Read JBL ES 250PW (serv.man2) Service Manual online
ES250PW Test Set Up and Procedure
Equipment needed:
•
Function/signal generator/sweep generator
•
Integrated Amplifier
•
Multimeter
•
Speaker cables
•
ES250PW Transmitter, power supply
General Unit Function + Transmitter (UUT = Unit Under Test)
1) From a mono output signal generator, OFF at this time, connect an RCA cable to the “Sub in” jack on the
ES250PW Transmitter. Assure the power supply has been plugged in and a Red or blinking Green LED is
now showing on the transmitter. Default “ID Code” switch position is 1.
2) Position and plug in the ES250PW Subwoofer nearby (less than 75’ away), power switch should be OFF.
3) CROSSOVER, PHASE switch position does not matter. Low Pass switch should be OFF. “ID Code”
switch position should be 1.
4) Turn the LEVEL control on the UUT to completely counterclockwise (MIN).
5) Turn on signal generator; adjust to 75mV, 50 Hz. LED on Transmitter should now be steady Green.
6) Turn the power switch ON. LED on top of Subwoofer should be momentarily Green, then Orange.
7) Turn LEVEL control full clockwise (MAX); immediate and vigorous bass response should be heard and felt
from port tube opening on the bottom.
8) Turn off generator, turn LEVEL control full counterclockwise (MIN), and disconnect RCA cable.
General Unit Function (Direct connection - No Transmitter)
9) From a mono output signal generator, OFF at this time, connect an RCA cable to the L/R jacks on the
ES250PW Subwoofer.; Use a Y-cable to connect to both inputs; power switch should be OFF.
10) PHASE switch position does not matter. CROSSOVER control should be set at “150Hz”. Low Pass switch
position does not matter.
11) Turn the LEVEL control on the UUT to completely counterclockwise (MIN).
12) Turn on signal generator; adjust to 75mV, 50 Hz.
13) Turn the power switch ON. LED on top of Subwoofer should be momentarily Red, then Green.
14) Turn LEVEL control full clockwise (MAX); immediate and vigorous bass response should be heard and felt
from port tube opening on the bottom.
15) Turn off generator, turn LEVEL control full counterclockwise (MIN), and disconnect RCA cable.
ES250PW
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