SERVICE MANUAL Chinese Model HCD-VX550 is the Amplifier, Video CD player, Tape Deck and Tuner section in MHC-VX550. Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation. DOLBY and the double-d symbol a are trademarks of Dolby Laboratories Licensing Corporation. CD Section Model Name Using Similar Mechanism CD Mechanism Type Base Unit Name NEW CDM38LH-5BD36L BU-26BD36L Optical Pick-up Name KSS-213D/Q-RP Tape deck Section Model Name Using Similar Mechanism Tape Transport Mechanism Type HTC-V5550 TCM-230AWR2 Amplifier section The following measured at AC 120, 220, 240 V 50/60 Hz DIN power output (rated)110 110 W (8 Ω at 1 khz, DIN) Continuous RMS power output (reference) 140 140 W (8 Ω at 1 khz, 10% THD) Inputs MD IN: (phono jacks) VIDEO (AUDIO) IN: (phono jacks) MIC 1/2 (phone jack): voltage 450 mv, impedance 47 kω voltage 250 mv, impedance 47 kω sensitivity 1 mv, impedance 10 kω SPECIFICATIONS Outputs MD OUT (phono jacks): voltage 250 mv impedance 1 kω VIDEO OUT (phono jack): max,output level 1Vp-p, unbalanced, Sync negative, load impedance 75 Ω S-VIDEO OUT (4-pin/ mini-din jack): Y: 1Vp-p, unbalanced, Sync negative, C: 0.286Vp-p, load impedance 75 Ω PHONES (stereo phone jack): accepts headphones of 8 Ω or more SPEAKER: accepts impedance of 8 to Ω SUPER WOOFER Voltage 1 V, impedance1 kω SUPER VIDEO CD/VIDEO CD /CD player section System Compact disc and digital audio and video system Laser Semiconductor laser (λ=780nm) Emission duration: continuous Laser output Max. 44.6 µw* *This output is the value measured at distance of 200 mm from the objective lens surface on the Optical Pick-up Block with 7 mm aperture. Frequency response 2 Hz - 20 khz (±0.5 db) Wavelength 780-790 nm Signal-to-noise ratio More than 90 db Dynamic range More than 90 db Video color system format NTSC, PAL Continued on next page MINI Hi-Fi COMPONENT SYSTEM MICROFILM
7-4. SCHEMATIC DIAGRAM BD BOARD Refer to page 29 for Waveforms. Refer to page 45, 46 for IC Block Diagrams. (Page 26) Voltages and waveforms are dc with respect to ground under no-signal conditions. no mark : CD STOP ( ) : CD PLAY The components identified by mark! or dotted line with mark! are critical for safety. Replace only with part number specified. 25 25
7-5. SCHEMATIC DIAGRAM VIDEO (1/2) BOARD Refer to page 29 for Waveforms. Refer to page 52 for IC Pin Function Description. Refer to page 28 for Printed Wiring Board. (Page 25) (Page 36) Voltages and waveforms are dc with respect to ground under no-signal conditions. no mark : VIDEO CD PLAY 26 26
7-6. SCHEMATIC DIAGRAM VIDEO (2/2) BOARD Refer to page 29 for Waveforms. Refer to page 54 for IC Pin Function Description. Refer to page 47 for IC Block Diagram. Refer to page 28 for Printed Wiring Board. IC504 3.3V REG Voltages and waveforms are dc with respect to ground under no-signal conditions. no mark :VIDEO CD PLAY : Impossible to measure 27 27
7-9. SCHEMATIC DIAGRAM CD MOTOR SECTION Refer to page 46 for IC Block Diagrams. DISC TRAY ADDRESS DETECT DISC TRAY SLIDE CLOSE OPEN B (Page 36) (DISC TRAY SLIDE) DISC TRAY TURN DISC IN DETECT SENSOR DISC TRAY SENSOR DISC TRAY TURN MOTOR DRIVER C (Page 36) LEVEL SHIFT Voltages are dc with respect to ground under no-signal conditions. no mark : CD STOP 31 31
7-11. SCHEMATIC DIAGRAM AUDIO BOARD Refer to page 48 for IC Block Diagram. (PLAYBACK) PB EQ AMP (DECK A) PB LEVEL (L) (DECK A) PB LEVEL (R) (DECK A) PB EQ AMP (DECK B) PB LEVEL (L) (DECK B) PB LEVEL (R) (DECK B) D (Page 38) SWITCHING REC BIAS (R) (DECK B) REC BIAS (L) (DECK B) REC BIAS BIAS OSC -6.8 Voltages are dc with respect to ground under no-signal conditions. no mark : TAPE PLAY ( ) : RECORD The components identified by mark! or dotted line with mark! are critical for safety. Replace only with part number specified. 33 33
7-12. PRINTED WIRING BOARD LEAF SW BOARD Refer to page 23 for Circuit Boards Location. Semiconductor Location (DECK A PLAY) 4 (CAPSTAN) 1 2 DECK B PLUNGER DECK A PLUNGER (DECK A 120/70) (DECK A HALF) DECK A PLUNGER ( ) 3 4 (DECK A HALF) (DECK A 120/70) (DECK A REC) 7-13. SCHEMATIC DIAGRAM LEAF SW BOARD ROTATION DETECT SENSOR (DECK A) E (Page 35) CONTROL SWITCH (DECK B PLAY) ROTATION DETECT SENSOR (DECK B) (DECK B HALF) 3 1 2 DECK B PLUNGER (DECK B 120/70) (DECK B REC) 12 12 Ref. No. Location D141 E-10 D191 D-12 D331 E-1 D333 F-1 D334 E-1 D335 F-1 D401 G-11 D403 F-12 D405 H-6 D406 I-4 D407 I-2 D411 G-1 D501 D-7 D502 E-6 D503 D-6 D504 D-7 D505 D-7 D506 D-7 D507 E-6 D509 F-2 D607 E-5 D644 C-8 D801 I-11 D802 G-9 D803 G-11 D831 I-6 D832 I-7 D851 I-10 D852 G-9 D881 H-9 D901 I-4 D902 I-4 D903 I-4 D904 I-4 D905 I-1 D906 H-1 D907 I-5 D908 I-5 D909 I-5 D910 I-5 D915 I-4 D917 F-4 D919 H-3 D921 H-4 D922 G-4 D923 G-4 D924 F-2 IC101 C-10 IC301 B-3 IC381 A-12 IC501 D-5 IC502 D-7 IC801 H-10 IC901 G-6 IC902 G-4 IC903 H-4 IC904 H-3 Ref. No. Location Q111 D-10 Q112 D-10 Q113 E-9 Q1 C-9 Q2 C-9 Q3 E-9 Q191 D-12 Q192 E-10 Q201 D-9 Q251 C-9 Q331 C-1 Q332 C-2 Q333 C-2 Q334 C-2 Q335 D-1 Q336 F-1 Q337 F-1 Q338 F-1 Q339 F-1 Q340 E-1 Q341 E-1 Q342 F-1 Q343 E-1 Q401 F-12 Q402 E-12 Q411 G-1 Q412 G-1 Q431 G-12 Q432 G-11 Q433 F-11 Q434 F-11 Q435 F-11 Q436 F-11 Q437 G-12 Q439 F-12 Q471 F-2 Q501 D-7 Q508 D-7 Q509 E-7 Q801 H-10 Q803 G-10 Q804 G-9 Q831 G-10 Q832 G-10 Q851 I-10 Q881 I-9 Q901 H-2 Q902 I-1 Q903 H-1 Q904 G-4 Q905 G-4 Q909 I-4 Q911 G-3 Q912 G-4 Q913 H-1 Q914 G-2 Q923 H-1 Q951 G-2 Q952 H-1 (DECK A REC) (DECK B HALF) E (Page 38) (DECK B REC) (DECK B 120/70) (DECK A PLAY) (DECK B PLAY) Voltages are dc with respect to ground under no-signal conditions. no mark : TAPE PLAY ( ) : RECORD : Impossible to measure 34 34
7-15. SCHEMATIC DIAGRAM MAIN (1/4) BOARD Refer to page 35 for Printed Wiring Board. (Page 44) (Page 37) (Page 26) (Page 31) (Page 39) (Page 31) Voltages are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM) ( ) : CD PLAY 36 (Page 38) 36
7-. SCHEMATIC DIAGRAM MAIN (2/4) BOARD Refer to page 35 for Printed Wiring Board. D3001 11ES2 D3002 11ES2 (Page 36) (Page 43) (Page 38) The components identified by mark! or dotted line with mark! are critical for safety. Replace only with part number specified. Voltages are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM) (Page 39) 37 37
7-17. SCHEMATIC DIAGRAM MAIN (3/4) BOARD Refer to page 35 for Printed Wiring Board. (Page 36) (Page 37) (Page 39) (Page 43) CN371 15P (Page 41) (Page 33) (Page 39) (Page 34) 38 38 Voltages are dc with respect to ground under no-signal conditions. no mark : TUNER (FM/AM) ( ) : CD PLAY { } : PLAYBACK (DECK A) [ ] : PLAYBACK (DECK B) : RECORD
7-18. SCHEMATIC DIAGRAM MAIN (4/4) BOARD Refer to page 35 for Printed Wiring Board. Refer to page 49 for IC Pin Function Description. (Page 37) (Page 36) (Page 38) CD POWER D5V GND VDD L (Page 42) (Page 38) 39 39 Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM) ( ) : CD PLAY { } : PLAYBACK (DECK A) [ ] : PLAYBACK (DECK B) : RECORD
7-20. SCHEMATIC DIAGRAM PANEL BOARD Refer to page 48 for IC Block Diagrams. Refer to page 58 for IC Pin Function Description. (Page 42) (Page 38) Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM) 41 41
7-21. PRINTED WIRING BOARD CD SW/5V POWER BOARD Refer to page 23 for Circuit Boards Location. 7-22. SCHEMATIC DIAGRAM CD SW/5V POWER BOARD (Page 41) (Page 40) (Page 35) 4.7 7.3 5.0 (Page 39) 7.3 9.3 8.1 27 42 42
7-23. PRINTED WIRING BOARD TRANSFORMER BOARD Refer to page 23 for Circuit Boards Location. (Page 35) Semiconductor Location Ref. No. Location D971 A-2 D972 A-1 D973 A-1 Q971 A-1 (Page 35) 27 7-24. SCHEMATIC DIAGRAM TRANSFORMER BOARD (Page 37) (Page 38) Voltages are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM) The components identified by mark! or dotted line with mark! are critical for safety. Replace only with part number specified. 43 43
7-25. PRINTED WIRING BOARD SURROUND BOARD Refer to page 23 for Circuit Boards Location. 7-26. SCHEMATIC DIAGRAM SURROUND BOARD Refer to page 47 for IC Block Diagrams. (Page 36) Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM) (Page 35) 44 44
7-27. IC BLOCK DIAGRAMS BD Board IC101 CXD3008Q VPCO VM TL DVDD2 ASYE MD2 DOUT LRCK PCMD BCK EMPH XTSL DVSS2 XTAI XTAO DIGITAL OUT D/A DIGITAL INTERFACE 32K RAM OSC ERROR CORRECTOR EFM DEMODULATOR SE TE TES1 TEST1 DVSS1 FRDR SOUT SOCK XOLT SUBCODE PROCESSOR SERVO INTERFACE DVDD1 FSTO SSTP SERVO AUTO SEQUENCER DIGITAL CLV PROCESSOR MDP LOCK PWMI SQSO SQCK SCSY SBSO EXCK CPU INTERFACE MIRR, DFCT, FOK DETECTOR FOK DFCT DVDD0 XRST MUTE DATA XLAT CLOK SENS SCLK ATSK WFCK XUGF XPCK GFS C2PO SCOR C4M WDCK DVSS0 COUT MIRR BIAS AVDD1 PCO FILI FILO CLTV AVSS1 RFAC ASYI ASYO AVDD0 IGEN AVSS0 ADIO RFDC CE TE 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 61 62 63 64 65 66 67 68 69 70 71 72 CLOCK GENERATOR DIGITAL PLL ASYMMETRY CORRECTOR FOCUS SERVO DSP TRACKING SERVO DSP SLED SERVO DSP A/D CONVERTER OPERATIONAL AMPLIFIER & ANALOG SWITCH FOCUS PWM GENERATOR TRACKING PWM GENERATOR SLED PWM GENERATOR 40 39 38 37 36 35 34 33 FFDR 32 TRDR 31 TFDR 30 SRDR 29 SFDR 73 74 75 28 27 26 25 24 23 76 77 78 79 80 22 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 18 19 20 45
IC103 CXA2568M-T6 HOLD 1 VEE APC PD AMP C APC LD AMP C 24 23 22 C LC/PD LD ON AGC VTH 2 VEE 50µA 21 20 HOLD SW AGC CONT LD PD 3 4 C 19 RF BOT A 5 B C 6 7 VEE RF SUMMING AMP RF EQ AMP 18 17 RFTC RF I RF O D 8 15 RFE FOCUS ERROR AMP VEE 9 F 10 VEE 14 FE 13 TE E 11 TRACKING ERROR AMP 12 BUFFER VEE C MOTOR (TURN) BOARD MOTOR (SLIDE) BOARD IC701 M54641L IC801 BA6286N C OUT2 IN1 1 2 3 INPUT AMP. REG CONTROL POWER AMP. 8 C GND RIN VREF OUT2 RNF GND 1 2 3 4 5 6 TSD POWER SAVE CONTROL LOGIC GND 4 INPUT AMP. POWER AMP. 7 6 5 OUT1 IN2 REFERENCE OUT1 7 VM 8 C 9 FIN 10 46
VIDEO BOARD IC509 PCM1727E-2/T2 384fs XT1 1 CLOCK MANAGER DUAL PLL 24 XT2 PGND P NCKO RSV SCKO3 ML MC MC RSTB 2 3 4 5 6 7 8 9 10 MODE CONTROL POWER SUPPLY 8 TIME OVER SAMPLING DIGITAL FILTER FUNCTION CONTROL AUDIO DATA INPUT INTERFACE OPEN 23 DGND 22 VDD 21 SCKO1 20 SCKO2 19 LRCK 18 DATA 17 BCK ZERO 15 CAP 14 VOUTL BPZ CONTROL MULTI LEVEL Σ MODULATOR MULTI LEVEL Σ MODULATOR 5 LEVEL DAC 5 LEVEL DAC VOUTR 11 CR LPF OUTPUT AMP CR LPF OUTPUT AMP AGND 12 13 A SURROUND BOARD IC1201 LV1150 ADM OSC ADM-CONT S-RAM LDELAY LR LR LOW-PASS FILTER VIRTUAL VSS SW1 SW2 LPF1 LPF2 LS-CUT R-PS-IN C L-PS-IN RS-OUT L-IN R-IN LC-INE LC-INB VDD A/D NS D/A DC-CUT AGND VREF EF-VOL L-OUT R-OUT 24 23 22 21 20 19 18 17 15 14 13 RDELAY 1 2 3 4 5 6 7 8 9 10 11 12 47
AUDIO BOARD IC602 µpc1330ha INVERTER COMPARATER 1 2 3 4 5 6 7 8 9 SW R1 GND SW P1 CONT GND C SW P2 GND SW R2 PANEL BOARD IC603 BA3830F IC604 NJU37M-T2 R02 1 REFERENCE CURRENT RESET 18 RESET VDD P6 P5 P4 P3 P2 VSS P1 CLR STB CLK DATA 24 23 22 21 20 19 18 17 15 14 13 R01 LINE NF LINE IN 2 3 4 REFERENCE CURRENT BAND PASS FILTER DET 17 15 14 13 12 F01 F02 F03 F04 F05 F06 CONTROL CIRCUIT SHIFT REGISTER REC NF 5 LATCH CIRCUIT REC IN 6 11 10 REC LEVEL C OUTPUT CIRCUIT RESET C 7 BIAS C 8 GND 9 1 2 3 4 5 6 7 8 9 10 11 12 P7 P8 P9 P10 P11 VSS P12 P13 P14 P15 P SO IC711 M65850FP 14 13 12 11 10 9 8 OSCILLATOR D/A LPF2 1/2 C AUTO RESET CLOCK DO1 MO MAIN RESET CONTROL MI D1 DO0 20KBIT SRAM LPF1 A/D 1 2 3 4 5 6 7 LPF1IN LPF1OUT OP1OUT OP1IN CC1 CC2 GND C CLOCK REF OP2IN OP2OUT LPF2IN LPF2OUT 48