Without the AOT460's measure the DC voltages around IC4 and look at Pin 3 and Pin 13 with a scope and post.
Where you able to see the drive with a scope before the output shorted?
Where you able to see the drive with a scope before the output shorted?
ic4 with the aot460 in curcuit.
pin
1.) 9.65v
2.) 1.139
3.) .002
4.) 0.00
5.) .005
6.) -0.686
7.) -0.640
8.) -.527
9.) -.553
10) -.439
11) -.475
12) .018
13) .211
14) .211
15) 5.980
16) .211
pin
1.) 9.65v
2.) 1.139
3.) .002
4.) 0.00
5.) .005
6.) -0.686
7.) -0.640
8.) -.527
9.) -.553
10) -.439
11) -.475
12) .018
13) .211
14) .211
15) 5.980
16) .211
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one of the diodes was backwards d34. i hanged the orientation.
This amplifier still stays in protection, most of these models, even with the outputs removed, will come out of protection after a few seconds.
This amplifier still stays in protection, most of these models, even with the outputs removed, will come out of protection after a few seconds.
ic4
1.) 10.24
2.) .634
3.) 2.077
4.) .005
5.) .001
6.) -31.52
7.) -35.75
8.) -27.96
9.) -36.67
10.) -36.67
11.) -24.37
12.) -.002
13.) .652
14.) .653
15.) 15.01
16.) .648
with the power supply in curcuit. and the diode correct.
1.) 10.24
2.) .634
3.) 2.077
4.) .005
5.) .001
6.) -31.52
7.) -35.75
8.) -27.96
9.) -36.67
10.) -36.67
11.) -24.37
12.) -.002
13.) .652
14.) .653
15.) 15.01
16.) .648
with the power supply in curcuit. and the diode correct.
Pin 2 IC4 should be ~10.3Vdc. This is the CSD input. Check the DC voltage around IC5-LM393 and post.
ic5
1.) .344
2.) 4.722
3.) 1.262
4.) .001
5.) 2.9-4.3v fluctuating
6.) 4.738
7.) .016
8.) 15.28
12.33v across c13
1.) .344
2.) 4.722
3.) 1.262
4.) .001
5.) 2.9-4.3v fluctuating
6.) 4.738
7.) .016
8.) 15.28
12.33v across c13
Check C96-102 and Q11-7002 with an Ohmmeter.
Lift D36 then D37 also D26 then D27, 1N4148 to see if the CSD returns to 10.3Vdc.
Lift D36 then D37 also D26 then D27, 1N4148 to see if the CSD returns to 10.3Vdc.
with everything in place, including the outputs what are you seeing? What does the drive look like? Do You have 10.3Vdc at Pin 2(CSD) of the IRS20957? Does Q19 get hot?
Without the outputs the CSD will be wrong. I discovered this working on another CXA.
Without the outputs the CSD will be wrong. I discovered this working on another CXA.