Kenwood KAC-PS521 Service Manual page 3

Ref. No
IC5 H/U communication buffer
IC6 Microprocessor
IC7 Reset IC
IC8 E2PROM
IC9 Current detection
IC10 Isolation amplifier
Q50 5V AVR
Q51~54 DC/DC output driver
Q55~60 DC/DC
Q61 +15V AVR
Q62,63 -15V AVR
Q64,65 DC/DC converter (IC2) ON/OFF
Q66,68 5V AVR
Q69 5V AVR ON/OFF
Q70,71 Power supply detection
Q81 +15V AVR
Q91,92 When P-CON is OFF, DC/DC driver stop speedy
Q97 AMP communication stability power supply
Q101,102 Mute
Q103~112 A class first stage amplifier
Q113~118 A class 2nd stage amplifier
Q119,120 Final temperature compensation
Q121~124 Amplifier current detection
Q125~132 Final driver
Q133~140 Final
Q141 Mute control
Q142~145 Amplifier limiter
Q146,147 Amplifier current detection
Q148,149 DC detection
Q301~307 H/U communication output driver
Q313 H/U communication output driver
Q314 H/U communication ON/OFF
Q341~344 H/U communication input driver
Q346 H/U communication output driver
Q347~349 AMP and H/U communication ON/OFF control
Q351,352 BATT voltage output
Q353~358 Fan stability power supply
Q403 LCD backlight LED control
Q404 LED control
COMPONENTS DESCRIPTION
Application / Function
KAC-PS521/X521
Operation / Condition / Compatibility
Controlled by microprocessor
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