A1 System Status Indicators
Located on the right hand side of the front panel are three LEDs. They are used to indicate the sta-
tus of the A1 amplifier.
P - Power LED (green) - indicates the A1 amplifier is on and in a ready condition.
S - Standby LED (amber) - indicates the A1 amplifier is in "standby" mode.
F - Fault/Protection LED (red) - indicates the A1 amplifier is in a fault condition.
Fault/Protection: The A1 can go into Protection mode for several reasons. A common reason is that the speaker output
wires have been shorted together. Another could be that the amplifier has overheated. Should either of these conditions
occur, repairing the cause of the output short or allowing the amplifier to cool will solve the problem. To reset the A1, turn
the power switch (rear panel) off and then on. If the problem persists, contact your NHT dealer.
A1 - Replacing the Fuse
The A1 amplifier's fuse is user-serviceable.
To replace the fuse:
1.
Turn the power off.
2.
UNPLUG the power cord from the wall outlet and the A1.
3.
Remove the fuse holder cover (next to power cord) with a flat blade screwdriver.
4.
Remove the fuse from holder and replace it with the appropriate type.
5.
Reinstall the fuse holder.
Always replace the fuse with one of the exact same specifications.
For systems operating at 115VAC, use only a 5x20 mm, T5AL, 250V slow-blow fuse.
For systems operating at 230VAC, use only a 5x20mm, T2.5AL, 250V slow-blow fuse.
A1 - Changing the Line Voltage Setting
The A1 was designed to operate on two line voltage settings, 115VAC and 230VAC. In the event
that it is necessary to change the line voltage setting, begin by turning the power switch to the off
position. Remove all the connections from the amplifier, including the detachable power cord.
Using a flat blade screwdriver, slide the switch to the correct position. Use the 115VAC position for
110 to 120 VAC, and the 230VAC position for 220 to 240 VAC. Next you will likely need a power
cord that fits the AC receptacle and you will need to replace the fuse (see "Changing the Fuse" above).
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