Kenwood kac-X1R Service Manual

Also see for KAC-X1R - eXcelon Amplifier: Training guide Instruction manual Instruction manual Instruction manual

Contents

KAC-PS1D/X1R4Ref. No. Application / Function Operation / Condition / CompatibilityQ8 Pcon Switch Places the amplifier in the ON condition by sending “L” to pin 1 of the μ-com when the Pconterminal becomes “H” while the battery voltage is in the normal range.Q10,11 DD converter gate control Turns ON/OFF DD converter gate drive pulse in response to the output from pin 8(Power_On) of the μ-com.Q13~16 DD converter gate driver Drives the switching FET gate in the DD converter.Q17~20, DD converter switching FET Repeats switching the transformer’s primary side to generate high voltage at the secondaryQ22~24,27 side.Q25,26 +15V constant voltage In order to compensate HFE in Q26, both TRs in Q25 are connected with the Darlingtonpower supply connection and the constant voltage of +15V is obtained.Q28,32 -15V constant voltage In order to compensate HFE in Q28, both TRs in Q32 are connected with the Darlingtonpower supply connection and the constant voltage of -15V is obtained.Tracking when -15V constant Adjusts the voltage drop in the -15V constant voltage power supply to the voltage in +15VQ29,30 voltage power supply is side while the power OFF.turned OFFQ31,33,34 +15V constant voltage Power supply for the gate drive signal in the output FET high side.power supply for high voltageQ36~38, Power supply for FAN In order to compensate HFE in Q38 and Q83, Q41 and Q36 are connected with theQ41,83 Darlington connection in Q37 to turn ON/OFF by the μ-com.Q39 Limiter level control When 1Ω load is detected, CEs are ON and the voltages at pins 1 and 7 of IC24 are droppedin order to limit the signal amplitude.Q42~45,Q156~167, PWM shaping circuit Generates the pulse signal for the gate drive of the high side and low side.Q188~193Q168~171, FET for output Generates the PWM output waveform by the switching.Q184~187Q47,48 Power supply SW for FL Turns ON/OFF the FL power supply from pin 22 of the μ-com.Q50~53 Constant voltage power Supplies the constant voltage of 2.3V to the FL filament.supply for FL filamentQ54,55 Constant voltage power Turns ON/OFF the FL filament power supply from pin 22 of the μ-com.supply SW for FL filamentQ101,129 MUTE Mutes the audio signal from pin 56 of the μ-com to prevent applying the shock noise.Q102, ATT Lowers the volume when temperature at the output FET or in the vicinity of the transformerQ131~133 increases. For 1.5dB respectively.Q125,126 ADV Reads the power supply voltage value to show it with the FL. Turns OFF when the powersupply is OFF to save the backup current.Q150,151 D-SW Turns ON/OFF the D-class amplifier stage from the μ-com or protection.Q179,180 DC detection Turns ON when DC is detected at the SP terminal and sends it to pin 64 of the μ-com.Q181,182 ASO detection Voltage amplification circuit used when the ASO is detectedQ174, Ground fault detection When SP+ or SP- output is shorted to the ground, sends the signal to pin 6 of the IC7 andQ176~178 protects against the ground fault.Q175 ASO detection Current amplification circuit used when the ASO is detectedQ603 LOGO-LED Turns on the LOGO LED from pin 4 of the μ-com.COMPONENTS DESCRIPTION