Power Entry Module
VCO/4K Power Subsystem 1-7
3.2 Indicator LEDs
There are two LEDs on the front of the power supply module; the power LED on the left side,
and the Ring Generator LED on the right side. Refer to Figure 5.
Power LED
The power LED is on the upper left side of the power supply module. When illuminated, it is
either green or red.
•
Green indicates that the power is on and operation is normal.
•
Red indicates a voltage failure although the interlock switch is closed and the power is
on.
Replace either the fuse or the power supply module. Refer to Section 7.2 for information
on the fuse, and Section 6.1 and Section 6.2 for power supply module removal and
replacement steps.
•
Red could also indicate that you failed to install the external jumper needed for single-
line feed DC operation (refer to Table 2).
•
When the LED is off, or if it glows a faint red (reduced illumination), the interlock
switch is open (power to the module is turned off).
Ring Generator LED
The Ring Generator LED is on the upper right side of the power supply module. When
illuminated, it is either green or red.
•
Green indicates that a ring generator is installed and working correctly.
•
Red indicates a ring generator failure.
•
When the LED is off, there is no ring generator present in that power supply module.
