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Old 2nd September 2019, 10:14 PM   #11
rhempz01 is online now rhempz01  United States
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i beleive that d19 is not good. I changed it made no difference.

Last edited by rhempz01; 2nd September 2019 at 10:32 PM.
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Old 3rd September 2019, 05:45 PM   #12
PapaZBill is offline PapaZBill  United States
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Check U3-74HC74 Pins 4 & 6 for 5Vdc from neg speaker terminal. If no 5Vdc on Pin 6 Look at Q9,18,19,20-KTC4401 for shorted devices. Also, check Q101-MPSA92 and Q111-MPSA42. Q101 and Q111 are the OCP sensors and tie back the U3 through the KTC4401 transistors. If any short whichs has been known to happen they will send a false and cause amp to go into protection mode.
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Old 3rd September 2019, 08:40 PM   #13
rhempz01 is online now rhempz01  United States
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neither pin has 5v on it, replaced every part on the list still same effect. the relay will click 3-4x fast on and off off then wait like its going to come on but just click again.
pin 4) 2.894vdc
pin 6) .336vdc
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Old 4th September 2019, 01:23 PM   #14
PapaZBill is offline PapaZBill  United States
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Remove the Class D control board and check to see if U3 Pin 4 has 5vdc. You may have to remove D7.

Have you tried the other Class D board?
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Old 4th September 2019, 02:24 PM   #15
rhempz01 is online now rhempz01  United States
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no its at 3.85 then drops down to the 2.89
D7 is removed.
I have tried both driver cards same result.
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Old 9th September 2019, 12:55 AM   #16
PapaZBill is offline PapaZBill  United States
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Okay, Look at the DC voltage across C11 and C12. You should have about 18 volts.

This is the isolated supply for the Class D drivers Q102 associated with C12 and Q100 associated with C11.

Check the Voltages at all three legs of Q102 and Q100 using the negative side of their associated capacitors.

Recheck the following. I'm not clear if you replaced the devices. There should be 5 volts on U3-Pins 4 & 6. You may need to replace the 74HC74 or the OPT1-PC817- You should be using the negative speaker terminal as a reference or the power transformer secondary.

Q9,18,19,20-KTC4401 and Q101-MPSA92 and Q111-MPSA42
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Old 9th September 2019, 01:42 PM   #17
rhempz01 is online now rhempz01  United States
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ok so across the capacitors 15.69vdc
i changed the 74hc74d and now have
pin 4) 4.979v
pin 6) 4.726v
the protection stopped somehow? Not right away after changing the 74hc74d but a few power up after.
the three legs from the green caps in front of them leg 1 (left)
q111
1) 0.00
2) 0.00
3) 128.6
q101
1) 0.00
2) 0.00
3) -130.6

Last edited by rhempz01; 9th September 2019 at 01:49 PM.
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Old 9th September 2019, 02:03 PM   #18
PapaZBill is offline PapaZBill  United States
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So the 74HC74 was bad and replacing it restored the protection circuit. Pin 6 of U3 is the Not Q output of the flip flop and when low will cause Pin 16 of U2-TL594 to go high and causing a Protection condition.

Now that the amp is out of protection what is the status of output, drive etc..
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Last edited by PapaZBill; 9th September 2019 at 02:07 PM.
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Old 9th September 2019, 06:51 PM   #19
rhempz01 is online now rhempz01  United States
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so once i installed the class d card back into protection. and something is pulling down the voltage to about 10.2vdc after the relay engadges, without the class d card the result is the same now.
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Old 12th September 2019, 03:00 PM   #20
PapaZBill is offline PapaZBill  United States
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When you say something is pulling down the voltage to 10.2 vdc,which voltage are you referring to?

And without the class D board the amp Powers up and all voltages appear to be nominal?

Please give as much detail as possible. This amp is tricky, with isolated supply's and the class D board complicates troubleshooting.
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