
Status LEDs and Test Switch
The ML200 PCI NVRAM module has two status LEDs and a recessed test switch
(see Figure 1).
Battery Charged LED—The green battery charged LED indicates the charge
status of the battery. When the LED is on, the battery is charged to a sufficient
level (2.5 V minimum). When the LED is off, the battery is not charged to a
sufficient level. If the battery is not sufficiently charged when the system is
booted, this LED will not be on and a 24-hour charging cycle begins. If the
battery charged LED is still not on 24 hours after booting the system, the battery
should be replaced.
Battery Enabled LED—The green battery enabled LED indicates whether the
battery can supply power to the SRAMs and whether there is valid data in the
NVRAM. When the LED is on, the battery will supply power to the SRAMs if the
system power fails and valid data is in the NVRAM. When the LED is off, the
battery will not supply power to the SRAMs if the system power fails and there is
no valid data in the NVRAM.
Battery Enabled Test Switch—The battery enabled test switch is a recessed
momentary contact switch that is used to verify whether the battery is supplying
power to the SRAMs and valid data is in the NVRAM when the module is
removed from the system or the system is powered off.
With the module removed from the system or the system powered off, depress
the battery enabled test switch for 1 to 2 seconds and then release. When the
switch is released, the battery enabled LED will be on momentarily if the battery
is supplying power to the SRAMs and valid data is in the NVRAM. If the battery
enabled LED is not on momentarily when the switch is released, then either
there is no valid data in the NVRAM or the battery is discharged.
Caution
The battery enabled test switch should NEVER be depressed while the
module is installed in a powered-up system.
Battery Removal and Replacement
The ML200 PCI NVRAM module contains a 3 V lithium-magnesium rechargeable
battery that provides battery backup for preserving valid data in the NVRAM
when the system loses power or is turned off. This battery should be replaced
only with the same type battery (PN 12-39864-04) or an equivalent (leadless
SANYO ML2430 [90 ma-hr]) battery.
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