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Rockford Fosgate Punch 600a4
Rockford Fosgate Punch 600a4
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Old 4th December 2020, 02:22 PM   #1
objext is offline objext  United States
diyAudio Member
Join Date: Mar 2005
Location: CA
Default Rockford Fosgate Punch 600a4

I got another 600a4 that needs repair. It "powers on" but only to illuminate the LED - it only draws 0.05A (same as when only remote is given power) and doesn't fully power up. No shorted FETs and no visible damage.

TL494 reads...

Pin 1: 40.4mV
Pin 2: 4.55V
Pin 3: 58.9mV
Pin 4: 99.5mV
Pin 5: 1.487V
Pin 6: 3.367V
Pin 7: 0.9mV
Pin 8: 12.65V
Pin 9: 4.92V
Pin 10: 4.92V
Pin 11: 12.66V
Pin 12: 12.66V
Pin 13: 4.96V
Pin 14: 4.96V
Pin 15: 4.96V
Pin 16: 0.5mV

Any pointers on what to look at? Only getting millivolts at the power supply FET gate legs.
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Old 4th December 2020, 08:11 PM   #2
Perry Babin is offline Perry Babin  United States
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
It would appear that you have a blown driver section if the voltage from pins 9 and 10 of the 494 isn't reaching the gate resistors. I'm assuming that you checked the gate resistors.
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
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