Trouble Shooting; Technical Specifications - Beyerdynamic A 1 Bedienungsanleitung

A 1 – Trouble Shooting
6.

Trouble shooting

Problem
The amplifier does not work. The
Power LED does not illuminate
although the A 1 is connected to
the mains.
Although the headphone is properly
connected there is no sound. The
Power LED illuminates green.
7.

Technical specifications

Input impedance . . . . . . . . . . . . . . . . . . . . . . . 50 kΩ
Maximum amplification . . . . . . . . . . . . . . . . . . 18 dB
Frequency response . . . . . . . . . . . . . . . . . . . . . 1 Hz - 100 kHz (-1 dB)
T.H.D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.001% at 170 mW / 250 Ω
Channel separation . . . . . . . . . . . . . . . . . . . . . > 89 dB
Output power
Unweighted signal-to-noise ratio . . . . . . . . . . . > 100 dB
Output impedances . . . . . . . . . . . . . . . . . . . . . Line Out (depending on the connected device),
Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . 220 to 240 V
Power consumption . . . . . . . . . . . . . . . . . . . . . < 15 W via internal, controlled power pack
Audio connections . . . . . . . . . . . . . . . . . . . . . . Headphone socket,
Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 x 225 x 50 mm
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx. 2.3 kg
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Possible cause
The internal fuse is probably blown.
Different source selected, volume
turned to minimum or defective
cable.
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100 mW / 600 Ω
170 mW / 250 Ω
150 mW / 30 Ω
100 Ω headphone output
1 Line output,
2 Audio inputs (gold-plated RCA sockets)
Solution
Unplug the power cable of the A 1,
before changing the fuse. The fuse
holder is directly next to the
mains connection. Pull the small
cover and replace the fuse (5 x 20)
by the same type 230 V, 0.1 A,
slow.
Check the selected audio source
and the cabling on the rear of the
A 1. Make sure that the volume is
not turned too high, as sudden
high volumes may occur which can
damage your hearing.
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