JBL EON 515XT No Treble

[ca7922303]

Tested TDA7293:
1(0mv)
2(1.5mv)
3(1.9mv)
4(0mv)
5(220mv)
6(16v)
7(25v)
8(-25v)
9(8v)
10(8v)
11(-28mv)
12(0.4v)
13(25v)
14(0.1mv)
15(-25v)

[x-pro]

SYSTEM COMPONENTS:
• Baffle/Grille Assembly: 445873-001
• Low Frequency 265F-1 380 mm (15 in) Different-
Transducer: ial Drive® integated woofer with dual
2” voice coils
• DC Resistance: 1.35 ohm ±10%
• High Frequency 2414H 37.5 mm (1 in ) annular poly
mer diaphragm, neodymium com-
Transducer: pression driver
• DC Resistance: 3.60 ohm ± 0.2%

[x-pro]

Use an oscilloscope to check the signal at the TDA7293 input.

[ca7922303]

Use an oscilloscope to check the signal at the TDA7293 input.

I'm assuming oscope with a signal thru input?

[x-pro]

Feed the high-frequency signal from the generator (3 kHz) to the input of the speaker system and use an oscilloscope to look at this signal on pin 3 of the TDA7293 chip or on pin 1 of the U401-A chip.

[ca7922303]

Feed the high-frequency signal from the generator (3 kHz) to the input of the speaker system and use an oscilloscope to look at this signal on pin 3 of the TDA7293 chip or on pin 1 of the U401-A chip.

oscope w/3000hz .30v sine signal.

[x-pro]

this is the way it should be

[ca7922303]

this is the way it should be

Not sure what acoustic input would be, so here's how I have it setup: signal generator @ 3000hz-.30v sine is plugged into input of 515xt. Oscilloscope probe is on pin #3 of tda7293. How does this differ from what you are showing? What reading are you expecting at pin #3 on oscilloscope?

[x-pro]

30 V from an alternator is a lot. 1 V is enough there.
Or you have 300mV??

[x-pro]

Not sure what acoustic input would be, so here's how I have it setup: signal generator @ 3000hz-.30v sine is plugged into input of 515xt. Oscilloscope probe is on pin #3 of tda7293. How does this differ from what you are showing? What reading are you expecting at pin #3 on oscilloscope?

almost the same signal voltage should be on pin 3, and the same frequency

[x-pro]

If this is not observed on pin 3, you should look at pin 1 of U401-A

[ca7922303]

30 V from an alternator is a lot. 1 V is enough there.
Or you have 300mV??

.30v(30mv)

[x-pro]

So what's on pin 3 of the TDA7293?

[ca7922303]

Ch 1 oscilloscope probe was reading (3.9v vpp).

[x-pro]

of the same frequency?
And what is the output of the TDA7293?