Mitsubishi Electric A173UHCPU User Manual page 117

5. INSPECTION AND MAINTENANCE
Replacing battery
Turn off the CPU module power supply.
Open the CPU module front cover.
Pull battery out of holder.
Remove leads from lead clip.
Disconnect the lead connector.
Insert new battery into the holder in
the correct direction. Connect the lead
connector. (Clamp leads with the lead
clip. )
(Red lead is positive, blue lead is
negative.)
Close CPU module front cover.
Turn on CPU module power supply.
Check M9006
Battery defective
IMPORTANT
Some components mounted on the printed circuit board are sensitive to static electricity. Take the
following precautions before directly handling the printed circuit board:
(1) Ground your body or the work bench.
(2) Do not directly touch the conductive parts or electrical components in the product.
Dispose of batteries according to local government regulations.
(b) Replacing a battery
Follow the procedure below to replace a battery when its life expires. After the
battery is disconnected, a capacitor maintains memory back-up for a short time.
Complete the battery change operation within the time specified in Table 5.5 or
the memory contents may be lost.
Battery
connector
OFF
ON
Table 5.5 Capacitor Back-Up Time
Guaranteed Time
End
CAUTION
5 − 6
Capacitor Back-Up Time (Min.)
Actual Time
(Minimum) (Typical)
5 15
CPU module
A6BAT
(lithium
battery)