JBL EON15 G2, Technical & Service Manual

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EON15-G2
Final Test Procedure
INITIAL POWER UP TEST
Setup—Serially connect a variac, isolation transformer and ammeter. Connect unit under test to variac.
Mic /Line switch should be Line position. Volume control at fully CCW position and no load.
•
Slowly increase the variac output voltage monitoring for excessive current usage
•
Idle current should be less than .5 amps
•
Power Green lED ( FP ) should be illuminated
GAIN TEST
Setup---Monitor LF and HF output on oscilloscope with 8 Ohm load, volume CCW
•
Apply –20 dB at 80 Hz sine wave from generator to the “ XLR” input 1.
•
Increase volume control fully CW. LF Output signal should be 25 dB,
±
1 dB.
•
Change sine wave frequency to 10 kHz. HF Output signal should be 26 dB,
±
1 dB.
INPUT 2 & 3
Setup---Monitor HF output on oscilloscope with 8 Ohm load, volume CCW
•
Apply –20 dB at 10KHz sine wave from generator to the “ 1/4” Jack input 2
•
Rotate the volume control (VR2&3) and verify smooth level change with no intermittent output.
•
Repeat test for input 3
OUTPUT POWER TEST
Setup---Monitor LF Output
•
Apply 80 HZ to input 1 and increase gain from generator until the peak LED begins to
illuminate.
•
The output voltage, at this point, should be approximately 18.5 Volts (AC).
•
Perform the same test for “ HF ” Output with 10Khz on input 1.
•
The output voltage, should be approximately 15 Volts (AC).