
Configuring the Meridian 1 12-5
Replacing the CPU ROM daughterboard
Standard 1.0 Modular Option EC Installation and Maintenance Guide November 1999
Replacing the CPU ROM daughterboard
Single-CPU Meridian 1
To replace the CPU ROM daughterboard on a single-CPU
Meridian 1, follow these steps. (Service will be interrupted
during this procedure since you need to power down the
Meridian 1.)
Dual-CPU Meridian 1
To replace the CPU ROM daughterboard on a dual-CPU
Meridian 1, follow these steps. (Use Overlay 35 to ensure the
system is operating on the other CPU. The LED on the CPU
card, when lit, indicates a CPU that has been disabled or is not
currently in use.)
Step Action
1 Power down the Meridian 1 system.
2 Remove the CPU card and replace the daughterboard (located
on the component side of the CPU pack).
3 Reinsert the CPU card.
4 Power up the Meridian 1 system.
Step Action
1 Place the active CPU in maintenance mode using the faceplate
switch.
2 Disable the inactive CPU using the faceplate switch.
3 Remove the inactive CPU card and replace the daughterboard
(located on the component side of the CPU pack) with the
correct version.
4 Reinsert the CPU card.
5 Reenable the CPU card, using the faceplate switch.
6 Load Overlay 35 and use the TCPU command to test the
inactive CPU and new ROM.
If the response is anything other than OK, refer to the
X11 Input/Output Guide
(NTP 553-3001-400).
7 Take the active CPU out of maintenance mode.
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