Sony XR-4790 Service Manual
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Sony XR-4790 Service Manual

Sony XR-4790 Service Manual

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XR-4790/4800
SERVICE MANUAL
AEP Model
UK Model
Photo: XR-4800
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MG-25G-136
SPECIFICATIONS
FM/MW/LW CASSETTE CAR STEREO
MICROFILM

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Summary of Contents for Sony XR-4790

  • Page 1 XR-4790/4800 SERVICE MANUAL AEP Model UK Model Photo: XR-4800 Model Name Using Similar Mechanism Tape Transport Mechanism Type MG-25G-136 SPECIFICATIONS FM/MW/LW CASSETTE CAR STEREO MICROFILM...

  • Page 2: Table Of Contents

    6-1. Printed Wiring Boards –Main Section– ......20 6-2. Schematic Diagram –Main Section– ......23 6-3. Printed Wiring Board –Panel Section– (XR-4790) ..28 6-4. Schematic Diagram –Panel Section– (XR-4790) ..31 6-5. Printed Wiring Board –Panel Section– (XR-4800) ..33 6-6.
  • Page 3 SECTION 1 This section is extracted from instruction manual. GENERAL (XR-4790) – 3 –...
  • Page 4 (XR-4800) – 4 –...
  • Page 5 – 5 –...
  • Page 6 – 6 –...
  • Page 7 – 7 –...

  • Page 8: Disassembly

    SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. FRONT PANEL ASS’Y 1 Push the button (release). 2 Remove the front panel ass'y to the direction of the arrow A . COVER ASS’Y 3 cover ass'y –...
  • Page 9 SUB PANEL, MECHANISM DECK (MG-25G-136) 5 screw (PTT2.6 × 6) 3 connector (CN351) 6 mechanism deck (MG-25G-136) 4 flexible flat cable (CN301) 2 sub panel 1 three screws (PTT2.6 × 8) 1 three screws (PTT2.6 × 8) MAIN BOARD, HEAT SINK 1 screw (PTT2.6 ×...

  • Page 10: Assembly Of Mechanism Deck

    SECTION 3 ASSEMBLY OF MECHANISM DECK Note: Follow the assembly procedure in the numerical order given. HOUSING 7 Holder the hanger by bending the claw. 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 – 12 –...

  • Page 13: Mechanical Adjustments

    SECTION 5 SECTION 4 ELECTRICAL ADJUSTMENTS MECHANICAL ADJUSTMENTS TEST MODE 1. Clean the following parts with a denatured-alcohol-moistened swab: This set have the test mode function. In the test mode, FM Auto playback head pinch roller Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments rubber belt capstan can be performed easier than it in ordinary procedure.

  • Page 14: Tuner Section

    FM Noise Focus Adjustment TUNER SECTION 0 dB=1 µV Setting: [SOURCE] button: FM Cautions during repair When the tuner unit is defective, replace it by a new one be- FM RF signal level meter antenna jack (J1) cause its internal block is difficult to repair. generator 0.01 µ...
  • Page 15 AM (MW) Auto Scan/Stop Level Adjustment Make this adjustment after "FM Auto Scan/Stop Level Adjustment". Setting: [SOURCE] [MODE] button: MW 30 Ω 15 pF 65 pF AM RF signal generator AM dummy antenna (50 Ω ) antenna jack (J1) Carrier frequency : 999 kHz 30% amplitude modulation by 1 kHz signal...
  • Page 16 Adjustment Location: —SET UPPER VIEW– Tape Speed Adjustment RV1 AM (MW) Auto Scan/Stop Level Adjustment RV2 FM Auto Scan/Stop Level Adjustment RV3 FM Noise Focus Adjustment RV4 FM Stereo Separation Adjustment – 16 –...

  • Page 17: Diagrams

    SECTION 6 DIAGRAMS • IC Block Diagrams – MAIN Section – IC301 CXA2509AQ-T4 IC361 MM1322XFBE 8 OUT2 24dB 120µ/70µ + – MSMODE – NR BIAS DRSW PBFB2 MODE PBRIN2 OUT1 TAPE/AUX TAPESW PBREF2 INSW TAPE EQ PBFIN2 FWD/RVS PBGND MS ON/ DETECT –...
  • Page 18 IC601 BA3918-V2 REGULATOR OVER VOLTAGE PROTECT – 2 3 4 – 18 –...
  • Page 19 • Waveform – MAIN Section – 1 IC501 &¶ 4.6 Vp-p 220 ns – 19 –...

  • Page 24: 6-7. Ic Pin Function Description

    XR-4800: 6, INTRO 1, REPEAT 2, 3, BL SKIP 6, ATA 5, MTL 4 keys input (LSW921 to LSW927) Key input terminal (A/D input) XR-4790: OFF, SOURCE, MODE *, + ) + SEEK AMS, – = 0 SEEK AMS, VOLUME –, SEL, VOLUME +, ATT , DSPL, BTM, LCL keys input (LSW901 to LSW912) KEYIN0 XR-4800: OFF, SOURCE, MODE *, + ) + SEEK AMS, –...
  • Page 25 At manual mode: METAL on/off control signal output “H”: METAL on MTLSEL At auto mode: input at MTLIN (pin %ª) XR-4790: Not used this function in this set (fixed at “H”) XR-4800: Used for the this function Dolby control in/out terminal At initial mode: valid/invalid selection input of dolby function (“L”...
  • Page 26 Pin No. Pin Name Function LCDCKO Serial data transfer clock signal output to the liquid crystal display driver (IC901) LCDSO Serial data output to the liquid crystal display driver (IC901) Blank indicate control signal output to the liquid crystal display driver (IC901) LCDINH “L”: no display UNICKI...

  • Page 27: Exploded Views

    3-016-595-01 INSULATOR * 14 X-3373-269-1 COVER ASSY (ISO) A-3313-351-A MAIN BOARD, COMPLETE (XR-4800) 1-782-093-11 CORD (WITH CONNECTOR) (ISO-S) A-3313-360-A MAIN BOARD, COMPLETE (XR-4790) (SPEAKER) 3-009-816-01 BRACKET (IC) (ISO) 1-782-092-11 CORD (WITH CONNECTOR) (ISO-P) (POWER) A-3309-913-A CONNECTOR BOARD, COMPLETE * 17...
  • Page 28 (2) FRONT PANEL SECTION (XR-4790) not supplied (KEY board) LCD901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-018-930-01 KNOB (D-BASS) 3-010-387-01 BUTTON (PRESET) * 52 3-014-857-01 SHEET (LCD) (T) (6. 1. 2. 3. 4. 5. 6. DSPL) 3-010-398-01 BUTTON (RELEASE) 3-010-392-01 BUTTON (L.
  • Page 29 (3) FRONT PANEL SECTION (XR-4800) not supplied (KEY board) LCD901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-018-799-01 BUTTON (D-BASS) 3-014-602-11 SPACER (A) 3-015-036-01 CUSHION (BACK PANEL) 3-016-927-01 BUTTON (1-3) (6. 1. 2. 3) 3-016-924-01 BUTTON (L) (2) (+. –) 3-016-928-11 BUTTON (4-6) (4.
  • Page 30 (4) MECHANISM DECK SECTION (MG-25G-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 31: Electrical Parts List

    3-010-375-01 SHEET (REFLECTOR) (XR-4790) LSW901 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (OFF) 3-014-857-01 SHEET (LCD) (T) (XR-4790) (GREEN) 3-018-385-01 PLATE (LCD), LIGHT GUIDE (XR-4790) LSW902 1-762-617-11 SWITCH, KEY BOARD (WITH LED) (SOURCE) 3-018-386-01 HOLDER (LCD) (XR-4790) (AMBER) 3-018-611-01 HOLDER (LCD) (XR-4800)
  • Page 32 (AMBER) LSW908 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (+) LSW929 1-762-617-11 SWITCH, KEY BOARD (WITH LED) (GREEN) (PRST +) (XR-4790: AMBER) LSW929 1-762-619-11 SWITCH, KEY BOARD (WITH LED) LSW909 1-762-617-11 SWITCH, KEY BOARD (WITH LED) (ATT) (PRST +) (XR-4790: GREEN)
  • Page 33 1-163-263-11 CERAMIC CHIP 330PF ************************************************************ C204 1-164-232-11 CERAMIC CHIP 0.01uF A-3313-351-A MAIN BOARD, COMPLETE (XR-4800) C205 1-164-489-11 CERAMIC CHIP 0.22uF A-3313-360-A MAIN BOARD, COMPLETE (XR-4790) C206 1-163-227-11 CERAMIC CHIP 10PF 0.5PF ********************* (Including CONNECTOR BOARD, COMPLETE) C207 1-126-163-11 ELECT 4.7uF...
  • Page 34 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C266 1-164-492-11 CERAMIC CHIP 0.15uF < CONNECTOR > C267 1-164-492-11 CERAMIC CHIP 0.15uF C268 1-126-157-11 ELECT 10uF CN301 1-766-260-11 CONNECTOR, FFC/FPC (ZIF) 7P C271 1-126-163-11 ELECT 4.7uF * CN351 1-506-995-11 PIN, CONNECTOR (PC BOARD) 13P C281...
  • Page 35 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < SHORT > 1-249-421-11 CARBON 2.2K 1/4W 1-216-065-00 METAL CHIP 4.7K 1/10W 1-216-295-11 SHORT (CHIP) 0 1-216-029-00 METAL CHIP 1/10W 1-216-295-11 SHORT (CHIP) 0 1-216-073-00 METAL CHIP 1/10W 1-216-295-11 SHORT (CHIP) 0 R101...
  • Page 36 R525 1-216-097-00 RES, CHIP 100K (2012) R527 1-216-097-00 RES, CHIP 100K (2012) 1-693-373-11 TUNER UNIT (FM/AM) R528 1-216-097-00 RES, CHIP 100K (2012) (XR-4790) < VIBRATOR > R529 1-216-097-00 RES, CHIP 100K (2012) R530 1-216-097-00 RES, CHIP 100K (2012) X501 1-578-785-11 VIBRATOR, CRYSTAL (4.5MHz)
  • Page 37 (XR-4800: AEP) 3-861-511-31 MANUAL, INSTRUCTION, INSTALL (POLISH, CZECH, GREEK, TURKISH, ENGLISH) (XR-4800: South European) 3-861-514-11 MANUAL, INSTRUCTION (ENGLISH, SPANISH, SWEDISH, PORTUGUESE) (XR-4790: AEP, UK) 3-861-514-21 MANUAL, INSTRUCTION (FRENCH, GERMAN, DUTCH, ITALIAN) (XR-4790: AEP) 3-861-514-31 MANUAL, INSTRUCTION (POLISH, CZECH, GREEK, TURKISH, ENGLISH)

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