HIP4080 amp - EVO 2200.1

[chrisg4]

Yes, i used that same part. my multimeter for some reason indicated a shorted but with another meter there was no short, there's a resistance of 120ohms between pin4 and pin6.

 

[Perry Babin]

Is that out of the circuit?

 

[chrisg4]

Yes, out of circuit on board there is 120ohm present between pin4 and pin6. the IC out of circuit, there was no short.

 

[Perry Babin]

I've never had to measure that but that seems bad. Does the resistance change significantly with the leads reversed?

What do you read from 4 to 2?

 

[chrisg4]

remains the same with the leads reversed.

4 to 2 is 3k

 

[Perry Babin]

I think it's defective. The 358 can take inputs very near ground. Do you have another op-amp that can do that? Any rail-rail op-amps?

 

[chrisg4]

I have a 4558 only, the parts I ordered will arrive next week.

I think I'm reading the circuit incorrectly.

the 17358(A in attached pic) in question is CA3290 connected to the CD4013 on the diagram FP900. B is the only other 17358

my amp has 2x TL084cn as per below

audio is present on below yellow dots marked on the TL084s

the yellow arrow is where the trace connects into the circuit

 

[chrisg4]

Update:

I have managed to get output on pin7 (squarewave) of the hip4080, I lifted pin3 (hip4080) which was high. the JFET gate is high as well, should it be low?

no outputs in circuit.

 

[Perry Babin]

Connect the lifted pin 3 to pin 4 to ensure that it's not floating.

I don't know about the jfet.

Pin 7 is a 'square' wave? What if you reduce the input signal level?

 

[chrisg4]

Update:
replaced CD4013 & HA17358 - but it still shuts the 4080 off (how do i check the what is causing the 4013 to turn off the 4080?)

Pin3 lifted and connected pin4 of the 4080

Drive signals

probe on 10x

 

[Perry Babin]

Where are these taken from?

Is the amp shutting down without the output FETs in the circuit?

 

[chrisg4]

these were taken on the gate pads

output fets are not in circuit, over current protect is on as well. (was not able to source irf3710z)

yes, amp is shutting down

 

[Perry Babin]

What pin of what IC is driving the clock terminal of the 4013?

Load the FET locations (gate to source) where you're measuring the signal with a 0.01uF film capacitor and post the gate signals. You may have to install a jumper from the drain to source of the low-side FET to get an accurate waveform.

You only posted for 2 banks. Post the signals for all 4 banks.

 

[chrisg4]

Pin1 of 17358 drives pin3 of the 4013

 

[Perry Babin]

Is either of those ICs in a socket?

 

[chrisg4]

No they are soldered directly to the board...

below is the drive of the high side when loaded with the 0.01uf cap (the gate resistor seems to have gone open here while loaded)
low side remains same with the source and drain bridged

 

[Perry Babin]

If you bridge pins 1 and 2 of the 5470 (on the diagram), you'll get a better drive waveform.

If you lift/remove RS19, does the amp go into protect?

 

[chrisg4]

having trouble locating the equivalent RS19 on my amp

 

[Perry Babin]

On the 17358, when applying remote, does pin 2 instantly go to 6v while pin 3 starts at ground and charges towards 12v over a few seconds?

Does pin 1 transition from 0v to near 12v a few seconds after the remote is applied?

 

[chrisg4]

Pin2 - charges 6v instantly
Pin3 - charges 10.6v almost instantly
Pin1 - charges to 11.3v