Jumper Settings
12
Troubleshooting Cisco 3800 Series Routers
OL-5972-01
ErrorMessage System detected thermal warning on SYS PS 1|2. System is close to auto
shutdown limit.
Explanation The power supply is operating at an abnormally high temperature.
Recommended Action Make sure that the ambient room temperature does not exceed 40 degrees C
and that air flow to the router is not blocked. See the “Site Environment” section on page 4 and the
“Equipment Racks” section on page 5 of “Preinstallation Requirements and Planning for
Cisco 3800 Series Routers.”
The power supply fan may have failed or be about to fail. Replace the power supply. See “Installing
and Upgrading Internal Components in Cisco 3800 Series Routers.”
If this condition persists, the power-supply thermal monitor automatically shuts down the router.
Call your Cisco technical support representative for help, if necessary.
Error Message System detected SYS PS 1|2 fan fail condition.
Explanation
The fan on the indicated power supply has failed.
RecommendedAction Replace the power supply. See “Installing and Upgrading Internal Components
in Cisco 3800 Series Routers.”
Error Message There is more than one failure with power system 1|2 or this power
system has been turned off.
Explanation Multiple failures have occurred in the indicated power supply. This message can also
appear if you have installed two power supplies in a Cisco 3845 router, but only one is powered on.
Recommended Action If the power supply is turned off, turn it on. If it has failed, replace it. See
“Installing and Upgrading Internal Components in Cisco 3800 Series Routers.”
Jumper Settings
If a ROM monitor failure occurs, you may need to change a jumper setting on the motherboard so the
router can boot for troubleshooting. Procedures for accessing the motherboard are described and jumper
locations are shown in “Installing and Upgrading Internal Components in Cisco 3800 Series Routers.”
You may need to set one of the following jumpers:
• DUART DFLT—Sets the console connection data rate to 9600 regardless of user configuration
Change this setting if the console displays garbage characters. The jumper forces the data rate to a
known good value.
• BOOT DFLT—Boots from the read-only boot image in case an upgrade is corrupted
Change this setting if the router consistently hangs or crashes after a ROM monitor upgrade.
• WDOG DIS—Disables the watchdog timer
If you change either of the first two settings as shown, the router stays in the new configuration during
subsequent power cycles and the jumper can be removed.
(340 pages)
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