If the control crashes or you get a "RAM Parity" error, the manual walks you through holding - and . while powering on.
Disclaimer: Always refer to your specific FANUC 15M manual and machine builder's supplements before performing maintenance. Electricity is dangerous, and batteries are hungry.
The 15M uses static RAM backed by batteries. When those batteries die, you don't just lose your offsets; you lose the PLC ladder and custom macros . Without a backup, your machine becomes a very heavy boat anchor. fanuc 15m maintenance manual
If the battery dies completely and you lose parameters, typing in the standard 00000000 won't work. You need the original machine build sheet.
Do not perform "Clearing ALL RAM" unless you have a full SRAM backup. If you do this, the machine forgets it is a milling machine. You will have to re-enter every parameter from the yellow books (PMC and CNC). 5. The 9000 Series Parameters (The Keys to the Kingdom) Hidden deep in the manual’s parameter list are the Option Parameters (9000–9099) . These turn on features like rigid tapping, helical interpolation, and additional axes. If the control crashes or you get a
Over 30 years, the electrolyte dries out. You will eventually turn on the machine and see a blank screen or a "System Error." The manual will tell you to check input voltage. But the veteran knows: Recap the power supply.
Change batteries with the power ON. (Yes, on. Static discharge is a killer). Pro Tip: The manual specifies 3V Lithium (BR-2/3A or equivalent). Buy a 5-year supply. Change them every New Year’s Day, regardless of voltage. 2. The "Yellow Cap" Capacitor Plague Flip to the section on the Power Supply Unit (PSU) . The manual has a nice diagram of the board. Look at the large electrolytic capacitors. Electricity is dangerous, and batteries are hungry
The cooling fans in the main cabinet are usually the size of a computer fan and spin at 10,000 RPM. They fail silently. When they fail, the board cooks itself.