Lenovo THINKSERVER 3821 - Manual (Page 148)

Table 8. Power-supply LEDs
Power-supply LEDs
Description Action Notes ac dc Error
Off Off Off No ac power to
the server or a
problem with the
ac power source
1. Check the ac power to the server.
2. Make sure that the power cord is
connected to a functioning power
source.
3. Turn the server off and then turn the
server back on.
4. If the problem remains, replace the
power supply.
This is a normal
condition when no
ac power is present.
Off Off On No ac power to
the server or a
problem with the
ac power source
and the power
supply had
detected an
internal problem 1. Replace the power supply.
2. Make sure that the power cord is
connected to a functioning power
source.
This happens only
when a second
power supply is
providing power to
the server.
Off On Off Faulty power
supply Replace the power supply.
Off On On Faulty power
supply Replace the power supply.
On Off Off Power supply not
fully seated,
faulty system
board, or faulty
power supply 1. Reseat the power supply.
2. If the system board error LED is off,
replace the power supply.
3. (Trained service technician only) If the
system board error LED is on, replace
the system board.
Typically indicates
that a power supply
is not fully seated.
On Off or
Flashing
On Faulty power
supply Replace the power supply.
On On Off Normal operation
On On On Power supply is
faulty but still
operational Replace the power supply.
Internal LEDs, connectors, and jumpers
The illustrations in this section show the LEDs, connectors, and jumpers on the
internal boards. The illustrations might differ slightly from your hardware.
140 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual