Service manual

2-2 AlphaServer 4000/4100 Service Manual
2.1 Control Panel
The control panel display indicates the likely device when testing fails.
Figure 2-1 Control Panel and LCD Display
PK-0706G-96
P0 TEST 11 CPU00
On/Off
Halt
Reset
Potentiometer
Access Hole
• When the On/Off button LED is on, power is applied and the system is running.
When it is off, the system is not running, but power may or may not be present.
If power is present, the PCM or the power LED on the system bus to PCI bus
bridge module should be flashing. Otherwise, there is a power problem.
• When the Halt button LED is lit and the On/Off button is on, the system should
be running either the SRM console or Windows NT. If the Halt button is in, but
the LED is off, the OCP, its cables, or the PCM is likely to be broken.