Philips MC-77 Service Manual
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Philips MC-77 Service Manual

Cdr mini system
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CDR Mini System

Table of Contents

Technical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Measurement setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Warnings & Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Service Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Location of printed circuit boards . . . . . . . . . . . . . . . . . . . 2-2
Dismantling Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Service Testprogram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Blockdiagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Front Display Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Tuner Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Front Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
S
(P
)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
TANDBY
OWER
PART
K
C
(KEYB. 1) & L
EY
ONTROL
H
, J
(V
)
EADPHONE
OG
OLUME
©
Copyright 2002 Philips Consumer Electronics B.V. Eindhoven, The Netherlands
All rights reserved. No part of this publication may be reproduced, stored in a retrieval
system or transmitted, in any form or by any means, electronic, mechanical, photocopying,
or otherwise without the prior permission of Philips.
Published by HB 0218 Service Audio
. . . . . . . . . . . . . . . 8-2
IGHTWASH PARTS
CDC K
. . . . . . . . . . . . 8-3
AND
EY PARTS
Printed in The Netherlands
Subject to modification
Electronic Tape Function ETF8 . . . . . . . . . . . . . . . . . . . . 9
3 Disc Tray Changer Module . . . . . . . . . . . . . . . . . . . . . 10
Power Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Exploded view of set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Partslist of set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
MC-77
/21/21M/22/37
CLASS 1
LASER PRODUCT
©
3103 785 25160

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  • Page 1: Table Of Contents

    LASER PRODUCT © Copyright 2002 Philips Consumer Electronics B.V. Eindhoven, The Netherlands All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips.

  • Page 2: Technical Specification

    Technical Specification General: Amplifier: Mains voltage : 120 / 240V switchable Output power : 2 x 75W at 6Ω (2x70W FTC) (for /21) : 230V Headphone : 2,5V at 100kΩ (for /22) : 120V Frequency response : 20Hz - 20kHz (-3dB) Limit (for /37) Mains frequency : 50 ~ 60Hz...

  • Page 3: Measurement Setup

    Measurement Setup Tuner FM Bandpass LF Voltmeter 250Hz-15kHz e.g. PM2534 e.g. 7122 707 48001 RF Generator e.g. PM5326 S/N and distortion meter e.g. Sound Technology ST1700B Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz). Tuner AM (MW,LW) Bandpass LF Voltmeter...

  • Page 4: Warnings & Safety

    Warnings & Safety © ñ WARNING WAARSCHUWING All ICs and many other semiconductors are susceptible to Alle IC´s en vele andere halfgeleiders zijn gevoelig voor electrostatic discharges (ESD). Careless handling during electrostatische ontladingen (ESD). repair can reduce life drastically. Onzorgvuldig behandelen tijdens reparatie kan de levensduur When repairing, make sure that you are connected with the drastisch doen vermindern.

  • Page 5: Service Hints

    Service hints Handling chip components Service Tools TORX T10 screwdriver with shaftlength 150mm ........4822 395 50423 TORX screwdriver set SBC 163 ..............4822 295 50145 Audio signal disc SBC 429..............4822 397 30184 Playability test disc SBC444 ..............4822 397 30245 Test disc 5 (disc without errors) + Test disc 5A (disc with dropout errors, black spots and fingerprints) SBC 426/426A ..............4822 397 30096...

  • Page 6: Location Of Printed Circuit Boards

    Location of Printed Circuit Boards Attention: Lightwash, CDC-key board, standby board and headphone board are part of the Front Control Board. For details see chapter 8...

  • Page 7: Brief Operating Instructions

    Brief Operating Instruction The following excerpt of the Owners Manual serves as a very short introduction to the set. The complete Owners Manual can be downloaded in several languages from the Internet site of Philips Customer Care Center: www.p4c.philips.com OPEN•CLOSE CD 1...
  • Page 8 Brief Operating Instruction...
  • Page 9 Brief Operating Instruction...
  • Page 10 Technical Remarks...

  • Page 11: Dismantling Instructions

    DISMANTLING INSTRUCTIONS Dismantling of the Cassette Cover 2. Twist screw driver 3. Lift up and out 1. Place screw driver Figure 2 Cassette Cover (flat side) between the cover & cassette door Figure 1 Remove Cassette Cover Figure 4 Dismantling of the 3DTC Module and Tuner Board Detaching the Front Panel assembly from the Bottom/Rear assembly 1) Loosen 4 screws and remove the Cover Top (pos 255) by 1) Remove 2 screws B (see figure 4) from the bottom of the...
  • Page 12 Dismantling of the Front Panel assembly Dismantling of the Bottom assembly 1) Loosen 4 screws C in figure 7 to remove the ETF8 Module. 1) Loosen 1 screw H as shown in figure 9 to remove the 2) Insert a strong string into the slot between the Jog knob Combi board assembly.
  • Page 13 SERVICE POSITIONS & REPAIR HINTS Service position C 1) During repair it is possible to disconnect the ECO6 4) Use Service position C for repairs on the ETF8 Tape Tuner board, ETF8 Tape Module and/or 3DTC Module module. completely unless the fault is suspected to be in that Note: The flex cables are very fragile, care should be area.

  • Page 14: Service Testprogram

    SERVICE TEST PROGRAM To start service test program hold P & AUX depressed while plugging in the mains cord S refers to Service Mode. Display shows the ROM version * V refers to Version. "S-Vyy" yy refers to Software version number of µProcessor. (Main menu) (Counting up from 01 to 99) TUNER...
  • Page 15 SET BLOCK DIAGRAM DIGITAL AMP. 6Ω MC-77 - dd wk0210...

  • Page 16: Wiring Diagram

    WIRING DIAGRAM Front Control Board HRT 1010 HRT 1201 Lightwashlit DM 60 Key Control 1147 10P/220mm FCT 1300 Power Module Combi Board CDC Keys Volume Standby Keys 1142 11P/180mm/AD FCT 1011 FFT 1202 1136 7P/5P/180mm/AD 1143 1701 7P/120mm/AD FCT 1012 4P/180mm Power Module 1501...

  • Page 17: Front Display Board

    2G - 9G B5 B4 B3 B2 B10 B9 B8 B3 B2 B5 B4 B3 B2 j , p j , p j , p j , p j , p j , p j , p j , p Front Display Board stage .1 TABLE OF CONTENTS...
  • Page 18 1100 C1 2102 I11 2113 J9 2123 B13 2133 D15 2143 B17 2900 H5 3108 I13 3118 F10 3128 E11 3138 C11 3148 C10 3158 C8 3168 D7 3178 J9 3189 G13 3199 B13 3212 E16 3900 H4 3910 H11 6101 C12 7101 A14 9106 I13...
  • Page 19 Component Layout Chip Layout 2101 D2 2117 B1 2135 A1 2150 D2 3112 C4 3128 C3 3142 D2 3156 E3 3170 D4 3189 A2 3210 A1 3902 A4 4105 E2 4123 B4 7105 C4 2102 D2 2120 D2 2136 A1 2153 A3 3113 D4 3129 C3...
  • Page 20 3169 © 4822 051 30102 1kΩ 0,06W 4107 © 4822 051 30008 CHIP JUMPER 0603 ––––––––––––––––––––––––––––––––––––––––––––––––––––– 1108 3139 110 52680 FTD Display MC-77 3106 © 4822 051 30684 680kΩ 0,06W 3170 © 4822 051 30102 1kΩ 0,06W 4109 © 4822 051 30008 CHIP JUMPER 0603 3107 ©...

  • Page 21: Tuner Board

    7A-1 7A-1 BLOCK DIAGRAM TUNER BOARD ECO 6 Systems Vcc1 buffer ampl. Stab Stab Discriminator FM-RF FM-IF 1 FM-IF 2 (MPX) Vcc2 1101 Loop (1102) LF filter 10,7 MHz 10,7 MHz 10,7 MHz 1120 left left Stereo right right Det. Decoder Frontend Mixer...
  • Page 22 7A-2 7A-2 1101 A1 1102 B1 1103 F2 1120 E14 1130 A2 TUNER BOARD ECO6 1131 B2 / SYSTEMS NON CENELEC 1132 G13 2101 B3 VERSION PROGRAMMING COMPONENTS 2102 B1 1101 2103 C7 2105 2104 B3 AM-IF1 1130 2105 A2 100n 5111 450kHz...
  • Page 23 7A-3 7A-3 TUNER ADJUSTMENT TABLE 1101 A6 1120 A4 1132 A5 2128 C4 2138 C2 3142 D2 5110 B3 5114 A2 5123 D5 7112 C1 9104 B5 9107 D4 ( ECO6 FM/MW- and FM/MW/LW - versions with AM-frame aerial ) 1102 B6 1130 B5 2106 C5...
  • Page 24 7A-4 7A-4 Electrical Partslist ECO6 SYSTEMS NON CENELEC MISCELLANEOUS RESISTORS ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– 1101 2422 015 19376 SOCKET 2P CLICKFIT 3143 © 4822 051 20223 22kΩ 0,1W USA only RDS only 1102 4822 267 10283 SOCKET COAX, IEC 75Ω 3144 © 4822 051 10102 1kΩ...
  • Page 25 7B-1 7B-1 BLOCK DIAGRAM ECO6 Tuner Board SYSTEMS CENELEC version: TABLE OF CONTENTS Blockdiagram ..............7B-1 Schematic Diagram ............7B-2 Component Layout............7B-3 Adjustment table .............7B-3 Electrical Partslist ............7B-4...
  • Page 26 7B-2 7B-2 1101 A2 5121 E11 1102 B1 5122 H5 1103 E2 5123 G5 1110 B2 6105-1 E4 VERSION PROGRAMMING COMPONENTS 1120 E14 6105-2 G6 TUNER BOARD ECO6 1130 A2 6106 D4 / SYSTEMS-CENELEC 1131 C2 6107 G13 VERSION AM-IF1 1132 F13 6120 C13 6120...
  • Page 27 7B-3 7B-3 1101 B5 1110 B4 1131 C5 2107 B3 2133 C1 2162 A4 5102 C4 5110 A2 5114 A2 5121 B2 7104 C4 9101 A2 9104 B1 9107 B4 9110 A4 TUNER ADJUSTMENT TABLE ( ECO6 Cenelec FM/MW - and FM/MW/LW - versions with AM-frame aerial ) 1102 B5 1120 A4 1132 A4...
  • Page 28 7B-4 7B-4 Electrical Partslist ECO6 SYSTEMS CENELEC MISCELLANEOUS RESISTORS DIODES ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– 1101 2422 015 19376 SOCKET CLICKFIT 2P 3128 © 4822 117 11449 2,2kΩ 0,1W 6105 © 4822 130 83075 HN1V02H USA only LW only 1102 4822 267 10283 SOCKET COAX, IEC 75Ω...

  • Page 29: Front Control Board

    STANDBY (POWER) PART - CIRCUIT & LAYOUTS 1400 A1 2401 E3 2404 C3 3400 A3 3403 B4 6400 C4 1402 A3 2402 E3 2405 C4 3401 A3 3404 E4 7400 D1 1405 A2 2403 B3 2406 C4 3402 C3 3405 E4 7402 C4 STDBY 3400...
  • Page 30 KEY CONTROL (KEYB. 1) PART - CIRCUIT & LAYOUT DIAGRAMS LIGHTWASH PART - CIRCUIT & LAYOUT DIAGRAMS 1300 A1 1303 B6 1306 B8 1309 B9 1312 B11 1315 D6 3301 B5 3304 B7 3307 B8 3310 B10 3313 C5 3316 D3 3319 C3 6301 C4 6304 D4...
  • Page 31 HEADPHONE PART - CIRCUIT & LAYOUT DIAGRAMS JOG (VOLUME) PART - CIRCUIT & LAYOUT DIAGRAMS CDC KEY PART - CIRCUIT & LAYOUT DIAGRAMS 1500 A1 1502 B3 2500 A5 3501 A4 1700 B1 1701 A2 2700 B3 2701 B3 3700 A3 3701 A3 1501 B2 1503 B4...
  • Page 32 ELECTRICAL PARTS LIST - FRONT CONTROL BOARD MISCELLANEOUS 1300 2422 025 14541 Flex Socket 11pin Hort. 3313 4822 051 30151 150R 5% 0,062W 3314 4822 051 30221 220R 5% 0,062W 1301 4822 276 13775 Tact Switch 1302 4822 276 13775 Tact Switch 3315 4822 051 30271 270R 5% 0,062W...
  • Page 33 CONNECTORS ASSIGNMENTS: CONNECTOR 1701 INTERCONNECTION TO AF BOARD REC-L Record input left REC-R Record input right GND A AF Ground TAPE-L Playback output left +12V D.C. supply (+12V) for AF electronics TAPE-R Playback output right -CMOS Negative d.c. supply (-9V) for controlling JFET J111 CONNECTOR 1703 INTERCONNECTION TO AF BOARD GND M...
  • Page 34 TAPE DECK WIRING TAPE MECHANISM ELECTRONICS To ETF8 Board Connector 1760 (8P) 08FESTVKNA Motor Pin No. 1. Vcc 12V 2. Photo Out 3. Gnd Photo Interrupter 4. Mode Switch Mode Switch 5. Solenoid 6. CrO2 Switch CrO2 Switch 7. Rec Switch (FWD) Rec Switch (FWD) 8.
  • Page 35 TAPE ADJUSTMENT & CHECK TABLE HEF4094BT FUNCTIONAL BLOCK DIAGRAM ADJUST TEST RECORDER MEASURE READ ON CASSETTE MODE with SBC420 frequency MOTOR SPEED PLAY check 3150Hz +/- 2% counter 3150Hz 8-STAGE SHIFT ’ SBC420 WOW & FLUTTER check PLAY W&F-meter < 0.4 % DIN REGISTER 3150Hz PLAY FWD...
  • Page 36 COMPONENT LAYOUT CHIP LAYOUT This assembly drawing shows a summary of all possible versions. For components used in a specific version see schematic and respecive parts list. This assembly drawing shows a summary of all possible versions. For components used in a specific version see schematic and respecive parts list. 3139 113 3455 pt 2 ...90140 dd wk204 3139 113 3455 pt 2 ...90140 dd wk204...
  • Page 37 CIRCUIT DIAGRAM 1701 D14 2621 A3 2702 E3 2711 D9 2716 H8 2721 D7 2727 D3 2732 G2 2769 E12 2784 I1 2789 E8 2795 G5 3607 A11 3612 B11 3630 A9 3710 I8 3719 E4 3724 E3 3737 G13 3744 F11 3762 H2 3771 I3...
  • Page 38 AUTOREVERSE (AR) TAPE MECHANISM MECHANICAL PARTS LIST - AUTOREVERSE TAPE MECHANISM 9965 000 10041 Rec/Pb Head assembly 9965 000 10042 Cap Pinch R 9965 000 10043 Cap Pinch L 9965 000 10044 Roller Pinch 9965 000 10045 Solenoid assembly 9965 000 10046 Motor Assembly 9965 000 07441 Belt-SR...
  • Page 39 NON-AUTOREVERSE (NAR) TAPE MECHANISM MECHANICAL PARTS LIST - NON-AUTOREVERSE TAPE MECHANISM 9965 000 12110 Play Head 9965 000 02600 Erase Head 9965 000 10042 Cap Pinch Roller 9965 000 10044 Roller Pinch 9965 000 07439 Solenoid Assy 9965 000 10046 Assembly Motor 9965 000 12114 Belt SF...
  • Page 40 TAPE MODULE EXPLODED VIEW ELECTRICAL PARTS LIST - ETF8 BOARD MISCELLANEOUS 1701 4822 267 10953 Flex Socket 7pin Vert. 2793 4822 126 13883 220pF 5% 50V 2794 4822 126 13883 220pF 5% 50V 1706 4822 267 10953 Flex Socket 7pin Vert. 1710 4822 267 10958 Flex Socket 5pin Hort.
  • Page 41 ELECTRICAL PARTS LIST - ETF8 BOARD RESISTORS 5703 4822 156 20946 Osc Coil 100kHz 3771 4822 117 11817 1k2 1% 1/16W 3772 4822 051 30153 15k 5% 0,062W DIODES 3772 4822 051 30123 12k 5% 0,062W Non-AR 6612 4822 130 31878 1N4003G 3774 4822 051 30183...
  • Page 42 9-10 Technical Remarks...
  • Page 43 10-1 3DTC Module (Basic version) Layout stage .5 TABLE OF CONTENTS Service hints ................10-2 Wiring..................10-3 Location of switches..............10-4 Blockdiagram ................10-5 Component Layout Main Board ..........10-6 Circuit Diagram part1 ..............10-7 Component Layout Main Board ..........10-8 Circuit Diagram part2 ..............10-9 Circuit Diagram part3 ..............10-10 Exploded View ................10-11 Mechanical Partslist ..............10-11 Electrical Partslist..............10-12...
  • Page 44 10-2 WARNING CHARGED CAPACITORS ON THE SERVO BOARD MAY DAMAGE THE CD DRIVE ELECTRONICS WHEN CONNECTING A NEW CDM MECHANISM. THAT´S WHY, BESIDES THE SAFETY MEASURES LIKE • SWITCH OFF POWER SUPPLY • ESD PROTECTION ADDITIONAL ACTIONS MUST BE TAKEN BY THE REPAIR TECHNICIAN. The following steps have to be done when replacing the CD mechanism: 1.
  • Page 45 10-3 WIRING Module WIRING CD Drive...
  • Page 46 10-4 Location of switches SW4&5 SW2&3 Truth Table Register output / Switch Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Function Slider reverse recognition Slider forward recognition Drawer closed recognition No carriage under clamper Carriage #1 under clamper Carriage #2 under clamper Carriage #3 under clamper Carriage home recognition Carriage extra recognition...
  • Page 47 10-5 10-5 BLOCK DIAGRAM 3DTC CD MECHANISM MAINBOARD VAM2201 DISC 7802 7800 TDA7073A TURNTABLE FOC + MOTOR FOCUS MOTOR FOC - RAD + RADIAL MOTOR RAD - 7816 1803 7803 TDA7073A SLEDGE + SIGNAL PROCESSOR CD LEFT SLEDGE CD10 MOTOR SLEDGE - SAA7324 (SAA7325) Active low pass...
  • Page 48 10-6 10-6 2700 B3 2816 F4 2846 C2 2878 B5 3701 F2 3727 D6 3745 C5 3761 F5 3778 B3 3795 F2 3818 F4 3848 C6 3864 E3 3880 D3 6804 A2 7811 B7 2703 B3 2817 E5 2848 C3 2879 A4 3702 E6 3728 D5...
  • Page 49 10-7 10-7 1800 2813 2822 2834 2848 2859 2864 3810 3821 3835 3856 3869 3876 3884 3890 7801 1801 2814 2828 2836 2851 2860 2865 3813 3829 3836 3859 3870 3877 3885 3891 7802 2810 2815 2829 2839 2852 2861 3807 3817 3830...
  • Page 50 10-8 10-8 2700 B3 2816 F4 2846 C2 2878 B5 3701 F2 3727 D6 3745 C5 3761 F5 3778 B3 3795 F2 3818 F4 3848 C6 3864 E3 3880 D3 6804 A2 7811 B7 2703 B3 2817 E5 2848 C3 2879 A4 3702 E6 3728 D5...
  • Page 51 10-9 10-9 1802 2819 2842 2850 2866 2885 2889 2893 3703 3735 3756 3760 3764 3841 3853 3860 3867 3883 7816-A D11 1803 2820 2845 2853 2867 2886 2890 2894 3719 3743 3757 3761 3765 3844 3854 3863 3874 6801 7816-B C10 2817 2831...
  • Page 52 10-10 10-10 Technical remarks 1804 2703 3771 3775 3779 3783 3788 6804 6808 7813 –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 1805 2704 3772 3776 3780 3784 3789 6805 6809 7814 2700 2706 3773 3777 3781 3786 3790 6806 6810 7815 2701 2712 3774 3778 3782 3787 3791 6807...
  • Page 53 10-11 10-11 3Disc Tray Changer Exploded view MECHANICAL PARTS ––––––––––––––––––––––––––––––––––––––––––––––––––––– 9965 000 06538 ASSY HOLDER LEFT 9965 000 06539 ASSY HOLDER RIGHT 9965 000 06540 ASSY CARRIAGE 1 (TOP) 9965 000 06541 ASSY GEAR STAR 9965 000 06542 ASSY MOTOR CARRIAGE 9965 000 06543 ASSY MOTOR DRAWER 9965 000 06544...
  • Page 54 10-12 10-12 ELECTRICAL PARTSLIST 3DTC MODULE Basic Version ELECTRICAL PARTSLIST 3DTC MODULE Basic Version –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– MISCELLANEOUS CAPACITORS RESISTORS TRANSISTORS ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– 1800 4822 265 10925 FLEX FOIL CONNECTOR, 15PIN 2891 4822 124 42383 220µF 3833 © 4822 051 30103 10kΩ...
  • Page 55 11-1 Power 2002 Module (70W Class D) stage M.4/C.7 TABLE OF CONTENTS Brief Circuit Description ..............11-2 Service Hints ..................11-4 OMBI OARD Circuit Diagram Overview ..................11-7 Source Selector part ..............11-8 Audio Frequency & Logic part.............11-9 Oscillator & Pre-Amplifier part...........11-10 Amplifier part Left Channel ............11-11 Amplifier part Right Channel .............11-12 Component Layout Copperside view ...............11-13...
  • Page 56 11-2 Class-D Circuit Description ( 2002 M - 70W C ASED ON OWER ODULE LASS Basically Class-D works by transforming the LF audio input Required Circuitries: to a square wave signal with a fixed frequency and a variable duty cycle. See simplified drawing below. •...
  • Page 57 11-3 Class-D Circuit Description ( 2002 M - 70W C ASED ON OWER ODULE LASS Functional Description: Protection Circuits: Refers to the left channel in schematic diagrams. The amplifier is protected against low load impedance The first stage of the modulator is an error integrator which (including short circuit).

  • Page 58: Service Hints

    11-4 Service Hints The analog part of the Combi Board can be repaired without Measuringpoint : Output pre-amplifier opening the metal shielding box. In case of a ‘Class D’ problem it is advised to disassemble the board first, desolder the metal bottom of the shielding box and assemble the board again.
  • Page 59 11-5 Service Hints Measuringpoint Measuringpoint : Output modulator The first stage of the modulator is an integrator. An In this pulse width modulated square wave the analog Audio integrated rectangle results in a triangle. signal is included. Measurements with an analog scope will show a jitter on the falling edge.
  • Page 60 11-6 Service Hints Measuringpoint : gate-signal of the FETs Measuringpoint Measuringpoint Digital output signal. Measuringpoint The following three signals are measured after output filter 5101 with different timebases. After common mode coil 5102 - the audio signal is restored.
  • Page 61 11-7 11-7 Power 2002 70W Class D Combi Board Circuit Diagram Overview OURCE ELECTOR SCILLATOR & MPLIFIER MPLIFIER ART LEFT CHANNEL Inputs: Generation of following supplies: Modulator +12V Tape +5V6 Driver + Level shifter Tuner +5V_AMP +5V6_AMP Power FETs Source Selector IC + sound processing Pre-Amplifier + mute circuit Protection circuits Chapter 11-11...
  • Page 62 11-8 11-8 1005 1022 2528 2537 2548 2556 2564 2572 2582 3518 3526 3534 3549 3557 3566 3574 6500 6508 7505 1006 1026 2529 2538 2549 2557 2565 2573 3500 3519 3527 3535 3550 3558 3567 3575 6501 6510 7506 1010 1311 2531...
  • Page 63 11-9 11-9 1004 E1 2400 B3 2404 C3 2408 D1 2412 E4 2416 D8 2420 H5 3402 C5 3406 C4 3410 D5 3415 E3 3421 F3 3425 G4 3429 G5 3433 G4 3437 H8 6400 D8 7400-B C3 7405 F4 7409 G9 9268 G8 1014 G1...
  • Page 64 11-10 11-10 2224 G11 3580 F4 2300 A7 4301 A5 2301 A9 5104 A2 2303 B6 5300 A8 & P UPPLY, SCILLATOR MPLIFIER 2304 D3 5301 B2 2305 B5 5302 D8 5104 7310 2306 A2 6300 E4 +5V_AMP 2334 +5V6 OSCILLATOR +5V_AMP Bead 100MHz...
  • Page 65 11-11 11-11 2100 A10 2106 B11 2112 D10 2118 F10 2125 E1 2134 E13 3101 B10 3108 A2 3114 B5 3120 C3 3126 A1 3133 D7 3140 E3 3146 F5 5101 D12 6106 D8 7104 B11 7105-E B7 7112 C12 7118-A F5 7118-F F8 7122-C E3...
  • Page 66 11-12 11-12 1201 F14 2203 B9 2211 D3 2217 D10 2225 G9 2237 F3 3210 A5 3218 B3 3226 D12 3238 E13 3247 E9 3255 F5 3263 G13 6202 B13 6211 D9 7203 B13 7209-E B6 7221 C9 7232-A F2 7235-A G5 7238 C2 1307-A E14...
  • Page 67 11-13 11-13 2100 G1 3146 F3 3555 A1 2101 G1 3147 F2 3556 B1 Combi Board copperside view 2103 G2 3148 E2 3557 C8 2104 D6 3149 E2 3558 A1 2106 F2 3201 H9 3559 A1 3203 H9 3560 B7 2108 E3 2110 F1 3205 G5...
  • Page 68 11-14 11-14 1002 A3 9229 D6 1004 D1 9230 D7 1005 C1 9231 C5 1006 B1 9232 C6 Combi Board componentside view 1010 G4 9233 D3 1011 A8 9234 C7 1012 A9 9235 D6 1013 A7 9236 C10 1014 D11 9237 D6 1018 A4 9238 B4...
  • Page 69 11-15 11-15 0201 A4 1201 C1 1203 B3 1205 D1 1206 D1 1207 B5 Mains Board copperside view 1208 D5 1209 C5 1210 C5 1212 C4 1222 B1 1223 B1 2200 A4 2201 D5 2203 A4 2204 B4 2205 C5 2207 C5 2208 C5 2209 A5...
  • Page 70 2220 2224 680R BD438 -AMP -38V BC557B -AMP -AMP -38V 7204 22.9V PLAY MODE 6225 5203 ECO STANDBY MODE 1N4003 10.9V MAINS_2 6226 measured with a " not grounded multimeter " 1N4003 MC-77 Mains Board Circuit Diagram 2002 04 10...
  • Page 71 11-17 ELECTRICAL PARTSLIST POWER 2002 70W Class-D Combi Board –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– MISCELLANEOUS CAPACITORS ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– 1004 4822 267 31729 CINCH SOCKET, 1 POLE 2224 4822 124 11947 10µF 1005 4822 265 20553 CINCH SOCKET, 2 POLE 2225 2020 012 93762 330µF 1006 4822 267 31729 CINCH SOCKET, 1 POLE...
  • Page 72 11-18 ELECTRICAL PARTSLIST POWER 2002 70W Class-D Combi Board –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– CAPACITORS RESISTORS ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– 2520 © 4822 126 13881 470pF 3116 © 4822 051 30474 470kΩ 0,06W 2526 4822 124 21913 1µF 3117 © 4822 051 30222 2,2kΩ 0,06W 2527 © 2238 586 59812 100nF 3119 ©...
  • Page 73 11-19 ELECTRICAL PARTSLIST POWER 2002 70W Class-D Combi Board –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– RESISTORS RESISTORS ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– 3259 © 4822 051 30472 4,7kΩ 0,06W 3426 © 2120 108 91909 39Ω 3261 © 4822 051 30471 470Ω 0,06W 3427 © 4822 051 30103 10kΩ 0,06W 3262 ©...
  • Page 74 11-20 ELECTRICAL PARTSLIST POWER 2002 70W Class-D Combi Board –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– RESISTORS DIODES ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– 3569 © 4822 051 30102 1kΩ 0,06W 6104 © 4822 130 11397 BAS316 3570 © 4822 117 13632 100kΩ 0,06W 6106 © 4822 130 11416 PDZ6.8B 3571 ©...
  • Page 75 11-21 ELECTRICAL PARTSLIST POWER 2002 70W Class-D Combi Board –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– TRANSISTORS ––––––––––––––––––––––––––––––––––––––––––––––––––––– 7243 © 4822 130 42615 BC817-40 7309 © 9340 217 70115 BC847BW 7310 © 4822 130 42804 BC817-25 7316 © 9340 218 50115 BC857BW 7317 © 9340 217 70115 BC847BW 7319 ©...
  • Page 76 11-22 ELECTRICAL PARTSLIST POWER 2002 70W Class-D Mains Board –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– MISCELLANEOUS COILS ––––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––––––––––––––––––––––––––––––––––––––––– ! 4822 071 51602 1201 FUSE 1,6A 5202 4822 157 53473 1000µH 1201 ! 4822 253 10126 FUSE T4A 5203 4822 157 53473 1000µH 1203 ! 4822 071 55002 5220 ! 4822 157 11832 FUSE T5A 400µH Mains filter...
  • Page 77 12-1 12-1 EXPLODED VIEW - MC-77 3x10 TAP 188 (2x) 3x10 TAP 282 (3x) 3x10 TAP Power Module Mains Socket (for details see chapter 11) 3x10 TAP Power Module 3x10 TAP Mains Board 3x10 TAP (for details see chapter 11)
  • Page 78 3139 113 27140 FOOT RUBBER 4MM 3103 308 12460 BUTTON-SET CONTROL-RIGHT 3139 114 71560 BRACKET CONTROL/COMBI 3103 308 12490 BUTTON-SET TREBLE/BASS spare part 3139 118 14950 KNOB JOG CHROME 3103 308 12400 CONTROL-PANEL non spare part Exploded view MC-77 Front (2002-02-26)
  • Page 79 12-3 MISCELLANEOUS ––––––––––––––––––––––––––––––––––––––––––––––––––––– 3103 308 12140 SPEAKER-BOX-ASSY not for /37 3103 308 12790 SPEAKER-BOX-ASSY for /37 only 4822 303 50063 FM AERIAL 4822 320 11094 FW ANTENNA WIRE /37 3103 308 54550 REMOTE CONTROL not for /37 3103 308 54560 REMOTE CONTROL for /37 only 2422 549 45067 AM Loop Antenna...

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