Onkyo DX-7555 Service Manual
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SERVICE MANUAL
SERVICE MANUAL
COMPACT DISC PLAYER
DX-7555
MODEL
Black, Silver and Golden models
BMPP
230-240V AC, 50Hz
SMPP
230-240V AC, 50Hz
GMGT
220-230V AC, 50/60Hz
GMGR
220-230V AC, 50/60Hz
GMDT
120V AC, 60Hz
BMDC
120V AC, 60Hz
SMDC
120V AC, 60Hz
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
Ref. No. 3911
ON THE
DX-7555
122005
/ 092006
ON
STANDBY
OPEN/CLOSE
1
2
3
SEARCH
4
5
6
MEMORY
7
8
9
ENTER
10
10/0
CLR
DIMMER
DISPLAY
ENTER
SETUP
RANDOM REPEAT
RC-625C

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Summary of Contents for Onkyo DX-7555

  • Page 1 COMPONENTS IDENTIFIED BY MARK ON THE SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE THESE COMPONENTS WITH ONKYO PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL. MAKE LEAKAGE-CURRENT OR RESISTANCE...
  • Page 2: Specifications

    DX-7555 SPECIFICATIONS Signal readout : Optical non-contact Frequency response : 2 Hz - 20 kHz SN ratio : 111 dB Audio dynamic range : 100 dB THD (total harmonic distortion) : 0.0027% Audio output Digital optical : -22.5 dBm Audio output / Impedance Digital coaxial : 0.5 Vp-p, 75 ohm...
  • Page 3: Service Procedure

    DX-7555 SERVICE PROCEDURE-1 PROTECTION OF EYES FROM LASER BEAM DURING SERVICING This set employs a laser. Therefore, be sure to follow Laser Diode Properties carefully the instructions below when servicing. Material: GaAS/GaAlAs Wavelength: 760-800nm WARNING!! Laser output: max. 0.5mW* Emission Duration: continuous SERVICE WARNING : DO NOT APPROACH THE *This output is the value measured at a distance about 1.8mm...
  • Page 4 DX-7555 SERVICE PROCEDURE-2 1. Initialize the unit. (1) Press and hold down the STOP [ ] button, then press the FF (fast forward) [ ] button. All segments light up. (2) Press and hold down the STOP [ ] button, then press the PUSH TO ENTER (JOG) button.
  • Page 5: Exploded Views Of Mechanism

    DX-7555 A141 EXPLODED VIEW A141 A026 A018 A901 x 3 pcs. E004 E006 A110 x 10 pcs. A109 P901 A124 A090 P1002 P7001 A024 Z008 A105 P1003 x 4 pcs. x 4 pcs. Refer to "EXPLODED VIEWS A012 With MECHANISM OF MECHANISM"...
  • Page 6 DX-7555 EXPLODED VIEWS OF MECHANISM-1 CD LOADER MECHA. Z001 : MGD-34 Parts No. 24800055C <Note> CD MECHA. = Loader mecha. : "MGD-34" + Drive unit : "KSM-213CLCM" Z003 Z006 Z005 (Silver) Z007 Z002 Drive unit : KSM-213CLCM Refer to Z003 "EXPLODED VIEWS OF MECHANISM-2"...
  • Page 7: Parts List

    DX-7555 EXPLODED VIEWS OF MECHANISM-2 CD DRIVE UNIT : KSM-213CLCM PARTS LIST REF. NO. PART NO. (SN) DESCRIPTION Q'TY X-2625-877-1 Motor chassis ass'y X2625-769-1 Motor gear ass'y 2626-908-01 Sled shaft 24810023 Gear (A) (S) 7621-255-15 P2 x 3, Screw 24840008...
  • Page 8: Schematic Diagrams

    DX-7555 U01 : MAIN CIRCUIT PC BOARD NAAR-8645 SCHEMATIC DIAGRAMS-1 Q9001 NOTE 78M05 VSW_CPU THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY. REPLACE ONLY WITH PART NUMBER SPECIFIED. VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE. (NO INPUT SIGNAL) ELECTROLYTIC CAPACITORS ARE IN uF/WV.
  • Page 9 DX-7555 P-OFF OP_+8V Q8001 C8004 Q8002 BR93L56F-WE2 RN2403 Q9006A Q8004 R8001 78M56 L8001 R8003 RI_OUT Back up circuit S-80145CLMC BLM21B222SPT D8004 D8008 R8011 Q9006B C8005 S-812C56AUA-C3E-T2 D8006 Q8003 BACK_UP_EV5V RN1407 104Z P-ON C8007 D8003 EV_GND UDZS5.6B P-OFF DAC_CLK EXILIN EXILIN...
  • Page 10 DX-7555 SCHEMATIC DIAGRAMS-2 U06 : DISPLAY CIRCUIT PC BOARD NADIS-8650 FL_ON/OFF NADIS-8650 KEY_0 KEY_1 2.7K 2.7K R8801 R8800 KEY_2 K2 20 K3 19 AVSS 18 TI 17 TRAYBRIGHT 16 INTP_0 15 TRAYLED_1 14 SO_3 13 I_P22 12 DSC_ Q8601 I_P23 11...
  • Page 11 DX-7555 2.7K R8800 SW-VP 2.7K R8709 R8708 2.7K R8706 R8705 R8707 R8704 SW-VP R8703 LED_8 R8702 DSC_IND_LED3 SUBREQ SUBREQ R8701 SUBREQ SUBSO SUBSO SUBSO SUBSI SUBSI R8605 SUBSI SUBCL SUBCL SUBCL R8603 SUBRSTIN SUBRSTIN SUBRSTIN R8601 X8601 12.50MHZ +B[SUB] VP_ACH...
  • Page 12 DX-7555 SCHEMATIC DIAGRAMS-3 U10 : SUPER PRECISION CLOCK PC BOARD NADG-8725 CLK3.3V VDDA+3.3V L001 VDD+3.3V VDD+3.0V R001 VDD+3.0V 16.9344M C006 R014 103K VCTRL VD+3.3V R011 R015 GNDD CLK2V CLK3.3V GNDD TC7WZU04FU VCONT_MPU R012 Q001 2.2KF E001 CLK2V...
  • Page 13 DX-7555 PRINTED CIRCUIT BOARD VIEWS-1 MAIN CIRCUIT PC BOARD (NAAR-8645) Component side CONNECTOR PC BOARD (NAETC-8736) Component side...
  • Page 14 DX-7555...
  • Page 15 DX-7555 PRINTED CIRCUIT BOARD VIEWS-2 MAIN CIRCUIT PC BOARD (NAAR-8645) Soldering side...
  • Page 16 DX-7555...
  • Page 17: Nadis

    DX-7555 PRINTED CIRCUIT BOARD VIEWS-3 (FROM SOLDERING SIDE) DISPLAY CIRCUIT PC BOARD (NADIS-8650) Component side C8501 J1003 C8507 C8501 P8001 J1001 STANDBY J1002 J1006 J1012 Q8503 J1005 S8001 J1029 C8502 J1011 J1014 OP/CL J1034 J1013 S8002 J1004 DISP S8103 S8102...
  • Page 18 DX-7555 SUPER PRECISION CLOCK PC BOARD (NADG-8725) No PC board view. Look over the actual PC board on hand. U8001A U8001A Q8101A Q8101B X8601 Q8101B U8001 Q8101A U8001 C8504 J1021 J1022 J1024 Q8101 J1017 J1023 J1020 Q8101 C8102 R8600 R8800...
  • Page 19: Naps

    DX-7555 PRINTED CIRCUIT BOARD VIEWS-4 (FROM SOLDERING SIDE) POWER SUPPLY CIRCUIT PC BOARD (NAPS-8646) NCPS-8646 E012 ADD_+B 25138646 P-OFF P-ON J9006 J9004 J9005 C9110 C9105 J9001 C9105 C9114 C9109 C9109 C9113 C9106 J9002 R9201 R9206 R9205 C9108 R9204 R9202 C9111...
  • Page 20 DX-7555 PRINTED CIRCUIT BOARD VIEWS-5 (FROM SOLDERING SIDE) STANDBY LED PC BOARD (NAETC-8651) NCETC-8651 Component side Soldering side HEADPHONE JACK PC BOARD (NAETC-8652) L4001 P4101 C4108 C4111 C4107 E4103 P4101 C4121 JL4001B E4101 J4007 NCETC-8652 25138652 J4008 E4102 Component side HEADPHONE AMP.
  • Page 21 DX-7555 IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-1 Q2002 : BA5947FP (4-ch BTL DRIVER) BLOCK DIAGRAM PIN26 6.5k Vref (ch3, 4) (ch1, 2) Vref 100k 100k PIN3 THERMAL SHUTDOWN TERMINAL DESCRIPTION No. PIN NAME DESCRIPTION No. PIN NAME DESCRIPTION OPIN- Operational amplifier negative input terminal...
  • Page 22 DX-7555 IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-2 Q2003 : CXD3014R (CD Digital Signal Processor with Built-in RF Amplifier and Digital Servo + Digital High & Bass Boost + CODEC) -1/4 BLOCK DIAGRAM XRST TEST1 TRST IREQ XTAO XLAT2 XTACN DATA2...
  • Page 23 DX-7555 IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-3 Q2003 : CXD3014R (CD Digital Signal Processor with Built-in RF Amplifier and Digital Servo + Digital High & Bass Boost + CODEC) -2/4 TERMINAL DESCRIPTION Pin No. Pin name Description LR clock output.
  • Page 24 DX-7555 IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-4 Q2003 : CXD3014R (CD Digital Signal Processor with Built-in RF Amplifier and Digital Servo + Digital High & Bass Boost + CODEC) -3/4 TERMINAL DESCRIPTION (Continued) Pin No. Pin name Description Tracking drive output.
  • Page 25 DX-7555 IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-5 Q2003 : CXD3014R (CD Digital Signal Processor with Built-in RF Amplifier and Digital Servo + Digital High & Bass Boost + CODEC) -4/4 TERMINAL DESCRIPTION (Continued) Pin No. Pin name Description Test mode set.
  • Page 26 DX-7555 IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-6 Q4001 : WM8740 (24-BIT DAC) -1/2 BLOCK DIAGRAM...
  • Page 27 DX-7555 IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-7 Q4001 : WM8740 (24-BIT DAC) -2/2 TERMINAL DESCRIPTION...
  • Page 28 DX-7555 FL TUBE VIEW Q8101 : HNV-13SS12T DVD - AUDIO SACD V CD VIDEO OFF RANDOM MEMORY D PRO LOGIC TITLE GROUP TRACK CHP PROGRAM TOTAL REMAIN PROGRESSIVE (1G-10G) GROUP REMAIN TITLE TOTAL PRO LOGIC TRACK SACD -AUDIO PROGRAM MEMORY...
  • Page 29: Adjustment Procedure

    DX-7555 ADJUSTMENT PROCEDURE ADJUSTMENT OF MASTER CLOCK FREQUENCY [When] 1. Exchange super precision clock PC board ass'y (NADG-8725). 2. Exchange IC X001 (Crystal), IC Q9005 (MPC29M33HF), and IC Q8005 (Main microprocessor). [Procedure] 1. Connect the frequency counter to the test point P703 on main circuit PC board (NAAR-8645).
  • Page 30 DX-7555 PACKING PROCEDURE A804 A806 A809 A805 80 cm A810 A807 A801 A808 A803 A802 x 2 pcs. A606 A606 A602 A606 (INNER) A600 <R> A606 (L & R) A800 Front side A604 (OUTER) Right side marking A606 A600 <L>...
  • Page 31 Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN Tel: 072-831-8023 Fax: 072-831-8124 ONKYO U.S.A. CORPORATION 18 Park Way, Upper Saddle River, N.J. 07458, U.S.A. Tel: 201-785-2600 Fax: 201-785-2650 http://www.us.onkyo.com/ ONKYO EUROPE ELECTRONICS GmbH Liegnitzerstrasse 6, 82194 Groebenzell, GERMANY Tel: +49-8142-4401-0 Fax: +49-8142-4401-555 http://www.eu.onkyo.com/...

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