Testing; Figure 13. Primary & Secondary Fan Boards; Description - ADTRAN T200 H2TU-R Installation And Maintenance Manual

3. TESTING

General
Each test identifies a particular malfunction. For that
reason associated components used to isolate a
malfunction are assumed to be functioning correctly.
Certain troubleshooting requires personnel at both the
Central Office to monitor the FPU, and field personnel
at the cabinet to determine if a fault condition exists.
Refer to Figure 13 to identify fan board component
locations.
Fan Board Indication
Each fan board has two status indicator lights:
• DOOR (Red) LED (Power and Door Alarm
indication)
• FAN (Green) LED (Thermostat position)
Door Switch
Front and rear door switches are identical. The
following description applies to both. The door switch
responds to three conditions:
• Door closed
• Door open
• Manual override
When the door is closed the switch contacts are closed
allowing power to the fan.
When the door is opened the switch contacts open
securing power to the fan. Board circuitry recognizes
the condition and sends a door open "intrusion
To Rear
Door Switch
JP2
61150090L1-5A
Pimary
Thermostat
Fan Board
to Cable A
JP1
Rear
Fan LED
Door LED (thermostat)
Figure 13. Primary & Secondary Fan Boards
Section 61150090L1-5A, Issue 1
notification" alarm to the FPU at the CO, and also
turns the door LED On at the corresponding fan
board.
Manual override is electrically identical to the door
closed condition.
During cabinet maintenance the manual override (or
closing the door) resets the alarm at the FPU.
Indication that the alarm has reset is by the
corresponding door LED turning Off.
Verify Power at the Fan Boards
Power is present at the corresponding fan board if the
red Door LED comes On when the door is opened.
Verify that the primary fan board is receiving power:
1. Push-in and release the rear door switch.
2. If the primary fan board Door LED goes On, the
primary fan board has power. At the CO the
FPU Door Alarm LED will turn red.
3. Disable the rear door switch by centering the rod
and pulling outward. The primary fan board
Door LED should go Off and the Door Alarm
LED at the FPU will turn green.
Verify that the secondary fan board is receiving
power:
1. Push-in and release the front door switch.
2. If the secondary fan board Door LED turns On,
the secondary fan board has power. At the CO
the FPU Door Alarm LED will turn red.
Secondary
Fan Board
to Cable A
JP4
Fan LED
Thermostat
(thermostat)
To Front
Door Switch
JP2
Front
Door LED
15