Hifonics zeus gen x

[mike49504]

Amp wont power on at all wondering what to check next

 

[Perry Babin]

Post the voltage on all 16 pins of the 494.

IC#
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:

 

[mike49504]

pin1=11.07
pin2=12.23
pin3=11.48
pin4=11.49
pin5=11.51
pin6=11.56
pin7=11.48
pin8=13.61
pin9=11.72
pin10=12.24
pin11=13.60
pin12=13.60
pin13=12.78
pin14=12.78
pin15=12.68
pib16=11.42

 

[Perry Babin]

You've lost your ground.

 

[mike49504]

ok so what do i check for to see if i can fix the ground issue

 

[Perry Babin]

With the black probe on the ground terminal of the amp (inside the amp), what's the DC voltage on pin 7 of the 494?

 

[mike49504]

ok i figured out why i wasent getting ground but now when u hook power and ground to the amp no remote the amp draws 60+ amp

 

[Perry Babin]

What was causing the loss of ground?

 

[mike49504]

you have to hook 3 power wires and 3 ground wires to this amp in order to turn it on not just one

 

[Perry Babin]

Did an FET become shorted?

Are you sure you don't have B+ and ground reversed?

 

[mike49504]

im 100% sure i didbnt have the pos and neg reversed all fets test good

wondering what will disable the output side to i can see if the amp will power up

 

[Perry Babin]

Pulling the rectifiers will isolate the audio section but that's not likely going to accomplish anything because it's doing it with no remote voltage applied.

What's the DC resistance across the B+ and ground terminals (disconnect the 12v power supply from the amp before measuring the resistance)?

 

[mike49504]

how do i measure that red probe on power black on ground meter set to?

 

[Perry Babin]

Yes. Meter set to ohms.

 

[mike49504]

Ok Perry i found the problem there was a solder bridge from the pos to ground ill check the voltages on the 494 and post again in 2 mins

 

[mike49504]

tl494
pin1=0
pin2=4.15
pin3=4.73
pin4=0.22
pin5=1.40
pin6=3.37
pin7=0
pin8=13.91
pin9=0
pin10=0
pin11=13.90
pin12=13.91
pin13=4.90
pin14=4.90
pin15=4.90
pin16=12.89

 

[Perry Babin]

Pin 16 is causing pin 3 to go high which is shutting down the supply. Is there an op-amp near the 494?

 

[mike49504]

all i see is a lm324n next to the tl494

 

[Perry Babin]

Post the voltages on that IC.

LM324
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:

 

[mike49504]

lm324n
pin1=0.67
pin2=0.67
pin3=0.67
pin4=0.70
pin5=.04
pin6=2.54
pin7=.06
pin8=0
pin9=0.64
pin10=1.93
pin11=0
pin12=0.64
pin13=2.54
pin14=1.89

if this thing is bad can i sub something else for it or do i need the the orginal