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
1
IDEL
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
