Are any of the op-amps getting hot?
How are the 1302 transistors connected to the regulator circuit?
How are the 1302 transistors connected to the regulator circuit?
I guess i was wrong the first time i tracked the circuit back the 1302's dont tie into the regulators..
The strange thing about this amp is when the preamp board is plugged in and i power the amp up the blue led doesnt light up but the amp produces both + - rail voltages but no regulated voltages..
If i unplug the preamp board and try to power the amp back up the blue light will come on but the amp will draw 60 amps of current..
The strange thing about this amp is when the preamp board is plugged in and i power the amp up the blue led doesnt light up but the amp produces both + - rail voltages but no regulated voltages..
If i unplug the preamp board and try to power the amp back up the blue light will come on but the amp will draw 60 amps of current..
Ok Back to this amp..
If i remove the TIP41C and The TIP42C i get + - 15 volts on the diodes and on pad 3 for the regulators..
As soon as i put the TIP41C and 42C back in I only get 0.83 volts and -0.83 volts on all op-amps..
Without the Tip transistors installed I get -0.84 volts on pins1-7 of all op-amps And -1.21 volts on pin 8 of all op-amps..
Any ideas what i should check next?"?
This amp has me stummped right now
If i remove the TIP41C and The TIP42C i get + - 15 volts on the diodes and on pad 3 for the regulators..
As soon as i put the TIP41C and 42C back in I only get 0.83 volts and -0.83 volts on all op-amps..
Without the Tip transistors installed I get -0.84 volts on pins1-7 of all op-amps And -1.21 volts on pin 8 of all op-amps..
Any ideas what i should check next?"?
This amp has me stummped right now
Ok i got the Tip41c figured out now i have positive 15 volts on the op-amps..
As soon as i put the tip42C in the amp will wont power up and stay in protection..
So im not sure if the Tip42C is the fault or not..
Pin 16 of the 494 has 11.68 volts on it..
Pin 1 is at 3.57 volts not sure if that normal or not??
Does anyone know how to disable the protection in this amp so i can get it to power up and find the fault??
Heres what i get on the 494
Pin 1:3.46
Pin 2:4.96
Pin 3:4.72
Pin 4:0.18
Pin 5:1.49
Pin 6:3.40
Pin 7:0.00
Pin 8:13.90
Pin 9:0.00
Pin 10:0.00
Pin 11:13.90
Pin 12:13.12
Pin 13:4.90
Pin 14:4.71
Pin 15:4.95
Pi 16:11.68
As soon as i put the tip42C in the amp will wont power up and stay in protection..
So im not sure if the Tip42C is the fault or not..
Pin 16 of the 494 has 11.68 volts on it..
Pin 1 is at 3.57 volts not sure if that normal or not??
Does anyone know how to disable the protection in this amp so i can get it to power up and find the fault??
Heres what i get on the 494
Pin 1:3.46
Pin 2:4.96
Pin 3:4.72
Pin 4:0.18
Pin 5:1.49
Pin 6:3.40
Pin 7:0.00
Pin 8:13.90
Pin 9:0.00
Pin 10:0.00
Pin 11:13.90
Pin 12:13.12
Pin 13:4.90
Pin 14:4.71
Pin 15:4.95
Pi 16:11.68
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Ok figured all that out now i get + - 15 volts on all op-amps..
Now i have a fault in the left channel..
Now i have a fault in the left channel..
Ok The orginal drivers for the outputs were A1011 and C2344
I replaced them with MJE15030 and MJE15031..
The amp dosent like theese drivers for some reason..
Is there any other good subs out there??
I replaced them with MJE15030 and MJE15031..
The amp dosent like theese drivers for some reason..
Is there any other good subs out there??
Are you sure that you're using the correct transistor as the sub (NPN/PNP)?
Have you tried the 15030/31 in a different channel to see if they work?
Have you tried the 15030/31 in a different channel to see if they work?
Ok the drivers werent the issue..
Ive replaced every transistor in that channel.. I checked ever resistor and diode in that channel..
Ive checked for solder bridges..
Any ideas what might cause the outputs to get red hot within 1 sec and amp draws 60 amps of current??
Ive replaced every transistor in that channel.. I checked ever resistor and diode in that channel..
Ive checked for solder bridges..
Any ideas what might cause the outputs to get red hot within 1 sec and amp draws 60 amps of current??
Did you get your camera charged?
If so, email me the best quality photos that you can of the defective channel. Take one photo, turn the board 90° and take another. Do this until you get photos from 4 angles. Email me the photos at the highest resolution.
If you only have your phone's camera, wait until you have something better. The phone images aren't sharp enough.
babin_perry@yahoo.com
If so, email me the best quality photos that you can of the defective channel. Take one photo, turn the board 90° and take another. Do this until you get photos from 4 angles. Email me the photos at the highest resolution.
If you only have your phone's camera, wait until you have something better. The phone images aren't sharp enough.
babin_perry@yahoo.com
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