3
KAC-7204
Ref. No.
Application / Function
Operation / Condition / Compatibility
Q201~204
Differential
fi
rst stage ampli
fi
er
Q205~208
Differential second stage ampli
fi
er
Q209,210
Differential second stage current mirror
Q211,213
Temperature compensation Tr
Q215~218
Current limiter
Q220,222~227,229
Power ampli
fi
er
fi
nal Tr
Q241,242
mute_Tr
Mute_on when is ON
Q251~258
Power ampli
fi
er driver
Q281,282
ATT2_Tr
The signal level becomes -3dB when is ON
Q283,284
ATT1_Tr
The signal level becomes -1.5dB when is ON
Q602
Mute control
ON when is pcon_off
Q603,698
Power supply for the mute_Tr
Q604
SW14V
Power supply for DC/DC_IC
Q605
Pcon control
ON by pcon=H
Q606
Over voltage detection
Turn off Q605 when over voltage is detected
Q609
Power supply for FAN
Q610
Over current protection
Q611,612
DC protection
Q613,614
Latch circuit for DC protection
Hold the protection operation while the DC protection is being operational
Q615,616
Shock noise prevention circuit
Q617,618
Shock noise prevention circuit control
NO.
ITEM
ALIGNMENT POINT
METHOD
ALIGN FOR
NOTE
1
IDLE
CURRENT
VR5 (Lch)
VR6 (Rch)
Connect a DC voltmeter between check land.
Lch:
Q223_emitter
↔
W148
Rch:
Q224_emitter
↔
W21
2.5mV
after 5minutes from power on
ADJUSTMENT
VR6
VR5
X09-876
Q227
Q223
W148
R245
DC voltmeter
Lch 2.5mV
Q224
Q220
Rch
Lch
+
-
W21
R243
DC voltmeter
Rch 2.5mV
-
+
COMPONENTS DESCRIPTION
