23 uk – FBT MPU User Manual
Page 24
23
UK
CONTROLS AND FUNCTIONS
FRONT PANEL
MPU 4240 / MPU 4120 / MPU 4060 / MPU 2120
[1 - 4] AMP 1/2/3/4:
[2] OC:
[3] FAULT:
[5] PWR
OVER CURRENT_
: Indicates that the system is on.
When the LED lights up, the signal is on the relevant amplifier.
when the LED lights up, the current absorbed by a load (and,
hence, the power) is exceeding the current that can be supplied and supported by the line,
or a short-cut has occurred on the line.
When the LED lights up, a component may be broken or the thermal protection
has activated: this can occur due to excessive heat, overcharge or due to a too high audio
signal at an excessively high frequency. In this case, to avoid damages to the power circuits,
the protection activates, temporarily interrupting amplification until optimal conditions are
restored.
MPU 4240
FOUR CHANNELS POWER UNIT
AMPLIFIER 3 / 4
AMPLIFIER 1 / 2
PWR
AMP 2
AMP 1
OC
FAULT
AMP 4
AMP 3
OC
FAULT
1
2
3
4
1
2
3
4
5