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Old 23rd March 2018, 12:43 PM   #11
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Did the power supply IC produce output pulses?

Did the power supply IC have 12v on pin 12?
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Old 23rd March 2018, 01:30 PM   #12
Jason Smith 616 is offline Jason Smith 616  United States
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This is what i get on the 494

Pin 1:0.00
Pin 2:0.10
Pin 3:0.03
Pin 4:3.60
Pin 5:1.53
Pin 6:3.37
Pin 7:0.00
Pin 8:13.88
Pin 9:0.00
Pin 10:0.00
Pin 11:13.88
Pin 12 :13.88
Pin 13:4.98
Pin 14:4.98
Pin 15:4.98
Pin 16: 0.00

Here's what i get on the Power supply fets

Gate:0.00
Drain: 13.88
Source: 0.00

The IC isnt producing pulse's
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Old 23rd March 2018, 01:37 PM   #13
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Remove R9903 from the circuit.
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Old 23rd March 2018, 01:53 PM   #14
Jason Smith 616 is offline Jason Smith 616  United States
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After removing R9903 the IC produces pulses but amp is still in protection mode and doesn't produce rail or regulated voltages
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Old 23rd March 2018, 03:45 PM   #15
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Do you have drive pulses on the gate legs of the 3205s?

Do you have a signal that swings from ground to 25v on the drains?
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Old 26th March 2018, 11:25 AM   #16
Jason Smith 616 is offline Jason Smith 616  United States
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I get drive pulses on the 3205's

I also get signal that swings about 25 volts volts from ground on drains
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Old 26th March 2018, 02:24 PM   #17
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
How can it not have rail voltage if the transformer is being driven?

Are the rectifiers in the circuit?
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Old 28th March 2018, 03:51 PM   #18
Jason Smith 616 is offline Jason Smith 616  United States
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The rectifiers are in circuit.

The rail voltage in this amp right now is only positive 2 volts and negative 2 volts thats all i get

I just noticed R9903 is missing it sits by the 494 do you happen to know the value ?

Last edited by Jason Smith 616; 28th March 2018 at 03:55 PM.
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Old 28th March 2018, 04:02 PM   #19
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
What voltage do you read if you read between the center terminals of the rectifiers?

820 ohms
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Old 28th March 2018, 04:24 PM   #20
Jason Smith 616 is offline Jason Smith 616  United States
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0.28 volts
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