Parasound 2125 2 channel power amp problem

[crippledchicken]

There is no difference if K501 coil is 24V (Q216 collector voltage) or 0V (Q216 pulled out). So, can you pull out relay and check it?

I never checked if amp still came on when I pulled Q216 just checked the transistor and I thought it checked good? There is a trace going from the base of Q216 which I could cut and repair easily could I try that first? Or would that be of no help? Thanks 🙂

 

[overall feedback]

I never checked if amp still came on when I pulled Q216 just checked the transistor and I thought it checked good? There is a trace going from the base of Q216 which I could cut and repair easily could I try that first? Or would that be of no help? Thanks 🙂

You can try this or remove one pin R230 to save your tracks 🙂, or simply remove Q216 collector pin.

 

[tauro0221]

Hi,
If pin 1 of CD4013B it is high that will enable the relay. Ground pin 1 of the CD4013B to see if it disable the relay. If pin 1 it is high it will enable Q217. We need a zero at the base of Q217.

 

[crippledchicken]

I lifted leg of r230 and now, the amp does not come on when plugged in and I checked pin 1 a while ago and it had 0volts. Is this an idicator that Q216 is bad? the voltage is the same on the collector and base?

 

[crippledchicken]

I'm getting confused, pin 1 voltage was 12v while ago pushing button or not

 

[crippledchicken]

When I plug amp in, I have zero volts at pin 1 but, once I push the power button I then have 12v at pin 1 but pushing it again does not change it back to zero I have to unplug to get zero agan

 

[tauro0221]

Now I am lost. Solder back the resistor and with power amplifier ON ground the point between the resistor R247 and R255. That will tell you if Q217 & Q216 and Q214 are working OKAY. It will enable and disable the relay when you ground the connection between the two resistors.

 

[crippledchicken]

If it won't hurt anything I will ground pin 1 to see if amp turns off?

 

[crippledchicken]

Now I am lost. Solder back the resistor and with power amplifier ON ground the point between the resistor R247 and R255. That will tell you if Q217 & Q216 and Q214 are working OKAY. It will enable and disable the relay when you ground the connection between the two resistors.

I soldered it back I will now try what you said

 

[overall feedback]

I soldered it back I will now try what you said

Please check D224 diode

 

[crippledchicken]

Please check D224 diode

I'm slow at this I did what he said but did not turn off amp?

 

[crippledchicken]

I'm slow at this I did what he said but did not turn off amp?

diode checks normal in board

 

[tauro0221]

I do not think it will hurt anything since the output from the CD4013B it is zero and 15 volts.

 

[crippledchicken]

When i plug amp in no volts on pin 1 till i push power button but, pushing it again will not remove 12 v from pin 1 I plug it in it plays fine without even pushing power button?

 

[crippledchicken]

I do not think it will hurt anything since the output from the CD4013B it is zero and 15 volts.

no turn off grounding pin 1?

 

[tauro0221]

Hi,
What it is the voltage at the base of Q217?

 

[crippledchicken]

Hi,
What it is the voltage at the base of Q217?

i will check it

 

[crippledchicken]

its .727vdc

 

[crippledchicken]

should base and collector of Q216 have 24vdc?

 

[tauro0221]

Hi,
What it is the voltage at the base of Q214? It should be positive 24 volts.