Philips MC-21 Service Manual Download Page 26 | Manualshive

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5-1

5-1

SET WIRING DIAGRAM

FFT 1251

1134

FCT 1400

FCT xxxx

DM - DIPMATE

FCT - FFC TOP ENTRY

EHS 1805

1

FCT 1120

1

1137

1137

4P/180mm

1701

DM XXXX

19P/100mm/AD

2P/180mm/220mm

9P/11P/120mm

6P/140/180mm

7P/220mm

7P/180mm/AD

1133

xxxx

1144

1147

1136

1

DM XXXX

EHT 1222

19P/180mm/AD

DM XXXX

1

1

DM XXXX

FCT 1403

FCT 1264

1

FCT 1265

1139

xxxx

1135

1146

BD 1700

DM 60

DM 1500

xxxx

1138

11P/180mm/AD

1142

7P/120mm/AD

1143

2P/100mm

1501

2P/140mm

1601

FCT 1105

1141

FCT 1701

1

FCT 1100

1

1

DM XXXX

FCS - FFC SIDE ENTRY

EHT - EH TOP ENTRY

EHS - EH SIDE ENTRY

LEGEND

1

FCT 1221

FCT 1400

FCT XXXX

1

1

1

DM 1255

FCT 1266

1

EHS 1801

1

1

DM XXXX

1

1

EHS 1260

1

1

FCT 1706

1

1

1

1

DM XXXX

1

FCS 1803

1

FFT 1120

1

FFT 1202

1

FCT 1101

EHT 1901

EHT 1900

eht 1102

4P/120mm/AD

DM XXXX

1

1

FCT 1262

1

1

DM XXXX

1

7P/5P/180mm/AD

EHT 1220

1

EHT 1201

1104

1131

FCT 1107

1

FCT 1253

FCT 1256

4P/120mm/AD

FCT 1300

1104

9P/100mm/AD

8P/280mm/AD/Fold

7P/220mm/AD/Fold

FCS 1800

FCT 1106

1

FCT 1263

1

1

DM XXXX

1

DM 23

FCT 1222

FCT 1224

FCT 1221

EHT 1402

EHT 1402

FAN

1

EHT 1703

EHT 1252

1

FCT 1250

MC-50 - 3139 119 33710 sh 132-1 dd wk105

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Summary of Contents for MC-21

Page 1: ...iring diagram 5 Front Display Board 6 ECO6 Tuner Board System Non Cenelec 7A System Cenelec 7B Front Control Board 8 ETF6 LE Tape Module 9 3TDC Module 10 Power 2001 Module 11 Set Mechanical Exploded view parts list 12 Copyright 2001 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 transmitte...

Page 2: ...ndby with Clock Display x x x x x ECO Power LPS or Low Power Standby x ECO6 Tuner board System Non Cenelec x x x x ECO6 Tuner board System Cenelec x VERSION VARIATIONS Type Versions MC 70 Features Board in used MAINS BOARD S O C K E T B O A R D R E G U L A T O R S T A B I L I Z E R B O A R D T U N E R B O A R D ETF BOARD D I S P L A Y B O A R D COMBI BOARD STANDBY POWER BOARD CDC KEY BOARD KEY CON...

Page 3: ... 0mV M Selectivity at 18kHz bandwidth 24dB IF rejection 45dB Image rejection 30dB Distortion at RF 50mV m 80 5 AMPLIFIER Output power 2 x 50W RMS 1 22 2 x 40W FTC 2 37 Frequency response within 3dB 50Hz 16kHz Treble control 12 5kHz 3 steps 3 Bass control 55Hz 3 steps 3 Incredible Sound ON OFF 3 wOOx Level control 3 2 1 OFF 3 Headphone output at 32Ω 680mV 1dB Sub woofer output 1 5V 3dB at 22kΩ Digi...

Page 4: ...z e g 7122 707 48001 LF Voltmeter e g PM2534 DUT S N and distortion meter e g Sound Technology ST1700B Frame aerial e g 7122 707 89001 Tuner AM MW LW To avoid atmospheric interference all AM measurements have to be carried out in a Faraday s cage Use a bandpass filter or at least a high pass filter with 250Hz to eliminate hum 50Hz 100Hz RF Generator e g PM5326 Ri 50Ω Bandpass 250Hz 15kHz e g 7122 ...

Page 5: ...Hz 4822 397 30155 SBC429 Audio Signals disc 4822 397 30184 Dolby Pro logic Test Disc 4822 395 10216 ESD Equipment Anti static table mat large 1200x650x1 25mm 4822 466 10953 Anti static table mat small 600x650x1 25mm 4822 466 10958 Anti static wristband 4822 395 10223 Connector box 1MΩ 4822 320 11307 Extension cable to connect wristband to conn box 4822 320 11305 Connecting cable to connect table m...

Page 6: ...n osservazione della più grande cauzione alla loro manipolazione Durante le riparazioni occorre quindi essere collegato allo stesso potenziale che quello della massa dell apparecchio tramite un braccialetto a resistenza Assicurarsi che i componenti e anche gli utensili con quali si lavora siano anche a questo potenziale Pour votre sécurité ces documents doivent être utilisés par des spécia listes ...

Page 7: ...tching the system to Standby mode 13 Switching the system to Eco Power Standby mode 13 Power Saving Automatic Standby 13 Dim mode 14 Volume Control 14 Interactive Sound Control 14 15 CD Operation Discs for Playback 16 Loading Disc 16 Disc Playback 17 Programming the disc tracks 17 18 Repeat 18 Shuffle 18 Radio Reception Storing Preset Radio Stations 19 20 Tuning to Preset Radio Stations 20 Erasing...

Page 8: ...ct sunlight If the system is brought directly from a cold to a warm location or is placed in a very damp room moisture may condense on the lens of the disc unit inside the system Should this occur the CD player would not operate normally Leave the power on for about one hour with no disc in the system until normal playback is possible The mechanical parts of the set contain self lubricating bearin...

Page 9: ...em on or to Standby mode 2 ECO POWER to switch the system on or to Eco Power Standby mode 3 iR infrared sensor for remote control 4 OPEN to open the tape deck door 5 PHONES to connect headphones 6 PROG PROGRAM for CD to programme disc tracks for TUNER to programme preset radio stations for CLOCK to select 12 or 24 hour clock mode 7 BASS TREBLE to select BASS or TREBLE sound feature BASS TREBLE on ...

Page 10: ...tions on FM MW and LW band respectively Weak RDS stations may be stored in later presets All available RDS and radio stations with sufficient signal strength will be stored automatically The system will stop searching when all the available radio stations are stored or when the memory for 40 preset radio stations is used The last preset radio station or the first available RDS station will play wh...

Page 11: ...do not press any buttons within 30 minutes after a disc or tape has stopped playing Basic Functions 14 English Dim mode You can select the desired brightness for the display Press DIM on the remote control repeatedly to select DIM 1 DIM 2 DIM 3 or DIM OFF display mode DIM and the corresponding mode number will appear on the display except for DIM OFF mode DIM OFF All available LEDs light up displa...

Page 12: ... OFF will be displayed 16 English CD Operation IMPORTANT This system is designed for regular discs Therefore do not use any accessories such as disc stabiliser rings or disc treatment sheets etc as offered on the market because they may jam the changer mechanism Do not load more than one disc into each tray Discs for Playback This system can playback all digital audio CD finalised digital audio CD...

Page 13: ... 3 buttons on the remote control the system will playback the selected disc or track and the stored programme will be ignored temporarily The PROGRAM symbol also will disappear temporarily from the display It will reappear when playback of the selected disc ends 18 English During programming if no key is pressed within 20 seconds the system will exit the Programme mode automatically To review the ...

Page 14: ...et radio stations PROGRAM FULL will be displayed During programming if no key is pressed within 20 seconds the system will exit the Programme mode automatically Tuning to Preset Radio Stations Once you ve preset the radio stations press í or ë to select the desired preset number The preset number radio frequency and waveband will appear on the display Erasing a Preset Radio Station 1 Press í or ë ...

Page 15: ...ogress To cancel NEWS function Press NEWS again or press TUNER to select tuner mode During news bulletin press any other available source keys to execute the relevant source mode 22 English Tape Operation Recording IMPORTANT Before playing a tape check and tighten slack tape with a pencil Slack tape may get jammed or may burst in the mechanism C 120 tape is extremely thin and is easily deformed or...

Page 16: ...ouch Recording 1 Press 3CDC TUNER or AUX to select the source 2 Start playback of the selected source 3 Press 0 REC to start recording To stop recording Press Çon the system Note One Touch Recording is not possible in TAPE mode SELECT SOURCE will be displayed Tape Operation Recording 24 English Tape Operation Recording CD Synchro Recording 1 Press 3CDC to select the disc Press í or ë to select the...

Page 17: ... other available sources are flashing 2 Press 3CDC TUNER or TAPE to select the desired source Before setting timer make sure the music source has been prepared 3CDC Load the disc s To start from a specific track make a programme refer to CD Operation Programming the disc tracks TUNER tune to the desired radio station TAPE load a prerecorded tape 3 Press à or á on the system repeatedly to set the h...

Page 18: ...ntenance DISC NOT FINALIZED DISC NOT FINALIZED DISC NOT FINALIZED DISC NOT FINALIZED DISC NOT FINALIZED is displayed Use a finalised CD R W or CD R 29 English Troubleshooting RADIO RECEPTION Radio reception is poor If the signal is too weak adjust the antenna or connect an external antenna for better reception Increase the distance between the Mini HiFi System and your TV or VCR TAPE OPERATION REC...

Page 19: ...l to start playback again from where you have stopped Notes Resume will not be available if you have changed the disc opened the disc tray or disconnected the system the power supply Select CD RESUME in any other source mode will only able to resume the last selected CD active mode for example CD stop or playback Clock Timer To activate deactivate the TIMER Press TIMER ON OFF repeatedly on the rem...

Page 20: ...D O N O T P R I N T B L A N K P A G E ...

Page 21: ... remove the 3DTC Module 2 screws on the front 1 screw each on the left right side 6 Loosen 3 screws E see figure 8 on the Panel Rear pos 256 uncatch 2 catches C3 to remove the Tuner Board Figure 3 1 Remove 2 screws B see figure 4 from the bottom of the Cabinet Front pos 101 2 Release the fixation of the Combi Board to Bracket Combi pos 252 by releasing 2 catches C2 and pulling the board outwards a...

Page 22: ...ches C4 to free the Mains socket board from the Panel Rear pos 256 3 Loosen 6 screws G and 2 catches C5 to remove the Panel Rear pos 256 by sliding it out towards the rear Dismantling of the Bottom assembly 1 Loosen 2 screws H as shown in figure 9 to remove the Combi Regulator boards assembly 2 Loosen1 screws J and uncatch Shield Transformer pos 269 from the Bottom plate pos 265 as shown in figure...

Page 23: ...of the set 2 For Service position C repair on the ETF6 Tape module it is necessary to inter change the flex wires for connec tor 1701 1706 because of wire length Note The flex cables are very fragile care should be taken not to damage them during repair After repair be very sure that the flex cables are inserted properly intotheflexsocketsbeforeencasing otherwisefaults may occurs Service pos C Ser...

Page 24: ...on see note 1 Figure 2 note 1 3CDC TAPE and wOOx Figure 1 Table 2 Error code E1000 E1001 E1002 E1003 E1005 E1006 E1007 E1008 E1020 E1031 E1061 E1071 E1079 Error Description Focus Error Triggered when the focus could not be found within a certain time when starting up the CD or when the focus is lost for a certain time during play Radial Error Triggered when the radial servo is off track for a cert...

Page 25: ...4 1 4 1 SET BLOCK DIAGRAM MC 50 3139 119 33710 sh 130 1 dd wk105 ...

Page 26: ... 1141 FCT 1701 1 FCT 1100 1 1 DM XXXX FCS FFC SIDE ENTRY EHT EH TOP ENTRY EHS EH SIDE ENTRY LEGEND 1 FCT 1221 FCT 1400 FCT XXXX 1 1 1 DM 1255 FCT 1266 1 EHS 1801 1 1 DM XXXX 1 1 EHS 1260 1 1 FCT 1706 1 1 1 1 DM XXXX 1 FCS 1803 1 FFT 1120 1 FFT 1202 1 FCT 1101 EHT 1901 EHT 1900 eht 1102 4P 120mm AD DM XXXX 1 1 FCT 1262 1 1 DM XXXX 1 7P 5P 180mm AD EHT 1220 1 EHT 1201 1104 1131 FCT 1107 1 FCT 1253 F...

Page 27: ... r n d 4G a h j p k b f m g c e r n d 2G a h j p k b f m g c e r n d P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P16 13G B1 B2 B3 B4 B5 B6 B7 B8 B6 B3 B2 B5 B10 B9 B8 B4 B1 B7 12G B11 13G B8 B6 B3 B2 B5 B4 B1 B7 11G B8 B6 B3 B2 B5 B4 B1 B7 S1 1G S2 S3 S4 Col Dp a n g m k p h e f c b r j d 2G 9G 4 4 F 2 PIN NO CONNECTION 3 1 P 9 3 2 P 10 3 3 P 11 3 4 P 12 3 5 P 13 3 6 P 14 3 7 P 15 3 8 P 16 ...

Page 28: ...4 H15 7105 J8 7106 B5 7107 B6 7900 I1 7901 G10 9105 I12 9106 I13 ON 3131 5103 3218 82K BC847B 7104 3125 1K 3179 100K 100p 2150 2125 100p 2124 4R7 3202 6111 1N4148 3196 10K 3907 2902 1108 HNA 13MS09T 1 10 11 12 13 14 3184 470K 1K 3161 GND_B 3909 10K TU_GND 3120 1K 82K 2121 47u 470R 1K 470R 3106 680K 1K 3170 100R 3206 2p2 2106 2149 100p 6102 1N4148 3163 2905 560p 3212 470R 1N4148 6110 SAA6579T CIN 7...

Page 29: ...or components used in a spsecific version see schematic diagram and respective parts lists 3139 113 3449 pt 1 dd wk 103 This assembly drawing shows all possible versions For components used in a spsecific version see schematic diagram and respective parts lists 3139 113 3449 pt 1 dd wk 103 ...

Page 30: ...3139 4822 051 30102 1k 5 0 062W 3140 4822 051 30102 1k 5 0 062W 3141 4822 051 30102 1k 5 0 062W 3142 4822 051 30102 1k 5 0 062W 3143 4822 051 30102 1k 5 0 062W 3144 4822 051 30102 1k 5 0 062W 3145 4822 051 30102 1k 5 0 062W 3146 4822 051 30102 1k 5 0 062W 3147 4822 051 30102 1k 5 0 062W 3148 4822 051 30102 1k 5 0 062W 3149 4822 051 30102 1k 5 0 062W 3150 4822 051 30102 1k 5 0 062W 3151 4822 051 30...

Page 31: ...22 157 10586 2 2µH 10 0805 5902 4822 157 10586 2 2µH 10 0805 DIODES 6100 4822 130 30621 1N4148 6101 4822 130 31878 1N4003G 6102 4822 130 30621 1N4148 6103 4822 130 31878 1N4003G 6105 4822 130 34173 BZX79 B5V6 6106 4822 130 30621 1N4148 6107 4822 130 30621 1N4148 6108 4822 130 30621 1N4148 6109 4822 130 30621 1N4148 6110 4822 130 30621 1N4148 6111 4822 130 30621 1N4148 TRANSISTORS INTEGRATED CIRCUI...

Page 32: ...D O N O T P R I N T B L A N K P A G E ...

Page 33: ... 6 5 43 C D 450kHz 450kHz 450kHz 20 75kHz VStabA VStabB VStabB VStabA VStabB 10 7 MHz 10 7 MHz 35 9 Vdd Vcc1 7 23 VStabA VStabB 38 34 22 Vcc2 8 ECO6 Systems 140499 LF filter RDS MPX RDS MPX stereo clock data enable Version 1120 1 8 FM Frontend AM Frontend AM FRAME AERIAL B 1103 1101 1102 A FM MPX buffer ampl 5 Discriminator 10 7 MHz Vdd Vcc1 Vcc Vcc2 AM RF AM Osc FM Osc FM RF FM IF 1 FM IF 2 AM IF...

Page 34: ...1n 3134 22K 6105 2 HN1V02H 100n 2163 T141 7KL 1K 3144 5102 3157 100K T109 470R 3153 2130 22n 220R 3105 3142 100K 3167 120R 33p 2149 2K2 3145 1132 C PAD T103 T111 2164 470n T102 2140 15p 2139 2138 2u2 82p 2133 1u 3103 8K2 T120 4p7 2154 3156 1101USA YKD21 100K 2161 100n 5119 2119 10p T142 5123 11p 2106 3172 6106 BAS216 100n 2165 5K6 3154 3155 220R 330R 2124 33K 3176 22n WRITE EN 5114 7P MUTE P0 P1 P...

Page 35: ...riginal frame antenna has to be used 2 RC network serves for damping the IF filter while adjusting the other one 4 MW has to be aligned before LW Waverange Input frequency Input Tuned to Adjust Output Scope Voltmeter FM 87 5 108MHz 65 81 74 87 5 108MHz FM MW version 9kHz grid 531 1602kHz as low as possible ECO6 System non Cenelec stage 3 120900 TUNER BOARD ECO6 Systems non Cenelec componentside vi...

Page 36: ...10 63V RDS only RESISTORS 3101 4822 051 20333 33kΩ 5 0 1W 3102 4822 117 10837 100kΩ 1 0 1W 3103 4822 051 20822 8 2kΩ 5 0 1W 3104 4822 117 13577 330Ω 1 0 1W 3105 4822 117 11503 220Ω 5 0 1W 3132 4822 051 20479 47Ω 5 0 1W 3134 4822 051 20223 22kΩ 5 0 1W 3141 4822 117 11148 56kΩ 1 0 1W 3142 4822 100 12159 TRIMPOT 100kΩ RESISTORS 3143 4822 051 20223 22kΩ 5 0 1W RDS only 3144 4822 051 10102 1kΩ 2 0 25W ...

Page 37: ... B V Stab B V Stab A V Stab B 10 7 MHz 10 7 MHz 35 9 Vdd Vcc1 7 23 V Stab A V Stab B 38 34 22 Vcc2 8 ECO6 Systems Cenelec 140499 V Loop FM AM RF AM Osc FM IF 1 FM IF 2 LF filter MPX buffer ampl RDS MPX 5 RDS MPX stereo clock data enable Version 3 1120 AM IF 1 AM IF 2 AM AFC 1 8 AM Frontend 2 AM FRAME AERIAL B 1103 1101 1102 A FM AM FM Discriminator 10 7 MHz Vdd FM Vcc1 Vcc Vcc2 MW LW AM RF AM Osc ...

Page 38: ...108 4K7 3123 T122 T120 T127 7112 BC547C 2134 22n USA 22n USA C PAD 1131 T141 2106 11p 20p_LW 0R 4104 0R 41xx 2165 100n 1130 C PAD 10K 3180 2150 100n BZX284 C11 6107 T102 2127 220n 2169 2n2 100K 3170 1 I 3 O 2125 560p 5109 2 G 470R 3152 2108 100p 3125 10K 3153 470R 330R 3193 T103 120R 3167 100R 3195 7 8 33K 3176 8 5122 1 2 3 4 6 5123 1 2 3 4 6 7 5110 G 2 I 1 O 3 5115 1 2 3 4 6 7 8 2 3 4 6 7 8 5119 ...

Page 39: ...s low as possible Use Service Testprogram By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically AM FRAME AERIAL FM 75Ω FM FRONTEND Birdy Filter ECO6 Sys Cenelec layout stage 5 080900 1101 B5 1102 B5 1103 C5 1110 B4 1120 A4 1130 A5 1131 C5 1132 A4 2106 B4 2107 B3 2128 A3 2129 B3 2133 C1 2138 B1 2144 B1 2162 A4 2191 B4 3142 C2 5102 C4 5103 C4 5109 B3 5110 A2...

Page 40: ...W LW only RESISTORS 3132 4822 051 20479 47Ω 5 0 1W 3134 4822 051 20223 22kΩ 5 0 1W 3137 4822 051 20223 22kΩ 5 0 1W LW only 3141 4822 117 11148 56kΩ 1 0 1W 3142 4822 100 12159 TRIMPOT 100kΩ 3143 4822 051 20223 22kΩ 5 0 1W RDS only 3144 4822 051 10102 1kΩ 2 0 25W RDS only 3145 4822 117 11449 2 2kΩ 1 0 1W 3146 4822 051 20229 22Ω 5 0 1W 3150 4822 117 10833 10kΩ 1 0 1W 3151 4822 051 20683 68kΩ 5 0 1W 3...

Page 41: ...GND_B 1402 LPS 3403 820R 390R 3400 GND_B STDBY 2402 4u7 3402 47K 7400 3 GND 1 OUT 2 VS 1405 2401 4u7 TSOP2236 GND_B 1400 FE BT VK N 1 100n 4u7 2403 10K 3404 3405 100R 4u7 BC857B 7402 4u7 C C C 1 2 3 4 8239_210_88950 3444 pt 1 dd wk103 To Front Display For Low Power Standby version only 2404 2406 2405 For Provision only This assembly drawing shows all possible versions For components used in a spse...

Page 42: ... CD 3320 120R GND B CdLit SEARCH UP 1308 1K2 3307 TunerLit TapeLit AuxLit Key1Out Key1 Key0 C wOOxLit C C A B C D 100p GND B 8239_210_88920 3444 pt 1 dd wk103 To Front Display MC 50 MC 70 1313 use 3320 use 6304 use Items with 1 2 3 4 5 1 2 3 4 5 A B C A B C 60 B1 3600 A3 3601 B3 3602 B3 6600 A4 1 2 6601 B4 6602 B4 6602 LNX9A8BYBOPH 6600 22R 3601 3602 22R 6601 LNX9A8BYBOPH LightWashLit 3600 22R DIP...

Page 43: ...800 B2 2801 B3 2802 B3 4800 B2 4801 A2 5800 A2 5801 A2 5802 A2 R GND L HP_DET 1802 2802 22n 4801 2801 22n 5802 2u2 2800 22n 2u2 5801 1800 FE ST VK N 1 2 3 4 5800 2u2 1801 9 8 7 1 2 3 4 5 6 4800 TC38 8239_210_88910 3444 pt 1 dd wk103 To Combi 3139 113 3444 pt 1 dd wk 103 This assembly drawing shows all possible versions For components used in a spsecific version see schematic diagram and respective...

Page 44: ...1k2 1 1 16W 3308 4822 117 12903 1k8 1 0 063W 3309 4822 051 30272 2k7 5 0 062W 3310 4822 051 30472 4k7 5 0 062W 3311 4822 051 30103 10k 5 0 062W 3312 4822 051 30272 2k7 5 0 062W 3313 4822 051 30151 150R 5 0 062W 3314 4822 051 30221 220R 5 0 062W 3315 4822 051 30271 270R 5 0 062W 3316 4822 051 30221 220R 5 0 062W 3317 4822 051 30221 220R 5 0 062W 3318 4822 051 30221 220R 5 0 062W 3319 4822 051 30221...

Page 45: ...NS HS CTRL Deck A Pb switches sensors motor NOM HI SPEED REC EON IEC I IEC II REC EON REC EON SW HEF4952BT OSCILLATOR REC CRB Line In Playback Head Rec Pb Head Erase Head BIAS SYM ELECT SW BIAS ADJ Erase Bias REC ALCEN PRE AMPLIFIER AN7318S SOURCE SEL HEF4952BT 1A0 1A1 1A2 Rec current ATTEN ALC PLAYBACK EQUALISATION PB EON SW HEF4952BT 2A0 2A1 2A2 SHIFT REGISTER HEF4094BT 3A0 REC CRB PB Out ATTEN ...

Page 46: ...des a virtual ground for the Rec PB Head Deck B During the Playback mode the FET is turn on shorting pin 2 of connector 1710 to the ground During Recording mode the FET is turn off to allow the oscillator signal to be superposition onto the Recording signal for recording 11 IC7610 HEF4094BT IC7610 HEF4094BT is a Shift Register use for issues the logic for cmos switch ICs HEF4952BT via 1A0 2A1 and ...

Page 47: ... FLUTTER ADJUST AZIMUTH 3150Hz 2 0 4 DIN to mV meter ADJUST BIAS CURRENT RECORD 5 6 or LEFT RIGHT 1 2 or LEFT RIGHT Inject 3mV signals 100Hz 250Hz 1kHz 10kHz 12 5kHz 1 2 or LEFT RIGHT Inject 1kHz 8 85mV 3 4 or via 3 4 or via 1 2 or LEFT RIGHT RECORD B RECORD B PLAY B PLAY B mV meter THD meter check check limits see fig 2 3 RECORDED CASSETTE RECORDED CASSETTE 995mV 750mV 1 5dB 3773 check figure 1 f...

Page 48: ... see schematic diagram and respective parts lists 3139 113 3397 pt 1 dd wk 050 3 4 2 1 6 5 This assembly drawing shows all possible versions For components used in a spsecific version see schematic diagram and respective parts lists 3139 113 3397 pt 1 dd wk 050 3 4 2 1 6 5 COMPONENT LAYOUT CHIP LAYOUT ...

Page 49: ...ee Variant Table for details L Not For Single Deck Variant A2 1 NS Chrome 1 S4 0 Pb Ferro Dubbing 12K 3769 L L 12 3776 6K8 REC_R A REC A 220R 3706 A REC_L P A 150K BC557B 7782 2782 4n7 A B4 330p 2709 REC_L 3775 4R7 B4 A 10n 2717 P 1n 2727 150K 3711 6R8 15n 2784 3710 3709 6R8 A 7792 BC847B P P A 100n 2744 BC847B 7791 33n 2719 3754 1M 2725 4n7 6770 1N4148 A 2708 470p 7785 J111 REC B1 A A M A 3753 10...

Page 50: ... see schematic diagram and respective parts lists 3139 113 3397 pt 1 dd wk 050 3 4 2 1 6 5 This assembly drawing shows all possible versions For components used in a spsecific version see schematic diagram and respective parts lists 3139 113 3397 pt 1 dd wk 050 3 4 2 1 6 5 COMPONENT LAYOUT CHIP LAYOUT ...

Page 51: ...2K2 4784 2K2 5 MOTOR 3622 4K7 27K 3613 100K 3685 100K M M 3612 56K 3686 100K 47K 27K 3602 M 470R 3630 3674 1706 1 2 3 4 5 6 7 M M 3678 3676 47K M HS Vcc DECK AB L 5 3618 10K 2 3 4 5 6 7 8 2621 1n 2 3 4 5 6 7 8 9 1760 1 27K 3608 P 3620 4K7 3605 2K2 100R 3687 4785 P 2K2 3609 Os 10 Os 1 STR 16 VDD VSS 8 100n 2625 HEF4094BT 7610 3 CP 2 D 15 E0 O0 4 O1 5 6 O2 O3 7 O4 14 O5 13 O6 12 O7 11 9 MOTOR P 4K7 ...

Page 52: ...23 Flywheel Assembly Right 34 4822 358 10163 Belt 36 9965 000 07833 Motor Assembly 41 4822 278 90613 Leaf Switch 42 4822 130 10205 Photo Sensor 43 4822 116 83749 680R 5 0 5W 44 4822 277 11749 Mode Switch 71 9965 000 07834 Spring 72 9965 000 07835 Spring 101 4822 532 12931 Washer 102 4822 532 12934 Washer 103 4822 532 12932 Washer 104 4822 532 12933 Washer 105 4822 532 12935 Washer Note Only the pa...

Page 53: ...9 9 EXPLODED VIEW TAPE MODULE 1 3139 118 77920 Tape Mechanism CRH4434 4 4822 320 12605 Flex Cable 8P 7 5cm Note Only the parts mentioned in this list are normal service spare parts ...

Page 54: ...2760 4822 126 14585 100nF 10 50V 2761 4822 124 80144 220µF 20 25V 2762 4822 124 40769 4 7µF 20 100V 2763 4822 124 40433 47µF 20 25V 2765 4822 124 40433 47µF 20 25V 2769 5322 122 34099 470pF 10 63V 2770 5322 122 34099 470pF 10 63V 2780 4822 124 81151 22µF 20 50V 2781 4822 122 33177 10nF 20 50V 2782 5322 126 10223 4 7nF 10 63V 2784 4822 121 51305 15nF 10 50V 2785 4822 124 21913 1µF 20 63V 2786 5322 ...

Page 55: ... 20478 4R7 5 0 1W 3776 4822 117 11507 6k8 1 0 1W 3777 4822 117 10353 150R 1 0 1W 3778 4822 052 10688 6R8 5 0 33W 3779 4822 051 20334 330k 5 0 1W 3780 4822 051 20105 1M 5 0 1W 3781 4822 051 20475 4M7 5 0 1W 3784 4822 051 10102 1k 2 0 25W 3786 4822 051 20223 22k 5 0 1W 3787 4822 051 20105 1M 5 0 1W 3788 4822 051 20105 1M 5 0 1W 3789 4822 117 10834 47k 1 0 1W 4701 4822 051 20008 0R Jumper 0805 4702 4...

Page 56: ...8 6785 4822 130 30621 1N4148 6786 4822 130 30621 1N4148 TRANSISTORS INTEGRATED CIRCUITS 7610 5322 209 11306 HEF4094BT 7612 5322 130 60845 BC807 25 7614 5322 130 60845 BC807 25 7618 5322 130 60159 BC847B 7620 5322 130 60159 BC847B 7622 5322 130 60159 BC847B 7623 5322 130 60159 BC847B 7624 5322 130 60159 BC847B 7710 4822 209 32919 HEF4952BT 7720 4822 209 32918 AN7318S 7730 4822 209 32919 HEF4952BT 7...

Page 57: ...ockdiagram 10 11 Component Layout Main Board 10 12 Circuit Diagram part1 10 13 Component Layout Main Board 10 14 Circuit Diagram part2 10 15 Circuit Diagram part3 10 16 Exploded View 10 17 Mechanical Partslist 10 17 Electrical Partslist 10 18 3DTC Module Basic version Layout stage 4 ...

Page 58: ...emove short circuit from Laserunit 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 WARNING fig 1 Attention The laser diode of this CD drive is protected against ESD by a solder joint which shortcir...

Page 59: ...10 3 WIRING Module WIRING CD Drive ...

Page 60: ... state After Power on the changer is in this position The drawer closed Carriage 1 is in Play position Carriage 2 and 3 are in home position The Changer looks like 2 Tray open The Drawer is moved out Carriage 2 and 3 remain in home position The Changer looks like 2 3 1 Carriage Drawer Clamper 2 3 1 Carriage Drawer Clamper 10 4 ...

Page 61: ...he lower carriage It is also used during disc change The changer looks like The various states are recognized by seven switches For functions see truth table on next page 2 3 1 Carriage Carriage extra position Drawer Clamper SW8 SW7 SW6 SW2 3 SW4 5 Location of switches ...

Page 62: ... Carriage 2 under clamper Carriage 3 under clamper Carriage home recognition Carriage extra recognition 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 X X X X X X X X X SW 8 Function SW 7 SW 6 SW 5 SW 4 SW 3 SW 2 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Register output Switch 10 6 ...

Page 63: ...1 2 3 1 2 3 1 press close ACTION Carriage 2 to home position Drawer closes prepare for next action duty cycle 50 brake Time 200ms div Action Recognition CCW STOP CW CCW STOP CW SW 2 SW 3 SW 4 SW 5 SW 6 SW 7 SW 8 Switches Carriage motor Drawer motor initial final 2 3 1 2 3 1 2 3 1 2 3 1 press open 3 ACTION Carriage 2 to extra position Drawer opens prepare for next action duty cycle 50 brake 10 7 ...

Page 64: ...3 1 2 final 2 3 1 select 1 ACTION clamper up clamper down carriage 1 to play position 2 3 1 3 2 1 3 1 2 1 2 3 Time 200ms div Action Recognition CCW STOP CW CCW STOP CW SW 2 SW 3 SW 4 SW 5 SW 6 SW 7 SW 8 Switches Carriage motor Drawer motor initial 2 3 1 2 3 1 final 3 1 2 select 2 ACTION clamper up clamper down carriage 2 to play position 2 3 1 3 2 1 3 1 2 1 2 3 10 8 ...

Page 65: ...o height of carriage 3 8 Carriage 1 moves to height of carriage 2 9 Carriage 3 moves below carriage 1 10 Carriage 2 moves down 11 Carriage 1 moves in home position 12 Carriage 3 and clamper move down in play position 13 Tray moves out Load carriage 1 14 Press close Tray closes insert disc insert disc insert disc 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 ...

Page 66: ... 2 3 1 2 1 2 3 1 2 1 2 3 1 2 3 1 3 1 2 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 1 2 3 Change backwards E g select 3 while playing 1 Change forwards E g select 2 while playing 1 See also timing diagrams page 10 8 ...

Page 67: ...40 39 5 17 21 52 57 59 60 64 1 13 5V 2 4 5 7 V4 61 2 63 51 32 34 10 11 6 14 12 7 2 3 16 13 3 2 4 10 7 6 4 VDD 5V1 3 3V KILL R KILL L not connected SICL SILD RESET Blockdiagram 3DTC 2000 06 05 Closed if carriage extra has been detected SW7 SLIDER FORWARD 5 Closed if slider moves forwards Closed if slider moves backwards SW4 and SW5 define the used carriage SW6 DRAWER OPEN CLOSE SW3 13 6 Closed if c...

Page 68: ... F1 2812 F4 2813 E4 2814 F1 2815 F1 2816 F4 2817 E5 2819 E4 2820 E4 2821 F2 2822 F4 2828 F2 2829 F3 2831 D5 2832 E2 2833 D5 2834 D1 2836 E2 2842 E4 2844 D3 2846 C2 2848 C3 2849 D3 2850 E3 2852 C4 2853 D3 2854 D3 2855 C2 2856 C3 2859 D3 2861 G7 2862 C3 2865 C3 2867 E5 2869 E5 2878 B5 2879 A4 2880 A5 2881 A5 2882 B5 2885 F6 2887 F6 2888 F5 2889 E6 2890 E5 2892 E5 2893 E7 2894 E5 2895 E5 3700 F3 3701...

Page 69: ...4 3 2 1 EQSEL from part3 7814 pin11 RW DA from part2 7800 pin61 Innersw VrefCD10 Vref Vref Vref VDD 12 1 2 5 3 4 8 14 15 10 11 6 7 16 13 9 TO SERVOPOCESSOR 7800 on PART2 FROM SIGNALPOCESSOR 7800 on PART2 Σ D2 D4 Audio signal VrefCD10 7806 BC847B 3811 82K 3812 10K 5V 1 9V 1 6V 4 7V 5V 4 7V 5V 1 6V 1 6V 1 6V 1 6V 10V 10V 0 3V 5 1V 0 3V 4 9V 4 6V 1 6V 1 6V 4 8V 1V 0V 0 8V 4 7V 0 2V 0 9V 1 6V 1 7V 2 9...

Page 70: ... F1 2812 F4 2813 E4 2814 F1 2815 F1 2816 F4 2817 E5 2819 E4 2820 E4 2821 F2 2822 F4 2828 F2 2829 F3 2831 D5 2832 E2 2833 D5 2834 D1 2836 E2 2842 E4 2844 D3 2846 C2 2848 C3 2849 D3 2850 E3 2852 C4 2853 D3 2854 D3 2855 C2 2856 C3 2859 D3 2861 G7 2862 C3 2865 C3 2867 E5 2869 E5 2878 B5 2879 A4 2880 A5 2881 A5 2882 B5 2885 F6 2887 F6 2888 F5 2889 E6 2890 E5 2892 E5 2893 E7 2894 E5 2895 E5 3700 F3 3701...

Page 71: ...12 13 14 F G B A 1 2 3 4 5 6 7 8 9 10 11 H I 3 3V 4 1V V DC voltages measured in PLAY MODE with following conditions 10V 10V 5V 5V EVM V 17 4 5 6 7 FE ST VK N 19 18 9 8 14 2 11 3 12 13 16 15 1 10 SILD SICL SHR_DATA LEFT GND EBU_GND GND GNDA EBU RIGHT RAB DATA A Not Connected SW_INFO SHR_CL 5V GND GND 1803 RAB 3754 SDA SICL SILD EBU 470R 3743 DOBM 10K 3858 3860 3849 3865 TDA1308T TDA1308T 2889 220p...

Page 72: ... 10V RESET SHR_CL SHR_DATA _ _ Motor Driver 7815 TDA7073A VDD 12 1 2 5 3 4 8 14 15 10 11 6 7 16 13 9 2706 10u SRG8 EN1 1 D STB 7 14 11 13 12 9 10 1 16 8 HEF4094BT 7813 3 2 15 4 5 6 6810 6809 6808 6807 6804 6806 6805 BAS316 7x SW3 SLIDER REVERSE SLIDER FORWARD CARRIAGE EXTRA SW4 5 7 SW2 CARRIAGE NUMBER CARRIAGE HOME SW_INFO SW7 8 DRAWER OPEN CLOSE 1 3 2 CARRIAGE NUMBER SW8 6 4 8002 SW6 SW5 6 7 8 18...

Page 73: ...0 06539 ASSY HOLDER RIGHT 12 9965 000 06540 ASSY CARRIAGE 1 TOP 19 9965 000 06541 ASSY GEAR STAR 48 9965 000 06542 ASSY MOTOR CARRIAGE 49 9965 000 06543 ASSY MOTOR DRAWER 53 9965 000 06544 BELT DRAWER 54 9965 000 06545 BELT CARRIAGE 57 9965 000 06546 DAMPER RUBBER REAR 58 9965 000 06547 DAMPER RUBBER FRONT 59 9305 022 30103 CD DRIVE VAM2201 03 62 9965 000 06548 ASSY CARRIAGE 2 MIDDLE 63 9965 000 0...

Page 74: ...22 051 30103 10kΩ 5 0 06W 3771 4822 051 30391 390Ω 5 0 062W 3772 4822 051 30563 56kΩ 5 0 06W 3773 4822 051 30331 330Ω 5 0 06W 3774 4822 051 30183 18kΩ 5 0 06W 3775 4822 117 12925 47kΩ 1 0 06W 3776 4822 051 30223 22kΩ 5 0 06W 3777 4822 051 30331 330Ω 5 0 06W 3778 4822 051 30183 18kΩ 5 0 06W 3779 4822 052 10338 3 3Ω NFR25 3780 4822 117 11503 220Ω 5 0 1W 3781 4822 051 30153 15kΩ 5 0 06W 3782 4822 051...

Page 75: ...el approx 4 5V power amplifiers switched on Low level approx 0V power amplifiers switched off Super class G operation The power amplifiers operate as so called super class G amplifiers The supply pins 12 Vcc are not just connected to one fixed DC supply as in conventional amplifiers Dependent on the output power there are three different DC voltages supplied to the power amplifiers C 17V for low o...

Page 76: ... and symmetrical load to the mains transformer Generation of A1 Common full wave rectifying with bridge rectifier 6202 using 100 secondary winding of mains transformer pin 10 14 Generation of B1 The supply for B1 consists of one full wave rectifier 2 diodes of bridge rectifier 6202 with 6200 6201 for generation of B1 using approx 70 secondary winding of mains transformer pin 10 13 respectively pin...

Page 77: ...OUT MUTE MUTE I 2 C DATA I 2 C CLK 5V6 C1 B1 12V_D LOW PWR CTRL 12V_A Blockdiagram Power2001 40W SuperG 2001 02 28 2201 2215 2205 2216 6201 6200 6206 6325 B1 C1 50V A1 1207 1200 1212 1205 6202 5001 17 10 11 12 13 14 8 9 15 16 2341 1204 Mains socket 1210 Stand by Relais NTC F1 F2 is used for monitoring the transformer temparature LOW_PWR_SUP is used to supply the microprocessor during ECO stand by ...

Page 78: ...5 6215 A5 6216 A3 6217 A2 6218 A2 6220 B5 6221 B5 6222 B5 6223 B5 7200 B5 7201 A3 7202 A3 7203 B5 9206 C1 9208 C1 9210 D1 9211 D4 9212 A5 9213 C1 9214 B5 9216 A3 9217 A5 9219 C1 9221 D3 9222 D3 9223 C4 9224 B2 9225 B4 9226 D4 9228 D4 9229 B5 9230 C4 9231 D3 9232 D2 9233 D4 9234 D3 9235 C4 9236 C3 9237 C3 9238 C3 9239 C3 9240 C3 9241 C3 9242 A4 9243 C2 9244 C4 9245 A4 9246 C3 9247 C5 9248 C4 9252 B...

Page 79: ...212 3202 3K9 6m8 2215 9211 not for 22 4m7 2200 6202 GBU8D 6211 4m7 2205 LOW_PWR_CTR LOW_PWR_SUP LOW_PWR_SUP F1 LOW_PWR_CTR F2 NTC LOW_PWR_SUP LOW_PWR_CTR LOW_PWR_SUP LOW_PWR_SUP F2 F1 NTC A1 B1 50V 4R7 3211 PowerDown Low Power Stand by for 22 only MAINS Board Power2001 40W SuperG MainsBoard 2001 02 21 PowerDown PWR_DWN DC voltages measured with low output power V EVM V 34V 6V 6V 6V 6V 4 5V 24V 23V...

Page 80: ...65 F1 3066 F1 3071 C1 3073 C9 3077 C9 3079 C1 3081 C9 3082 C9 3083 B3 3084 A3 3085 A3 3087 B4 3088 B3 3089 A3 3091 B4 3094 A1 3095 A1 3096 E2 3097 E1 3098 A9 3099 A8 3100 A8 3101 A8 3102 A8 3105 E2 3106 E1 3107 B1 3110 B5 3111 B5 3301 E8 3302 C8 3303 E8 3304 D8 3305 F4 3306 E4 3307 E8 3308 C8 3314 E6 3318 F6 3323 F7 3326 F8 3327 F8 3328 D8 3329 F7 3331 E6 3336 E7 3337 C7 3341 F8 3342 F7 3359 F3 33...

Page 81: ...11 12 13 14 15 1304 FE BT VK N 1 2 3 4 5 6 7 0u47 2511 2512 0u47 2081 1u 12V_A 1u 2080 1 2 3 4 5 6 7 8 9 1314 EH B 1u 2020 100n 2003 2522 2504 3064 2K7 470p 470p 3089 82K 2506 YKC21 3418 3424 COMBI 1 2 15p 2028 3043 2K7 3036 1001 A 1K5 470p 470p 2501 2508 3051 2K2 470R 3038 15K 3029 10K 3027 3024 15K 3022 10K 7007 BC847B 2552 22n 2551 22u 2549 100n 2056 1u 2000 10n 2025 1001 B YKC21 3418 3424 COMB...

Page 82: ...1 E8 3312 D9 3315 E6 3340 F8 3353 E6 3366 F5 3713 E2 5001 A9 5300 D8 5301 E8 5302 C8 5303 E8 5700 F2 6000 F3 6001 F3 6002 B2 6003 A6 6005 C2 6300 F9 6301 E8 6302 F9 6303 E8 6304 D6 6306 F6 6307 F7 6308 C6 6311 D6 6315 F7 6323 F6 6324 F6 6325 D5 6326 F3 6327 F3 6328 F5 6331 D5 6332 F6 7301 E8 7302 C8 7304 D8 7309 F8 9201 B8 9202 B8 9203 A7 9204 E2 9205 B7 9206 B7 9207 A8 9208 A7 9209 B6 9210 B6 921...

Page 83: ...0 3K9 2K2 3081 3082 2K2 BC817 25 7012 470p 2057 470R 3073 2324 47p 5700 3336 5K6 3323 47K 4K7 3327 2u2 I2C_DATA I2C_CLK 3314 2K2 4R7 3309 5V AMP_ON AMP_ON MUTE_SW MUTE_SW HP_DET HP_DET MUTE_HP MUTE_HP AMP_MUTE MIC_DET MIC_DET MUTE_LINE 5V CD ON MUTE_LINE 12V_A SUB_W AMP_RIGHT AMP_RIGHT AMP_LEFT AMP_LEFT CL_DET Source Selector part 50V 50V 12V_A VOL_LEFT VOL_RIGHT A Power2001 40W SuperG Combi Ampli...

Page 84: ... 11 10 This assembly drawing shows all possible versions For components used in a specific version see schematic diagram respectively parts lists 3139 113 3441 pt 1 dd wk 103 Regulator Board Copperside view ...

Page 85: ...400 EH B 1 2 470R 3411 BC547B 7419 3437 100K 100K 3438 3434 9402 7409 BC327 25 120R 180R 3432 150R 3428 1171 330R 3419 EH B 1401 1 10 11 2 3 4 5 6 7 100K 3426 BC557B 2407 100u 7402 100u 2406 100n 2408 1K 3413 6404 1N4148 100R 3427 2413 10u 10K 3410 6407 BZX55 B4V7 1K 3412 10u 2409 7421 BC547B 2405 10u 1K 3414 6413 BZX79 B3V9 2415 10u 2416 47u 1403 1 2 3 4 5 6 6401 EH B 100n 2404 1N4148 7410 BD438 ...

Page 86: ...11 12 This assembly drawing shows all possible versions For components used in a specific version see schematic diagram respectively parts lists 3139 113 3441 pt 1 dd wk 103 Regulator Board Componentside view ...

Page 87: ...3029 4822 051 30153 15kΩ 5 0 06W 3031 4822 051 30103 10kΩ 5 0 06W 3032 2120 108 91909 39Ω 5 0 06W 3033 2120 108 91909 39Ω 5 0 06W 3034 4822 051 30103 10kΩ 5 0 06W 3035 4822 051 30103 10kΩ 5 0 06W 3041 4822 051 30273 27kΩ 5 0 06W 3042 4822 051 30102 1kΩ 5 0 06W 3043 4822 051 30152 1 5kΩ 5 0 06W 3046 4822 116 81154 2 2Ω 5 0 5W 3048 4822 051 30562 5 6kΩ 5 0 06W 3050 4822 051 30273 27kΩ 5 0 06W 3052 4...

Page 88: ... 30471 470Ω 5 0 06W 3711 4822 051 30273 27kΩ 5 0 06W 3712 4822 051 30472 4 7kΩ 5 0 06W 3713 4822 052 10109 10Ω 5 NFR 3714 4822 051 30472 4 7kΩ 5 0 06W 3716 4822 051 30339 33Ω 5 0 06W 3717 4822 051 30339 33Ω 5 0 06W 3718 4822 051 30339 33Ω 5 0 06W 4201 4822 051 30008 CHIP JUMPER 0603 4202 4822 051 30008 CHIP JUMPER 0603 4203 4822 051 30008 CHIP JUMPER 0603 4204 4822 051 30008 CHIP JUMPER 0603 4205 ...

Page 89: ...5 0 2W 3413 4822 050 11002 1kΩ 5 0 2W 3414 4822 050 11002 1kΩ 5 0 2W 3415 4822 116 52199 68Ω 5 0 16W 3416 4822 116 52206 120Ω 5 0 5W 3417 4822 116 52206 120Ω 5 0 5W 3418 4822 117 12063 10kΩ NTC 3419 4822 116 52219 330Ω 5 0 5W 3420 4822 050 11002 1kΩ 5 0 2W 3421 4822 052 10568 5 6Ω 5 0 33W 3422 4822 050 21003 10kΩ 2 0 25W DIODES 6400 4822 130 30621 1N4148 6401 4822 130 30621 1N4148 6402 4822 130 34...

Page 90: ...D O N O T P R I N T B L A N K P A G E ...

Page 91: ...12 1 12 1 EXPLODED VIEW MAIN UNIT 3139 119 33730 MC 70 dd wk 102 ...

Page 92: ...ire 37 356 3139 118 78640 Remote Control 21 21M 37 356 3139 118 78630 Remote Control 22 384 4822 303 50082 AM Frame Antenna 385 2422 070 98151 Mains Cord 21 21M 22 385 2422 070 98152 Mains Cord 37 386 4822 263 21092 Adapter Plug 6A 250V 21 387 3139 115 20780 Instruction For Use 21 21M 387 3139 115 20740 Instruction For Use 22 387 3139 115 20750 Instruction For Use 37 1110 4822 361 11161 Cooling Fa...

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