Sunday, February 08, 2015

JBL PSW-D112 - DPS-12 POWERED SUB WOOFER SCHEMATIC

POWERED SUB WOOFER SCHEMATIC 

A. Power Amp Section
1. Resistance Check Resistance from O/P of the module to GND should be >1M (NO LOAD)
Resistance from V+ of the module to V- of the module should read >5k
Resistance from V+ of the module to O/P of the module should read >1M
Resistance from V- of the module to O/P of the module should read >1M
2. Power Up LED RED
- With a 35mV signal to Low level input, LED should change to GREEN
3. D.C. Operation
-Voltage measurements (DVM).

Between
And
Should be Reading
+6V
V-
+6.2V
V+
GND
+90.1V
O/P
GND
0V
 V-
GND
-90.1V
+15V
GND
 +15.5V
S/D
V-
 +5.75V
 FR
GND
0V
I/P
GND
0V
GND
GND
0V
 -15V
GND
-15.5V

4. Check Switching Frequency
-Use scope (EITHER USES AN ISOLATION TRANSFORMER OR ATTACHES THE PROBE TIP TO SPK- and REFERENCE LEAD TO SPK+)
-Reading 100kHz +/-10%,500mVpp.
B. Pre Amp Section
1. Low Level Input Sensitivity -Set up Turn level and Low-Pass Pot Fully CW Generator set at 100mV@39Hz Signal to Low level input
-Voltage measurements.
OPAMP
U1(14)
271mV
U1(7)
409mV
U1(1)
486mV
U2(8)
471mV
U2(14)
456mV
U2(1)
460mV
U4(1)
2.94V
U4(7)
2.67V
SPEAKER
OUTPUT
17.4V


2. High Level Input Sensitivity
-Set up Turn level and Lo Pass Pot Fully CW Set Generatorat 3.6v@39Hz Signal to High level input
-Voltage measurements 17.4V at speaker out
3. Low-Pass
-Set up Set Generator at 100mV@100Hz Signal to Low level input Measure voltage at speaker output
-Voltage measurement
Low-Pass Pot Setting
Output
CW
12.2V
CCW
1.2V
4. High-Pass
-Set up Set Generator at 100mV@100Hz Signal to Low level input Measure voltage at high-pass output
-Voltage measurement
High-Pass Pot Setting
Output
CW
24mV
CCW
55mV
5. Direct out
-Set up Set Generator at 100mV@100Hz Signal to Low level input
-Voltage measurement 100mV at direct out.
SCHEMATIC DIAGRAM 
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