ADTRAN T200 H2TU-R Installation And Maintenance Manual page 17

If the cabinet has been opened during the day allowing
the heat to escape before proper troubleshooting tests
could be conducted, close the cabinet doors and allow
the cabinet internal temperature to restabilize.
Recheck during the hottest time of the following day
before the outside temperature has a chance to drop.
PRIMARY FAN BOARD
If the primary fan board is believed to be damaged,
check the following in the listed order immediately
upon opening the rear door:
• Power is present at the fan board. (Door LED
turns On as soon as the rear door is opened.) If
the door LED does not turn On, troubleshoot for
lack of power.
• Manually disable the rear door switch and check
the fan LED status:
- If the primary fan LED is Off, the primary fan
should be On.
- If the primary fan LED is On, the primary fan
should be Off.
• If either condition does not exist the primary fan
board is suspect and should be replaced.
SECONDARY FAN BOARD
If the secondary fan board is believed to be damaged,
check the following in the listed order immediately
upon opening the rear door:
• Power is present at the fan board. (Door LED
turns On as soon as the front door is opened.) If
the door LED does not turn On, troubleshoot for
lack of power.
• Manually disable the front door switch and
check the fan LED status:
- If the secondary fan LED is Off, the secondary
fan should be On.
- If the secondary fan LED is On, the secondary
fan should be Off.
• If either condition does not exist the secondary
fan board is suspect and should be replaced.
Open Loop/No Continuity
The primary or secondary Door LEDs will remain Off
when the rear or front door is opened if the respective
primary or secondary power loop has no continuity
(Open) between the cabinet and the FPU.
1. Verify the Central Office FPU is online.
2. Check the LED indication on the FPU.
3. If the FPU is sending power but the cabinet is
61150090L1-5A
not receiving it, check the wiring connections at
both the cabinet and the FPU.
Shorted Loop
The primary or secondary Door LEDs will remain Off
when the rear or front doors are opened if the
respective primary or secondary fan powering loop
has a short across the tip/ring cable pair between the
cabinet and the Central Office FPU.
1. Verify the Central Office FPU is online.
2. Check the LED indication on the FPU.
3. If the FPU is sending power but the cabinet is
not receiving it, check the wiring connections at
both the cabinet and the FPU.
Door Switch Troubleshooting
Door switches can fail in either the Closed or Open
position. The next two procedures will identify the
particular failure. The procedure applies to both front
and rear door switches.
High Voltages are present on exposed pins.
Do not contact exposed surfaces.
Door Switch Failure-Closed
1. Verify with the CO that the FPU is online.
2. Push in and release the door switch.
3. If the Door LED is On, the door switch is not
defective.
4. If the Door LED stays Off, regardless of the
door switch position, proceed with Step 5.
5. Disconnect the JP2 door switch connector on the
fan board by carefully pulling the connector off
the header. DO NOT PULL ON WIRES.
6 If the Door LED turns On, the corresponding
door switch is defective.
7. Follow the door switch replacement instructions
to replace the defective door switch.
Door Switch Failure-Open
1. Verify with the CO that the FPU is online.
2. Push in and release the door switch. The Door
LED should go On.
3. Manually disable the door switch by centering
the rod and pulling outward.
4. The Door LED should go Off.
5. If the Door LED stays On regardless of switch
position, proceed with Step 6.
Section 61150090L1-5A, Issue 1
WARNING
17