A new amplifier came to my work bench ..
Well, when connected, normal blue led, as if nothing happened ..
there is no railway voltage or square waveform.
Check some main components, without finding anything strange, it is as if there were some diode or driver open or leaking ...
Any suggestions?
Well, when connected, normal blue led, as if nothing happened ..
there is no railway voltage or square waveform.
Check some main components, without finding anything strange, it is as if there were some diode or driver open or leaking ...
Any suggestions?
Attachments
IC 701 TL494
pin 1: 4,16
pin 2: 4,98
pin 3: 0,064
pin 4: 4,98
pin 5: 1,49
pin 6: 3,49
pin 7: 0
pin 8: 12,88
pin 9: 0
pin 10: 0
pin 11: 12,88
pin 12: 12,88
pin 13: 4,98
pin 14: 4,98
pin 15: 7,79
pin 16: 4,98
pin 1: 4,16
pin 2: 4,98
pin 3: 0,064
pin 4: 4,98
pin 5: 1,49
pin 6: 3,49
pin 7: 0
pin 8: 12,88
pin 9: 0
pin 10: 0
pin 11: 12,88
pin 12: 12,88
pin 13: 4,98
pin 14: 4,98
pin 15: 7,79
pin 16: 4,98
pin 1: 0,095
pin 2: 4,98
pin 3: 4,98
pin 4: 2,67
pin 5: 4,78
pin 6: 4,96
pin 7: 2,41
pin 8: 2,41
pin 9: 4,72
pin 10: 3,11
pin 11: 4,78
pin 12: 0
pin 13: 4,98
pin 14: 4,98
pin 2: 4,98
pin 3: 4,98
pin 4: 2,67
pin 5: 4,78
pin 6: 4,96
pin 7: 2,41
pin 8: 2,41
pin 9: 4,72
pin 10: 3,11
pin 11: 4,78
pin 12: 0
pin 13: 4,98
pin 14: 4,98
For pins 6 and 7, does one immediately go to the final voltage while the other slowly increases to the final value?
You'll have to be watching from the time remote is applied.
Do you get the same voltages with no B+ connected to the amp?
You'll have to be watching from the time remote is applied.
Do you get the same voltages with no B+ connected to the amp?
Pins 6 and 7 of LM339 both go immediately to the final tension.
Without B+ connected, all values of all the pins of LM339 are 0
Without B+ connected, all values of all the pins of LM339 are 0
I have contacted Rockford and this is your answer:
"Response Via Email(Forrest) - 05/01/2018 08:32 AM
thats a current SKU, schematics are not available".
To this day, Rockford continues not to provide its schemes to customers.
"Response Via Email(Forrest) - 05/01/2018 08:32 AM
thats a current SKU, schematics are not available".
To this day, Rockford continues not to provide its schemes to customers.
They will (or have, policy may have changed) provide diagrams for amps that have circuits that are no longer current.
I have asked again, explaining what you suggested to me in your last #post, but there has been no luck ..
Your answer has been this:
"Response Via Email(Forrest) - 05/01/2018 11:55 AM
we dont have that schematic available, its still current" .
Your answer has been this:
"Response Via Email(Forrest) - 05/01/2018 11:55 AM
we dont have that schematic available, its still current" .
I think I will do the following:
Today is already late for me, tomorrow I will replace LM339, (I think I have some of these IC'S in my closet) and I will connect the amplifier to see what happens.
If the amplifier continues in the same state, I will order a TL494 IC
Today is already late for me, tomorrow I will replace LM339, (I think I have some of these IC'S in my closet) and I will connect the amplifier to see what happens.
If the amplifier continues in the same state, I will order a TL494 IC
I think pin 3 should be near 12v (fed from the remote input). They may have changed the circuit but I don't think the IC can operate from 5v when some of the inputs are the same as the supply input.
Yes, I also thought something like that, Perry.
I followed the trail of the parts that are next to this pin, (resistors, drivers and diodes) but I have not found anything strange.
Tomorrow I will inspect again, before replacing this IC.
I followed the trail of the parts that are next to this pin, (resistors, drivers and diodes) but I have not found anything strange.
Tomorrow I will inspect again, before replacing this IC.
Today, Rockford almost does not manufacture car amplifiers.
Everything went to China, and the PRIME series is made by an X manufacturer that makes the same product for several companies.
Schemes? They have, but their policy has always been to provide only their representatives in the world technical material.
I believe Perry will help you as much as he can. He has tremendous knowledge
Everything went to China, and the PRIME series is made by an X manufacturer that makes the same product for several companies.
Schemes? They have, but their policy has always been to provide only their representatives in the world technical material.
I believe Perry will help you as much as he can. He has tremendous knowledge
Yes, it's true, motronix, in recent years almost everything is made in China ...
I always trust Perry, he's a monster in these matters.
I always trust Perry, he's a monster in these matters.