Hifonics BXI-6000D

[Perry Babin]

Are you referring to the drive into pin 1 or to the outputs?

Do you still have 73v DC?

 

[Achim1409]

I tested directly on the fets. Now i tested again on pin 1. One side i have a signal on pin 1, other side nothing. Without solder bridge i have 150V DC on the conductors.

 

[Perry Babin]

Check Q2 and Q7.

 

[Achim1409]

Seems both to be ok. Diode test, 0,85 and 0,98. Both same values.

 

[Perry Babin]

Those drive pin 1. Do both have a drive signal on the collector?

 

[Achim1409]

Wich collector? Pin 1 on 21844s? On pin 1 i have a drive signal, but only on one of the 21844s.


Did you mean i should check Q2 and Q7 Collector for drive signal?

 

[Perry Babin]

The collectors on the transistors that you just checked.

 

[Achim1409]

Yes i have Signal on both collectors.

 

[Perry Babin]

The signal passes through two 10k resistors to pin 1 of the driver ICs. Are the 10k resistors good?

Do you have good connections between all of those components?

Did you have signal on the dead pin 1 before replacing the IC?

 

[Achim1409]

I havent checked the signal without ic... Its very difficult to find the right resistors. If i measure from the collector to pin 1 i got on both parts the same value.

 

[Perry Babin]

Has the signal on pin 1 of the IC with no signal changed since you replaced the IC?

Is the DC voltage on pin 1 0v, referenced to the negative rail?

 

[Achim1409]

No, the signal has not changed. Iam not sure where to find the right place for my probe on negative, but if i connect one probe on pin 1 and the other on the rail bar i have 150v, on first pin of the fet 80V.

 

[Perry Babin]

With the new IC, if you short both ICs pin 2-3, do you still have DC on the output inductors?

Do you have a 10k through-hole type resistor?

 

[Achim1409]

if i short them, there is no more dc on the inductors. Yes i have a 10k resistor.


Found the resistors. Pin 1 is going to a 10k, from there to a 3,4k and from this to q2 base.


If i measure directly from pin 1 to Q2 Base i got 10k. Other side the same.

 

[Perry Babin]

Leave the 2-3 bridges.

Solder the 10k resistor to the points indicated by the arrows below. One end to any green. The other end to any yellow.

Driving a signal into the amp, do you see the same drive frequency square wave at pin 1 of the two 21844s?

 

[Achim1409]

Yes, same signal on Pin1 of both 21844, but on the not working side the signal is much weaker.

 

[Achim1409]

Her some Pictures. 100Hz with cellphone. Ground i took from the ring mount on the Audio Input Board.

 

[Perry Babin]

Ground the scope to the wire-type shunt resistors used for current sensing. Set the scope to manual. 2ms//div and 5v/div. Set to DC coupling. Center the trace on the reference line.

 

[Achim1409]

This Resistor?

 

[Perry Babin]

See attached.