Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Spezifikationen PDF herunterladen (Seite 43)

Chapter 8

DPU Battery and

Fuse Maintenance

Battery and Fuse Types

The maxDPU4E comes with a single battery and two fuses that may need

attention.

The Model PDP DPU uses a Nickel Cadmium (NiCd) rechargeable battery

pack that must be replaced periodically. The NiCd battery pack, mounted on

the DPU cover, allows the DPU to sustain operation for several seconds after

24V power loss while the current configuration is stored in flash memory.

Non-volatile flash memory maintains the configuration even if power is

totally lost or during brownout conditions. Once the configuration is flashed

during shutdown, the DPU can be serviced for battery replacement without

losing the previous configuration. This battery is tested for one minute every

hour. The DPU will raise a "battery fail" alarm if the battery fails the test. To

replace the battery, see the next section.

The DPU uses two fuses, located towards the upper back edge of the

motherboard, marked F1 and F2. Both fuses are subminiatures resembling

through-hole resistors. Fuse F1, 3A (Part number 014257), is used for battery

power. Fuse 2, 3A (Part number 014257), is used for 24V power. They are

both mounted directly to the board by their leads and plugged into sockets.

To replace the fuses, see "Replacing DPU Fuses."

Caution: The DPU contains devices that can be damaged by electrostatic

discharge. It is imperative that the DPU be carried in antistatic protective

bags. Grounded workstations and wrist straps must be used when adjusting

or performing any work on the DPU. If soldering irons are used, they must

also be grounded.

Replacing the NiCd Battery Pack

Note: when the DPU is shipped or put in storage, always unplug the NiCd

battery pack from the J13 connector.

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Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Spezifikationen Seite 43