A parity error has occurred in the SRAM used for data backup.
If the alarm is issued immediately after the power is turned on, turn off
the power, then turn it on while holding the
keys to clear
all SRAM memory contents.
If the parity alarm still exists even after the memory all clear operation,
the memory module or base PC board may be faulty. So, replace the
SRAM module or base PC board.
A battery alarm is issued if the voltage level drops to TYP 2.5 V (2.3 V
to 2.7 V) or lower when the voltage rating is 3.0 V.
When the voltage of the memory backup battery has lowered, “BAT”
displays at the bottom of the screen.
When the battery alarm is turned on, replace the battery with a new lithium
battery as soon as possible.
D Replace the battery according to Section 2.8
If an alarm condition can be reset by clearing the entire memory, it is likely
that the backup circuit is defective. Replace the base printed–circuit
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”.
ALARM 910, 911
D SRAM module is faulty.
Stored data is faulty.
D Voltage drop in the
memory backup battery
D The base PC board is