Alpha Microsystems Eagle 250 Посібник з експлуатації - Сторінка 11
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Remote Reset Capability
The AM-138 board has an option to enable remote hardware reset, either through serial port 0, or by
using the Remote Reset Adapter, PDB-10323-00.
You cannot use remote reset through port 0 if port 0 uses an AM-90 card for its back panel
connection; the AM-90 does not support this feature. If you use an AM-90, which is optional on
newly-purchased Eagle 250s and recommended for upgrades, you must use the Remote Reset
Adapter if you want remote reset ability.
To enable remote reset through serial port 0, you must do two things:
1. Install the JP1 jumper. The factory default is not installed.
2. Connect a push-button switch between pin-1 and pin-7 (signal ground) at the terminal end of the
terminal cable attached to serial port 0.
Once you've enabled remote reset, you can reset the computer by activating the push-button switch.
The remote reset adapter allows you to reboot the computer from anywhere in your facility by wiring an
external switch to the location you want. To install the remote reset adapter, follow the instructions in
PDI-10323-00. The JP1 jumper must not be installed. Attach the adapter's single-wire connector to the
connector labeled RESET at location P8. Attach it to the pin away from the edge of the board.
Replacing the Time and Date Battery
When replacing the backup batteries, always be sure to power-down the system first! DO NOT
replace the batteries with the power on! As always when opening your computer chassis, take
proper precautions against electrostatic discharge, which can seriously damage system
components.
The AM-138 board uses two 3-volt lithium batteries (BR-1225) to provide power to its time/date circuit.
The batteries are no bigger than a dime (1.2 cm), and are secured side-by-side in a plastic holder at
location U17, as shown in Figure 5.
The batteries need to be replaced when the status panel displays B1 or B0. You must replace both
batteries at the same time. For battery replacement, please follow these steps:
Before turning off your computer, write down the current CMOS settings. Removing the batteries
will erase all CMOS data.
1. Insert a knife with a thin blade (such as a small scribe or Xacto™ knife) from the top, down
through the square hole between the right edge of the battery and the plastic holder's top piece.
(The right side is the side toward C31.)
2. Gently pry the right side of the battery so it slides to the left and pushes against the left side
spring contacts.
3. As you slide the battery to the left and it clears the plastic top hole, pry the right edge of the
battery upward and out through the hole in the top. The battery will typically "pop" up and out.
Eagle 250 Service Manual
Rev. 01