Dynamic Precision DPA 6.4 Manual del usuario - Página 11

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SYMPTOM

Apparatus is put in STANDBY.

Humming sound heard from the

loudspeakers.

No sound, but the indicators are

lit.

DPA 6.4

POSSIBLE CAUSE

1: High frequency noise

2: Problem with the signal cable.

3: DC on the inputs.

4: Overheating.

5: Strong signal clipping.

Degraded/defective shield on the

signal cables.

Fuses (T5A) may be defective.

TROUBLESHOOTING

POSSIBLE SOLUTION

1: Insert a mains filter between

the power amplifier and the

main outlet.

2: Check for proper

grounding/shield of the cables,

or replace the cables.

3: Check if DC is present on

the signal source output.

4a: Check if the loudspeaker

cables are partially short-

circuited, or replace the

cables.

4b: Ensure that the amplifier

has at least 15 cm of free

space on top.

5: Input level is too high.

Check or replace the cables.

Replace the fuses and check

the apparatus for proper

operation. Check if the

loudspeaker cables are wired

correctly and/or if a shortening-

circuit has occurred.

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