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 snipped-for-privacy@Telia.com
Merry Christmas to all of You!!!