Short Q11 C-E with a jumper and power up through a limiter. Does the amp produce audio at a normal level?
Yes amp came on with 1.7amps with limiting resistor and got 15v rms output signal on speaker terminals and it is 100hz signal it is clean.
One channel is pulling current mostly irf9640 0.1 ohm resistor is have 6.8 millions. On one resistor when I remove that mosfet other resistor now having 6.8 to 7 milliohms. I removed all 9640 except one and this mosfet resistor also having same value. Other side channel only has 0.2milliohm. Bias pot turned all to anti clock side.
What's the PC# for this amp?
PC-3083-C.
I removed all the mosfets on that channel now other side one mosfet is pulling 6millivolts across rresistor.So the amp is still pulling current.
See attached.
List which FETs are now out of the circuit and which FET has high current across it's 0.1 ohm resistor with the bias fully CCW.
Out of circuit fets
Q215 Q214 Q212 Q211
Q220 Q219 Q217 Q216
Current across 0.1 resistors
Q213. 5.7mV
Q218. 5.7mV
Q315. 1.2mV
Q314. 2.3mV
Q313. 1.0mg
Q312. 1.1mV
Q311. 1.2mV
Q320. 0.5mV
Q319. 4.1mV
Q318. 0.6mV
Q317. 0.8mV
Q316. 0.6mV
Q319 or it's gate or source resistors appear defective.
I removed the fet. But the amp still trying to pull current. Other channel still showing 6.4mV across Q213 and Q218 source resistors.
After removing that fet causing high current across resistor and few more gets. I am having balanced current draw on left and right side fets. But the amp still trying to pull current
I did not understand?How did the current change across the 300 series source resistors?
He is asking what the voltage is now across the source resistor for the fet you pulled out (Q319)
The 300 series parts are marked on the board for example R301,R355 ect if you look at the silk screen printing on the board 1 channel all the resistors diodes ect are marked 3xx and the other channel are marked 2xx
The 300 series parts are marked on the board for example R301,R355 ect if you look at the silk screen printing on the board 1 channel all the resistors diodes ect are marked 3xx and the other channel are marked 2xx
What is it that you don't understand?
I dont see any current across resistors who's fets are out of board.
Thank you for explaining. I was so dumb lolHe is asking what the voltage is now across the source resistor for the fet you pulled out (Q319)
The 300 series parts are marked on the board for example R301,R355 ect if you look at the silk screen printing on the board 1 channel all the resistors diodes ect are marked 3xx and the other channel are marked 2xx
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