Sony CFM-A50 Service Manual
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Sony CFM-A50 Service Manual

Sony CFM-A50 Service Manual

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SERVICE MANUAL
Ver. 1.2 2005.06
Radio section
Frequency range
FM 87.6 – 108MHz (US model)
FM 87.6 – 107MHz (AEP, UK model)
AM 530 – 1,710kHz (US model)
MW 531 – 1,602kHz (AEP, UK model)
LW 153 – 279kHz (AEP, UK model)
Aerials
FM : Telescopic aerial
AM : Built-in ferrite bar aerial
Cassette-corder section
Recording system
2-track 1channel monaural
Fast winding time
Approx. 120 s (sec.) with Sony cassette C-60
Frequency response
TYPE I (normal) : 100 – 8,000Hz
General
Speaker
Full range : 9.2cm dia.,4 ohms, cone type (1)
Output
Earphone jack (minijack)
For 32 ohms impedance earphone
9-923-167-14
2005F02-1
© 2005.06
Downloaded from
www.Manualslib.com
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
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CFM-A50
Model Name Using Similar Machanism
Tape Transport Mechanism Type
SPECIFICATIONS
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 :
Sony alkaline LR20 :
Tape playback
Sony R20P :
Sony alkaline LR20 :
Dimensions
Approx. 289 x 200 x 123 mm (w/h/d)
1
7
(11
/
x 7
/
x 4
2
8
Mass
Approx. 2.4 kg (5 lb. 5 oz) (incl. batteries)
Supplied accessory
AC power cord (1)
Earphone (1)
Design and specifications are subject to change without notice.
RADIO CASSETTE-CORDER
US Model
AEP Model
UK Model
NEW
MF-A50-117
approx. 13h
approx. 35h
approx. 7h
approx. 20h
7
/
inches) (incl. projecting parts)
8

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Summary of Contents for Sony CFM-A50

  • Page 1 Sony R20P : approx. 7h Fast winding time Sony alkaline LR20 : approx. 20h Approx. 120 s (sec.) with Sony cassette C-60 Dimensions Frequency response Approx. 289 x 200 x 123 mm (w/h/d) TYPE I (normal) : 100 – 8,000Hz inches) (incl.

  • Page 2: Table Of Contents

    MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. 5. DIAGRAMS REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN 5-1. Schematic Diagram (AEP,UK Model) ...... 12 SUPPLEMENTS PUBLISHED BY SONY.

  • Page 3: General

    SECTION 1 GENERAL SAFETY CHECK-OUT This section is extracted from instruction manual. After correcting the original service problem, perform the follow- ing safety check before releasing the set to the customer : LOCATION AND FUNCTION OF CONTROLS Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage.

  • Page 4: Disassembly

    Ver 1.1 2001.11 SECTION 2 DISASSEMBLY The equipment can be removed using the following procedure. AEP, UK model Cabinet (Rear) assy ISS SW board , BATTERY CASE, BATTERY board, POWER board Cabinet (Front) assy Main board, TUN LED board, TACT SW board H/P JACK board, DOOR EAR (PH), BOX EAR (PH) Mechanism deck, DECK CONTROL board, VOLUME board...

  • Page 5: Main Board, Tun Led Board, Tact Sw Board Removal

    2-3. MAIN BOARD, TUN LED BOARD, TACT SW BOARD REMOVAL Main board 1 Screws (+BV 3x10) Chassis, TU TACT SW board TUN LED board Cabinet (Front) assy 2-4. H/P JACK BOARD, DOOR EAR (PH), BOX EAR (PH) REMOVAL H/P JACK board 4 Screw (+BV 3x10) 6 Screw (+BV 3x10)

  • Page 6: Mechanism Deck, Deck Control Board Volume Board Removal

    2-5. MECHANISM DECK, DECK CONTROL BOARD, VOLUME BOARD REMOVAL 3 Screws (+BV 3x10) Mechanism deck 7 Knob (TONE SW) 5 Screws (+BV 3x10) 7 Knob (VOL) DECK CONTROL board 3 Screw +BV (3x10) 8 Screws (+BV 3x10) Volume board Cabinet (Front) assy –...

  • Page 7: Dial Pointer Setting

    SECTION 3 DIAL POINTER SETTING Note : Follow the instaooation procedure in the numerical order given. Attach TU worm to tuner chassis. Attach needle, tighten needle spring using a bolt, then attach TU LED board. Rotate TU worm until needle stops at the stopper shown in Fig. A. 2 Pointer Screw (+P 2.6x5) Retainer, Pointer...

  • Page 8: Adjustments

    SECTION 4 ADJUSTMENTS 4-1. MECHANICAL ADJUSTMENTS 4-2. ELECTRICAL ADJUSTMENTS TAPE RECORDER SECTION PRECAUTION 1. Clean the following parts wit2h a denatured-alcohol-moistened FUNCTION switch : TAPE (RADIO OFF) swab : SLOW PLAYBACK switch : OFF record/playback head pinch roller EASY LISTENING ADJUSTMENT switch : OFF erase head rubber belts VOLUME...

  • Page 9: Diagrams

    SECTION 5 DIAGRAMS Tape Speed Adjustment AEP, UK model CIRCUIT BOARDS LOCATION TUNER SECTION FM FREQUENCY COVERAGE ADJUSTMENT Procedure : Adjust for a maximum reading on level meter. LW FREQUENCY COVERAGE ADJUSTMENT 1. Mode : Playback (Normal Speed) AM Section 86.5MHz (87MHz) Adjust for a maximum reading on level meter.

  • Page 10: Schematic Diagram (Aep,Uk Model)

    CFM-A50 5-1. SCHEMATIC DIAGRAM (AEP,UK MODEL) Refer to page 26 for IC Block Diagrams. Note: • All capacitors are in µF unless otherwise noted. pF: µµF • Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions.
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  • Page 13: Schematic Diagram (Us Model)

    CFM-A50 5-4. SCHEMATIC DIAGRAM (US MODEL) Refer to page 26 for IC Block Diagrams. Note: • All capacitors are in µ F unless otherwise noted. pF: µµ F • Voltages and waveforms are dc with respect to ground un- 50 WV or less are not indicated except for electrolytics der no-signal (detuned) conditions.

  • Page 14: Exploded Views

    SECTION 6 Ver 1.1 2001.11 EXPLODED VIEWS NOTE : IC BLOCK DIAGRAMS IC102 CXA1352AS • -XX, -X mean standardized parts, so they • The mechanical parts with no reference may have some difference from the original number in the exploded views are not The components identified by mark ! IC1 CXA1611P or dotted line with mark ! are critical...

  • Page 15: Cabinet (Front) Section

    Ver. 1.2 6-2. CABINET (FRONT) SECTION 68 69 70 supplied SP101 US Model MIC101 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3373-854-1 CABINET (FRONT) SUB ASSY (WHITE) 3-008-140-11 SCALE, DIAL (AEP,UK) (AEP,UK) 3-008-140-21 SCALE, DIAL (US) X-3374-233-1 CABINET (FRONT) SUB ASSY (WOOD) (AEP,UK) * 79...

  • Page 16: Mechanism Deck Section-1 (Mf-A50-117)

    6-3. MECHANISM DECK SECTION-1 (MF-A50-117) HRP101 HE101 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-933-010-01 SPRING (S/P), TORSION * 115 3-933-021-01 SLIDER (FRP) 3-933-025-01 SPRING (P), TORSION * 116 3-933-006-01 SLIDER (EJECT) 3-933-026-01 LEVER (P) 3-934-833-01 SPRING (FRP) 3-933-024-01 ROLLER, PINCH 3-934-834-01 SPRING (BT)

  • Page 17: Mechanism Deck Section-2 (Mf-A50-117)

    6-4. MECHANISM DECK SECTION-2 (MF-A50-117) S106 C155 M101 C301 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-933-029-01 LEVER, ERASING PREVENTION 3-932-993-22 CHASSIS, OUTSERT 3-933-182-01 SPRING, CASSETTE 3-343-358-01 RING, RETAINING 3-932-995-01 GEAR (MID) 3-933-005-01 SPRING (CAM), COMPRESSION X-3371-667-1 CLUTCH ASSY 3-934-336-01 BEARING 3-932-997-01 GEAR (CAM)

  • Page 18: Electrical Parts List

    BATTERY DECK CONTROL SECTION 7 H/P JACK ISS SW MAIN ELECTRICAL PARTS LIST NOTE : • Due to standardization, replacements in the • SEMICONDUCTORS In each case, u : µ , for example : The components identified by mark ! parts list may be different from the parts uA..
  • Page 19 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-162-294-31 CERAMIC 0.001uF C148 1-130-048-00 FILM 220PF 1-124-907-11 ELECT 10uF (AEP,UK) 1-104-664-11 ELECT 47uF C151 1-162-282-31 CERAMIC 100PF 1-162-306-11 CERAMIC 0.01uF C152 1-136-495-11 MYLAR 0.1uF 1-104-731-11 FILM 270PF 100V (US)
  • Page 20 MAIN POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D114 8-719-064-46 LED SLA-560JT3F (TUNING BACK-LIGHT) R110 1-247-807-31 CARBON 1/4W D115 8-719-987-63 DIODE 1N4148M R111 1-249-413-11 CARBON 1/4W D116 8-719-987-63 DIODE 1N4148M R112 1-249-393-11 CARBON 1/4W D117 8-719-987-63 DIODE 1N4148M R113...
  • Page 21 POWER TACT SW TUN LED VOLUME Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C902 1-101-005-00 CERAMIC 0.022uF < VARIABLE RESISTOR > (US) C902 1-164-159-11 CERAMIC 0.1uF RV101 1-225-388-11 RES, VAR, CARBON 20K (VOLUME) (AEP,UK) RV102 1-225-389-11 RES, VAR, CARBON 500K C903 1-101-005-00 CERAMIC...
  • Page 22 CFM-A50 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 1997.08...

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