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5. Troubleshooting
The amp does not work, power switch is not illuminated
• Check if the power cord is plugged in the “Main Power”-socket and the power switch 1 is switched on. It is necessary that you
activate power switch 1 first. Note that the power cord must be connected to the AC wall socket as well.
• Disconnect the power cord and check the primary fuses on the rear side of the amplifier (mbl 9011/9008 A: next to the power
switches, mbl 9007: next to the power cord connector). To open the fuse holder take a screwdriver, insert it in the slide of the
safety lock, push and turn a quarter of a rotation. Now take o the cover. Remove the fuse, check it, and exchange, if necessary.
Fuse type and value see “Mains Voltage”. If the spare fuse blows too, please contact your dealer or service department.
Danger! Before removing/installing any fuses, switch o the power amplifier and disconnect it from the mains circuit!
No music
• Check if the standby switch is in the “standby” position.
You hear music, but something is wrong
• Check if you plugged in more than one inputs (symmetric and RCA). Disconnect all inputs that are not in use. See also “Con-
necting power amplifier to preamplifier”.
• Check if the speakers have been connected correctly. See also “Connecting power amplifier to speakers”.
• In case there is not enough power output, you should check, whether you have activated the sucient number of power
switches to control the speaker load.
Power switch is illuminated, no music or distorted music
Attention! Only authorized MBL-dealers may proceed with the following!
Check the secondary fuses inside the amp:
• Disconnect power cord(s) first!
• Remove the 4 screws on the left side panel (looking from the front). Lift the side panel.
• Remove the fuses from the fuse holders and exchange them, if necessary.
In all instances of malfunction please contact your local MBL dealer first.
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a
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