KAC-8403
3
COMPONENTS DESCRIPTION
ADJUSTMENT
No. ITEM ALIGNMENT POINT METHOD ALIGN FOR NOTE
VR1 (ALch) Connect a DC voltmeter
1IDLE VR2 (ARch) between check land 2.5mV After Power on
CURRENT VR3 (BLch) (Refer to PC BOARD) 5 minutes
VR4 (BRch)
●PREAMPLIFIER UNIT (X08-4200-12)
Ref. No. Application / Function
IC1 (2/2) ARch reversal buffer
IC1 (1/2) BRch reversal buffer
IC4 Bch HPF
IC5 Ach HPF
IC6 Bch LPF
IC7,8 Bch Bass boost filter
●AUDIO UNIT (X09-5840-12)
Ref. No. Application / Function
IC1,2 Input isolation amp
IC4 Switching regulator controller
IC6 For temperature protection and -3dB attenuator
comparators
Q1 For +15.6V AVR
Q2 For -15.6V AVR
Q4,5,7,8 DC/DC converter FET
Q9~12 For FET driving
Q13,14 FET drive low start SW
Q201~210
For ACH voltage amplifying step differential amplifying
Q211 For temperature compensation bias
Q212
For ACH voltage amplifying step differential amplifying
Q213 For temperature compensation bias
Q214~219
For ACH voltage amplifying step differential amplifying
Q220 For ACH final current amplifying
Ref. No. Application / Function
Q221
For ACH voltage amplifying step differential amplifying
Q222,223 For ACH final current amplifying
Q225 For ACH final current amplifying
Q241,242 Mute
Q280 -3dB Attenuator circuit
Q282 -3dB Attenuator circuit
Q401~410
For BCH voltage amplifying step differential amplifying
Q411,412 For temperature compensation bias
Q415~422
For BCH voltage amplifying step differential amplifying
Q423~426 For BCH final current amplifying
Q443,444 Mute
Q481,482 -3dB Attenuator circuit
Q601 For shock noise prevention
Q602 P-CON ON/OFF processing
Q603 Mute driver
Q604 +B SW
Q605 P-CON ON/OFF processing
Q606 For BU excess voltage detection
Q607 FAN +B, Always ON
Q610 For excess current detection and excess current
protection
Q611~614 For output DC abnormal voltage detection
Q615~618 For shock noise prevention
Q619,620 Logo LED power supply
Q621~628 For temperature detection
