Re: Magneto-resistor Digital Output Potentiometer
Hi Budm,
Attached is the scanned copy, I am not sure if I can post the make and model since might be infringement. It is a wafer inspection machine in which the wafer is being tilted in x and y axis. Also going up and down for more focus on the microscope. The old sensor is not accurate anymore and when I tested it, at the max point is 3.7V only as compare with good of 4.5v with input of 5v. the min is within range of 1.3v as compared with the good one of 1.5v.
Again I am looking for advice if anybody is familiar...
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Re: Magneto-resistor Digital Output Potentiometer
I found below comparison, Im still not sure if i can use the "hall effect" as replacement.
Magnetoresistive Sensors 279 and Hall Effect Sensors 73 are both commonly used to detect magnetic field strength. Both technologies are compatible with integrated circuit processing. So is there any difference between them when designing a sensor application?
In general, [B][U][COLOR="Red"]Magnetoresistive sensors have much higher sensitivity than Hall Effect sensors.[/COLOR][/U][/B] A magnetoresistive...
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Re: Magneto-resistor Digital Output Potentiometer
Hi STJ,
I do have a good one in which i tried to run a DC inout voltage, I notice that the PSU that I am using did not indicate a current at any time while i was rotating the potentiometer. When it drop to min 1.5vdc to 4.5vdc there was no currrent draw. I then though that maybe that was the OEM was talking about that this one has digital output, while if he would provide me with their latest one that is inductive contactless potentiometer which is analog output there would be a current draw and my opamps would...
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Magneto-resistor Digital Output Potentiometer
Hello,
I am looking for a replacement for a Magneto-resistor type potentiometer model SMP-1504 by manufacturer SAKAE TSUSHIN KOGYO CO., LTD. I have already contacted them but they no longer manufacture this type. [ATTACH]229668[/ATTACH]
What the manufacturer have are inductive types which they say is analog output and is not compatible with the Magneto-resistor type which is digital output. I am not sure why is it not compatible that but I did test it with according to specs input voltage of 5vdc and its out of 1.5v min and 4.5v max is according to specs also.
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Re: Please help identify component, repairing NSX PSU, PSA-6700p
Hello again,
Here is the drawing, with the suspected Japanese marking. Accroding to the semicon tester that I used, it is a PNP silicon BJT. The packaging is SOT-89
It is installed with KA3505 -PC SMPS Supervisory IC.
...
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Re: Capacitor replacement
The capacitor was from a power supply, it was determined to be bad using an ESR meter. Measured capacitance was 1000UF. Im planning to bank a few smaller capacitor to duplicate the big one. Advice are welcome.
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Re: Capacitor replacement
"cant handle the current" means also it will blow at some point, or it can still be used but it will not filter the ripple properly as compared to the big one?
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Capacitor replacement
Hi,
I am trying to replace a defective capacitor the one on the left side, rated 47,000uF/7.5VDC with the one on the right rated 47,000uF 10V. The question is, the size is a big difference. The other one is humungus, the size of my fist, while the other one is slightly bigger than my thumb only. I know that through the years the size of the capacitors that shrunk due to technical advancement, but this is like time 10 shrinkage? i have seen half the size shrink, but this one, the replacement is so small I am thinking something will went wrong if I go ahead with the replacement. Any advice...
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Power supply PF pin question.
Hi,
I am trying to repair a power supply with a pin label that I have not encountered before. It is labeled "PF". Below is also the picture when I tried measuring with a scope. Anybody has an idea what is it? Looks like a power good signal also.
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Please help identify unmark glass diode
Hi Guys,
Please help identify this diode, as shown in the diagram below. I have check in the microscope, it really does not have any marking at all. It is used in power regulator unit.
...
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Re: HP DC7700 No POST, No Display
the capacitors are OK both on capacitance value and ESR(below 1 ohm). The Vcore, I think around 1volts something, not really sure, but I did compare with the other good motherboard and it is the same, thats why I dont remember exactly the value.
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Re: HP DC7700 No POST, No Display
i did swap the BIOS IC from the other good motherboard. the bad motherboard still did not POST and the good motherboard POST and there is a display. Is swapping BIOS IC equivalent to flashing?
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Re: HP DC7700 No POST, No Display
anybody have a diagram for this? if I want to check if north bridge or southbridge is ok, is there a signal I could measure?
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Re: HP DC7700 No POST, No Display
saw this online, thanks techtiger. I will try this, more suggestions are welcome.
2. Hot Swap your BIOS chip and re-flash:
Hot Swapping is a technique used to flash bios using another similar motherboard. You need to have access to a exact same motherboard model (different models with same chip might work). I tried this method as well and I can confirm it works flawlessly! I wrote a separate post about how I did it. See below,
How I fixed my corrupted BIOS chip by Hot Swapping
3. Re-flash your...
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HP DC7700 No POST, No Display
Hi All,
I have an HP DC7700 motherboard with no POST and no display. I have swapped the CPU, reset the BIOS, and swapped the power supply ( i have 4 identical units) and still nothing.
Below is the measure voltages from the 24pin connector and the 6 pin connector when the power on switch was on and off.
I hope somebody can guide me on the next step to isolate what could have caused the problem. Thanks
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Re: please help identify burnt resistor, repairing EMACS PSU
Hello Again,
The value of the resistor is 16 ohms. Im not sure if this is the original value. From the transformer, it entered the schottky and resistor and out into the inductor to the 5v standby wire.
I missed to measure the 5v standby that day I checked for the output, but I checked the transformer, it is not open.
Anybody got an equivalent schematic for this kind of PSU base on the picture below?
...
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please help identify burnt resistor, repairing EMACS PSU
Hi All,
I am currently repairing an EMACS PSU model: PSA-6700P with a burnt resistor. If anybody can provide a schematic that would be great. Currently the PSU dont have an output after triggering the PS_on. I have found a lot of high ESR caps. The only short I found was the schottky diode just behind the burnt resistor. I have traced this resistor to be connected to the 5v standby.
Thanks in advance!...
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please help identify IC, repairing supermicropPSU
Hello,
Please help identify this IC with top markings: EZDQ 324 MRC129. It has an ST logo also. This is from the Supermicro PSU usually used for bitcoin mining. Thanks all
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