KAC-X40
3
●AUDIO UNIT (X09-8580-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Rch input buffer at side A and isolation Rch input signal amplification (+6dB) and noise reduction in transmission
quality at side A
IC2 Lch input buffer at side A and isolation Lch input signal amplification (+6dB) and noise reduction in transmission
quality at side A
IC3 L/Rch input buffer at side B Input signal amplification (+6dB) at side B
IC4 L/Rch isolation at side B Noise reduction in input signal transmission quality at side B
IC5 DC/DC control Controlled by P-CON & protection circuit
IC6 ATT Detects inside temperature and makes the necessary ATT.
Q1,15,17 +15VAVR Operation while P-CON is turned on.
Q2,16 -15VAVR Operation while P-CON is turned on.
Q3~8 DC/DC Controlled by IC5.
Q9~12 DC/DC driver Controlled by IC5.
Q13,14 DC/DC delay start circuit Delays the start of DC/DC when P-CON is turned on.
Q201~204,401~404 ACLASS initial stage Voltage amplification of small signal
Q205~210,407~410 ACLASS second stage Voltage amplification of small signal
Q211,212,411,412 Constant current circuit Makes current in ACLASS initial stage constant.
Q215,216,415,416 Over current limiter Operation under the over current condition
Q217,218,417,418,610 Over current protection Operation under the over current condition
Q220,222,223,225,423, AMP final stage Current amplification of small signal
Q425,426,428
Q241,242,443,444 AUDIO MUTE Controlled by Q603.
Q280,282,283,290, ATT Controlled by IC6.Takes the level of -1.5dB or 3dB in response to
Q481~484 changes in temperature (TH601-605)
Q601~606 P-CON control Operates when P-CON is turned on/off.
Q611~614 DC protection Operates when DC is detected in the SP output.
Q615~618 POP MUTE Operation while P-CON is turned on.
Q619,620 LED driver Operation while P-CON is turned on.
Q621 Power switch for thermistor Operation while P-CON is turned on.
Q684,685 FAN AVR Operation while P-CON is turned on.
ADJUSTMENT
NO. ITEM ALIGNMENT METHOD ALIGN FOR NOTE
POINT
VR1 (A Lch) Connect a DC
1IDEL VR2 (A Rch) voltmeter between 2.0mV After Power on 5minutes
CURRENT VR3 (B Lch) check land
VR4 (B Rch) (Refer to PC BOARD)
COMPONENTS DESCRIPTION
