JBL E150P, Service Manual, Page: 18 / 31

A. Power Amp Section
Resistance
Check
Resistance from S+ (SPK O/P) to GND should be >1M
Ω
(NO LOAD)
Resistance from V+ (C6 P+) to V- (C8 P-) gradually Fully CHARGED should read >10k
Ω
Resistance from V+ (C6 P+) to S+ (SPK O/P) should read >1M
Ω
Resistance from V- (C8 P-) to S+ (SPK O/P) should read >1M
Ω
2. Power Up LED RED
With a 5mV signal to Low level input, LED should change to GREEN
-Voltage measurements (DVM)
OP AMP
LED
P-U4(1) P-U4(7)
RED 0Vrms 8VDC
GREEN 6.3Vrms -10.7VDC
3. D.C. Operation
-Voltage measurements (DVM) on CLASS D POWER AMP
Between V+ Q4(E) Q1(C)
Q10(C)
U7(1) U7(2) U7(4) U7(6) U7(7) U7(8)
And This
Point
GND V- GND GND GND GND GND GND GND GND
Get this
Reading
45.9V 0V -45.9V 0V -45.9V -45.7V -45.5V 0V 0V 4.7V
4. Check Switching Frequency
•
Oscilloscope -
USE THE PROBE TIP TO U6(7) TO GND
•
Reading /-10%,22Vp-p
B. Pre Amp Section
Line Level Input Sensitivity
-Set up Turn level, X’OVER FREQ POT Fully CW and LFE switch off
Generator Set at 100mV@50Hz
Signal to Line level input
DETAILED TROUBLESHOOTING
17
E150P/P10SW subwoofers