JBL PARTY BOX 100, Service Manual

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Function Crosstalk 75dB@100Hz
70dB @1KHz
65dB @10KHz
Dynamic range 80dB@1KHz
Input Impedance > 4 Kohm
Residual Noise 1.2mV rms
DC Offset <30mV
Damping Factor >8
Signal Sensing(ATO) at 1 kHz Analog: <5mV ,Typ. 3mV
Digital : < -70dBF
4.1.2 Other Requirements
Short Circuit Protection at Output Stage The amplifier should be protected so that no functional failure
occurs when it is operated with a short across its output stage
for 2 minutes. The amplifier should recover after removing the
short condition.
Over Voltage Protection In case a regulation loop in the unit gets defectives, the output
voltage shall not exceed more than 30% of the nominal value.
Thermal Protection There should not be any breakdown or activation of any
protection circuit during the entire thermal profile test. Refers to
the Thermal Profile test stated in Reliability Test Plan for
Multimedia Powered Speaker System.
Environmental Conditions
The unit should work b5
°
C till 45
°
C under ambient
temperature.
The unit should not get damaged within the temperature range
of +5
°
C till 60
°
C ambient temperature.
4.1.3 Microphone/Guitar input
Mic/Guitar input to speaker
,
set potentiometer to Factory Level(1/4), unless otherwise specified.
Description Specification
Input Sensitivity Mic : 20mV +/- 10%, Guitar : 100mV +/- 10%; fine-tune
potentiometer to meet requirement.
Input Overload Mic : 489mV, Guitar : 1228mV;set potentiometer to Min
Frequency Response (Output Power:-3dB
ROP) Mic : 50Hz~14kHz, Guitar : 50Hz~20kHz,limit -3dB