Rockford Fosgate 1501bd preview Repairing

Status
Not open for further replies.
Jump to Latest
#101
Well, I have new results

I connected the potentiometer U17 as indicated in Seankane thread, I have also removed R31 and R35

No MOSFET transistor output on the motherboard

When connecting, and testing, the pins on the motherboard of the first group of eight MOSFETs, -9.70v. and 9.68 v. respectively when turning the knob from right to left.
But, to do the same with the other group of eight MOSFETs, and turn the knob, -9.92 v only appear as shown in photo

Which makes me suspect that there is any fault in what belongs to that section, but where? Any hints?

I will order more parts ... (LM6171, HCPL2211, MIC4420, etc. ...)
 

Attachments

  • DSCN3123.JPG
    DSCN3123.JPG
    783.2 KB · Views: 167
#103
Well, I'm here again
I have checked, U5, U6, U7, U8, U9, U10 and U15,

Turning the potentiometer all well regulated, volts positive and negative volt, at its inputs and its outputs, except the output of U15 (pin 7) and the output of U6 (pin 5) to give - 9.70 v always

I'm surprised that the latter are wrong, I have changed recently, is it possible that you are wrong? IC should I check some more? (TL 074, LM6172IM, .....)
 
#105
Sorry that I didn't see #103 earlier.

Confirm that the voltage measured directly across pins 2 and 3 of U15 are switching from 1.1v to -0.6v when you go from one extreme to the other with the potentiometer.

If that's right and the output of the opto-coupler isn't swinging to plus and minus 9v, the opto-coupler is defective. I'm assuming that the opto-coupler has approximately 18v across pins 5 and 8.

The scope with the sine wave locked on the display seems less likely to be defective. The one with only two straight traces could have several problems. Either one would should be good enough they are both in good working order.
 
#106
Perry quiet, do not feel, I know I'm patient and wait

I've done the checks that have told me and the voltage measured directly across pins 2 and 3 of the U15 is changing from 1.4V up to -0.68 V when going from one extreme to another with a potentiometer.
Between pins 5 and 8 is 19V
And on pin 7, there is always -9.70 V, while moving from one extreme to another with potentiometer
So I'll order a HCPL2211 (I heard that this IC, it is delicate to handle, is it true?)

Regarding the scope, most likely, I do, is to follow his wise advice, and try to stay with the Gould Ø300

Thanks again, Perry, and when you receive the parts, tell what happens.
 
#108
Well, I got the A2211 (U15)

And, check voltages, I noticed that when you turn the potentiometer back and forth in the output of this IC, I have, -9.70 v and 7.28v is this correct?
For a comparison with the other IC (U9) I have, -9.90 v and 10.28v Do these tensions should be more similar (7.28 and 10.28)?

¿I can ride MEHSA strip with all the mosfet?
 
#110
U15 probe pin8 red and black probe on pin 5: 19.68 v

pin7 (black probe pin5): 0.2 v

DC pin7 right: 7.31 v
DC pin7 left: -9.69 V (with the black probe to negative)

I have also checked U9

DC pin7 right: -10.89 v and swinging ..
DC pin7 left: 7.01 v and down ...
 
#114
Well, I'm back in the measurements,

In the first eight MOSFET (Q102, 103, 12, etc) 9.75 V and -9.81 V

In the following eight (Q104, 105,106, 8, etc) -9.92 V and 9.76 V

Perry, do you think the amplifier is ready for you solder the mosfet sixteen?
 
#118
Well, Perry, this afternoon I will pick up the oscilloscope, which has already arrived.

All that tells me to do, to publish the wave,,,,,
Already I can remove the pot, and re-solder the resistors?
and you then do what you say and publish the waveform, right?
 
Status
Not open for further replies.
Top Bottom