Looking for some direction for resolving an issue of it displaying "OVERLOAD". I am aware of what the user manual says, but I have this amp on the bench with only the power supply connected.
What did you find in the Service Manual.
Because that's where you should be looking if there's an issue.
Because that's where you should be looking if there's an issue.
The service manual says;
Protection Circuitry
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The protection circuitry may have operated if either of the following conditions are noticed:
l No sound is heard when the power is turned on.
l Stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative
speaker connection wires are “shorted”, or if speaker systems with an impedance less than the
indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off
and then on again.
The user manual says:
Sound stops. “OVERLOAD”
appears on the display.
Switch off the unit, determine and correct the cause, then switch the unit on.
Causes include:
–Shorting (bare wires touching) of positive and negative speaker wires.
–Using speakers with an impedance lower than that rated for this unit.
–Straining of the speakers through excessive volume or power.
–Using the unit in a hot environment without proper ventilation.
Protection Circuitry
TOP PREVIOUS NEXT
The protection circuitry may have operated if either of the following conditions are noticed:
l No sound is heard when the power is turned on.
l Stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative
speaker connection wires are “shorted”, or if speaker systems with an impedance less than the
indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off
and then on again.
The user manual says:
Sound stops. “OVERLOAD”
appears on the display.
Switch off the unit, determine and correct the cause, then switch the unit on.
Causes include:
–Shorting (bare wires touching) of positive and negative speaker wires.
–Using speakers with an impedance lower than that rated for this unit.
–Straining of the speakers through excessive volume or power.
–Using the unit in a hot environment without proper ventilation.
No offence, but that Panasonic model was just ok - not in their Digital series...if you really want a fantastic sounding Panasonic, get the Equibit powered digital SA XR-25 or SA XR-55. These can be found for less than $50...I have six of them!
Overload can come on if input too strong. Reduce input.
Also:
Also:
- In the settings, there should be a digital attenuation....reduce
- Reset entire unit - should say in manual what the buttons to press
This seems to be where the problem is.
On IC601 Pin17(VDLIM) has -13.1vdc, Pin16(RLY) has 0vdc and Pin12(DISP) has 2.84vdc.
All of this seems to indicate that it is in protect mode.
IC601 Pin12(DISP) goes to IC901 Microprocessor Pin7(THERM/OVLD1) which is an input to the microprocessor.
IC601 Pin17(VDLIM) goes to IC901 Microprocessor Pin45(LIMITTER) which is an output from the microprocessor.
IC601 Pin16(RLY) goes to the relay control for the speaker outputs.
IC601 Pin10(OVERDET) is showing the correct voltage. It goes to the fan control circuit and the speaker outputs after the relays.
All other pins on IC601 have the correct voltages.
I lifted R629 connected to IC601 Pin12 but it stills displays "OVERLOAD".
On IC601 Pin17(VDLIM) has -13.1vdc, Pin16(RLY) has 0vdc and Pin12(DISP) has 2.84vdc.
All of this seems to indicate that it is in protect mode.
IC601 Pin12(DISP) goes to IC901 Microprocessor Pin7(THERM/OVLD1) which is an input to the microprocessor.
IC601 Pin17(VDLIM) goes to IC901 Microprocessor Pin45(LIMITTER) which is an output from the microprocessor.
IC601 Pin16(RLY) goes to the relay control for the speaker outputs.
IC601 Pin10(OVERDET) is showing the correct voltage. It goes to the fan control circuit and the speaker outputs after the relays.
All other pins on IC601 have the correct voltages.
I lifted R629 connected to IC601 Pin12 but it stills displays "OVERLOAD".
