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General Chat / Re: Wreckage of MH370 washing up on Reunion Island?
« Last post by NiHaoMike on Today at 03:42:17 PM »
If it's not from MH370, where could it have come from?
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Repair / Re: Analog BK 1500 Scope Repair
« Last post by mij59 on Today at 03:40:47 PM »
I attached the schematic for the trig/sweep board if it helps.

Start by checking the absolute value and ripple of the power supply voltages.
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Repair / Re: Fluke 787 repair, any idea?
« Last post by retiredcaps on Today at 03:37:52 PM »
I have a busy day tomorrow so I will have to look at this tomorrow PM.  I'm off to bed soon.

I will have some suggestions and thoughts.  In the meantime, you may want to look at some of the solder repair videos at

https://www.youtube.com/user/paceworldwide/videos

I can't remember which one or ones is the repair series?
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Repair / Re: Analog BK 1500 Scope Repair
« Last post by mij59 on Today at 03:29:55 PM »
Got the Trio Kenwood CS2110 look almost identical to BK 1500 except for the 50 Ohm input option.
I can replicate the screenshot when in X-Y mode, do the horizontal display buttons work ?
Its strange that the single and reset led of the trigger mode are lit.
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Repair / Re: Analog BK 1500 Scope Repair
« Last post by xeonon on Today at 03:28:36 PM »
I attached the schematic for the trig/sweep board if it helps.
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Repair / Re: Fluke 787 repair, any idea?
« Last post by kamcm on Today at 03:25:56 PM »
High resolution image for the damage area :'(



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Projects, Designs, and Technical Stuff / Re: Designed a CRO in SPICE....
« Last post by tautech on Today at 03:25:29 PM »
Cool work as always from you Glen.  :-+
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Repair / Re: Fluke 787 repair, any idea?
« Last post by kamcm on Today at 03:21:58 PM »
Something really bad happened under the black rotary knob :palm: :palm: :palm:
Did you lend out this meter to someone?

Quote
It seem some kind of overload made it happened...  :bullshit:Is it blow away the trace?  :-// Is it still repairable? :scared:
Can we get another picture of the damaged area up close?  Both sides?

Do the DCV readings work now after cleaning it with alcohol?

BTW, while you are taking pictures, for yourself and others in the future, can we get some high resolution photos on the board in sections?  This will help you and others identify components on the pcb since there is no schematic.  Maybe take both sides of the pcb in 3 separate sections so we can see the writing on the smd chips.  If possible, try to get over 2000x2000 resolution for each section?  You can do this part later on.  There is no rush for this.


I will never lend out  my meter :-BROKE

=====
I did some testing again.

The ACV reading: Correct
The DCV reading: Correct
The DC mV reading: Correct
The ohm reading: OL


After the cleaning. the voltage reading is correct, but it will showing up OL when it should be 0 ohm.
I cleaned the carbon residue and I killed it :-DD 

I took it apart again and took some high resolution image for the damage area.
But I am not able to upload it to the forum. "Your file is too large. The maximum attachment size allowed is 2000 KB." :-//
I will upload it elsewhere.

Thanks,


9
Repair / Re: Samsung Galaxy S3 antenna connector identification
« Last post by stuarts on Today at 03:19:28 PM »
I ordered some of the connectors from element14. They are the correct connector for the phone. The only problem is I required 3 of them before I successfully soldered one onto the motherboard. They are so easy to both damage and drop. Once dropped they are lost. They are barely 2mm across.
Without the aid of my 30x stereo microscope I doubt that I could have soldered it. Even having filed a point on the soldering iron, it is still very fiddly to hand solder.
It can be done. My wifes phone is now fully functional.
Dont attempt this unless you are extremely sure of your fine soldering abilities.

Stuart
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I use the eagle auto router on every project. I first route manually the critical nets and then let the auto router do the rest. I care about functionality, not traces aesthetics.
If you're doing, for example, an audio amp with a SMPS, all your nets are "critical" to some extent.

I don't  ;-)

Mostly MCU stuff.  Roughly %25 of my nets are critical (power, crystal, USB lines, etc).  I also use the auto router to evaluate component placement.
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