The Harman Kardon CA260 Hi-Fi car amplifier schematic diagram and adjustments

 

60 watts per channel into 4 Ohms

90 watts per channel into 2 Ohms

180 watts bridged mono into 4 ohms

HARMAN CARDON CA260 HI FI CAR AUDIO AMPLIFIER

PROTECTION CIRCUIT

If the temperature inside the CA260 rises above 80 the protection circuit comes into operation, decreasing output. At this time the protect indicator blinks. If the temperature comes back below 80 C by natural cooling,
output returns as it was.
If the temperature rises above 100 , the power supply circuit is shut off . Not only does the output stop, but also the protect indicator goes out. If this happens, it is possible that the CA260 is broken. However, even in
this state, it cannot be always said that it is broken because the unit may operate when the temperature comes back below 80 C by natural cooling.

Protection circuit schematic

-Idling current adjustment
Conditions: Connect the DC voltmeter between TPl and TP2 and between TP3 and TP4.
-Connect a 13. 8V power supply to the 12V Battery Power In terminal.
-After the power on, wait for 5 minutes before measuring to be sure of the most stable operation.

Inspection:
-Confirm that the idling current is 50mA :t 20mA (voltage: 33mV:t 13mV).
If the current measured does not fall within the range specified , adjust it with the procedure below.

Schematic diagram