Author Topic: Service manual Fluke 179  (Read 4878 times)

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Offline andy_speedy

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Service manual Fluke 179
« on: January 12, 2017, 02:00:26 pm »
Hello,
I have a Fluke 179 and looking for a service manual.
The meter is not working.
Battery has already been changed.
Can someone help me?
 

Offline retiredcaps

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Re: Service manual Fluke 179
« Reply #1 on: January 12, 2017, 06:22:40 pm »
You won't find any public service manuals with schematics, bill of materials, etc for any modern/current handheld Fluke multimeter.

If you want help, state what is not working and provide clear focused pictures of your meter pcb (both sides).

The more info you can give us, the more we can possibly help you.  "Not working" can mean a lot of things.
 

Offline andy_speedy

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Re: Service manual Fluke 179
« Reply #2 on: January 13, 2017, 10:05:00 am »
Hello here still a few pictures from the circuit board.
It does not do anything, either a display or turn on the lighting.
« Last Edit: January 13, 2017, 10:08:14 am by andy_speedy »
 

Offline jeroen79

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Re: Service manual Fluke 179
« Reply #3 on: January 13, 2017, 11:10:38 am »
It does not do anything, either a display or turn on the lighting.
Is that all it does not do?
Can you make the continuity checker beep? On my 179 the buttons also beep.
Do the resistance, continuity and diode modes produce current from the VoltOhm jack to the Common jack?
You could start by checking if the various ICs get power from the battery. You'll have to figure out which pins go to the battery though.
Can you measure some activity on the pads going to the LCD?
Could the zebrastrips going to the LCD or the LCD be faulty?
 

Offline andy_speedy

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Re: Service manual Fluke 179
« Reply #4 on: January 13, 2017, 11:59:35 am »
The lcd is a whole new one.
From time to time you can see a display on the display.
If you turn it on, there is a very quiet buzzing from the buzzer.
No change when pressing the buttons.

Where on the IC can I measure what?
 

Offline jeroen79

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Re: Service manual Fluke 179
« Reply #5 on: January 13, 2017, 12:28:08 pm »
I don't know the pinout of the ICs. But you can follow the traces from the battery and see where they go.
Does the display show a better or more consistent picture if you gently press it a bit harder against the PCB and zebrastrips?
What about the other functionality I mentioned?
 

Offline ModemHead

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Re: Service manual Fluke 179
« Reply #6 on: January 13, 2017, 12:57:32 pm »
jeroen79 asks good questions.  In addition, measure the current draw from the battery.  If it is significantly over or under about a milliamp or two, it could indicate power problems.  Also, examine the board carefully with magnification.  I have often found small amounts of corrosion with accompanying copper erosion in those Fluke models, even if the inside is otherwise relatively clean.
 

Offline andy_speedy

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Re: Service manual Fluke 179
« Reply #7 on: January 13, 2017, 01:11:54 pm »
I measure at the battery about 52mA current consumption.
 

Offline jeroen79

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Re: Service manual Fluke 179
« Reply #8 on: January 13, 2017, 04:30:32 pm »
That is quite high, mine does 2-3mA, 5 when it is sourcing for diode/ohm/continuity.
Is anything feeling warmer than the rest?
 

Offline retiredcaps

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Re: Service manual Fluke 179
« Reply #9 on: January 13, 2017, 06:20:31 pm »
I measure at the battery about 52mA current consumption.
52mA is about 20x more than expected.  Sounds like something might be shorted to ground on the pcb or the MSP itself?

This version of the 179 uses the MSP430.  Datasheet is at

http://www.ti.com/lit/ds/symlink/msp430f448.pdf

Some questions.

Q1) Is this your meter or did you buy it from ebay "as is" with the intent of fixing it?
Q2) When did this meter last work?
Q3) Was this meter used to measure something very high voltage (say > 240V)?
Q4) Did you lend this out to a friend?
Q5) Did you buy this new from an authorized Fluke dealer?
Q6) Why do you have a "new" lcd?
 

Offline retiredcaps

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Re: Service manual Fluke 179
« Reply #10 on: January 13, 2017, 06:23:39 pm »
Is anything feeling warmer than the rest?
I have a dead meter which is drawing 80mA (normal should be less than 5mA) from a 9V battery and I never found anything getting warmer by touching the components so I don't know if the OP will have any better luck than I.  Maybe my fingers aren't sensitive enough?
 

Offline carl_lab

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Re: Service manual Fluke 179
« Reply #11 on: January 22, 2017, 01:14:08 pm »
If battery idle current is much over standard I'd look for a shorted electrolytic capacitor (tantal cap...).

Quote
I never found anything getting warmer by touching the components so I don't know if the OP will have any better luck than I.  Maybe my fingers aren't sensitive enough?
Thermal imager could help...
« Last Edit: January 22, 2017, 01:17:24 pm by carl_lab »
 


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