Alpine PDX1.1000 powers on, no audio (IR2010s HELP)

[Perry Babin]

I don't think that's pin 1.

Are you using a switchable probe set to 1x.

Remember, 3-4 cycles, not 50-100 cycles as you have.

 

[mild2wild]

Yes, switchable probe was set to 1x

Will do 3-4 cycles per screenshot

Downloaded 10 minutes of 100hz and 50hz test tones

What to check now?

 

[mild2wild]

Settings
100hz on top of E301
50hz on top of E301
100hz on top of E301 probe set to 10x
50hz on top of E301 probe set to 10x

 

[mild2wild]

E301: probe set to 1x ground clip on ground terminal
Settings
100hz
50hz

 

[mild2wild]

Settings
Outside leg of positive rectifier

 

[Perry Babin]

With audio driven into the amp, do you have any signal on the inputs of the two 2010s?

Is it audio frequency (50-100Hz) or high frequency (~80kHz)?

 

[mild2wild]

It is audio. 50hz and 100hz test tone tracks.

Input is pins 12 and 14 of the IR2010s?

 

[Perry Babin]

Yes.

 

[mild2wild]

No waveforms on pins 12 and 14. Just a straight line of DC voltage.

 

[Perry Babin]

What signal do you see on pin 6 of IC301/302?

On Q303/304 collector?

 

[mild2wild]

Settings
Pin6 of IC301 and IC302
Collector of Q303 and Q304 (-46v)

 

[mild2wild]

Not sure if it is related, or relevant, but remember we have Pin13 of both IR2010s lifted and jumped to Pin3 in order for the amp to turn on.

 

[Perry Babin]

If you lift/remove D307/308, do you get signal on the collectors of Q303/304?

 

[mild2wild]

With D307/308 lifted, I still get a straight line of - DC voltage on the collectors of Q303/304

Should I reconnect it, or leave it lifted for further testing?

 

[Perry Babin]

You can leave them disconnected. Do you see any signal on the base of the two transistors?

If the output of the IC has signal and that signal drives the two transistors, they should have signal on their collectors.

If the emitter of the transistors is at -5v, connect a wire jumper between the collector and emitter of Q310.

 

[mild2wild]

Emitter of Q303/304
Base of Q303/304

Reading 0.53v on the emitter of Q303/304

 

[Perry Babin]

Still nothing on the collectors?

 

[mild2wild]

Am I supposed to have that square wave on the emitter and base?

Do I still connect emitter to collector of Q310 even though I don't have -5v at Q303/304?

 

[mild2wild]

Q310
Settings
Base
Emitter
Collector
Pic of Q310? The number is partially obscured so I am just making sure.

 

[Perry Babin]

I wanted to know if you still had nothing but DC on the collectors of Q303/304?