Y-axis scale isn't working on my newly acquired mill. Only 1 set of pulses
is getting to the box (white wire, top). Cable checked OK and wiring at
connection to scale checked OK. Only thing left is inside the scale.
The scale worked intermittently when I checked it out so I was hoping for an
easily found bad wire, but no luck.
Any advise or precautions before I remove the scale from the mill and open
BTW, the Acu-Rite III box wasn't working when I got it. Not dead, just no
good readouts, and sometimes it would take a preset, sometimes not. I
opened it up and found a dual voltage power supply, 5 v and 13.8 v. An
18000 uf 15 VDC cap keeps it going (20 yrs old) .
The 13.8 v is dropped to 10 v across a zener diode. All was well until the
display was lit when I did a zero reset. Then the zener dropped to 8.4 v.
Pulled the 13.8 v pin from the cap to the board and hooked up a 12 v supply
to the board. Steady 10 v at the diode and all worked well. Ordered a new
cap for $10 from mouser.com.
Any help is appreciated.
18 years ago