Fluke 179 won't tun on

[tibimakai]

Re: Fluke 179 won't tun on

Thank you guys, for all the effort. I appreciate it a lot.
Today, I don't have time to check these voltages, but tomorrow I will look at them.

[keeney123]

Re: Fluke 179 won't tun on

i don`t have diagram
under the resistor i think its pin 65 the empty pad its -2.5V OFF and it goes around 1.8v when its ON ofc same wave on scope .
for some reason its dropping the voltage when its ON

Seeing how you have a scope would you verify that the + side of what I think is the oscillator has a frequency when it is turned on and if it does can you tell me what is the frequency?

[keeney123]

Re: Fluke 179 won't tun on

i don`t have diagram
under the resistor i think its pin 65 the empty pad its -2.5V OFF and it goes around 1.8v when its ON ofc same wave on scope .
for some reason its dropping the voltage when its ON

That was a question for tibimakai.
The 179 and 175 are connected different in this area. So I would not think the voltages would be the same. tibimakai has a transistor connected to pin 65 and you do not. The instructions to the processor most likely are also different.

[dj_ricoh]

Re: Fluke 179 won't tun on

Do you have any voltage on pin 65? Also, if you have a o'scope does pin 65 fluctuate when it is turned on that is goes from a low to high and then back to low?
"retired caps" do you have a schematic of this board?

Perhaps Retired Caps has experience with Fluke Multimeters and knows something we do not. I believe he asked you to check the oscillator to see if it is working. Do you have a way to do this? I have circled what I believe is the oscillator in red and the whole oscillator circuit in purple. You would measure this at the pin on the processor chip.

i don`t have diagram
under the resistor i think its pin 65 the empty pad its -2.5V OFF and it goes around 1.8v when its ON ofc same wave on scope .
for some reason its dropping the voltage when its ON

[keeney123]

Re: Fluke 179 won't tun on

Do you have any voltage on pin 65? Also, if you have a o'scope does pin 65 fluctuate when it is turned on that is goes from a low to high and then back to low?
"retired caps" do you have a schematic of this board?

Perhaps Retired Caps has experience with Fluke Multimeters and knows something we do not. I believe he asked you to check the oscillator to see if it is working. Do you have a way to do this? I have circled what I believe is the oscillator in red and the whole oscillator circuit in purple. You would measure this at the pin on the processor chip.

[dj_ricoh]

Re: Fluke 179 won't tun on

To me, it seems like it is still connected. I measured right at the plastic.
Here is a picture taken with my phone, I can't really tell what is it, 1R?

i open my 175 just for you

how can i help?!?!?!?

my battery its 5.7v . i know its low !

i did some probing. if you need something else tell me just don`t ask me for parts value cuz i open it and can`t read them


sry should have written in white

[tibimakai]

Re: Fluke 179 won't tun on

To me, it seems like it is still connected. I measured right at the plastic.
Here is a picture taken with my phone, I can't really tell what is it, 1R?

[keeney123]

Re: Fluke 179 won't tun on

Just want to verify that you have ohmed out directly on the transistor pin where you show 6 volts to the preceding part? To make sure the run is not open just prior to the transistor? If we new the transistor type and number we could then determine if it is bad. Whether it is indeed a transistor or a cmos. We need to be able to tell if the transistor is bad or good. And if the processor out pin65 is actually telling this transistor/cmos to turn on. It could be a transistor and pin 65 could be connecting to its base pin or it would be a cmos and 65 could be connecting to the gate. This is where we need to find out what the number of the part is so we can look it up. Pin 65 is controlling the turn on of that part. Once we distinguish the above we will then know if we need to understand why the processor is not turning this pin on. There has to be a memory chip with instructions. This would be where a scope and better yet a logic analyzer would help.

[tibimakai]

Re: Fluke 179 won't tun on

I have checked and there is no brake or short at the 14 pin IC. Thanks though.
What I have noticed, is that the transistor on the left/up, by the digital Texas Instrument IC is getting 6V at the collector pin(which was pointed out earlier that it may be corroded-but it turns out, that is just fine), but nothing comes out of it.
I'm attaching a picture with my findings. If I measure that transistor(if it is one, I'm not sure), seems fine. I have measured 2x0.7V one way and nothing the other way.

[digge]

Re: Fluke 179 won't tun on

From your last pics it looks as if there is a break and/or short on the bottom side of the 14 pin ic. Might just be graphics artifacts due to picture compression though. The board also seems discolored around there?

[keeney123]

Re: Fluke 179 won't tun on

I have attached your picture of the top side of board with a red x on the run I question.

retiredcaps The Fluke number is 17x 3011 rev.36

I believe it is rev 36 as it is hard to tell if the 3 is a 3.

Also, it has a number KALEX3
K688
I believe it was made 2002. This is on the side of the board. It was inspected by #20

[tibimakai]

Re: Fluke 179 won't tun on

There are see, only diode sign.

[keeney123]

Re: Fluke 179 won't tun on

So the run going to the middle of it goes somewhere else? The run on the left side of the diode.

[tibimakai]

Re: Fluke 179 won't tun on

It has two legs.

[keeney123]

Re: Fluke 179 won't tun on

That diode has three legs? To me it looks like the run that comes into the middle of the "diode?" has got a break in it near the "diode?"

[tibimakai]

Re: Fluke 179 won't tun on

Both LEDs turn on, when I check with the meter.
Actually I have attempted those repairs. The first two are actually not important, because after connecting them, I have realized, that they go to the buzzer.
The transistor(which seems to be a diode though) repair, may not be good. To me, it seems like that leg is completely missing. The solder, may still touch that broken leg,, because when I measure it, shows as the others. If we manage to repair it, I will replace that diode.

[keeney123]

Re: Fluke 179 won't tun on

I have circled places on the board that had been either dinged or rework other than what you did. The run seems to go through the LEDs. Have you check to see if one is bad? One place on the front in the upper left hand corner on a run I have circle going to what appears to be a transistor may be broken at the transistor. I have not traced out the output of that transistor to tell were it goes.

[tibimakai]

Re: Fluke 179 won't tun on

That vertical trace, it was indeed broken.
Unfortunately joining it, did not help.
I have ran thin copper wires, through the via where the resistor goes to the top LED and where it was interrupted the trace. But still a no go.
I have made some indoor pictures, because outside is way to hot. Hopefully they are good enough.
The quartz does not show oscillation, only some millivolts.
The digital main IC is a Texas Instrument M430F437.
If I understand correctly, pin #1 should have the input voltage and there is 0V.
https://cdn.badcaps-static.com/pdfs/...487e34355c.pdf

[tibimakai]

Re: Fluke 179 won't tun on

I will clean it and take a good picture. Then I will check the traces.

[retiredcaps]

Re: Fluke 179 won't tun on

There looks to be a break in this copper trace right at the 9V + connector (circled in red). If yes, there will obviously be no power to the microcontroller/processor.

The meter can also benefit from a thorough IPA bath and careful inspection via 10x jeweler's loupe. See

http://mrmodemhead.com/blog/fluke-77...per-corrosion/

PS. The picture can be clearer. If I can't clearly read the writing on the pcb, it is not good enough.