Sony CFM-A50, Service Manual

Page 1: ... 32 ohms impedance earphone Maximum power output 2 3 W Power requirements 120V AC 60Hz US model 230V AC 50Hz AEP UK model 6V DC four R20 size D batteries Power consumption AC 6W Battery life FM recording Sony R20P approx 13h Sony alkaline LR20 approx 35h Tape playback Sony R20P approx 7h Sony alkaline LR20 approx 20h Dimensions Approx 289 x 200 x 123 mm w h d 111 2 x 7 7 8 x 4 7 8 inches incl proj...

Page 2: ...ection 29 6 3 Mechanism Deck Section 1 MF A50 117 30 6 4 Mechanism Deck Section 2 MF A50 117 31 7 ELECTRICAL PARTS LIST 32 SAFETY RELATED COMPONENT WARNING COMPONENTS IDENTIFIED BY MARK OR DOTTED LINEWITH MARK ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PU...

Page 3: ... below LEAKAGE TEST The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis must not exceed 0 5mA 500 microampers Leakage current can be measured by any one of three methods 1 A commercial leakage tester such as the Simpson 229 or RCA WT 540A Follow the manufacturers instructions to use these instruments 2 A b...

Page 4: ...ard Main board TUN LED board TACT SW board Mechanism deck DECK CONTROL board VOLUME board Cabinet Rear assy Set Cabinet Front assy AEP UK model H P JACK board DOOR EAR PH BOX EAR PH 1 4 3 5 ANT1 Knob TU Cabinet Front assy Cabinet Rear assy 2 Screws BV 3X14 2 Screws BV 3X14 5 8 7 2 Cabinet Rear assy AEP UK model BATTERY board ISS SW board Battery case Cabinet Rear assy Stoper wire 3 Screw BV 3x10 1...

Page 5: ...4 4 3 7 6 1 Screws BV 3x10 Cabinet Front assy Main board Chassis TU TACT SW board TUN LED board 2 4 H P JACK BOARD DOOR EAR PH BOX EAR PH REMOVAL 5 1 1 2 3 H P JACK board 4 Screw BV 3x10 4 Screw BV 3x10 6 Screw BV 3x10 Box ear PH DOOR ear PH Cabinet Front assy ...

Page 6: ...SM DECK DECK CONTROL BOARD VOLUME BOARD REMOVAL 1 6 9 4 2 DECK CONTROL board Volume board 8 Screws BV 3x10 5 Screws BV 3x10 3 Screw BV 3x10 3 Screws BV 3x10 7 Knob TONE SW 7 Knob VOL Cabinet Front assy Mechanism deck ...

Page 7: ...ted part of the tuner chassis fits as shown in Fig C the arrow 6 Tighten idler gear combine projected part of band knob and the band slider so that they interlock then mount to main board 7 Mount VR gear to main board then turn in the direction of the arrow until it stops 8 Fasten the TU gear to the TU chassis with the screw 3 Screw P 2 6x5 Retainer Pointer Fig A Fig B Fig C 1 Worm TU 5 Knob band ...

Page 8: ...1B more than 50 g cm more than 0 7 oz inch Rewind CQ 201B more than 50 g cm more than 0 7 oz inch Tape Tension Measurement Torque Meter Meter Reading CQ 403A more than 70g more than 2 47 oz 4 2 ELECTRICAL ADJUSTMENTS TAPE RECORDER SECTION FUNCTION switch TAPE RADIO OFF SLOW PLAYBACK switch OFF EASY LISTENING ADJUSTMENT switch OFF VOLUME MIN Standard Output Level Output terminal Earphone Speaker lo...

Page 9: ...l generator 22 5kHz frequency deviation by 400Hz signal Output level as low as possible telescopic antenna terminal 0 01µF set 32Ω J101 Earphone jack level meter r CIRCUIT BOARDS LOCATION MAIN board BATTERY board DECK CONTROL board TACT SW board H P JACK board TUN LED board POWER board VOLUME board ISS SW board AEP UK model FM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level met...

Page 10: ...lace only with part number specified U B Line H adjustment for repair Power voltage is dc 6 V and fed with regulated dc power supply from external power voltage jack 5 1 SCHEMATIC DIAGRAM AEP UK MODEL r Refer to page 26 for IC Block Diagrams CFM A50 Voltages and waveforms are dc with respect to ground under no signal detuned conditions no mark FM MW LW Voltages are taken with aVOM Input impedance ...

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Page 13: ...ents identified by mark or dotted line with mark are critical for safety Replace only with part number specified U B Line H adjustment for repair Power voltage is dc 6 V and fed with regulated dc power supply from external power voltage jack CFM A50 Voltages and waveforms are dc with respect to ground un der no signal detuned conditions no mark FM AM Voltages are taken with a VOM Input impedance 1...

Page 14: ...t stocked since they are seldom required for routine service Some delay should be anticipated when ordering these items The mechanical parts with no reference number in the exploded views are not supplied Hardware mark list and accessories and packing materials are given in the last of this parts list Ref No Part No Description Remark Ref No Part No Description Remark 6 1 CABINET REAR SECTION The ...

Page 15: ...61 11 TACT SW BOARD 6 2 CABINET FRONT SECTION 77 3 008 140 11 SCALE DIAL AEP UK 77 3 008 140 21 SCALE DIAL US 79 A 3306 588 A MAIN BOARD COMPLETE AEP UK 79 A 3321 069 A MAIN BOARD COMPLETE US 80 3 008 141 01 GEAR TU 81 3 008 143 01 GEAR VR 82 3 008 139 01 SLIDER BAND 83 3 008 138 01 KNOB BAND AEP UK 83 3 025 667 01 KNOB BAND US 84 3 008 142 01 GEAR IDLER 85 3 008 133 01 LIMITTER TU 86 3 008 132 01...

Page 16: ...Part No Description Remark Ref No Part No Description Remark 115 3 933 021 01 SLIDER FRP 116 3 933 006 01 SLIDER EJECT 117 3 934 833 01 SPRING FRP 118 3 934 834 01 SPRING BT 119 3 933 007 01 PLATE LOCK 123 3 009 076 01 CHASSIS HEAD 124 3 010 625 01 GUIDE TAPE 125 3 342 917 01 SCREW IT3 C TAPPING B 126 3 936 265 01 LUG T PLATE 127 4 936 201 01 SPRING COMPRESSION 128 3 015 242 01 SHEET TU HE101 1 50...

Page 17: ...9 650 02 SPRING K COMPRESSION 160 X 3373 572 1 REEL ASSY N T 161 3 933 020 01 BELT 162 X 3371 668 1 CAPSTAN ASSY 163 3 932 993 22 CHASSIS OUTSERT 164 3 343 358 01 RING RETAINING 165 3 933 005 01 SPRING CAM COMPRESSION 166 3 934 336 01 BEARING 167 3 939 383 02 SPRING COMPRESSION 168 3 936 438 01 LEVER K 169 3 016 349 01 WASHER C301 1 131 381 00 TANTALUM 47uF 10 10V C155 1 162 839 11 CERAMIC 0 01 10...

Page 18: ... 1 249 414 11 CARBON 560 5 1 4W R132 1 249 411 11 CARBON 330 5 1 4W R133 1 249 435 11 CARBON 33K 5 1 4W R134 1 249 427 11 CARBON 6 8K 5 1 4W R143 1 249 417 11 CARBON 1K 5 1 4W VARIABLE RESISTOR RV103 1 228 991 00 RES ADJ METAL 2 2K TAPE SPEED SWITCH S104 1 570 347 11 SWITCH LEVER SLIDE FUNCTION S105 1 571 890 11 SWITCH LEAF SLOW PLAYBACK 1 664 067 11 H P JACK BOARD CAPACITOR C138 1 104 664 11 ELEC...

Page 19: ...ERAMIC 220PF 10 50V C142 1 162 286 31 CERAMIC 220PF 10 50V C144 1 162 286 31 CERAMIC 220PF 10 50V C145 1 162 286 31 CERAMIC 220PF 10 50V C146 1 162 286 31 CERAMIC 220PF 10 50V C147 1 162 303 11 CERAMIC 0 0033uF 30 16V C148 1 130 048 00 FILM 220PF 5 50V AEP UK C151 1 162 282 31 CERAMIC 100PF 10 50V C152 1 136 495 11 MYLAR 0 1uF 5 50V US C153 1 136 495 11 MYLAR 0 1uF 5 50V US C154 1 136 169 00 FILM ...

Page 20: ...W R108 1 249 413 11 CARBON 470 5 1 4W R109 1 247 807 31 CARBON 100 5 1 4W R110 1 247 807 31 CARBON 100 5 1 4W R111 1 249 413 11 CARBON 470 5 1 4W R112 1 249 393 11 CARBON 10 5 1 4W R113 1 249 413 11 CARBON 470 5 1 4W R114 1 247 815 91 CARBON 220 5 1 4W R115 1 247 807 31 CARBON 100 5 1 4W R116 1 249 429 11 CARBON 10K 5 1 4W R117 1 247 863 91 CARBON 22K 5 1 4W R118 1 249 413 11 CARBON 470 5 1 4W R11...

Page 21: ...MISCELLANEOUS 16 1 533 233 31 HOLDER FUSE ANT1 1 501 901 11 ANTENNA HELICAL C155 1 162 839 11 CERAMIC 0 01 10 16V C301 1 131 381 00 TANTALUM 47uF 10 10V F901 1 532 285 00 FUSE TIME LAG T1 25AL 250V AEP UK F901 1 576 101 11 FUSE GLASS TUBE 1 25A 250V US HE101 1 500 131 11 HEAD MAGNETIC ERASE HRP101 1 500 363 11 HEAD MAGNETIC RECORD PLAYBACK M101 A 3311 283 A MOTOR ASSY MIC101 8 814 186 00 MICROPHON...

Page 22: ...per right on the revised page allows you to jump to the next revised page Ver Date Description of Revision 1 0 1997 08 New 1998 02 Change of mechanism deck parts 1 1 2001 11 Change of disassembly Change of exploded views delete of Ref No 13 RPC 01006 1 2 2005 06 Addition of Ref No 100 mechanism deck MF A50 117 SPM 05079 ...