Fanuc Power Mate i-D/H Maintenance Manual

7. TROUBLESHOOTING
B63175EN/03
450
A parity error occurred in the DRAM module.
The DRAM module on the CPU card may be faulty. Replace the DRAM
module.
Watch dog alarm or RAM parity in servo control modul has occurred in
servo control module.
The timer used to monitor the operation of CPU is called the watch dog
timer. The CPU resets timer every time a constant time has passed.
When an error occurs in CPU or peripheral device, timer is not reset but
the alarm is informed.
This is a RAM parity error on the axis control card.
The servo module includes servo RAM, watch dog timer circuit, etc.
Defectiveness of hardware, abnormality or malfunctioning of detection
circuit or the like is considered. Therefore, replace servo control module.
CPU or peripheral circuits may be faulty. Replace the mother board or
CPU card.
Software may not work properly due to failure of memory module.
Change memory module.
CAUTION
When the base PC board or memory module is replaced, all
the data stored in memory is lost. Set data again, referring
to Chapter 3 INPUT AND OUTPUT OF DATA.
7.24
ALARM 912 TO 919
(DRAM PARITY
ERROR)
Cause and
countermeasure
7.25
ALARM 920 AND 921
(WATCH DOG OR
RAM PARITY)
points
D Watch dog timer alarm
D RAM parity error
Causes and Remedies
D Servo control module is
faulty
D Base PC board is faulty
D Memory module is faulty

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