Read JBL E 150P (serv.man14) Service Manual online
E150P
Testing Procedure
- Voltage measurements
OP AMP
U2(1)
U2(14)
U2(8)
U3(7)
U3(1)
U3(14)
U3(8)
U5(7)
U5(1)
SPEAKER
O/P
133.6mV
200.2mV
245.9mV
314.8mV
314.9mV
350mV
1.67V
1.452V
2.098V
15.3V
2. High Level Input Sensitivity
-Set up
Turn level, X’OVER FREQ POT Fully CW and LFE switch off
Set Generator at 1.15V@50Hz
Signal to High level input
-Voltage measurements 15.3V at speaker output
3. Low-Pass
-Set up
Set Generator at 100 mV@100Hz
Signal to
Line
level input
Measure voltage at S+ speaker output
-Voltage measurement
X’OVER FREQ. Setting
Output
CW
10.72V
CCW
2.165V
4. LFE
-Set up
Set Generator at 100mV@200Hz
Signal to
Line
level input
Measure voltage at S+ speaker output
LFE switch Setting
Output
Normal
2.9V
LFE
7.62V
See flow chart next page for diagnostics.
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