KDC-C471FM/C521FM
4
CD PLAYER UNIT (X32-5470-01)
Ref. No.
Application / Function
Operation / Condition / Compatibility
RF amplifier built in digital servo and data processor IC. Focusing, tracking, sled and
spindle servo processing. Detection of dropout, anti-shock, track crossing and off-track
IC1
Servo IC
conditions.
Automatic adjustment (focusing, tracking, gain, offset and balance) operations.
Digital signal processing (DSP, PLL, sub-codes, CD-TEXT decode, CIRC error
correction, audio data interpolaration) operations.
IC4
+5V AVR
Analogue output circuit power supply for D/A converter.
Focusing coil, tracking coil, spindle motor and sled motor driver.
VO1~VO4 and VOL outputs ON/OFF function.
While MUTE1 goes "Hi", VO1 outputs are turned on.
While MUTE2 goes "Hi", VO2~VO4 and VOL outputs are turned on.
VIN1 amplifier function (input selection and VREF selection)
IC5
Motor driver
1. Input selection.
While VIN SW terminal goes "Lo", IC pin 15, 16 and 17 inputs are selected.
While VIN SW terminal goes "Hi", IC pin 15, 18 and 19 inputs are selected.
2. VREF selection.
While VIN SW terminal goes "Lo", internal VREF (2.5V typical) is selected.
While VIN SW terminal goes "Hi", external VREF (IC pin 30 input) is selected.
IC7
Mechanism
µ-COM
Mechanism and servo control.
IC8
EEPROM
LPS data back-up memory.
IC9
Reset IC
When BU 5V voltage is less than 3.0V, IC outputs "Lo".
Q1
APC
Laser diode auto power control.
Q4
0 bit mute (L CH.)
When 0 bit mute is activated, an emitter goes "Hi", and Q4 outputs "Hi".
Q5
0 bit mute (R CH.)
When 0 bit mute is activated, an emitter goes "Hi", and Q5 outputs "Hi".
Q6
Mute SW (L CH.)
When 0 bit mute or A mute drive is activated, a base goes "Hi", and L channel audio
signal is muted.
Q7
Mute SW (R CH.)
When 0 bit mute or A mute drive is activated, a base goes "Hi", and R channel audio
signal is muted.
Q8
A mute drive
When audio mute of IC7 is activated, a base goes "Lo", and audio mute drive signal is
outputted.
Q9
Servo 5V AVR
Q9 is combined with IC5's pin 26 and 27, and works as a driver of AVR.
Q10
P-ON 5V SW
While base goes "Lo", P-ON 5V is supplied to the microprocessor peripheral circuits.
Q11
Reset SW
When System Reset has activated, a base goes "Hi", and Q11 is turned on.
Q13
CH CON SW
While CH CON or CH-CON2 mode is selected, a base goes "Hi", and Q13 is turned on.
Q14
CH MUTE SW
When MUTE REQUEST to H/U is outputted, a base goes "Lo", and Q14 is turned on.
Q16
SRV 8V AVR
Q16 is combined with Q15 (X92-), and works as a pre-driver of AVR.
Q17,18
SRV 8V AVR SW
When Q18's base goes "Hi", Q17 is turned on, and SVR 8V AVR is working.
Q19
7/9V SW
When a base goes "Hi", Q19 is turned on, and SVR 8V AVR is outputting +7V.
When a base goes "Lo", Q19 is turned off, and SVR 8V AVR is outputting +8.5V.
Q20
BU DETECTION SW
While BACKUP is applied, a base goes "Hi", and Q20 is turned on.
When momentary power down has detected, a base goes "Lo", and Q20 is turned off.
COMPONENTS DESCRIPTION
