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Author Topic: 10mhz motherboard issue  (Read 3845 times)

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Offline Badbaud

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Re: 10mhz motherboard issue
« Reply #20 on: February 15, 2019, 03:00:41 PM »
That is normal.
Did you check the diodes near the power connector the transformer plugs into?
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Offline Thegadgeteer

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Re: 10mhz motherboard issue
« Reply #21 on: February 15, 2019, 04:32:47 PM »
I'll do that tonight. Are they the IN6373s too?


And, what's a good source for those parts, now that Radio Shack is gone?
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Re: 10mhz motherboard issue
« Reply #22 on: February 15, 2019, 06:47:34 PM »
1N5401, try Jameco Electronics or Mouser Electronics.
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Offline Thegadgeteer

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Re: 10mhz motherboard issue
« Reply #23 on: February 16, 2019, 02:41:40 AM »
Ok, I believe they are good. 41k-48k ohms from the anode; open from the cathode.
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Offline Stayouttadabunker

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Re: 10mhz motherboard issue
« Reply #24 on: February 16, 2019, 07:16:03 AM »
I was wondering about about how to compare our readings to find out if our IC component is out of specs
from those data sheets that companies like Mouser/Jameco puts out online?
or are we just checking to see if they're shorted out?

Below is the 1st page from a 1N5401 data sheet...>>>

« Last Edit: February 16, 2019, 07:35:35 AM by Stayouttadabunker »
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Re: 10mhz motherboard issue
« Reply #25 on: February 16, 2019, 07:22:31 AM »
Quote from: Thegadgeteer on February 16, 2019, 02:41:40 AM
Ok, I believe they are good. 41k-48k ohms from the anode; open from the cathode.
Pull one leg out and check each with the diode checker.
You are looking for a open as well as a short.
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Re: 10mhz motherboard issue
« Reply #26 on: February 16, 2019, 07:23:53 AM »
There is a newer diode that replaced the 1N5401 but my schematic was so fuzzy I could not read it.
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Re: 10mhz motherboard issue
« Reply #27 on: February 18, 2019, 09:22:25 AM »
Quote from: Badbaud on February 16, 2019, 07:22:31 AM

Pull one leg out and check each with the diode checker.
You are looking for a open as well as a short.


Done. All good. 580-640, no shorts. What's next?
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Re: 10mhz motherboard issue
« Reply #28 on: February 18, 2019, 03:43:08 PM »
You either need to further test the board with a oscilloscope or send it to our shop so I can test it on our tester OR buy a working, tested, board from one of the vendors on NLG.
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Re: 10mhz motherboard issue
« Reply #29 on: February 19, 2019, 05:29:30 PM »
Actually, I already bought one. I was hoping to fix this one myself. I'll keep you in mind, though. What do you charge for a diagnosis?
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