can somebody tell me why my crown xls602 take about 5 minutes for the output relay to latch?,,, I have to wait about 5 minutes after the power is press.... the circuit have voltage,, the signal lights will blink to show that it have audio in the circuit,, is just I have to wait for the relays to latch so that mt sub wil start play,,, why why why ???
something in the power supply or Vas stage is not happy and the resulting condition is keeping it from enabling the output.
as this is the amp your using to drive subs i would also ensure that all fans are operating and are free of build up and check that all filters are clean, heat build up kills high duty cycle stuff like supply caps and over time can take it's toll on output devices.
as this is the amp your using to drive subs i would also ensure that all fans are operating and are free of build up and check that all filters are clean, heat build up kills high duty cycle stuff like supply caps and over time can take it's toll on output devices.
please check inrush circuit which reduces input current, if this circuit after few seconds isn't bypassed, maybe there are problems with voltage on power rails of the amp.
I've attached the Inrush schematic. The location on the pcb is the red circle.
Be careful with the Mains voltage when working there.
Information at these pages may be helpful.
Crown XLS-202 Poweramp Repair – AmpsLab
Crown XLS-402 Power Amplifier Repair – AmpsLab
Regards
Mike
Be careful with the Mains voltage when working there.
Information at these pages may be helpful.
Crown XLS-202 Poweramp Repair – AmpsLab
Crown XLS-402 Power Amplifier Repair – AmpsLab
Regards
Mike
Attachments
Is your XLS 602 3U height with a single fan?
I suggest you check the amp's output first to see whether there's any DC.
If the amp is working fine, then it's the relay control circuit.
Before you proceed any further, make sure you don't touch the heatsinks. They are at about + - 95Vdc.
I suggest you check the amp's output first to see whether there's any DC.
If the amp is working fine, then it's the relay control circuit.
Before you proceed any further, make sure you don't touch the heatsinks. They are at about + - 95Vdc.
... I'm sure the output is working good good because if I bypass any of the relay I will get good audio
That's good.
I've attached the relay circuit as well as the full schematic.
Q3 is the transistor that switches on all the relays.
One or more E-caps preceding this transistor is probably the culprit.
Check C16 (4u7/16V) first. This is the timing capacitor. If it's bad, it'll take a long time for Q3 to switch on.
IC1A (TL074) and the diodes before it are for sensing DC on the amp output. I doubt that's where the problem lies. But since you're at it, you might as well change E-caps C9 and C10.
Lastly, check the power supply E-caps C17 and C18.
I've attached the relay circuit as well as the full schematic.
Q3 is the transistor that switches on all the relays.
One or more E-caps preceding this transistor is probably the culprit.
Check C16 (4u7/16V) first. This is the timing capacitor. If it's bad, it'll take a long time for Q3 to switch on.
IC1A (TL074) and the diodes before it are for sensing DC on the amp output. I doubt that's where the problem lies. But since you're at it, you might as well change E-caps C9 and C10.
Lastly, check the power supply E-caps C17 and C18.
Attachments
It could still have some dc on it though which would upset protect.
It should be less than 500mV DC on output.
ok will do.. could you tell me now what will cause a delay with ch 2 on my 3600 crown... ch 2 will come on about 2 seconds after ch 1
Crown Macrotech 3600?
If it is, then you shoud check voltage symetry on it, sometimes voltage dividers which are placed in compact resistor group fail and middle point is not correct.
If it is Macrotech 3600VZ then it has more complex power supply wich will double voltage when needed, but also you should check voltage symetry. Check service manual and schematics, power supply is single voltage, but has to be symetrical to the chassis ground or lets say input ground.
If it is, then you shoud check voltage symetry on it, sometimes voltage dividers which are placed in compact resistor group fail and middle point is not correct.
If it is Macrotech 3600VZ then it has more complex power supply wich will double voltage when needed, but also you should check voltage symetry. Check service manual and schematics, power supply is single voltage, but has to be symetrical to the chassis ground or lets say input ground.
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