Sony xr-c6120 Service Manual
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Sony xr-c6120 Service Manual

Fm/am cassette car stereo
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SERVICE MANUAL
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol a are trade-
marks of Dolby Laboratories Licensing Corporation.
MICROFILM
XR-C6120
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
SPECIFICATIONS
FM/AM CASSETTE CAR STEREO
US Model
Canadian Model
XR-C5100
MG-25F-136

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  • Page 1 XR-C6120 SERVICE MANUAL US Model Canadian Model Dolby noise reduction manufactured under license Model Name Using Similar Mechanism XR-C5100 from Dolby Laboratories Licensing Corporation. Tape Transport Mechanism Type MG-25F-136 “DOLBY” and the double-D symbol a are trade- marks of Dolby Laboratories Licensing Corporation.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Flexible Circuit Board Repairing • Keep the temperature of the soldering iron around 270 ˚C dur- ing repairing. GENERAL • Do not touch the soldering iron on the same conductor of the Location of Controls ............3 circuit board (within 3 times).
  • Page 3 SECTION 1 This section is extracted from instruction manual. GENERAL – 3 –...
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  • Page 9: Disassembly

    SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. SUB PANEL, MECHANISM DECK (MG-25F-136) 5 screw (PTT2.6 × 6) 3 connector (CN351) 6 mechanism deck (MG-25F-136) 4 flexible flat cable (CN301) 2 sub panel 1 three screws (PTT2.6 ×...

  • Page 10: Assembly Of Mechanism Deck

    SECTION 3 ASSEMBLY OF MECHANISM DECK Note: Follow the assembly procedure in the numerical order given. 7 Holder the hanger by bending the claw. HOUSING 5 Fit projection on C part. 1 Install the catch to the hanger. 2 Install the hanger onto two claws of the housing.
  • Page 11 LEVER (LDG-A)/(LDG-B) shaft A shaft A shaft B shaft B shaft C 1 Fit the lever (LDG-A) on shafts A – C and install it. 3 type-E stop ring 2.0 2 Fit the lever (LDG-B) on shafts A and B and install it.
  • Page 12 GUIDE (C) 2 guide (C) 1 three claws MOUNTING POSITION OF CAPSTAN/REEL MOTOR (M901) two precision screws (P2 × 2) capstan/reel motor (M901) 30˚ – 12 –...

  • Page 13: Mechanical Adjustments

    SECTION 4 SECTION 5 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS TEST MODE 1. Clean the following parts with a denatured-alcohol-moistened swab: <Set the Test Mode> playback head pinch roller 1. Set the “power select” switch (S501) is “A (ON)” position. rubber belt capstan 2.

  • Page 14: Tuner Section

    Dolby Level Adjustment TUNER SECTION 0 dB=1 µV Setting: [SHIFT] The tuner section has no adjustment. button : ON Preset (PLAY MODE) and → ) buttons : NR OFF SOUND (BAS) button : Center SOUND (TRE) button : Center SOUND (BAL) button : Center SOUND (FAD) button : Center...
  • Page 15 Adjustment Location: – SET UPPER VIEW – Tape Speed Adjustment RV201 RV101 (R-CH) (L-CH) Dolby Level Adjustment – MAIN BOARD (Conductor Side) – TP (DOLBY-R) Dolby Level IC301 TP (GND) Adjustment TP (DOLBY-L) – 15 –...

  • Page 16: Diagrams

    SECTION 6 DIAGRAMS 6-1. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS Note on Printed Wiring Board: Note on Schematic Diagram: • X : parts extracted from the component side. • All capacitors are in µF unless otherwise noted. pF: µµF •...

  • Page 17: Printed Wiring Board - Main Board

    XR-C6120 6-2. PRINTED WIRING BOARD – MAIN Board – • Semiconductor Location Ref. No. Location Ref. No. Location D722 E-11 D723 E-11 D724 D351 I-12 D731 D352 G-13 D732 D501 D733 D551 F-12 D734 D552 F-12 D781 D-13 D553 D554...
  • Page 18 XR-C6120 6-3. SCHEMATIC DIAGRAM – MAIN Board (1/2) – • See page 29 for Waveforms. • See page 27 for IC Block Diagrams. – 19 – – 20 –...
  • Page 19 XR-C6120 6-4. SCHEMATIC DIAGRAM – MAIN Board (2/2) – • See page 28 for IC Block Diagrams. (Page 25) – 21 – – 22 –...

  • Page 20: Printed Wiring Board - Key Board

    XR-C6120 6-5. PRINTED WIRING BOARD – KEY Board – • Semiconductor Location (Component Side) Ref. No. Location D902 B-12 D903 B-12 D904 B-11 D951 IC951 B-10 Q945 (Page 17) • Semiconductor Location (Conductor Side) Ref. No. Location IC901 – 23 –...

  • Page 21: Schematic Diagram - Key Board

    XR-C6120 6-6. SCHEMATIC DIAGRAM – KEY Board – • See page 29 for Waveform. (Page 22) – 25 – – 26 –...
  • Page 22 • IC Block Diagrams IC331 TDA7462D – MAIN Board – IC21 TB2118F-EL-S SE3L SE3R MUTE PAUSE PAUSE DETECT 24 23 22 21 16 15 14 13 FRONT INPUT TREBLE/ OUT FL LOUDNESS VOLUME VOICE BANDPASS FADER GAIN & SOFT BASS CONTROL CONTROL SE1L...
  • Page 23 • Waveforms – MAIN Board – – KEY Board – 1 IC21 1 (XT OUT) 1 IC901 ^º OSC 2.7 Vp-p 0.2 Vp-p 97.6 ns 27 µ s 2 IC501 !∞ (XT IN) 1.7 Vp-p 30.5 µ s 3 IC501 !£ (OSC IN) 1.3 Vp-p 54.2 ns –...

  • Page 24: Ic Pin Function Description

    Rotary remote commander shift key input terminal “L”: shift SYSRST Reset signal output to the SONY bus interface (IC581) “L”: reset BUS-ON Bus on/off control signal output to the SONY bus interface (IC581) “L”: bus on UNISO Serial data output to the SONY bus interface (IC581) UNISI...
  • Page 25 Pin No. Pin Name Function BEEP Beep sound drive signal output terminal AMP-MUT Muting on/off control signal output to the power amplifier (IC751) “L”: muting on Standby on/off control signal output to the power amplifier (IC751) AMP ON “L”: standby mode, “H”: amp on PLL-CKO PLL serial data transfer clock signal output to the FM/AM PLL (IC21) PLL-CE...
  • Page 26 Pin No. Pin Name Function POS3 Tape position (EJECT/FF/REW/ POS3: “L”: REV and EJECT mode, “H”: others mode POS2 REV/FWD mode) detect input from POS2: “L”: REW mode, “H”: others mode the tape operation switch on the POS0: “L”: EJECT mode, “H”: others mode POS0 deck mechanism POS1: “L”: FF and FWD mode, “H”: others mode...

  • Page 27: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they may have some difference from the original are seldom required for routine service. Some one. delay should be anticipated when ordering •...
  • Page 28 (2) FRONT PANEL SECTION LCD901 not supplied (KEY board) Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-030-835-01 BUTTON (1-6) (OFF. SHIFT. 1. 2. 3. 4. 5. 6) 3-031-033-01 BUTTON (D/F/D) (6. – DISC +. FILE. DSPL) 3-030-837-01 BUTTON (D-BASS) 3-031-024-01 LENS X-3377-049-1 PANEL SUB ASSY...
  • Page 29 (3) MECHANISM DECK SECTION (MG-25F-136) HP901 M901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-3291-667-A CLUTCH (FR) ASSY 3-933-346-01 CATCHER * 152 3-019-130-01 LEVER (LDG-A) 3-933-344-01 GUIDE (C) * 153 3-019-131-01 LEVER (LDG-B) 3-014-798-01 SCREW (HEAD), SPECIAL 3-020-539-01 SPRING (LD-1), TENSION 3-364-151-01 WASHER 3-020-540-01 SPRING (LD-2), TENSION...

  • Page 30: Electrical Parts List

    SECTION 8 ELECTRICAL PARTS LIST NOTE: When indicating parts by reference • Due to standardization, replacements in the • Items marked “*” are not stocked since they number, please include the board. are seldom required for routine service. parts list may be different from the parts speci- fied in the diagrams or the components used Some delay should be anticipated when order- on the set.
  • Page 31 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-124-233-11 ELECT 10uF R951 1-216-037-00 METAL CHIP 1/10W 1-163-222-11 CERAMIC CHIP 0.25PF 50V R952 1-216-025-00 RES, CHIP 1/10W 1-163-231-11 CERAMIC CHIP 15PF R953 1-216-121-00 RES, CHIP 1/10W R954 1-216-049-11 RES, CHIP 1/10W...
  • Page 32 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C614 1-124-233-11 ELECT 10uF C209 1-163-227-11 CERAMIC CHIP 10PF 0.5PF C615 1-124-233-11 ELECT 10uF C210 1-163-227-11 CERAMIC CHIP 10PF 0.5PF C616 1-124-233-11 ELECT 10uF C211 1-163-227-11 CERAMIC CHIP 10PF 0.5PF C241...
  • Page 33 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D621 8-719-422-12 DIODE MA8039 JC121 1-216-295-00 SHORT JC151 1-216-295-00 SHORT D622 8-719-404-50 DIODE MA111-TX JC152 1-216-295-00 SHORT D623 8-719-422-12 DIODE MA8039 D624 8-719-422-97 DIODE MA8091-M JC173 1-216-296-00 SHORT D701 8-719-977-12 DIODE DTZ6.8B JC181...
  • Page 34 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q251 8-729-920-21 TRANSISTOR DTC314TKH04 R182 1-216-065-00 RES, CHIP 4.7K 1/10W Q271 8-729-920-21 TRANSISTOR DTC314TKH04 R184 1-216-129-00 METAL CHIP 2.2M 1/10W Q281 8-729-920-21 TRANSISTOR DTC314TKH04 R185 1-216-085-00 METAL CHIP 1/10W Q351 8-729-015-11 TRANSISTOR 2SD1802FAST-TL...
  • Page 35 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R527 1-216-097-00 RES, CHIP 100K 1/10W R713 1-216-025-00 RES, CHIP 1/10W R528 1-216-097-00 RES, CHIP 100K 1/10W R714 1-216-025-00 RES, CHIP 1/10W R751 1-216-049-11 RES, CHIP 1/10W R529 1-216-097-00 RES, CHIP 100K...
  • Page 36 XR-C6120 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark PARTS FOR INSTALLATION AND CONNECTIONS ************************************** 3-916-161-31 FRAME ASSY X-3370-076-1 SCREW ASSY (KEY), FITTING 3-934-325-01 SCREW, +K (5X8) TAPPING 3-924-961-01 SUPPORT (ND), FITTING 3-018-384-01 COLLAR 1-776-207-31 CORD (WITH CONNECTOR) (POWER) +T4 ×...

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