4
DPX501/501U/501UY
DPX-MP2090U
COMPONENTS DESCRIPTION
●ELECTRIC UNIT (X34-415x-xx)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 System µ-COM
Controls FM/AM tuner, the changer, CD mechanism, panel, volume and tone.
IC2 E-VOL Controls the source, volume, tone.
IC3 A8V REF Power Supply Outputs 1.27V.
IC4 Power IC Amplifies the front L/R and the rear L/R to 50W maximum.
IC5 ILLUMI+B Power Supply Outputs 11.25V.
IC6 Muting Logic IC Controls logic for muting.
IC7 Reset IC “Lo” when detection voltage goes below 3.6V or less.
IC8 Hi-side SW Over current protection of USB power supply.
When pin 1 goes “Hi”, USB5V is ON.
IC9 RDS IC Decodes RDS.
IC10 Installer Memory IC Installer memory.
IC12 SW Regulator Supplies power for USB and CD mechanism.
IC13 FL+B Power Supply Outputs 3.0V.
Q1,2 B.U.5V AVR While BU is applied, BU5V AVR outputs +5V.
Q3,11 SW5V When Q11’s base goes “Hi”, SW5V outputs +5V.
Q4,9 SW14V When Q9’s base goes “Hi”, SW14V outputs 14V.
Q5,6,10 AUDIO8V AVR When Q10’s base goes “Hi”, A8V AVR outputs 8.0V.
Q7,8 SERVO+B AVR When Q8’s base goes “Hi”, S+B AVR outputs 7.5V.
Q12,21 Serge Protect for IC12 Outputs 20V when BU is over 20V.
Q13 PANEL5V When the base goes “Lo”, PANEL5V outputs 5V.
Q17 IC12 ON/OFF When the base goes “Lo”, IC12 is“ON”.
Q101,102 P-ANT SW When Q102’s base goes “Hi”, P-ANT SW outputs 14V.
Q103,106 P-CON SW When Q106’s base goes “Hi”, AVR outputs 14V.
Q104,105 P-CON Protection Output protection is applied when P-CON output voltage fall is detected.
The 2 transistors protect Q103 false operation when P-CON SW is “ON”.
Q107 EXT-AMP-CON When the base goes “Lo”, Q107 is turned on.
Q108 Small Lamp DET SW When the base goes “Hi”, Q108 is turned on.
Q109 Serge DET When the base goes “Hi”, IC4 is changed into standby source.
Q111 BU DET When the base goes “Hi”, Q111 is turned on.
Q112 ACC DET When the base goes “Hi”, Q112 is turned on.
Q113 Mute Driver When the base goes “Hi”, pre-out mute driver is turned on.
Q116 Pre-out Mute Driver When the base goes “Lo”, mute driver is turned on.
Q300,301 AM+B When Q301’s base goes “Hi”, AM+B is output.
Q302,303 Tuner8V When Q303’s base goes “Hi”, Tuner8V outputs 8V.
Q305,306 SW ILLUMI+B When Q306’s base goes “Hi”, SW ILLUMI+B outputs 11V.
Q400~403 Pre-out Mute SW When the base goes “Hi”, pre-out is muted.
Q406,407
Q408 Pre-out Mute ON/OFF When the base goes “Lo”, pre-out mute is "ON".
