WTB: FLUKE 8600A IC

[Bo-Lennart]

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
[email protected]

Merry Christmas to all of You!!!

 

[Jorgen Lund-Nielsen]

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
[email protected]

Merry Christmas to all of You!!!

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

 

[Jorgen Lund-Nielsen]

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
[email protected]

Merry Christmas to all of You!!!

get the manual here:

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

Jorgen
dj0ud

 

[Michael Black]

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
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

 

[doug]

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
[email protected]

Merry Christmas to all of You!!!

Hello, I think your 40pin i.c. is simply an ICL7107 multimeter display
driver for leds,the equivalent for lcd would be the ICL7106.

I think INTERSIL amongst others,make/made this i.c.

regards doug. in U.K

 

[Michael Black]

Hello, I think your 40pin i.c. is simply an ICL7107 multimeter display
driver for leds,the equivalent for lcd would be the ICL7106.

I think INTERSIL amongst others,make/made this i.c.

But why do you think that? Merely because it was a popular voltmeter IC
does not mean it's what is used. Fluke is a big enough test equipment
manufacturer that it seems likely that it is worth their while to use
custom ICs. Let's not forget that the Intersil IC is thirty years old,
and is merely a voltmeter IC. It takes a fair amount of external circuitry
to make it into an actual DMM, and when making a lot of DMMs it's usually
worth getting as much integration as possible. What was ground breaking
in '77 or '78 isn't groundbreaking 30 years later.

I've never opened one of those $9.95 DMMs with wired in test leads and flat
as possible but I doubt they would use a voltmeter IC that requires a bunch
of other ICs to get a complete set of functions. And if they can get it
all into a blob of epoxy, there's even less reason for Fluke to use
multiple ICs.

That said, your suggestion isn't completely bad. Because again, it's
always worth putting in some time before trying to track down an expensive
and hard to get IC. So the original poster can go through known voltmeter
ICs, and see if there is any common ground between the "sample circuit"
in the datasheets and the actual meter. A quick glance will say one way
or another, it's when there is a match on some analog component (since
those are few they are an easy way to check) that more work is required,
because then one has to see if the premise actually goes all the way.

Michael

 

[JW]

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
[email protected]

Merry Christmas to all of You!!!

Here's one for 40 bucks buy-it-now.
http://cgi.ebay.com/FLUKE-8600A-DIGITAL-MULTIMETER_W0QQitemZ290164936064QQcmdZViewItem

On the plus side you'd then have a parts unit to pick from.
On the minus side you'd need someone to buy it for you, as the guy will
only ship to US or Canada.

 

[Ecnerwal]

....

Here's one for 40 bucks buy-it-now.
http://cgi.ebay.com/FLUKE-8600A-DIGITAL-MULTIMETER_W0QQitemZ290164936064QQcmdZ
ViewItem

On the plus side you'd then have a parts unit to pick from.
On the minus side you'd need someone to buy it for you, as the guy will
only ship to US or Canada.

Heck, I've got an 8600A I'd sell for $30 (whole thing, you can pull the
chip yourself), but I'm darned if I know how I'd get it shipped to
Sweden. I suppose I could pull the chip and stick it in an antistatic
bag to make the shipping less, but there's still the hassle (customs and
what-not) and cost of getting it shipped at any size. Looks like more
than $45 to ship a half-pound (quarter kilo) from here to there. Seems
rather expensive for fixing a 32 year old 3.5 digit meter, especially if
the chip does not turn out to be the whole problem.

 

[legg]

Hello, I think your 40pin i.c. is simply an ICL7107 multimeter display
driver for leds,the equivalent for lcd would be the ICL7106.

I think INTERSIL amongst others,make/made this i.c.

regards doug. in U.K

I checked. Different pinout and function.

RL