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).
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.
-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
-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
-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
-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.
-Voltage measurement 100mV at direct out.
SCHEMATIC DIAGRAM
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