FANUC Alarm SRVO-075 — WARN Pulse not established
Warning- Hardware
- Pulsecoder (encoder)
- Controllers
- R-J3iB / R-30iA / R-30iB
- FANUC class
- WARN
- Hardware family
- FANUC Pulsecoder, backup battery and position loss alarms
Manufacturer wording — WARN Pulse not established(G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-075 (“WARN Pulse not established”): The absolute position of the pulse coder has not yet been established. First check: Jog the robot along each axis for which this alarm is issued, until the alarm is not re- issued after being cleared.
Updated 2026-10-22 · LogrobotLM reference
Description
The absolute position of the pulse coder has not yet been established.
Remedy
Jog the robot along each axis for which this alarm is issued, until the alarm is not re- issued after being cleared.
Field diagnosis
The absolute position of the axis has not yet been re-established; it normally follows a BZAL or a CMAL.
What to check
- Reset, then jog the axis (about one motor revolution, a few degrees) until the code no longer returns; mandatory before any mastering.
- Note: Service observation: after BZAL, RES_PCA, power cycle and QUICK MASTER, a JOINT jog of about ten degrees on each affected axis followed by RESET was enough.
- Diagnostic sequence “Pulsecoder battery sequence”: Complete sequence after loss of position: BZAL (SRVO-062) at power-up, then 075 "position not established" after the encoder reset, then mastering. New batteries with the power on, Pulsecoder reset (RES_PCA or system variable), power cycle, QUICK MASTER if the reference exists (otherwise full mastering), jog of about ten degrees on each affected axis, RESET.
Related codes
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →