
B–62835EN/01
8.TROUBLESHOOTING
329
CPU error (illeagal interrupt) has generated.
1) Base printed board is faulty
An interrupt which will not occur during usual operation has
generated.
Peripheral circuit of the CPU may be abnormal. Change the base
printed board. If operation is performed normally by power off and
on, noise may be a cause. Refer to Subsec.2.2.3. Suppressing Noise.
2) Memory is faulty
Replace PCB including the memory. For location of memory see the
section of alarm 910 to 911.
3) Defective CPU module
Replace the CPU module. (Power Mate–D/B001, B520)
When replacing the CPU module, the memory module must be
removed then re–mounted. Observe the following precaution.
(1) (2)(3) (4) (5) (6) (7)
(3) CPU module
A20B–2901–0500
CAUTION
If the base printed–circuit board is replaced, or the memory
module is removed then remounted, all data in memory will
be lost. Set data again, referring to chapter 3 ” Data
input/output”.
8.33
ALARM 930
(CPU ERROR)
Causes and Remedies