Service manual

Always On UPS Systems Inc
64
Table 23.1 LED Operation for the 3T PCB
NORMAL ABNORMAL
PCB FUNCTION LOCATION
PCB LED
LED
Illumination
Description
LED
Illumination
Description
SOLUTION
Ensure cable connections are
secure and correctly attached.
3R
Communication
Interface
PCB Module LED R1 Yes PCB has power No
Interface
communication failure
Replace the board
LED R1
Picture 23.1
3R PCB
(
Communications Interface
)