AEC IST5 Series, Service Manual

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6. First turn the maintenance switches OFF and sees if the inputs of the devices are
connected to each other.
7. Then turn the maintenance switch ON and check the connection between the input of
the first device and the output of the second device.
8. Use separate sets of batteries for each device. Do NOT use the same set of batteries on
more than one device at the same time.
9. Connect the communication cable and secure the connections.
10. Check the termination resistors on the connection cable.
11. Remove the UPS top panel and reach the main board.
12. Find the J9 socket on the main board, and check the resistance between pin 2 and pin 3
using a multimeter. (60Ω)
13. Check the resistance between pin 4 and pin 5. (60Ω)
14. Close the replace the UPS top panel. Turn on the device.