Sony ICF-CD855V Service Manual

Sony ICF-CD855V Service Manual

Tv/weather/fm/am cd clock radio
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SERVICE MANUAL
Ver 1.0 2004.02
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION
With 8–ohm loads, both channels driven from
100 – 10 000 Hz; rated 1.0 W per channel-minimum
RMS power, with no more than 10% total harmonic
distortion in AC operation.
CD player section
System: Compact disc digital audio system
Laser diode properties:
Material: GaAlAs
Wavelength: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 µW
(This output is the value measured at a distance of
about 200 mm from the objective lens surface on
the optical pick-up block with 7 mm aperture.)
Frequency response: 20-20 000 Hz
Wow and flutter: Below measurable limit
Sony Corporation
9-877-569-01
2004B05-1
Personal Audio Company
C 2004.02
Published by Sony Engineering Corporation
ICF-CD855V
Model Name Using Similar Mechanism
Optical Pick-up Block Name
Optical Pick-up Name
SPECIFICATIONS
Radio section
Frequency range:
TV:
WEATHER: 1 – 7 ch
FM:
AM:
General
Time display: 12-hour system
Speaker: 50 mm (2 inches) dia., 8 Ω
Outputs: i (headphones) jack (ø 3.5 mm
stereo minijack)
Power outputs:
1 W + 1 W (at 10% harmonic distortion)
Power requirements: 120 V AC, 60 Hz
Dimensions:
Approx. 169 × 165 × 217 mm (w/h/d)
(Approx. 6
3
/
4
+1
dB
projecting parts and controls
–1.5
Mass: Approx. 1 700 g (3 lb 12 oz)
Design and specifications are subject to change
without notice.
TV/WEATHER/FM/AM CD CLOCK RADIO
2 – 13 ch
87.5 – 108 MHz
530 – 1 710 kHz
× 6
× 8
1
/
5
/
inches) incl.
2
8
US Model
ICF-CD73V
KSM-900AAA
KSS-900A

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Summary of Contents for Sony ICF-CD855V

  • Page 1 Wow and flutter: Below measurable limit Mass: Approx. 1 700 g (3 lb 12 oz) Design and specifications are subject to change without notice. TV/WEATHER/FM/AM CD CLOCK RADIO Sony Corporation 9-877-569-01 2004B05-1 Personal Audio Company C 2004.02 Published by Sony Engineering Corporation...
  • Page 2 LINE WITH MARK 0 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 PUB- LISHED BY SONY.
  • Page 3: Table Of Contents

    ICF-CD855V SECTION 1 SERVICING NOTES TABLE OF CONTENTS NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT SERVICING NOTES ..........The laser diode in the optical pick-up block may suffer electro- static break-down because of the potential difference generated GENERAL ..............
  • Page 4: General

    ICF-CD855V SECTION 2 This section is extracted from GENERAL instruction manual. C Setting the Buzzer Alarm Setting the Alarm Perform steps 1 to 5 in “To set the Alarm This clock radio is equipped with 3 alarm modes— Time.” CD, radio and buzzer. Before setting the alarm, make...
  • Page 5: Disassembly

    ICF-CD855V SECTION 3 DISASSEMBLY • This set can be disassembled in the order shown below. 3-1. DISASSEMBLY FLOW 3-2. CABINET (REAR) BLOCK (Page 5) 3-3. CABINET (UPPER) BLOCK 3-9. CD LID BLOCK (Page 6) (Page 9) 3-7. MAIN BOARD 3-4. CD BOARD...
  • Page 6: Cabinet (Upper) Block

    ICF-CD855V 3-3. CABINET (UPPER) BLOCK 6 four screws (B2.6) 1 sheet 5 connector (CNP601) 2 flexible flat cable (CNP303) 3 sheet 4 connector (CNP602) 9 cabinet (upper) block 8 three claws 8 three claws 7 three screws (B2.6) 3-4. CD BOARD...
  • Page 7: Optical Pick-Up Block (Ksm-900Aaa)

    ICF-CD855V 3-5. OPTICAL PICK-UP BLOCK (KSM-900AAA) 1 screw 7 optical pick-up block 5 connector (B2.6) (KSM-900AAA) 6 insulator (CNP706) 2 two screws (B2.6) RELAY board 3 chassis (CD) 6 two insulators 4 flexible board (CNP705) 3-6. OPTICAL PICK-UP (KSS-900A) 4 screw (B1.7 ×...
  • Page 8: Main Board

    ICF-CD855V 3-7. MAIN BOARD 4 connector (CNP304) 5 three screws (B2.6) 3 connector (CNP2) qs MAIN board 9 power unit 2 TUNER board 1 four screws (B2.6) 6 two screws (B2.6) qa SIDE board q; Remove four solders. 8 Remove two solders.
  • Page 9: Speaker (Sp101/Sp201)

    ICF-CD855V 3-8. SPEAKER (SP101/SP201) 3 screw (B2.6) 5 screw (B2.6) 4 bracket (C) L 6 bracket (B) L 1 six screws (B2.6) 7 screw (B2.6) 2 cover (SP) 8 bracket (A) L 9 speaker (SP101) 9 speaker 8 bracket (A) R (SP201) 7 screw (B2.6)
  • Page 10: Test Mode

    ICF-CD855V SECTION 4 TEST MODE LCD, LED AND KEY TEST MODE Procedure: 1. Turn the power on while pressing simultaneously three but- [RADIO ON/BAND] [CLOCK] [MODE] tons of , and 2. The microcomputer version will be displayed on the LCD.
  • Page 11 ICF-CD855V CD TEST MODE Procedure: 1. Connect 22 kΩ and 100 kΩ resistors in parallel to the end of S618 on the LCD board, and short another end of resistors to the GND, and the CD TEST MODE will be activated.
  • Page 12 ICF-CD855V CD-JUMP TEST MODE Procedure: 1. Connect the oscilloscope to TP (TE) and TP (VREF) on the CD board. Connecting Location: CD board (See page 15) 2. Connect 22 kΩ and 100 kΩ resistors in parallel to the end of S618 on the LCD board, and further connect 47 kΩ and 47 kΩ resistors respectively and short them to the GND, and the CD-JUMP TEST MODE will be activated.
  • Page 13: Electrical Adjustments

    ICF-CD855V SECTION 5 ELECTRICAL ADJUSTMENTS 0 dB=1 µV AM IF ADJUSTMENT TUNER SECTION Adjust for a maximum reading on level meter [AM] 450 kHz Setting: Function: RADIO AM VCO VOLTAGE ADJUSTMENT Band: AM Adjustment Part Frequency Display Reading on Digital Voltmeter 1.0 ±...
  • Page 14 ICF-CD855V Adjustment and Connecting Location: – TUNER BOARD (Component Side) – FM/TV/WEATHER IF Adjustment TV (7 – 13 CH)/ WEATHER VCO Voltage Adjustment AM IF Adjustment TV (7 – 13 CH)/ FM/TV (2 – 6 CH) WEATHER VCO Voltage Adjustment Tracking Adjustment FM/TV (2 –...
  • Page 15 ICF-CD855V CD SECTION Perform all CD section check in the test mode. FOCUS BIAS CHECK Procedure: 1. Connect the oscilloscope to TP (RF) and TP (VREF) on the CD board. 2. Insert the test disc (YEDS-18). (Part No. 3-702-101-01) (CD) 3.
  • Page 16: Diagrams

    ICF-CD855V SECTION 6 DIAGRAMS 6-1. BLOCK DIAGRAM – CD Section – RF AMP, FOCUS/TRACKING SERVO, DIGITAL SIGNAL PROCESSOR, CLV SERVO, FIN2 DIGITAL FILTER, D/A CONVERTER IC701 DETECTOR INTERPOLATION LCHO CD L-OUT ERROR MUTE EFMIN SLISE LEVEL 1 BIT FIN1 CORRECTION...
  • Page 17: Block Diagram - Tuner Section

    ICF-CD855V 6-2. BLOCK DIAGRAM – TUNER Section – FM IFT FM IF ANT1 FM/TV/WEATHER LEAD WIRE ANTENNA FM/AM RF AMP, MIX, OSC, FM/AM IF AMP, DET, MPX L-OUT TU L-OUT IF IN RF IN MIX OUT B.P.F. FM IF BPF1...
  • Page 18: Block Diagram - Main Section

    ICF-CD855V 6-3. BLOCK DIAGRAM – MAIN Section – POWER AMP L-OUT IC302 (Page 16) CD LIN SEL1 VIN1 LOUT INPUT VOLUME SURROUND TONE POWER L-OUT R LIN SP101 (Page 17) SELECT CONTROL CONTROL CONTROL (L-CH) INPUT SELECT, LOGIC R-CH SP201...
  • Page 19: Note For Printed Wiring Boards And Schematic Diagrams

    ICF-CD855V 6-4. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS • Circuit Boards Location Note on Printed Wiring Boards: Note on Schematic Diagram: • All capacitors are in µF unless otherwise noted. pF: µµF • X : parts extracted from the component side.
  • Page 20: Printed Wiring Boards - Cd Section

    ICF-CD855V 6-5. PRINTED WIRING BOARDS – CD Section – • :Uses unleaded solder. See page 19 for Circuit Boards Location. CD BOARD M701 (SLED) R707 Q701 S701 (LIMIT) C701 C702 R729 R728 R710 ON : WHEN THE OPTICAL PICK-UP R709...
  • Page 21: Schematic Diagram - Cd Section

    ICF-CD855V 6-6. SCHEMATIC DIAGRAM – CD Section – • See page 28 for Waveforms. • See page 28 for IC Block Diagrams. CNP706 CNP704 M701 (SLED) S701 (LIMIT) ON:WHEN THE OPTICAL PICK-UP IS INNER POSITION M702 (SPINDLE) CNP705 C726 1000p...
  • Page 22: Printed Wiring Board - Tuner Board

    ICF-CD855V 6-7. PRINTED WIRING BOARD – TUNER Board – • :Uses unleaded solder. See page 19 for Circuit Boards Location. • Semiconductor Location Ref. No. Location TUNER BOARD B-10 B-10 (SHIELD CASE) ANT1 FM/TV/WEATHER (VT) LEAD WIRE ANTENNA (GND) (ANT)
  • Page 23: Schematic Diagram - Tuner Board

    ICF-CD855V 6-8. SCHEMATIC DIAGRAM – TUNER Board – • • See page 28 for Waveform. See page 28 for IC Block Diagrams. KV1520NT 220p AM OSC (GND) 100p AM FERRITE-ROD JW12 ANTENNA JW22 100k 3.3k JW23 KDS121 0.01 220k 0.047...
  • Page 24: Printed Wiring Boards - Panel Section

    ICF-CD855V 6-9. PRINTED WIRING BOARDS – PANEL Section – • See page 19 for Circuit Boards Location. :Uses unleaded solder. • Semiconductor Location KEY-B BOARD Ref. No. Location D601 D602 S613 D603 D604 J-12 W605 TUNE D605 J-12 TIME SET –...
  • Page 25: Printed Wiring Board - Main Section

    ICF-CD855V 6-10. PRINTED WIRING BOARD – MAIN Section – • :Uses unleaded solder. See page 19 for Circuit Boards Location. • Semiconductor Location Ref. No. Location LCD BOARD LCD BOARD D101 CNP606 CNP607 D102 (Page 24) (Page 24) MAIN BOARD...
  • Page 26: Schematic Diagram - Main Section (1/2)

    ICF-CD855V 6-11. SCHEMATIC DIAGRAM – MAIN Section (1/2) – • See page 28 for Waveforms. • See page 32 for IC Pin Function Description. Q609-612 LED DRIVE ALARM A BUZZER RADIO R601 C611 R603 C612 R605 C613 Q609 Q610 Q611...
  • Page 27: Schematic Diagram - Main Section (2/2)

    ICF-CD855V 6-12. SCHEMATIC DIAGRAM – MAIN Section (2/2) – • See page 28 for IC Block Diagrams. (2/2) CNP901 Q908 KTC3203Y C918 +3.3V 0.01 (CHASSIS GND) REGULATOR Q909 MUN5113T1 REGULATOR Q903 POWER CONTROL 2SD2396K W901 UNIT +5.6V R496 REGULATOR 470k...
  • Page 28 ICF-CD855V • Waveforms • IC Block Diagrams – CD Board – – MAIN Board – – CD Board – – TUNER Board – 1 IC701 4 (RF) (CD play mode) qa IC2 w; (XOUT) wa IC401 ua (XT2) IC701 LC78646E-E...
  • Page 29 ICF-CD855V IC702 BA5826FP-E2 SP– D.BUFF SL– D.BUFF LEVEL D.BUFF SHIFT D.BUFF SPIN LEVEL SHIFT SLIN THERMAL SHUT-DOWN MONITOR (SLIN) REG–B VREF REGO MUTE (FIN) DRIVER MUTE (TIN) LEVEL LEVEL SHIFT D.BUFF SHIFT D.BUFF F– T– D.BUFF D.BUFF OPOUT OPIN – TUNER Board –...
  • Page 30 ICF-CD855V IC2 LC72137M-TLM-E XOUT REFERENCE DIVIDER AOUT PHASE 12BITS DETECTOR PROGRAMMABLE CHARGE DIVIDER PUMP UNLOCK DETECTOR POWER ON RESET SWALLOW COUNTER FMIN 1/16,1/17 4BITS UNIVERSAL COUNTER AMIN IFIN...
  • Page 31 ICF-CD855V – MAIN Board – IC301 BD3870FS-E2 IC302 LA4627 11 10 POP SOUND RIPPLE PROTECTION FILTER BLOCK POWER – PROTECTOR POWER STANDBY SWITCH...
  • Page 32 ICF-CD855V • IC Pin Function Description MAIN BOARD IC401 µPD789477GC-A39-8BT (SYSTEM CONTROLLER) Pin No. Pin Name Description 1, 2 — Not used 3 to 5 VLC2 to VLC0 — Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage...
  • Page 33: Exploded Views

    ICF-CD855V SECTION 7 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark 0 are may have some difference from the original are seldom required for routine service.
  • Page 34: Cabinet (Rear) Block Section

    ICF-CD855V 7-2. CABINET (REAR) BLOCK SECTION cd lid section not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-254-081-01 SCREW X-3384-707-1 CABINET (REAR) SUB ASSY (WHITE) 3-840-486-12 CUSHION, SPEAKER 3-262-670-01 BUTTON (SIDE) (VOL + -. MODE) (SILVER) 3-266-566-01 SHEET (REAR) 3-262-670-11 BUTTON (SIDE) (VOL + -.
  • Page 35: Cd Lid Section

    ICF-CD855V 7-3. CD LID SECTION not supplied lcd section Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-262-662-01 LID (LOWER), CD (SILVER) 3-262-676-01 GEAR (ARM) (SILVER) 3-262-662-11 LID (LOWER), CD (WHITE) 3-262-676-11 GEAR (ARM) (WHITE) 3-262-698-01 SPRING (CD LID)
  • Page 36: Lcd Section

    ICF-CD855V 7-4. LCD SECTION LCD601 D610 D609 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-262-683-01 CASE (LCD), SHIELD D609 6-500-915-01 LED SLP-WH118A-51-SW (LCD BACK LIGHT) 3-267-408-01 ILLUMINATOR D610 6-500-915-01 LED SLP-WH118A-51-SW (LCD BACK LIGHT) 3-262-678-01 HOLDER (LCD)
  • Page 37: Cabinet (Upper) Section

    ICF-CD855V 7-5. CABINET (UPPER) SECTION not supplied (RELAY board) KEY board section optical pick-up section (KSM-900AAA) Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-254-151-01 SCREW (B2.6), (+) P TAPPING 1-829-090-11 CABLE, FLEXIBLE FLAT (14 CORE)
  • Page 38: Key Board Section

    ICF-CD855V 7-6. KEY BOARD SECTION Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-2021-197-1 BUTTON (SNOOZE) SUB ASSY (SILVER) * 258 A-4542-919-A KEY-B BOARD, COMPLETE X-2021-198-1 BUTTON (SNOOZE) SUB ASSY (WHITE) 3-262-680-01 INDICATOR (ALARM) B 3-262-674-01 BUTTON (OPEN) (Z) (SILVER)
  • Page 39: Cabinet (Lower) Block Section

    ICF-CD855V 7-7. CABINET (LOWER) BLOCK SECTION not supplied (SWITCH board) not supplied ANT1 speaker section The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Ref. No. Part No.
  • Page 40: Speaker Section

    ICF-CD855V 7-8. SPEAKER SECTION not supplied supplied not supplied SP101 not supplied SP201 not supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-265-480-01 SHEET (A) X-2021-192-1 CABINET (LOWER) SUB ASSY (SILVER) X-2021-193-1 CABINET (LOWER) SUB ASSY (WHITE)
  • Page 41: Optical Pick-Up Section (Ksm-900Aaa)

    ICF-CD855V 7-9. OPTICAL PICK-UP SECTION (KSM-900AAA) (including M701, M702) not supplied The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Ref. No. Part No. Description Remark Ref. No.
  • Page 42: Electrical Parts List

    ICF-CD855V SECTION 8 ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark parts list may be different from the parts speci- are seldom required for routine service.
  • Page 43 ICF-CD855V KEY-A KEY-B Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R716 1-216-821-11 METAL CHIP 1/10W R608 1-216-853-11 METAL CHIP 470K 1/10W R717 1-216-821-11 METAL CHIP 1/10W R609 1-216-849-11 METAL CHIP 220K 1/10W R718 1-216-821-11 METAL CHIP...
  • Page 44 ICF-CD855V KEY-B MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R634 1-216-841-11 METAL CHIP 1/10W A-4542-928-A MAIN BOARD, COMPLETE R635 1-216-841-11 METAL CHIP 1/10W ********************* R636 1-216-821-11 METAL CHIP 1/10W R638 1-216-821-11 METAL CHIP 1/10W 3-253-143-01 SCREW (B2.6), (+) P TAPPING...
  • Page 45 ICF-CD855V MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C327 1-126-947-11 ELECT 47uF C401 1-115-156-11 CERAMIC CHIP C914 1-162-970-11 CERAMIC CHIP 0.01uF C402 1-115-156-11 CERAMIC CHIP C915 1-162-970-11 CERAMIC CHIP 0.01uF C917 1-162-970-11 CERAMIC CHIP 0.01uF...
  • Page 46 ICF-CD855V MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q401 6-550-607-01 TRANSISTOR MUN5113T1 R403 1-216-845-11 METAL CHIP 100K 1/10W Q402 8-729-030-53 TRANSISTOR MSD1819A-RT1 R405 1-216-845-11 METAL CHIP 100K 1/10W Q903 8-729-021-82 TRANSISTOR 2SD2396K R407 1-216-829-11 METAL CHIP 4.7K...
  • Page 47 ICF-CD855V MAIN RELAY SIDE SNOOZE SWITCH TUNER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark SWITCH BOARD R913 1-216-829-11 METAL CHIP 4.7K 1/10W ************* R914 1-216-825-11 METAL CHIP 2.2K 1/10W R915 1-216-809-11 METAL CHIP 1/10W < SWITCH >...
  • Page 48 ICF-CD855V TUNER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-162-927-11 CERAMIC CHIP 100PF 1-162-927-11 CERAMIC CHIP 100PF < FERRITE BEAD > 1-162-927-11 CERAMIC CHIP 100PF 1-469-701-21 FERRITE, EMI (SMD) (1608) 1-162-927-11 CERAMIC CHIP 100PF 1-469-701-21 FERRITE, EMI (SMD) (1608)
  • Page 49 ICF-CD855V TUNER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-833-11 METAL CHIP 1/10W 1-216-864-11 SHORT CHIP SP101 1-825-679-11 SPEAKER (5.0cm) 1-216-817-11 METAL CHIP 1/10W SP201 1-825-679-11 SPEAKER (5.0cm) ************************************************************ 1-216-835-11 METAL CHIP 1/10W 1-216-864-11 SHORT CHIP...
  • Page 50 ICF-CD855V 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...

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