Fluke 8600A Battery / Power Supply Conversion

[PlaneSailing]

Have finished Fluke 8600A battery to line power conversion and attach picture for those interested and contemplating the same.

I located a 5V 40mm fan inside the unit in one of the old dual NICAD battery locations, as was concerned about the 120 degF case temperature over the transformer.  Now with the fan after an hour, max case temp is 95deg.  Not sure if John Fluke would approve of a fan inside one of his small bench meters ?, read Steve Jobs was "anti-fan".  Drilling ventilation holes in the back of the otherwise great shape case felt bad.

"Calibrated" the unit (against 2 other good bench meters) at the 1.9V end points of the 2V (etc) ranges, only to see ~0.2% high reading mid scale.  Surprised a dual slope converter could be non linear ?.
Parts list for the conversion: 2200uF 25V cap for the rectified AC, LM7805 & heatsink, few small decouplers - I noticed the main 5V seems noisy with 9kHz switcher noise and the 2MHz clock feedthrough.   40mm x 40mm 5V fan (Amazon $5), dropped to 4V with a quieter, though adequate airflow with a 22 Ohm 2W resistor off the raw rectified input before the 7805.  Had to cut a few traces - the leaked NICAD acid had already "cut" a few others for me !. Overall a fun project, recommended.

[Paceguy]

Hi PlaneSailing, I am converting my Fluke 8600A from battery ops to line only. I saw your posting in EEV blog from last year and I'm interested to do the same as you did. Would it be possible to post up the the schematic showing the traces that you had to cut. (or that were destroyed by the batt acid)? and the jumpers that you had to add. Thanks!