ADTRAN T200 H2TU-R dimensions TESTING General, Fan Board Indication, Door Switch

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

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.

	Pimary			Secondary
			Thermostat
	Fan Board
				Fan Board
	to Cable A			to Cable A
To Rear						To Front
Door Switch	JP2		JP4		JP2	Door Switch
			JP1
	Rear		Thermostat	Fan LED	Front
		Fan LED		(thermostat)	Door LED
	Door LED	(thermostat)

Figure 13. Primary & Secondary Fan Boards

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