Sony XR-4800 Service Manual
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Sony XR-4800 Service Manual

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SERVICE MANUAL
AUDIO POWER SPECIFICATIONS (US model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
13 watts per channel minimum continuous average power into 4 ohms, 4
channels driven from 20 Hz to 20 kHz with no more than 1% total
harmonic distortion.
Cassette player section
Tape track
4-track 2-channel stereo
Wow and flutter
0.08% (WRMS)
Frequency response
30 – 18,000 Hz
Signal-to-noise ratio
58 dB
Tuner section
FM
Tuning range
FM tuning interval:
87.5 – 107.9 MHz
(XR-4790, XR-4800: US, Canadian model)
50 kHz/200 kHz switchable
87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)
(XR-4800: E model)
Antenna terminal
External antenna connector
Intermediate frequency
10.7 MHz
Usable sensitivity
8 dBf
Selectivity
75 dB at 400 kHz
Signal-to-noise ratio
65 dB (stereo),
68 dB (mono)
Harmonic distortion at 1 kHz
0.5% (stereo),
0.3% (mono)
Separation
35 dB at 1 kHz
Frequency response
30 – 15,000 Hz
Capture ratio
2 dB
MICROFILM
XR-4790/4800
Photo: XR-4800
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
SPECIFICATIONS
AM (MW)
Tuning range
Antenna terminal
Intermediate frequency
Sensitivity
SW (XR-4800: E model)
Tuning range
Antenna terminal
Intermediate frequency
Sensitivity
XR-4790, XR-4800: US, Canadian Model
FM/AM CASSETTE CAR STEREO
FM/MW/SW CASSETTE CAR STEREO
US Model
Canadian Model
E Model
XR-4790/4800
MG-25F-136
AM tuning interval:
530 – 1,710 kHz
(XR-4790, XR-4800: US, Canadian model)
MW tuning interval:
9 kHz/10 kHz switchable
531–1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)
(XR-4800: E model)
External antenna connector
10.71 MHz/450 kHz.
30 µV
SW tuning interval:
SW1: 2,940 – 7,735 kHz
SW2: 9,500 – 18,135 kHz
(except for 10,140 – 11,575 kHz)
External antenna connector
10.71 MHz/450 kHz
50 µV
– Continued on next page –
XR-4800: E Model
XR-4800
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Summary of Contents for Sony XR-4800

  • Page 1 13 watts per channel minimum continuous average power into 4 ohms, 4 530 – 1,710 kHz channels driven from 20 Hz to 20 kHz with no more than 1% total (XR-4790, XR-4800: US, Canadian model) harmonic distortion. MW tuning interval:...

  • Page 2: Table Of Contents

    6-3. Printed Wiring Board –PANEL Section– (XR-4790) ... 27 6-4. Schematic Diagram –PANEL Section– (XR-4790) ..29 6-5. Printed Wiring Board –PANEL Section– (XR-4800) ..31 6-6. Schematic Diagram –PANEL Section– (XR-4800) ..33 6-7. IC Pin Function Description ........... 35 EXPLODED VIEWS ..........
  • Page 3 SECTION 1 This section is extracted from instruction manual. GENERAL – 3 –...
  • Page 4 – 4 –...
  • Page 5 – 5 –...
  • Page 6 – 6 –...
  • Page 7 – 7 –...
  • Page 8 – 8 –...
  • Page 9 (E model only) – 9 –...

  • Page 10: 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 11 5 screw SUB PANEL, MECHANISM DECK (MG-25F-136) (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 × 8) 1 three screws (PTT2.6 × 8) 5 two screws (PTT 2.6 ×...

  • Page 12: Assembly Of Mechanism Deck

    SECTION 3 ASSEMBLY OF MECHANISM DECK Note: Follow the assembly procedure in the numerical order given. 5 Fit projection on C part. HOUSING 7 Holder the hanger by bending the claw. 2 Install the hanger onto two claws of the housing. 1 Install the catch to the hanger.
  • Page 13 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 14 GUIDE (C) 2 guide (C) 1 three claws – 14 –...

  • Page 15: Mechanical Adjustments

    SECTION 5 SECTION 4 ELECTRICAL ADJUSTMENTS MECHANICAL ADJUSTMENTS TEST MODE 1. Clean the following parts with a denatured-alcohol-moistene 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 16: Tuner Section

    FM Noise Focus Adjustment (4800: E model only) TUNER SECTION Setting: XR-4790 and XR-4800 US/Canadian model, a tuner section is no [SOURCE] button: FM adjustment. FREQUENCY SELECT switch: 10 k 0 dB=1 µV FM RF signal level meter antenna jack (J1)
  • Page 17 AM (MW) Auto Scan/Stop Level Adjustment Make this adjustment after “FM Auto Scan/Stop Level Adjustment”. Setting: [SOURCE] [MODE] button: MW FREQUENCY SELECT switch: 10 k 30 Ω 15 pF 65 pF AM RF signal generator AM dummy antenna (50 Ω ) antenna jack (J1) Carrier frequency : 1000 kHz 30% amplitude...
  • Page 18 Adjustment Location: – SET UPPER VIEW – Tape Speed Adjustment TU 1 RV 1 AM (MW) Auto Scan/Stop Level Adjustment RV 2 FM Auto Scan/Stop Level Adjustment RV 3 FM Noise Focus Adjustment RV 4 FM Stereo Separation Adjustment – 18 –...

  • Page 19: Diagrams

    SECTION 6 DIAGRAMS • IC Block Diagrams – MAIN Board – IC301 CXA2509AQ-T4 IC351 MM1322XFBE 8 OUT2 24dB 120µ/70µ + – MSMODE – NR BIAS DRSW PBFB2 MODE PBRIN2 TAPE/AUX OUT1 TAPESW PBREF2 INSW TAPE EQ PBFIN2 FWD/RVS PBGND MS ON/ DETECT –...
  • Page 20 IC611 BA3918-V2 REGULATOR OVER VOLTAGE PROTECT – 2 3 4 – 20 –...

  • Page 25: 6-7. Ic Pin Function Description

    XR-4790: 6, INTRO 1, REPEAT 2, 3, BL SKIP 6, ATA 5, 4, PRST +/– keys input (LSW921 to LSW927, LSW929 and LSW930) KEYIN1 XR-4800: 6, INTRO 1, REPEAT 2, 3, BL SKIP 6, ATA 5, 4 keys input (LSW921 to LSW927) Key input terminal (A/D input) XR-4790: OFF, SOURCE, MODE *, + ) + SEEK AMS, –...
  • Page 26 Setting terminal for the test (fixed at “L”) Not used (open) SEKOUT Seek control signal output to the FM/AM tuner unit (TU1) Used for the XR-4800; E model MW/SW selection signal output terminal “H”: MW, “L”: SW MW SW Used for the XR-4800; E model...
  • Page 27 Function Active selection terminal for the SEKOUT (pin #•) SEKOUTSEL XR-4800; E model: fixed at “L”, XR-4790, XR-4800; US, Canadian models: fixed at “H” COLORSEL Setting terminal for the illumination color “L”: amber, “H”: green Not used (fixed at “L”)

  • Page 28: Exploded Views

    1-776-207-31 CORD (WITH CONNECTOR) (POWER) 3-935-003-01 SPRING, TORSION (XR-4800: US, Canadian) 3-932-205-41 DOOR, CASSETTE (XR-4800: E) 1-776-207-81 CORD (WITH CONNECTOR) (POWER) 3-932-205-61 DOOR, CASSETTE (EXCEPT XR-4800: E) (XR-4790, XR-4800: E) X-3367-636-1 LOCK ASSY * 10 3-009-809-01 BRACKET (IC) * 11...
  • Page 29 (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 30 (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) 3-016-927-01 BUTTON (1-3) (6. 1. 2. 3) 3-015-036-01 CUSHION (BACK PANEL) 3-016-928-11 BUTTON (4-6) (4. 5. 6) 3-016-924-01 BUTTON (L) (2) (+.
  • Page 31 (4) 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) 3-014-798-01 SCREW (HEAD), SPECIAL * 153 3-019-131-01 LEVER (LDG-B) 3-020-539-01 SPRING (LD-1), TENSION 3-364-151-01 WASHER 3-020-540-01 SPRING (LD-2), TENSION...

  • Page 32: Electrical Parts List

    LSW905 1-762-619-11 SWITCH, KEY BOARD (WITH LED)(= 0 –) 3-018-611-01 HOLDER (LCD)(XR-4800) LSW906 1-762-619-11 SWITCH, KEY BOARD (WITH LED)(–) 3-018-612-01 PLATE, LIGHT GUIDE (XR-4800) LSW907 1-762-619-11 SWITCH, KEY BOARD (WITH LED)(SEL) 3-019-149-01 PLATE, LCD (XR-4800) LSW908 1-762-619-11 SWITCH, KEY BOARD (WITH LED)(+)
  • Page 33 0.15uF A-3313-384-A MAIN BOARD, COMPLETE C168 1-126-157-11 ELECT 10uF (XR-4800: US, Canadian) C169 1-163-227-11 CERAMIC CHIP 10PF 0.5PF A-3313-385-A MAIN BOARD, COMPLETE (XR-4800: E) C170 1-163-157-00 CERAMIC CHIP 10PF C171 1-126-163-11 ELECT 4.7uF ********************* 3-009-809-01 BRACKET (IC) C172 1-163-009-11 CERAMIC CHIP 0.001uF...
  • Page 34 8-719-404-49 DIODE MA111 C554 1-164-004-11 CERAMIC CHIP 0.1uF D501 8-719-400-20 DIODE MA152WA C571 1-126-163-11 ELECT 4.7uF D502 8-719-911-19 DIODE 1SS119 (XR-4790, XR-4800: E) D551 8-719-400-20 DIODE MA152WA C582 1-163-009-11 CERAMIC CHIP 0.001uF D552 8-719-404-49 DIODE MA111 C602 1-164-222-11 CERAMIC CHIP 0.22uF...
  • Page 35 8-719-970-02 DIODE 1SR139-400 < COIL > D783 8-719-970-02 DIODE 1SR139-400 D784 8-719-422-64 DIODE MA8062-M L501 1-410-509-11 INDUCTOR 10uH D785 8-719-035-74 DIODE MA4062-M(TA)(XR-4790, XR-4800: E) L781 1-411-669-12 COIL, CHOKE L901 1-410-509-11 INDUCTOR 10uH < IC > < TRANSISTOR > IC301 8-752-079-78 IC CXA2509AQ-T4...
  • Page 36 R304 1-216-077-00 METAL CHIP 1/10W 1-249-421-11 CARBON 2.2K 1/4W R305 1-249-429-11 CARBON 1/4W 1-216-049-11 RES, CHIP 1.0K (2012) (XR-4790, XR-4800: US, Canadian) R306 1-249-429-11 CARBON 1/4W R103 1-216-041-00 METAL CHIP 1/10W R307 1-216-073-00 METAL CHIP 1/10W R104 1-216-109-00 METAL CHIP...
  • Page 37 (XR-4800: E) R534 1-216-097-00 RES, CHIP 100K (2012) < TUNER > R535 1-216-097-00 RES, CHIP 100K (2012) A-3282-019-A TUNER UNIT TUX-008 (EA)(XR-4800: E) R536 1-216-246-00 RES, CHIP 100K (3216) A-3282-034-A TUNER UNIT TUX-010 (E) R537 1-216-246-00 RES, CHIP 100K (3216)
  • Page 38 Description Remark PARTS FOR INSTALLATION AND CONNECTIONS ************************************** 3-916-161-31 FRAME ASSY X-3370-077-1 SCREW ASSY (AE. KEY), FITTING (XR-4790, XR-4800: E) 3-924-961-01 SUPPORT (ND), FITTING (XR-4800: US, Canadian) X-3370-076-1 SCREW ASSY (KEY), FITTING (XR-4800: US, Canadian) X-3371-913-1 SCREW ASSY (J) 3-018-384-01 COLLAR...

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