
B–62755EN/01
9. TROUBLESHOOTING (SERIAL INTERFACE SPINDLE)
395
Replace PCB .
Item Cause of trouble Check procedure Remedy
1
External data memory
(RAM) defective
Replace memory (RAM).
2 PCB defective Replace PCB.
Item Cause of trouble Check procedure Remedy
1
Program memory
data (ROM) defective
Compare data displayed
when power is turned ON
with ROM labels.
Replace program memory
(ROM).
Item Cause of trouble Check procedure Remedy
1
A/D converter defec-
tive
Replace A/D converter.
2
U-phase current de-
tector circuit defective
After power is turned on,
check if offset voltage on
check terminal IU is be-
yond range of about
"100 mV.
Replace PCB.
3
Loose contact of con-
nectors between PCB
and power circuit
Check connector connec-
tion between PCB and
power circuit.
Ensure that PCB and pow-
er circuit are securely con-
nected with each other.
Item Cause of trouble Check procedure Remedy
1
V-phase current de-
tector circuit defective
After power is turned on,
check if offset voltage on
check terminal IV is be-
yond range of about
"100 mV.
Replace PCB.
2
Loose contact of con-
nectors between PCB
and power circuit
Check connector connec-
tion between PCB and
power circuit.
Ensure that PCB and pow-
er circuit are securely con-
nected with each other.
Item Cause of trouble Check procedure Remedy
1
CNC power supply is
OFF
Check that CNC power is
ON.
Turn CNC power ON.
2
Defective optical
cable for serial data
transmission
Check that optical cable is
fitted securely to the con-
nector. Check that the
cable is not broken.
Check that transmission/
reception surfaces of the
cable are clean.
Connect securely.
Replace optical cable.
Clean optical cable trans-
mission/reception sur-
faces.
3
Defective data trans-
mission/reception ele-
ments in LSI used in
serial data transmis-
sion
Replace LSI.
Replace PCB.
AL–13 CPU internal data
memory alarm
AL–16 RAM abnormality
AL–18 Program ROM
sum check error
AL–19 Excessive U
phase current
detection circuit
offset
AL–20 Excessive V
phase current
detection circuit
offset
AL–24 Serial transfer
data error
AL–25 Serial data
transfer stopped