Marsh Sound Design A-400 Stereo Power Amplifier - Manual (Page 13)

Marsh 13
If the unit does not function properly, please check the list below and follow the instructions.
If the problem still occurs, please contact our service department.
PROBLEM
1. Unit does not turn on.
The LED is not lit.
2. No sound.
3. No sound from one speaker.
4. Low bass sound.
SOLUTION
Confirm that the power cord is plugged in
properly.
Check If the fuse is still good.
Check the speaker cable connection.
Check the interconnect cable connection.
Check the setting of the input selector
switches at the rear panel. They must be set
according to the type of input (Balanced or
Unbalanced) being used.
Check the speaker or interconnect cable
connection.
Check the BALANCE control on the
preamplifier, make sure that it is in the
middle position.
Check the speaker cables for correct phase
connection.
Troubleshooting Guide