Maintronic DPA4.150 Service-Handbuch - Seite 14
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14
Fault LED glows:
The amplifier is to hot (heatsink is over 80°) or
a short circuit is present at the loudspeaker outputs
LED should turned off after disconnecting the loudspeaker
Humming noise:
1: Check Input Ground connectors
2: throught the PE conductor connections of different devices
a ground loop can ocure
Signal is distorted:
1. turn down the level input gain
2. reduce and check input signal