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Page 2: ...01 5 6 7 plus transistor V201 works as a Schmitt trigger with ON level approx 7V OFF level approx 5V The input pin 5 senses a DC voltage which is obtained via diode D211 capacitor C206 Transistor V201 drives relay K101 which connects power to the audio circuits in A4 14 When switch S201 is in AUTO position relay K101 will open about 5 minutes after the signal at the input disappears The time relay...
Page 3: ...ng type acts as operational amplifier for the treble control R510 which is active above 5kHz POWER AMPLIFIER CIRCUITS 1 8 Power Stage For Woofers The signal is coupled via C703 to the input of the power amplifier From the output the signal is fed back negatively via R 709 C704 When the signal amplitudes are large negative feedback also is provided via a network of resistors diodes The output signa...
Page 4: ...ometer R722 or R617 till DC voltage between emitters of V710 V711 reads 10mV Or voltage between V610 V611 reads of 20mV which corresponds to 23mA bias current NOTE When output transistors are replaced heat sink compound must be applied to both sides of the insulation washers to the temperature compensating transistors Check that insulation is adequate that the power transistors are mounted flat ag...
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