JBL EON 515XT No Power On

[x-pro]

What is the voltage between the control points TP601 and TP603 with AC 120V mains supply?
What is the voltage between UBULK and SMPSREF tires?
All these measurements should be made between the indicated points, without touching the body of the device.

[x-pro]

When applying AC120V to the input, the module must be disconnected from the dynamic heads and without an input audio signal.
In this case, you need to make sure that the internal voltage stabilizers work correctly.
In order not to accidentally short-circuit the leads of the parts on the board with the probes of the tester during measurements, pre-solder additional wires with insulated terminals.

[ca7922303]

When applying AC120V to the input, the module must be disconnected from the dynamic heads and without an input audio signal.
In this case, you need to make sure that the internal voltage stabilizers work correctly.
In order not to accidentally short-circuit the leads of the parts on the board with the probes of the tester during measurements, pre-solder additional wires with insulated terminals.

Can you explain in more detail what you mean "module must be disconnected from dynamic heads".

[ca7922303]

Is C645 being subjected to voltage higher than it's voltage rating?

Am I good to go ahead and check voltage at TP601 and ground without replacing last C645 and using internal power, not an external power source? Any need to disconnect module from component board and no speakers/load connected?

[ca7922303]

What is the voltage between the control points TP601 and TP603 with AC 120V mains supply?
What is the voltage between UBULK and SMPSREF tires?
All these measurements should be made between the indicated points, without touching the body of the device.

Not sure what the "tires" in "UBULK and SMPSREF tires" means. Can you define "tires"

[nosaj]

Can you explain in more detail what you mean "module must be disconnected from dynamic heads".

Dynamic heads are probably speakers.. There is a language disconnect from Russian to English but for the most part not to hard to suss out.
nosaj

[nosaj]

Not sure what the "tires" in "UBULK and SMPSREF tires" means. Can you define "tires"

Tires maybe the voltage rails, not quite sure.
nosaj

[The Dude]

Probably an error in Russian translation.

[g1]

I think 'tires' is probably 'lines'.

[g1]

Am I good to go ahead and check voltage at TP601 and ground without replacing last C645 and using internal power, not an external power source? Any need to disconnect module from component board and no speakers/load connected?

Yes just do it right away and then turn off. But check TP601 and TP603. We just want to know if the voltage on C645 is more or less than 63V. It goes between those 2 test points.

[g1]

Maybe x-pro (or someone with more SMPS experience than I) could explain the strange capacitor arrangement of C640,641,643, and 645. It seems to me the job should be able to be done with 2 capacitors.

[ca7922303]

Yes just do it right away and then turn off. But check TP601 and TP603. We just want to know if the voltage on C645 is more or less than 63V. It goes between those 2 test points.

Didn't change C645 again yet and I'm getting(0.8 mvdc) across TP601-TP603.

[x-pro]

sorry, i'm translating by google

Dynamic heads are probably speakers.. There is a language disconnect from Russian to English but for the most part not to hard to suss out.
nosaj

"Tires maybe the voltage rails"

Yes.

[x-pro]

Maybe x-pro (or someone with more SMPS experience than I) could explain the strange capacitor arrangement of C640,641,643, and 645. It seems to me the job should be able to be done with 2 capacitors.

I assume you are technically savvy.
In the cold part of the power supply, or in the secondary circuit, there are integral stabilizers and PWM converters with respect to the required voltages (+15V, -15V, +5V). They have a connection to the body of the device (Common). This is not grounding, which is available in the AC120V network, but sometimes GND-LIFT connects them in other devices.
Therefore, they are powered by capacitors C640, C641 with a midpoint on Common from a pulse transformer.
The output stage of a class D amplifier is powered by voltage without relying on a midpoint.
It receives a voltage of 56V from the capacitor C643, C645 (JBL PRX525). I now have a JBL PRX525 for repair. On TP601/TP603 +/- 28V relative to the module case.
Parallel connection of these capacitors is necessary to better combat interference from the switching power supply conversion (filtering).
A large capacitor value requires some consistent accumulation time for its functional operation. Thus, it does not filter high-frequency interference, parasitic emissions from the power supply well enough. Therefore, a capacitor with a lower rating is placed. It happens that three or four capacitors are installed. It is also permissible to use ceramic capacitors in units, fractions of microfarads.
Another explanation for the parallelism of capacitors. Oxide-electrolytic aluminum capacitor of large denominations poorly absorb high-frequency component currents.

[x-pro]

It receives a voltage of 56V from the capacitor C643, C645 (JBL PRX525). I now have a JBL PRX525 for repair. On TP601/TP603 +/- 28V relative to the module case.

in EON515 in TP601 / 603 should be + -21V