WTB: FLUKE 8600A IC

B

Bo-Lennart

Guest
Hi, all out there...
I'm have just bought an broken FLUKE 8600A bench-multimeter.
When I power it up, just one digit or all 4 digitpoints lit up. And a
relay is buzziring.
I'll checked the voltage inside the unit.
I found that the +15/-15 volts was very low. About +8 and -1.6 volts.
I pull out the big IC, U8, and there I have my voltage back as they
should be.

So I strongly beleave that the 40-pin IC is bad.
It's labeld : MPS7107 and dated 7505.
In a schematic I got for the instrument, it say "Custom CMOS DVM
chip", so it's not a standard component.
Is there someone out there have such a IC in there junk-box, and want
to sell it to me?
Pls send me an email if You got it.

With the very best regards from SWEDEN

Bo-Lennart Karlsson
Bo-Lennart.Karlsson@Telia.com

Merry Christmas to all of You!!!
 
Bo-Lennart wrote:

Hi, all out there...
I'm have just bought an broken FLUKE 8600A bench-multimeter.
When I power it up, just one digit or all 4 digitpoints lit up. And a
relay is buzziring.
I'll checked the voltage inside the unit.
I found that the +15/-15 volts was very low. About +8 and -1.6 volts.
I pull out the big IC, U8, and there I have my voltage back as they
should be.

So I strongly beleave that the 40-pin IC is bad.
It's labeld : MPS7107 and dated 7505.
In a schematic I got for the instrument, it say "Custom CMOS DVM
chip", so it's not a standard component.
Is there someone out there have such a IC in there junk-box, and want
to sell it to me?
Pls send me an email if You got it.

With the very best regards from SWEDEN

Bo-Lennart Karlsson
Bo-Lennart.Karlsson@Telia.com

Merry Christmas to all of You!!!
Click to expand...
First check all the electrolytic capacitors in the supply,
i have had a 8600A that also behavies very odd and a relay was buzzing
and the only failure was a defective elyt.
Even the low voltage reading you mentioned speaks therefore,
you are measuring a median value of the "pulsating DC"...

Jorgen
dj0ud
 
Bo-Lennart wrote:

Hi, all out there...
I'm have just bought an broken FLUKE 8600A bench-multimeter.
When I power it up, just one digit or all 4 digitpoints lit up. And a
relay is buzziring.
I'll checked the voltage inside the unit.
I found that the +15/-15 volts was very low. About +8 and -1.6 volts.
I pull out the big IC, U8, and there I have my voltage back as they
should be.

So I strongly beleave that the 40-pin IC is bad.
It's labeld : MPS7107 and dated 7505.
In a schematic I got for the instrument, it say "Custom CMOS DVM
chip", so it's not a standard component.
Is there someone out there have such a IC in there junk-box, and want
to sell it to me?
Pls send me an email if You got it.

With the very best regards from SWEDEN

Bo-Lennart Karlsson
Bo-Lennart.Karlsson@Telia.com

Merry Christmas to all of You!!!
Click to expand...


get the manual here:

http://bama.edebris.com/manuals/fluke/8600a/

Jorgen
dj0ud
 
Bo-Lennart (bo-lennart.karlsson@telia.com) writes:
Hi, all out there...
I'm have just bought an broken FLUKE 8600A bench-multimeter.
When I power it up, just one digit or all 4 digitpoints lit up. And a
relay is buzziring.
I'll checked the voltage inside the unit.
I found that the +15/-15 volts was very low. About +8 and -1.6 volts.
I pull out the big IC, U8, and there I have my voltage back as they
should be.

But the two contradict each other. If the IC is bad, it's not likely
Click to expand...
to show as much as some display.

On the other hand, if the power supply is bad, then that is bound to
cause things to not work. Just because the voltage drops when the
IC is in place does not mean the IC is bad. It can mean the power
supply is bad, and when a load is placed on it, it's unable to supply
the needed power. Thus the rest of the unit is unable to function
properly.

YOur problem is you think you need an IC that is likely hard to get.
But you've not really determined that the IC is the problem, you
merely think it is. Far better to do more work at this point to
actually get a better idea of the problem, before trying to track
down an IC that may be expensive and likely hard to get. At worst,
you've spent time ensuring that you really need it. At best,
you'll determine you don't need the IC.

Michael
 
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