire and thanks again RJ.

RJ - The regulator reads about 30V on one leg and nothing on the other, regardless of where the pot is set. So the 7805 is dead.

The browned resistor is...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-02-2021, 10:19 PM
Replies: 27
Views: 1,200
Posted By Kg74
Re: An old dinosaur bench top power supply - help needed

Thanks RJ - sounds like it may be worth some attention. I measured the transformer output and it is 25V a/c. Diodes seem to check out.

Any suggestions on testing the UA7805? Can it be done on...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-02-2021, 09:59 PM
Replies: 27
Views: 1,200
Posted By Kg74
An old dinosaur bench top power supply - help needed

I have had this old bench power supply which I have decided to look into repairing. I have no idea where it came from.

Attached is a picture. I cannot find much information on it to even figure...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 03-02-2021, 08:25 PM
Replies: 6
Views: 1,170
Posted By Kg74
Re: Identify Diode Canon EOS M50

I believe that is a diode.

I believe the R050 DZ8N is a fuse. That is most likely the problem. What is it reading resistance wise? Plug in the numbers and do some digging. I have repaired a...
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-28-2021, 12:28 PM
Replies: 8
Views: 1,257
Posted By Kg74
Re: Celestron Telescope Motor Controller SMD Cap ID help

Here is some additional background. I purchased the scope in its current failed condition. I was told that someone connected 120V a/c to the power port rather than the required 12 d/c. Someone has...
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-27-2021, 10:50 PM
Replies: 8
Views: 1,257
Posted By Kg74
Celestron Telescope Motor Controller SMD Cap ID help

I have a Celestron Nexstar 11GPS scope that has a failed Motor Control Board. I need help identifying the SMD capacitors.

The schematic I have found does not list the values, or for most of the...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 07-10-2019, 12:16 AM
Replies: 2
Views: 1,266
Posted By Kg74
Re: Nikon D700 repair experience?

The D700 is an old, but wonderful camera. Do you have any idea how many cycles on the shutter? Did it take a fall? Did it get wet? Did it, near its demise, start to have random black frames with...
Forum: Troubleshooting TVs and Video Sources 03-15-2019, 05:07 PM
Replies: 7
Views: 690
Posted By Kg74
Re: TV repair workshop advice please

Not sure in Spain, but here one can get a shower door cut to size of various thickness. I suppose one could even look for a used shower door from a remodel.

Bins and shoe boxes with labels is the...
Forum: Troubleshooting TVs and Video Sources 03-14-2019, 07:28 PM
Replies: 7
Views: 690
Posted By Kg74
Re: TV repair workshop advice please

I don't have a shop, but here is what I would add.

I use a mirror for viewing the screen with a magnet on the base. I can attach it to my storage racks if the screen is vertical or on the floor...
Forum: Troubleshooting TVs and Video Sources 03-09-2019, 11:37 PM
Replies: 2
Views: 548
Posted By Kg74
Re: Replacement LED question - what will work?

Thanks budm. I looked through all the listings and could not find anything that looked the same. If you would answer some additional questions I would appreciate it.

1) What is the difference...
Forum: Troubleshooting TVs and Video Sources 03-09-2019, 04:35 PM
Replies: 2
Views: 548
Posted By Kg74
Replacement LED question - what will work?

Hello: Need some help on replacement LEDs for my Westinghouse LD-3255VX. Bothered by a bright spot or dark spot on the panel, I decided to pull it apart and test every LED. A group of four or so,...
Forum: Troubleshooting TVs and Video Sources 03-01-2019, 09:20 PM
Replies: 2
Views: 489
Posted By Kg74
Re: Toshiba 37XV500A low backlight intensity

Hard to tell without seeing the board. Does the unit have 1, 2, 3, or 4 bulbs? Maybe one side is out - not sure if possible but maybe 3 out of 4 bulbs are out. Open it up and post some pics.
Showing results 1 to 25 of 49

 
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