I don't have photos but it appears that that's what it is. This is the part number:
02DZ16F-Y
but it will probably be easier to buy a generic replacement. For testing, you can use a through-hole zener.
02DZ16F-Y
but it will probably be easier to buy a generic replacement. For testing, you can use a through-hole zener.
The diode is defective ..
I was looking at a differnt diode so didnt think it was bad..
The Diode D3 is defective wondering what way it faces since the diode on the board now is burnt..
I was looking at a differnt diode so didnt think it was bad..
The Diode D3 is defective wondering what way it faces since the diode on the board now is burnt..
Ok now i get the Positive 15 volts..
But now i get 40 volts on all 3 legs of the transistor that controls the - 15 volts..
Any ideas what would cause this?
But now i get 40 volts on all 3 legs of the transistor that controls the - 15 volts..
Any ideas what would cause this?
Do you mean negative 40v?
The zener either has a bad connection to the pads or is open. This may have caused damage to some of the op-amps. Most op-amps can't withstand more than a bout 32v total across their power supply terminals. This would have applied 55v across them.
The zener either has a bad connection to the pads or is open. This may have caused damage to some of the op-amps. Most op-amps can't withstand more than a bout 32v total across their power supply terminals. This would have applied 55v across them.
No. It's reversed for the negative regulator. If it was installed reversed, the voltage should have been limited to less than 1v out from the regulator.
Ok i have both + - regulated voltages now..
How do i check to see if the op-amps are defective ?
Amp powers up but has no output
How do i check to see if the op-amps are defective ?
Amp powers up but has no output
Ok with all parts put back in the amp when i try to power it up the red light will come on for 2 secs then shut off..
Heres what i get on the 494
Pin 1:2.54
Pin 2:0.56
Pin 3:4.73
Pin 4:0.61
Pin 5:1.45
Pin 6:3.58
Pin 7:0.00
Pin 8:13.89
Pin 9:0.02
Pin 10:0.03
Pin 11:13.79
Pin 12:13.79
Pin 13:4.94
Pin 14:4.94
Pin 15:4.94
Pin 16:0.00
Any ideas??
Heres what i get on the 494
Pin 1:2.54
Pin 2:0.56
Pin 3:4.73
Pin 4:0.61
Pin 5:1.45
Pin 6:3.58
Pin 7:0.00
Pin 8:13.89
Pin 9:0.02
Pin 10:0.03
Pin 11:13.79
Pin 12:13.79
Pin 13:4.94
Pin 14:4.94
Pin 15:4.94
Pin 16:0.00
Any ideas??
The amp is in protect. I'd suspect that it's DC offset protection. Do you see excessive DC on either of the bridging speaker terminals?
No both measure 0.02
When i first power up the amp i get a pulse of DC voltage about 5 volts from the left channel..
When the amp protects the voltage is at 0
I replaced the C4467's in th left channel 1 was defective..
When i first power up the amp i get a pulse of DC voltage about 5 volts from the left channel..
When the amp protects the voltage is at 0
I replaced the C4467's in th left channel 1 was defective..
The DC goes away because the amp goes into protection.
Before the regulator problems, was the amp going into protect mode?
Before the regulator problems, was the amp going into protect mode?
There are probably a lot of transistors that will work. If you can't find the original, I'd try a KSA1220A.
I dont get this amp..
Replaced the A965 with the orginal..
Amp goes straight to prtection..
I pulled all outputs and drivers from the left channel amp still is stuck in protection..
Im going to pull the outputs from the right channel to see if the amp will power up
Replaced the A965 with the orginal..
Amp goes straight to prtection..
I pulled all outputs and drivers from the left channel amp still is stuck in protection..
Im going to pull the outputs from the right channel to see if the amp will power up
All of the outputs are removed from the amp..
amp is cycling back and fourth betwwen powering up and protection mode..
Any ideas on where to go next?
amp is cycling back and fourth betwwen powering up and protection mode..
Any ideas on where to go next?
If you remove W308 near the 494, does that allow the amp to remain on?
Be careful, this will disable the protection circuit.
Be careful, this will disable the protection circuit.
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