I got a free Rockford bd1000a1, not to be confused with a newer model. Board is labeled stardust, has old school heat sink and its a power series.
Amplifier powers on green(no protect mode), no sound. Not even a hint of a vibration. I have tried two sets of rca outputs from head unit, with two different cables. Checked rca connection, loose solder joint. Fixed solder joint, still nothing.
Tried using a headphone jack to rca cable from phone, still nothing. used headphone jack/wire stripped to bare wire at solder joint to bypass rca's, no luck.
Amplifier appears to have been worked on previously in the output section. output transistors are irf6215, irf3415. Can tell from sloppy solder job on mesha boards.
I'm assuming no voltage on output terminals as there is not a hint of anything from speaker. Also, have tried different speakers. Nothing,
All help is appreciated.
Amplifier powers on green(no protect mode), no sound. Not even a hint of a vibration. I have tried two sets of rca outputs from head unit, with two different cables. Checked rca connection, loose solder joint. Fixed solder joint, still nothing.
Tried using a headphone jack to rca cable from phone, still nothing. used headphone jack/wire stripped to bare wire at solder joint to bypass rca's, no luck.
Amplifier appears to have been worked on previously in the output section. output transistors are irf6215, irf3415. Can tell from sloppy solder job on mesha boards.
I'm assuming no voltage on output terminals as there is not a hint of anything from speaker. Also, have tried different speakers. Nothing,
All help is appreciated.
What is the DC voltage measured directly across the red and black HV wires?
It may be a pair of metal bars in your amp if you have a green power LED.
It may be a pair of metal bars in your amp if you have a green power LED.
Have you tried working all potentiometers and switches through their full range to see if audio ever played through?
If you drive a strong signal into the amp, can you see the AC voltage on pin 1 of U4 vary with the input level of the signal?
If you drive a strong signal into the amp, can you see the AC voltage on pin 1 of U4 vary with the input level of the signal?
after further inspection, the rcas are definitely
badly broken, and i mistakenly jumped my wires the wrong point on the board. Ill test further and let you know what happens.
badly broken, and i mistakenly jumped my wires the wrong point on the board. Ill test further and let you know what happens.
I soldered female rca jacks into the board, still no sound. No voltage at outputs, no varying voltage at u4 pin one to any pin on the chip. Not sure if broken rca jacks were a coincidence, but I feel confident rcas are fine now.
Have you tried working all potentiometers and switches through their full range to see if audio ever played through?
Follow the signal through the circuit. Start at the RCAs to confirm that your test method allows you to see the signal. All op-amps in the preamp section should have audio on pins 1 and 7.
Follow the signal through the circuit. Start at the RCAs to confirm that your test method allows you to see the signal. All op-amps in the preamp section should have audio on pins 1 and 7.
The only potentiometers / switches on the amp are the gain and frequency adjustments. Which I did work them while playing the signal. I will do furthering testing tomorrow.
Also, where should my leads be while testing the op amps? Obviously one on the pin of the chip, but the other?
I'm having a hard time picking up the audio with the dmm. Oddly if I'm in the continuity mode , i can actually hear the music through the speaker on the dmm on most pins on the op amps.
You stated use the probe on the negative terminal, and other on pin. Which would leave me to assume to measure on dc volts, but I am under the impression the audio signal will be coming into the rcas in ac voltage. Should i measure in as or dc?
You stated use the probe on the negative terminal, and other on pin. Which would leave me to assume to measure on dc volts, but I am under the impression the audio signal will be coming into the rcas in ac voltage. Should i measure in as or dc?
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