Is it correct to say that it only draws excessive current when a load is connected to the 400 series channel?
But no excessive draw with no load on that channel?
But no excessive draw with no load on that channel?
WITH NO LOAD, does the amp draw excessive current when you install the output FETs in the 400 series channel?
without load there was a voltage of 37 volts dc on q420 and Q423 but no excessive consumption 1A
since then I have not re-soldered a new mosfet!
since then I have not re-soldered a new mosfet!
Do you read infinite resistance between the gate and the other two terminals on each of the output FETs in that channel (out of the circuit)?
Q420: GS: 31 ohm ............GD:212 ohm
Q423 : ..GS : 31 ohms .........GD : 93 ohms
Q419: infinite resistance
Q422: infinite resistance
Q423 : ..GS : 31 ohms .........GD : 93 ohms
Q419: infinite resistance
Q422: infinite resistance
Do you have any replacement FETs?
Confirm that all 0.1 ohm source resistors in that circuit are within tolerance.
Also confirm that R492, 493, 495 and 496 are within tolerance.
Confirm that all 0.1 ohm source resistors in that circuit are within tolerance.
Also confirm that R492, 493, 495 and 496 are within tolerance.
No I'm waiting to know how many FET I need to change before ordering
I checked all the resistances, they are good at 0.1 ohm
I checked all the resistances, they are good at 0.1 ohm
Also confirm that R492, 493, 495 and 496 are within tolerance.
You need to replace all 4 outputs in this channel.
You need to replace all 4 outputs in this channel.
R492: 20 ohm
R493: 20 ohm
R495 :20 ohm
R496: 20ohm
--
R481: 10 ohm
l474: 10 ohm
R476: 5.8 ohm
R477 : 6.1 ohm
R483: 10 ohm
R487: 5.7 ohm
low electric voltage: -37.57 Vdc ...... +37.11 Vdc
R493: 20 ohm
R495 :20 ohm
R496: 20ohm
--
R481: 10 ohm
l474: 10 ohm
R476: 5.8 ohm
R477 : 6.1 ohm
R483: 10 ohm
R487: 5.7 ohm
low electric voltage: -37.57 Vdc ...... +37.11 Vdc
The last 6 are in parallel with other resistors, compare their readings to the corresponding resistors in the other channels?
I wouldn't be concerned about that right now. There is sufficient voltage because the other channels are working.
You could try adjusting the 12v supply voltage to see if it changes.
Did you compare the resistances for the small resistors, as suggested?
You could try adjusting the 12v supply voltage to see if it changes.
Did you compare the resistances for the small resistors, as suggested?