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Kicker ZX1500.1 protects when driven hard
Kicker ZX1500.1 protects when driven hard
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Old 15th January 2021, 06:52 PM   #21
peeby is offline peeby
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No, using the secondary ground.

Using the scope, the rail seems to "Freak out" right at the point of amp shutdown, hard to tell if it is prior or post to shut down.
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Old 15th January 2021, 07:28 PM   #22
PapaZBill is offline PapaZBill  United States
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Have you tried to vary voltage w/o signal as Russell suggested in post #15?

I believe I have seen an issue with the UVP back in the day. Take voltage measurements around U2-TL494. Use power ground for black probe. Also check around Q28-KTC4401 and D30-1N5237B-8.2v zener diode.

The noise may be the cause of a burnt ground trace and be be why the amp is shutting down. You will have to examine the bottom side of PCB to determine. This was not an uncommon problem and is easily fixed.
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Old 15th January 2021, 09:58 PM   #23
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Varying voltage the amp shuts off when decreasing supply voltage at 9.5 volts.

Cant find any burned traces.

Voltage across zener D30 is 8.1V. Q28 checks ok in circuit.
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Old 15th January 2021, 11:15 PM   #24
PapaZBill is offline PapaZBill  United States
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Post the DC volts around U2

Did you examine the bottom side of PCB?
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Old 15th January 2021, 11:40 PM   #25
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The voltage around U2 are normal. Pin 3 is staying at 0v and the chip is producing PWM on 9 and 10.

So I just figured out even with no load on the speaker outputs the amp will while increasing sine wave input, start to draw excessive current and shut down at the same point everytime. Pin 3 on U2 stays at 0V, then there is a transient spike on Pin 3 and it shuts down.
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Old 18th January 2021, 06:48 PM   #26
PapaZBill is offline PapaZBill  United States
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Inspect both L100 and L101 for delamination's, hotspots or cracked cores. If possible measure the inductances of each, out of circuit. Check pre and post filter caps and resistors.

Be sure there is continuity between the inductors and the TP labeled SFB on Class D card.
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Old 19th January 2021, 11:45 PM   #27
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L101 14 ohms .01 mH
L100 .1 ohm .16mH

The cap in the attached pic. What should it be? Reading 677pF out of circuit.

Also I've lost low voltage (+/- 12 and 5v.) Rail still there.

Assuming TIP 41 and 42 are low voltage regs?
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Old 20th January 2021, 12:45 AM   #28
PapaZBill is offline PapaZBill  United States
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Q21 and Q23-TIP41 are regulators for the +12v and +5v respectively and Q22-TIP42 is the -12v regulator.

L101 should be 80uH L100 should be 16uH. I would recheck both.

Is the cap C60? It should be 1.8uF/400v
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Old 20th January 2021, 05:42 PM   #29
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Cannot get the low voltage up and running. It appears the regulators originate via aux tap on the main transformer thru D13 and D14. Have a "square wave" on trans side of diode and no voltage on the regulator side. Not sure if transformer is being driven hard enough but the main rails are ok.
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Old 20th January 2021, 06:20 PM   #30
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D13 & D16-1N4934 are the negative full bridge rectifier and D14 & D15-1N4934 are the positive side. If you are missing D15 & D16 the rectifiers on both sides will be disabled.

When did you lose the +/- 12v and +5v supply?

Do you have any voltage at the TP's on preamp or Class D card?

If you remove the preamp board or the Class D card, is there a change?
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