HIP4080 amp - EVO 2200.1

[Perry Babin]

There is a conflict with pins 5, 6 and 7. With pin 6 being higher than pin 5, pin 7 should be very near 0v.

Are all of the original parts in place and all added parts (100k resistor) removed?

 

[chrisg4]

Yes, all originals. 100k removed

only have the 4080 bridged at pin3&4

 

[Perry Babin]

OK but there is still a conflict with 5, 6 and 7. Is pin 7 possibly shorted to pin 8?

 

[chrisg4]

Pin7 & Pin8 are not shorted.

The voltage is originating on Pin 4 of the 4013 which connects to 12v through a 2.2k (RS7) resistor as per the diagram

 

[Perry Babin]

The 17358 would be capable of pulling that 2.2k to ground.

Did these 17358s come from a reputable distributor?

 

[chrisg4]

yes, reputable distributor

swapped out the 17358 with a 4558, result is the same...

 

[Perry Babin]

The 17358 is capable of taking input at the voltage of the negative rail without error. The 4558 probably isn't.

Do you have an LM293/393?

 

[chrisg4]

ok, i think have but not in DIP package...

will have to order some 17358s

 

[Perry Babin]

Wasn't one of the original 17358s OK?

 

[chrisg4]

yes, there are 2 more 17358s

swapping a known working one, resolved the over current issue

 

[chrisg4]

Fitted old outputs

get below on the 4 banks

amp does not produce audio

 

[Perry Babin]

With a multimeter, using the primary ground as the reference, what's the DC voltage on each speaker terminal?

Are there any solder bridges (intentionally made) on any of the audio op-amps?

 

[chrisg4]

The relay is not engaging, the 17358 i removed was from the protection circuit, installed the 4558 in place...
as per the diagram, there should be an LM2904 there. I have a 2903 on hand, would i be able to use that?

 

[Perry Babin]

Do you have audio on the two output filter inductors?

Post the DC voltage on the 4558.

 

[chrisg4]

pin1 : 1.3v
pin2 : 4.5v
pin3 : 2.5v
pin4 : 0.00v
pin5 : 1.3v
pin6 : 4.8v
pin7 : 1.4v
pin8 : 12.5v

reply to #92
neg terminal: 32.6v
pos terminal: 32.3v

 

[Perry Babin]

Do you have audio on the two output filter inductors?

 

[chrisg4]

Hi Perry,

I have replaced the 4558 with an LM358

Im getting 18.5v on the speaker terminals, tried to adjust the 500k pot but it doesn't change the voltage

when i connect a speaker, there are pulses coming through.

 

[chrisg4]

dont appear to have audio on the 2 output inductors

 

[Perry Babin]

What's the voltage, now, on the 358?

 

[chrisg4]

Pin1: 0v
pin2: 4.5v
pin3: 2.5v
pin4: 0v
pin5; 0v
pin6: 4.8v
pin7: 0v
pin8: 12.5v