Kenwood KDC-237SA Service Manual Download Page 38

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KDC-237SA/237SAY
KDC-237SG/237SGY

Indicates safety critical components.

Ref. No.

Parts No.

Description

Desti-

nation

Ref. No.

Parts No.

Description

Desti-

nation

PARTS LIST

N19-2163-04

FLAT WASHER (1.6X6X0.25)

N39-2020-48

PAN HEAD MACHINE SCREW (M2X2)

N09-6108-15

TAPTITE SCREW (M2X3.5)

N09-6155-15

SEMS (TAPTITE SCREW) (PT2X6)

E1 : KDC-237SA E2 : KDC-237SG E3 : KDC-237SAY E4 : KDC-237SGY
(E : Europe K : North America M : Other Areas W : Without Europe)

MECHANISM ASSY (X92-5860-00) DXM-6C00W

DM1

T42-1066-14

DC MOTOR (SPINDLE)

DM2

T42-1067-14

DC MOTOR (LOADING/SLED)

DPU1

X93-2130-01

OPTICAL PICKUP ASSY (LF)

DANGER:

Please do not look at the laser beam directly during

repair or operation check.

SPECIFICATIONS

FM tuner section

Frequency range (50kHz space) ........... 87.5MHz~108.0MHz

Usable sensitivity (S/N=26dB) ............................. 0.7µV/75

Ω

Quieting Sensitivity (S/N=46dB) ........................... 1.6µV/75

Ω

Frequency response (±3dB) .............................. 30Hz~15kHz

Signal to Noise ratio (MONO) ....................................... 70dB

Selectivity (DIN) (±400kHz) ........................................

≥

80dB

Stereo separation (1kHz) .............................................. 35dB

MW tuner section

Frequency range (9kHz space) ................. 531kHz~1611kHz

Usable sensitivity (S/N=20dB) ...................................... 25µV

LW tuner section

Frequency range ......................................... 153kHz~281kHz

Usable sensitivity (S/N=20dB) ...................................... 45µV

CD player section

Laser diode ............................................................... GaAlAs

Digital filter (D/A) .............................. 8 Times Over Sampling

D/A Converter ................................................................. 1Bit

Spindle speed ......................................... 500~200rpm (CLV)

Wow & Flutter .................................. Below Measurable Limit

Frequency response (±1dB) .............................. 10Hz~20kHz

Total harmonic distortion (1kHz) ................................. 0.01%

Signal to Noise ratio (1kHz) .......................................... 93dB

Dynamic range .............................................................. 93dB

Audio section

Maximum output power ............................................ 45W x 4

Output Power (DIN 45324, +B=14.4V) ..................... 28W x 4

Speaker Impedance ...................................................... 4~8

Ω

Tone action

Bass ................................................................. 100Hz±8dB

Middle ................................................................ 1kHz±8dB

Treble ............................................................... 10kHz±8dB

Auxiliary input

Frequency response (±1dB) .............................. 20Hz~20kHz

Input Maximum Voltage ............................................ 1200mV

Input Impedance ......................................................... 100k

Ω

General

Operating voltage (11~16V allowable) ......................... 14.4V

Current consumption ....................................................... 10A

Installation Size (W x H x D) ................... 182 x 53 x 155 mm

Weight ......................................................................... 1.40kg

KENWOOD follows a policy of continuous advancements
in development. For this reason specifications may be
changed without notice.

Summary of Contents for KDC-237SA

Page 1: ...T AUD SET UP TI AME MENU B BOOST AM FM SCRL Antenna adaptor T90 0523 05 SPARE TDF PANEL MAIN UNIT NAME TDF PARTS No TDF NAME KDC 237SA 237SAY Y33 2660 62 TDF 237A KDC 237SG 237SGY Y33 2660 63 TDF 237G DC cord E30 6427 05 Lever D10 4589 04 x2 Escutcheon B07 3122 01 Panel assy KDC 237SA 237SAY 237SG 237SGY A64 4059 02 Mounting hardware assy J21 9716 03 Carrying case W01 1685 05 ...

Page 2: ...O SW5 IC CN3 to GND S3 J1 SW5 AM B A8V TUNER FRONT END ANT DECODER RDS IC7 SW5 ANALOG SW IC9 E2PROM SW5 BU MECHA CD CONT SW Q401 A8V A8V PRE OUT MUTE BU5 SW5 DSI F AUX J2 PANEL DET Rx3 1 2W IC1 BU5 SW5 SW14V FL B IC4 POWER SUPPLY IC FL B J3 BU5 IC10 VFD DRIVER Q8 9 Q7 ELECTRIC UNIT X34 SWITCH UNIT X16 DPU1 CD PLAYER UNIT X32 598x xx BOARD X34 MOTHER E F A C B TR COIL FO COIL APC IC1 16 93MHz CLOCK...

Page 3: ...se goes Hi Q901 DC Offset DET ON when the base goes Hi after Q902 s and Q903 s outputs are separated Q902 903 DC Offset DET SW ON when the bases go Lo after IC6 s SP OUTs DC are separated SWITCH UNIT X16 386x xx Ref No Application Function Operation Condition Compatibility IC1 VFD Driver CD PLAYER UNIT X32 5980 00 Ref No Application Function Operation Condition Compatibility Focusing tracking sled...

Page 4: ...destruction prevention D4 Static Electricity Countermeasure Prevents malfunction by static electricity SYSTEM µ COM IC1 on X34 ELECTRIC UNIT Pin No Pin Name I O Application TruthValue Processing Operation Description Table 1 LX DATA M I O Data to slave unit Pull down GND 2 LX CLK I O LX BUS clock 125k 65kHz 3 5 NC Not used Output Lo fixed 6 REMO I Remote control signal input Detects pulse width 7 ...

Page 5: ...est from mechanism DSP H Data request 40 CD SRAMSTB O 1M bit SRAM standby H SRAM standby 41 EPM I Flash EPM input Connects to VSS 42 CD LOE LIM SW I CD detection Chucking SW H Loading completed L No disc 43 PON CD O CD mechanism power supply control H Power ON 44 CD LOEJ I O CD motor control q Refer to the truth value table 45 CD MOTOR I O CD motor control q Refer to the truth value table 46 VFD C...

Page 6: ...e then L 77 PWIC STBY O Power IC standby control Power ON H Power OFF L 78 PWIC MUTE O Power IC mute STANDBY source Momentary power down L TEL mute L 79 ACC DET I ACC power supply detection ACC found L No ACC H BU found L No BU Momentary power down H 80 BU DET I Detection of momentary power down Operates after less than 4ms after momentary power down is detected 81 82 NC O Not used Output L fixed ...

Page 7: ...Pin 86 Pin 85 2 4V 0V KDC 237SA 237SAY 237SG 237SGY r Power supply IC IC4 control SEL1 Pin 10 PS1 2 PS1 3 PS2 1 ILLUMI P CON P ANT L L L OFF OFF OFF L L H ON OFF OFF H L H ON ON OFF H H H ON ON ON SEL2 Pin 11 PS1 1 PS2 2 AUDIO SW5 AM L L OFF OFF H L ON OFF H H ON ON Pin No Pin Name I O Application TruthValue Processing Operation Description Table 96 AVSS 97 REF CON O VREF control Connects to VREF ...

Page 8: ... second When operating in the test mode even if a DC offset error occurs detection information is not written in the E2PROM When operating in the test mode CD mechanism error log information clear mode and DC offset error detection information clear mode do not perform DEMO mode operations Also do not display DEMO ON OFF option items in the MENU in STANDBY source in the above modes Forced disc eje...

Page 9: ...isplayed media 5 Disc EJECT times display E J C X X X X X Disc EJECT times display MAX 65535 times 5 While disc EJECT times is displayed press and hold for 2 seconds or longer to clear disc EJECT times 6 Panel open close P C X X X X X PANEL open close times display MAX 65535 times 6 times display Press the key for more than 2 seconds while the PANEL open close count is displayed and PANEL open clo...

Page 10: ...rrors is displayed in case there is no error CD Ejection E 1 X X J E R R Ejection error switch 1 error XX Number of errors is displayed in case there is no error information E 2 X X J E R R Ejection error switch 2 display XX Number of errors is displayed in case there is no error E 3 X X J E R R Ejection error switch 3 XX Number of errors is displayed in case there is no error E 4 X X J E R R Ejec...

Page 11: ... 1 A M 1 9 AUTO F 8 1 W M 1 9 Forced WIDE F 8 1 M M 1 9 Forced MIDDLE F 8 1 N M 1 9 Forced NARROW RDS auto measurement Add the process to replace the visual inspection of PS display previously done in the production line Status Display Description PS data reception R E S T D S T If displayed as shown at the left force to OFF P CON is recovered by Power OFF ON FST adjustment mode Perform FST soft m...

Page 12: ...cking Used media For CD KTD 02A Audio related test mode Procedure Note Press the AUD key main unit Enter audio adjustment mode the initial item should be Fader and then Balance Press the AUD and keys Remote control Bass Level Middle Level Treble Level System Q V Offset About audio adjustment items include both Audio Function Mode and Audio Setup Mode Procedure Item Procedure Description For item F...

Page 13: ...At normal termination key and ATT key reset start C D X At abnormal termination While is displayed power can be ON for 30 minutes This mode is cancelled by resetting The last screen will not be retained Data to be cleared is shown below CD mechanism information I2C communication status display CD mechanism error log display Displays CD loading error data Displays CD EJECT error data Displays CD ti...

Page 14: ...it X34 and for saving data to the new front end A1 Refer to ROM data transfer processes on the next page for details on front end A1 replacement procedures and on the data to be transferred Procedure Display Description While pressing and holding All lights ON 1 key and 3 keys reset start Press B BOOST key MENU R E A D O M R MENU mode Press key or key R E A D O M R Front end A1 Mother unit X34 Dat...

Page 15: ...is supplied as a service part in which data was inserted Data to be copied ROM correction data Other data Security data DEMO MODE ON OFF status POWER ON time For maintenance Playback time For maintenance EJECT count For maintenance Panel open close count For maintenance CD I2C status For maintenance CD offset error code For maintenance CD sound skips count For maintenance CD time code not updated ...

Page 16: ... µ COM IC1 Mother unit X34 r Press key Exit ROM data transfer mode Turn power off Remove front end A1 Install new front end A1 No ROM correction or other data status FRONT END A1 E2PROM E2PROM SYSTEM µ COM IC1 Mother unit X34 t FRONT END A1 E2PROM E2PROM SYSTEM µ COM IC1 Mother unit X34 y System µ COM IC1 copies data on the mother unit X34 into E2PROM in the front end A1 WRT OK In case of 2 or 3 I...

Page 17: ...ys press reset button Enter the system in the test mode Press B BOOST key ROM data System enters data trans fer mode Press or Select WRT Press key for 1 second or longer Data transfer FRONT END A1 E2PROM E2PROM SYSTEM µ COM IC1 Mother unit X34 e System µ COM IC1 copies the ROM correction data on the mother unit X34 into E2PROM in the front end A1 WRT OK1 W O1 FRONT END A1 E2PROM E2PROM SYSTEM µ CO...

Page 18: ... or other data status Turn power on Press and hold the 1 and 3 keys press reset button Enter the system in the test mode Press B BOOST key Enter the system in ROM data transfer mode Press or Select WRT Press key for 1 second or longer Data transfer Press key Exit ROM data transfer mode FRONT END A1 E2PROM E2PROM SYSTEM µ COM IC1 Mother unit X34 y System µ COM IC1 copies data on the mother unit X34...

Page 19: ...63 R72 C21 R21 R22 C11 C12 C15 R3 R4 W1 W2 C25 C24 CP11 R1 R2 R11 R13 R14 R15 R16 R17 R18 R19 R23 R70 R75 R78 W3 CP1 1 20 21 40 41 60 61 80 1 2 19 20 J1 D71 D72 D73 D74 D75 D76 D77 D79 Q1 Q2 IC1 SWITCH UNIT X16 386x xx J76 0360 02 J2 R J2 L KI4 KI1 KI2 KI5 KI3 LED B ILL D GND PAN SW5V KS1 KS4 GUARD FL SW11 25V PAN5V CW CCW KS2 GUARD AUX L AUX G AUX R FL B TDF DET SW5 CE RST ESD GND VFD DATAS VFD C...

Page 20: ...4 Q105 Q801 D102 D104 Q3 Q7 Q9 Q901 Q902 Q903 D301 IC1 IC8 IC2 IC3 W14 W100 W304 W102 W54 W802 W18 C7 W55 R109 W30 W20 W301 W52 C2 C5 C6 C15 C401 W803 C809 C805 C807 W804 W36 W48 W47 W26 W27 W28 W45 R101 1 16 8 9 R102 R106 W21 R116 R219 W305 R208 W6 W46 C301 C302 W66 C801 C802 C803 C804 C901 C902 C1 W42 W43 L1 C808 R1 W15 R2 R11 W5 R3 R15 R103 R107 R112 R209 R210 W51 W309 W308 R R330 R332 R333 R33...

Page 21: ...511 W98 W99 3 C513 W67 W71 R703 R704 R709 R710 W75 W70 W69 W90 C308 W66 C603 C701 C702 C705 C706 C802 W95 W101 C403 R209 R323 R329 R333 R334 R336 R337 R338 R339 R341 R343 R344 R345 R346 W74 R508 R601 R602 R603 R605 R606 R607 R608 R609 R610 R611 R612 R705 R706 R711 R712 W89 X3 W73 W68 W78 W79 W77 W96 W94 W93 W92 W91 W88 W81 W80 W84 R404 W82 W87 W86 W83 W76 W701 W72 3 D306 D603 A1 J4 J2 P1 D303 J5 D...

Page 22: ...2 C81 X2 CP4 C3 R28 R27 R24 CP1 GS D S D G E BC C E B B E B E E B S1 S2 S3 S4 Q6 D2 Q8 Q9 Q3 Q4 D1 CD PLAYER UNIT X32 5980 00 J76 0377 02 X32 5980 00 Ref No Address Q3 4Q Q4 5Q Q6 2Q Q8 2Q Q9 2Q PC BOARD COMPONENT SIDE VIEW Refer to the schematic diagram for the values of resistors and capacitors ...

Page 23: ... C22 R110 R101 R37 R39 C72 C74 R33 CP11 R23 R129 R128 R34 R59 R108 C1 1 15 16 30 4 5 1 3 1 24 G I O 16 1 96 97 128 33 64 65 32 1 BE BE E B OSC IN VR LD VCC PD C D A B TRK TRK GND SLD SLD A GND D GND S GND S7V DATA CLK 8EJE SRVMON1 SRVMON0 TX BCLK LRCK BCLK ASEL NPWDOWN SDA BU5V SPDL SRVM RST MRST MUTE MSTOP TP14 FDATA SPDL LOS SW SCLFCLK SPDL TRK FCS Lch TP24 A8V Rch P ON2 P ON1 GND RF ARF Vref TE...

Page 24: ...01 10u35 0 R958 R791 0 W701 0 R792 0 R793 330 R702 FL FR RR RL 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 RFGND ANTINPUT NC AM B OSCGND VT COM B IFC SDA SCL D GND VDD5V PLLGND SMETER AMIFOUT QUALITY RDSOUT D GND2 RDSMUTE STDGND R L IF B IFGND 0 01 C502 0 01 C504 0 01 C506 0 01 C508 4 7K R502 4 7K R504 470 R501 470 R503 SDA SCL 66 84 83 65 C510 0 47 C509 0 47 1 2 3 4 5 6 7 8 RD ...

Page 25: ... OUTRF OUTSW GND 1 2 3 4 5 6 7 8 9 10 SE3L SE3R SE2L SE2R SE1L SE1R DIFFL DIFFG DIFFR CREF 47u16 C401 1u50 C403 0 R971 FL RL RR FR L R GND RL FL RR FR 470 R403 SDA R L GND L 71 73 70 72 1 100 75 2 CH R CH G CH L 15K R903 330K R902 330K R901 100u16 C901 C902 R915 100u16 100K R905 100K R906 100K 22K R904 1 3 5 7 9 11 13 15 17 19 21 23 25 27 TAB1 PWGND1 STBY VCC1 PWGND2 SVR IN2 IN4 ACGND PWGND3 VCC2 ...

Page 26: ...REQ S RDS CLK LX REQ M LX MUTE LX CON LX RST ANALOG CON MUTE PON EXT GND TUN IFC OUT RDS AFS M VSS NC VCC2 RDS QUAL RDS DATA DSI NC ROTARY CW ROTARY CCW CD DISC12 SW CD MUTE NC NC NC VFD SYS DATA VFD PAN DATA VFD CLK VFD BLK CD SDA CD SI CD SCL CD SO NC BUCK CD LOS SW PIO0 CD MSTOP SRAMSTB EPM CD LOE LIM SW PON CD CD LOEJ CD MOTOR VFD CE LCD CE CD DRIVEMUTE CD CCE CD DISC8 SW CD MRST LX DATA M LX ...

Page 27: ...DA7419 KKZ09Z YES YES 22K 47K 47K YES 22K 2 2K YES YES KDC MP3036AX X34 4630 22 M8 YES YES YES YES YES YES YES YES YES YES E TDA7419 KKZ09Z YES YES 47K 47K YES 22K 2 2K YES YES YES YES M3 M4 KDC MP336AX AXS X34 4630 23 YES YES YES YES YES YES YES YES YES YES E TDA7419 KKZ09Z YES YES 47K 47K 22K YES 22K 2 2K YES YES YES YES KDC MP436AX X34 4630 22 M2 YES YES YES YES YES YES YES YES YES YES E TDA741...

Page 28: ...220 R13 220 R14 220 R15 220 R16 220 R17 100 R19 1K R18 2 2 C10 28 27 32 30 29 31 34 33 36 35 40 38 37 39 41 43 42 58 47 45 44 46 50 48 49 52 51 53 54 55 57 56 61 59 60 63 62 64 TP165 R80 47 R82 47 1 2W 1 2W 65 66 12 14 13 5 10 11 9 7 8 6 4 2 3 1 S8 S7 S9 S10 S13 S11 S12 S14 S15 S6 S5 S29 S41 S50 S51 S52 S49 S47 S48 S45 S46 S44 G3 S43 G1 S42 G3 S39 S38 S37 S36 S35 S33 S31 S32 S30 S23 S28 S27 S26 G2...

Page 29: ... 0650 05 YES YES YES YES B30 1767 05 YES 820 YES 560 YES YES E11 0650 05 YES YES YES YES B30 1767 05 YES 820 YES 560 YES YES B30 1566 05 YES B30 1566 05 YES 680 YES YES 470 YES E11 0649 05 YES B30 1566 05 B30 1565 05 YES B30 1566 05 YES 680 YES 470 E11 0649 05 YES B30 1565 05 B30 1565 05 YES B30 1565 05 YES 680 YES 470 YES E11 0649 05 YES B30 1565 05 B30 1565 05 YES B30 1565 05 YES 680 YES 470 YES...

Page 30: ... OUTSL 25 LDIN CNT 23 22 R60 C35 1000P N C R58 2 2K N C N C 31 32 N C N C 34 33 35 6800P 62 15K FCS R59 27K 69 SLED C36 R62 R61 15K 13K 4 3 N C SDRCK N C N C 37 36 38 N C N C 40 39 41 44 N C N C 42 43 N C N C NCAS 45 46 12EJE SW TP24 LOS 12EJE LOS SW 22 23 N C 24 R24 100 1 4 3 2 A2 GND A1 A0 C17 0 1 R106 2 2 FDATA SDA 8 5 6 7 SCL SDA WP VCC SCL FCLK 100 CP3 120 119 CP1 OUT C4 1 GND IN 0 1 C5 A3 3V...

Page 31: ...RFFB ARFOUT ARFDC AVDD2 87 RFIN 86 89 88 ARFIN 91 90 IREF DSLF 93 92 ARF C55 0 33 RF C58 680P C57 0 1 PLLFO VCOF 95 PLLF 94 96 2 7K R79 R78 820 C63 1000P C64 0 33 1 16 9344MHz X1 X2 R103 2 2 IOP IOP VC 2 GND 12 FCS UP TRK IN TRK OUT FCS DOWN 15 16 14 13 TRK FCS TRK FCS A GND2 LD VR PD C D S GND C D 7 B F 11 10 A E 9 8 F B A E 6 5 4 3 PD VR GND LD VC 1 VCC 78 76 80 81 75 77 78 75 76 80 77 81 1000P ...

Page 32: ...N09 6108 15 N09 6155 15 φ2x8 M1 6x6 0 M1 7x2 5 M2x2 φ2x5 BLK 1 6 WASHER M2x2 φ2x3 5 φ2x6 858 K K 52 F X32 DM1 14 24 DFPC1 28 25 16 29 19 31 26 13 12 10 30 27 42 11 17 18 23 45 38 DM2 1 850 849 806 834 807 44 39 40 15 22 G 55 51 8 33 809 36 33 Jx2 H 5 37 53 2 37 43 43 56 37 F F 37 43 43 E Cx2 41 32 35 Ax2 DPU1 B Parts with the exploded numbers larger than 700 are not supplied ...

Page 33: ...34 A1 F1 FC1 DME1 A B C D E F G H J N24 3015 48 N80 2006 48 N80 2008 43 N83 3005 48 N86 2610 48 N80 3010 48 N83 3005 48 N83 3020 48 N86 2606 48 242 269 209 223x2 D Dx2 Hx2 Ex2 C C Cx2 A F H G 772 D D D B B F J X34 786 732 701 PA1 261 259 257 256 213 210 241 255 708 253 238 252 251 705 771 254 226 725 206 204 237 222 236 221 224 207 DC1 268 ...

Page 34: ...APTITE SCREW E 3D N86 2610 48 BINDING HEAD TAPTITE SCREW 268 1C T90 0523 05 ANTENNA ADAPTOR 269 1C W01 1685 05 CARRYING CASE DME1 1D X92 5860 00 MECHANISM ASSY DXM 6C00W D1 B30 1566 05 LED 1608 RED D3 4 B30 1565 05 LED 1608 PG E2E4 D3 4 B30 1566 05 LED 1608 RED E1E3 D6 9 B30 1565 05 LED 1608 PG E2E4 D6 9 B30 1566 05 LED 1608 RED E1E3 D11 22 B30 1566 05 LED 1608 RED E1E3 D31 42 B30 1565 05 LED 1608...

Page 35: ...2A153J CHIP R 15K J 1 10W R62 RK73GB2A133J CHIP R 13K J 1 10W R63 RK73GB2A183J CHIP R 18K J 1 10W R64 RK73GB2A392J CHIP R 3 9K J 1 10W R65 66 RK73GB2A153J CHIP R 15K J 1 10W R73 RK73GB2A910J CHIP R 91 J 1 10W R74 RK73GB2A472J CHIP R 4 7K J 1 10W R75 RK73FB2B4R7J CHIP R 4 7 J 1 8W R76 RK73GB2A104J CHIP R 100K J 1 10W R77 RK73GB2A823J CHIP R 82K J 1 10W R78 RK73GB2A821J CHIP R 820 J 1 10W R79 RK73GB...

Page 36: ...RK73GB2A393J CHIP R 39K J 1 10W R112 RD14BB2C203J RD 20K J 1 6W R113 RK73GB2A104J CHIP R 100K J 1 10W R114 115 RK73GB2A103J CHIP R 10K J 1 10W R116 117 RD14BB2C103J RD 10K J 1 6W R203 204 RK73GB2A103J CHIP R 10K J 1 10W R205 207 RK73GB2A473J CHIP R 47K J 1 10W R208 RD14BB2C473J RD 47K J 1 6W R209 210 RD14BB2C471J RD 470 J 1 6W R212 RK73GB2A473J CHIP R 47K J 1 10W R214 RK73GB2A223J CHIP R 22K J 1 1...

Page 37: ... Q101 103 2SC4081 TRANSISTOR Q104 105 RT1N441M TRANSISTOR Q301 RT1P144M TRANSISTOR Q302 RT1N144M TRANSISTOR Q901 2SC4081 TRANSISTOR Q902 903 2SA1576A TRANSISTOR TH1 PRF18BE471QS2 POSITIVE RESISTOR A1 2D X86 4032 70 FRONT END UNIT 1 2B A10 5328 11 CHASSIS 2 1B A10 5329 01 CHASSIS 5 2B D10 4910 13 ARM ASSY 8 2A D10 4911 03 LEVER ASSY 10 2A D10 4906 33 ARM 11 2A D10 4907 33 ARM 12 3A D10 4908 03 ARM ...

Page 38: ...dB 30Hz 15kHz Signal to Noise ratio MONO 70dB Selectivity DIN 400kHz 80dB Stereo separation 1kHz 35dB MW tuner section Frequency range 9kHz space 531kHz 1611kHz Usable sensitivity S N 20dB 25µV LW tuner section Frequency range 153kHz 281kHz Usable sensitivity S N 20dB 45µV CD player section Laser diode GaAlAs Digital filter D A 8 Times Over Sampling D A Converter 1Bit Spindle speed 500 200rpm CLV ...

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