Components Description - Kenwood KDC-C521FM Service Manual

KDC-C471FM/C521FM
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3 7 63 1515 0
CD PLAYER UNIT (X32-5470-01)
Ref. No. Application / Function
IC1 Servo IC
IC4 +5V AVR
IC5 Motor driver
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L 13942296513
Mechanism µ-COM
IC7
IC8 EEPROM
IC9 Reset IC
Q1 APC
Q4 0 bit mute (L CH.)
Q5 0 bit mute (R CH.)
Q6 Mute SW (L CH.)
Q7 Mute SW (R CH.)
Q8 A mute drive
Q9 Servo 5V AVR
Q10 P-ON 5V SW
Q11 Reset SW
Q13 CH CON SW
Q14 CH MUTE SW
Q16 SRV 8V AVR
Q17,18 SRV 8V AVR SW
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Q19 7/9V SW
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Q20 BU DETECTION SW
4

COMPONENTS DESCRIPTION

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
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.
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)
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.
Mechanism and servo control.
LPS data back-up memory.
When BU 5V voltage is less than 3.0V, IC outputs "Lo".
Laser diode auto power control.
When 0 bit mute is activated, an emitter goes "Hi", and Q4 outputs "Hi".
When 0 bit mute is activated, an emitter goes "Hi", and Q5 outputs "Hi".
When 0 bit mute or A mute drive is activated, a base goes "Hi", and L channel audio
signal is muted.
When 0 bit mute or A mute drive is activated, a base goes "Hi", and R channel audio
signal is muted.
When audio mute of IC7 is activated, a base goes "Lo", and audio mute drive signal is
outputted.
Q9 is combined with IC5's pin 26 and 27, and works as a driver of AVR.
While base goes "Lo", P-ON 5V is supplied to the microprocessor peripheral circuits.
When System Reset has activated, a base goes "Hi", and Q11 is turned on.
While CH CON or CH-CON2 mode is selected, a base goes "Hi", and Q13 is turned on.
When MUTE REQUEST to H/U is outputted, a base goes "Lo", and Q14 is turned on.
Q16 is combined with Q15 (X92-), and works as a pre-driver of AVR.
When Q18's base goes "Hi", Q17 is turned on, and SVR 8V AVR is working.
When a base goes "Hi", Q19 is turned on, and SVR 8V AVR is outputting +7V.
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When a base goes "Lo", Q19 is turned off, and SVR 8V AVR is outputting +8.5V.
While BACKUP is applied, a base goes "Hi", and Q20 is turned on.
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When momentary power down has detected, a base goes "Lo", and Q20 is turned off.
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Operation / Condition / Compatibility
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