Kenwood LD-K300V Video-CD LD Player
SERVICE MANUAL
Model: LD-K300V
Document Reference: 1997-8/B51-5333-00 (K) 2337
Front Panel Overview
The front panel of the LD-K300V features various connectors and controls:
- Indicator: (B12-0316-04)
- Miniature phone jack: (E11-0200-05)
- Escutcheon: (B07-2359-12)
- Panel: (A19-0865-01)
- Dressing panel: (A21-1966-03)
- Knob: (K29-6689-02)
- Panel: (A60-1155-11)
- Controls: ON/STANDBY, MIC LEVEL, MIC1, MIC2, MIC CONTROL, VIDEO CD LD PLAYER LD-K300V branding, AUTO PAUSE OPEN, AUTO, AUDIO DIGITAL MONITOR, PREVIOUS, NEXT, KEY CONTROL, KARAOKE, ECHO LEVEL, POWER ON/OFF.
- Rear Panel Connectors: Phono jacks (E11-0366-05, E63-0130-05, E63-0122-05, E63-0116-05), Foot (J02-1188-03), VIDEO OUTPUT (2/R, 1/L), AUDIO OUTPUT, Dolby AC-3 RF OUT, SYSTEM CONTROL.
- Other Rear Panel Components: Power cord bushing (J42-0083-05), Miniature phone jack (E11-0188-05), AC power cord (E30-2717-05).
- Metallic cabinet: (A01-3440-01)
Important Note: For semiconductor descriptions (X32, IC9 9 MPEG u-COM) and detailed disassembly, refer to the LVD-290 service manual (B51-5233-00).
⚠️ Attention! To prevent fire or other accidents, repair of the switching power supply P.C.B. (W02-2568-35) is prohibited. If the P.C.B. is defective, replace the complete P.C.B. with a new one.
Contents
| Section | Page |
|---|---|
| CONTENTS / ACCESSORIES / CAUTIONS | 2 |
| ADJUSTMENT | 3 |
| PC BOARD | 5 |
| SCHEMATIC DIAGRAM | 9 |
| EXPLODED VIEW | 26 |
| PARTS LIST | 28 |
| PARTS DESCRIPTIONS | 37 |
| SPECIFICATIONS | Back cover |
Accessories
- Audio cord (2): (E30-0505-05)
- Video cord (1): (E30-1427-05)
- System control cord (1): (E30-2733-05)
- AC plug adaptor (1): (E03-0115-05) - Used to adapt the power cord to wall outlets in regions where necessary.
Cautions
Beware of condensation
Condensation can occur when water vapor contacts cold surfaces, potentially affecting operation. If condensation occurs, do not assume a malfunction. Dry the unit by turning the POWER switch ON for several hours.
Be especially careful in the following conditions:
- When moving the unit from a cold to a warm place with a significant temperature difference.
- When a heater is operating nearby.
- When moving the unit from an air-conditioned environment to a place with high temperature and humidity.
- When there is a large difference between the unit's internal temperature and the ambient temperature, or in conditions prone to condensation.
Note related to transportation and movement
Before transporting or moving the unit, perform the following:
- Turn the power ON but do not load a disc.
- Verify that the "NO DISC" display appears.
- Wait a few seconds and turn the power OFF.
Adjustments
Main Unit Adjustments (X34-1033)
| No. | ITEM | INPUT SETTING | OUTPUT SETTING | PLAYER SETTING | ALIGNMENT POINT | ALIGN FOR | FIG. |
|---|---|---|---|---|---|---|---|
| 1 | TILT BALANCE | LD TEST DISC | Connect the TV monitor to the video output. | Frame No.19,001 STILL (Still image) Frame No.23,402 STILL (still image) | VR3 | Minimize the crosstalk on the screen. | (a) |
| 2 | FOCUS BALANCE | TEST DISC | Connect an oscilloscope to RF : CN3 pin 6 (EFM). | Frame No.20,000 STILL (still image) | VR2 | Maximize the RF signal (eye pattern) amplitude. | (a) |
Setting the TEST MODE (Short-circuiting the CN7 pin 1 and 2 in AC IN mode : TE OFF)
| No. | ITEM | INPUT SETTING | OUTPUT SETTING | PLAYER SETTING | ALIGNMENT POINT | ALIGN FOR | FIG. | |
|---|---|---|---|---|---|---|---|---|
| 3 | TRACKING BALANCE | TEST DISC | Connect an oscilloscope to TE : CN3 pin 1. | TE OFF | VR1 | Symmetry between upper and lower. | (b) | |
| 4 | FOCUS GAIN | TEST DISC | Apply a signal (1.0kHz/0.2Vp-p) to CN3 pins 4 and 5. | Connect an L.P.F. to CN3 pins 4 and 5, to which connect an oscilloscope or two AC voltmeters. | PLAY | VR4 | Two VTVMs should read the same level. | |
| 5 | TRACKING GAIN | TEST DISC | Apply a signal (1.3kHz/0.2Vp-p) to CN3 pins 1 and 2. | Connect an L.P.F. to CN3 pins 1 and 2, to which connect an oscilloscope or two AC voltmeters. | PLAY | VR5 | Two VTVMs should read the same level. | |
| 6 | VIDEO LEVEL | LD TEST DISC | Terminate the video output with a 75Ω resistor and connect an oscilloscope to both ends. | Frame No.100 STILL(still image) Frame No.13,000 STILL(still image) | VR7 | Video signal amplitude to 1.0Vp-p | ||
| 7 | 4Fsc | POWER ON | Connect a frequency counter to check land (14M) of IC3 pin 7. | STOP | TC1 | 14.31818MHz±50Hz |
VIDEO CD UNIT (X35-2170-20) Setting the power on
| No. | ITEM | INPUT SETTING | OUTPUT SETTING | PLAYER SETTING | ALIGNMENT POINT | ALIGN FOR | FIG. |
|---|---|---|---|---|---|---|---|
| 8 | VIDEO CD CLOCK | POWER ON | Connect a frequency counter to check land (13.5MHz) of IC2 pin 99(R16). | STOP | TC1 | 13.5MHz±50Hz |
Note: L.P.F.: 33kΩ+1000pF or so, CD disc: CD test disc (SONY YEDS-18 or equivalent), LD disc: CAV30cm (with digital sound), STILL: Remote controller's key. fig.: Waveform (P.12)
Mechanism Adjustment Procedure
| No. | ITEM | INPUT SETTING | OUTPUT SETTING | PLAYER SETTING | ALIGNMENT POINT | ALIGN FOR | FIG. |
|---|---|---|---|---|---|---|---|
| <1> | TANGENTIAL | CD TEST DISC | Connect an oscilloscope to CN3 pin 6 (EFM). (MAIN UNIT) | PLAY | Tangential nut (Turn within ±4 clicks) | Maximize the RF signal (eye pattern) amplitude. | (a) |
| <2> | R-DEPENDENCE | CD TEST DISC | Connect an L.P.F. to CN3 pins 7 and 8, to connect an oscilloscope and select X-Y mode. (MAIN UNIT) | PLAY | R-dep. nut (Less than ±10°) | Adjust so that the Lissajous waveform becomes -45°. |
Note: CD disc: CD test disc (SONY) YEDS-18 or equivalent), LD disc: CAV 30cm (with digital sound)
Radial-Dependence Adjustment: Slide the pickup to meet with the center of the pickup and that of the turntable.
Tangential Adjust: Keep the disc horizontally for the pickup.
Diagram (a) TILT BALANCE / FOCUS BALANCE / TANGENT: Illustrates the connection of an oscilloscope to Main unit (X34) CN3 pin 6 and CN7, with GND. The output waveform should be greater than 2.0Vp-p.
Diagram (b) TRACKING BALANCE: Illustrates the connection of an oscilloscope to Main unit (X34) CN3 pin 1 and CN7, with GND. The output waveform shows levels E and F, where E = F.
PC Board and Schematic Diagrams
This section provides detailed views and diagrams of the unit's internal circuitry.
PC BOARD (Component Side View)
- LD player unit (X34-1033-00): Shows component placement for the main board. Key areas include Analog Audio, Video Select, RF Filter, Video Demod, and various ICs (IC1, IC2, IC3, IC4, IC5, IC6, IC7, IC8, IC9, IC10, IC11, IC12).
- Sub-circuit unit (X13-7400-20): Details components for sub-circuits like Key Control & Echo, and connections via CN1, CN2.
- Video unit (X35-2170-20): Shows components for the video processing section, including ICs like IC4, IC8, IC9, IC10, IC11, IC12, and connectors like CN1, CN2, CN3.
- Display unit (X25-5983-00): Illustrates the front panel display components and connections.
- Various other units (e.g., X25-C/6, X25-D/6, X25-E/6, X25-F/6) are also detailed with their respective components and connections.
Note: Refer to the schematic diagram for the value of resistors and capacitors.
Schematic Diagrams
Detailed schematic diagrams are provided for various sections of the unit, illustrating the interconnections between components and ICs. These include:
- MECHA ASS'Y (X92-1621-01): Schematics for the pickup mechanism, including Tilt Sensor, Laser Diode Drive, APC, Focus Coil, Tracking Motor Drive, and various ICs (IC10, IC11, IC12, IC13, IC14, IC15, IC16, IC19, IC22, IC23, IC24, IC26, IC27, IC28, IC30, IC31, IC33, IC34, IC35).
- MECHA ASS'Y (BLACK:X92-1680-91) (GOLD:X92-1681-01): Schematics for the loading mechanism, including Slider Motor, Spindle Motor, and associated driver ICs (IC10, IC12, IC13, IC14, IC15, IC16, IC19, IC22, IC23, IC24, IC26, IC27, IC28, IC30, IC31, IC33, IC34, IC35).
- IC3 - DIGITAL VIDEO PROCESSOR: Detailed pinout and connections.
- IC2 - VIDEO SIGNAL DEMODULATION: Schematic for video signal processing.
- IC7 - D.S.P.: Digital Signal Processor details.
- IC8 - MICRO CODE (ROM): Memory unit schematics.
- IC9 - u-COM: Microcontroller unit schematics.
- IC10 - DIGITAL VIDEO ENCODER: Schematic for video encoding.
- Various ICs such as MPEG1 Video Decoder (IC2), Servo/Audio RF Amp (IC23), Electric Volume (IC27), etc., are detailed with their connections and voltage levels.
CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts. Indicates safety critical components. For continued protection against risk of fire, replace only with same type and rating fuse(s). To reduce the risk of electric shock, leakage-current or resistance measurements shall be carried out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer.
DC Voltage Measurement: DC voltage is an actual reading measured with a high impedance type voltmeter. Values may vary depending on measuring instruments or product. Refer to voltage during LD PLAY unless otherwise specified. Values in () are at STOP. Values followed by (CD) refer to CD PLAY.
Exploded Views
Exploded views illustrate the physical assembly of the unit's components.
Exploded View (CD Mechanism)
This view shows the mechanical parts of the CD mechanism, including:
- Motor Assy (DM)
- DC Motors (FM, LM, PU)
- Various springs, washers, screws, and mechanical linkages (e.g., AA Ø 2x5, AB Ø 2.6x8, AF WASHER, AG WASHER).
- Optical pickup head (PU).
Exploded View (Unit)
This view details the overall unit assembly:
- Main chassis and sub-chassis assemblies.
- Various mechanical parts like arms, rods, cams, gears, pulleys, and belts.
- Front panel components including buttons (S1-S14, S16-S19), LEDs, and the remote sensor.
- Power cord and other external connections.
Note: Parts with numbers larger than 700 are not supplied.
Parts List
The parts list provides reference numbers, part numbers, descriptions, and destination/remark codes for all components. Key sections include:
- Main Unit Parts: Metallic Cabinet, Panels, Escutcheon, Front Glass, Indicator, Filter, Warranty Card, Caution Card, Instruction Manuals, Extension Shaft, AC Plug Adapter, Audio Cords, AC Power Cords, Cord with Plug, Insulating Board, Soft Tape, Cushion, Carton Board, Packing Fixtures, Protection Covers/Bags, Item Carton Case.
- Sub-circuit unit (X13-7400-21): Capacitors (CE, CK, CC, CQ, CF types), Pin Assy (CN1, CN2), and MOS-IC (IC1 TC9409BF-001).
- Display unit (X25-5983-00): LEDs (D15-D18), Capacitors (C1-C24), and various other components.
- Mechanism Assy (X92-1621-11/X92-1681-21): Chassis, Sub-chassis assemblies, Arms, Rods, Cams, Gears, Pulley, Belt, Retainer, Wiring Harness, Flat Cable Assy, Compression Spring.
- Various ICs (e.g., LA7133, TC7SHU04FU, PQ20VZ11, LA9420MKMT, RF5C292, IC1-IC11, IC13-IC16, IC19, IC22-IC24, IC26-IC31, IC33-IC35) and Transistors/Diodes (Q1-Q76, D1-D613) are listed with their respective part numbers and descriptions.
- Resistors (RK73FB series) and Capacitors (various types like CC, CK, CE, CF, CQ) are extensively listed with their values, codes, and specifications.
Note: "▲" indicates safety critical components.
Parts Descriptions
Detailed descriptions explain the coding systems used for capacitors, resistors, and other components, including:
- Capacitors: Explanation of type, shape, dimension code, temperature coefficient, voltage rating, value, and tolerance codes.
- Resistors: Explanation of chip resistor (Carbon) and carbon resistor (Normal type) coding, including dimension codes, rating wattage, and tolerance.
Specifications
| Category | Specification |
|---|---|
| Type | Video disc format: Laser Vision format Signal read system: Semiconductor laser Video output format: PAL/NTSC (V-CD), NTSC (LD) |
| Video Section | Video output level: 1 Vp-p (75 Ω load, sync. negative) Horizontal resolution: 425 lines Video signal to noise ratio: More than 48 dB |
| Audio Section | Frequency response: 4 Hz~20 kHz Signal to noise ratio: More than 115 dB Dynamic range: More than 90 dB Total harmonic distortion: Less than 0.008% (1 kHz) Wow and flutter: Below measurable limit (±0.001%W. PEAK) |
| Output Level/Impedance | 1.2 V/1 kΩ (DIGITAL SOUND) 300 mV/1 kΩ (ANALOG SOUND) 300 mV/75 Ω (AC-3 RF output) |
| Input Sensitivity/Impedance | 7 mV/47 kΩ (MIC 1, 2) |
| Operating Conditions | Allowable operating temperature range: 5°C~40°C Allowable operating humidity range: 5%~90% (condensation should not form) |
| General | Power consumption: 35 W Dimensions: W: 400 mm (15-3/4"), H: 140 mm (5-1/2"), D: 427 mm (16-13/16") Weight (net): 6.5 kg (14.3lb) |
KENWOOD follows a policy of continuous advancements in development. Specifications may be changed without notice.
Note: Component and circuit are subject to modification for best operation under differing local conditions. This manual is based on Europe (E) standard and provides information on regional circuit modification and component variations.
Kenwood Service and Support Information
- KENWOOD CORPORATION: 14-6, Dogenzaka 1-chome, Shibuya-ku, Tokyo, 150 Japan
- KENWOOD SERVICE CORPORATION: P.O BOX 22745, 2201 East Dominguez St., Long Beach, CA 90801-5745, U.S.A.
- KENWOOD ELECTRONICS CANADA INC.: 6070 Kestrel Road, Mississauga, Ontario, Canada L5T 1S8
- KENWOOD ELECTRONICS LATIN AMERICA S.A.: P.O BOX 55-2791, Piso 6 plaza Chase, Cl. 47 y Aquilino de la Guardia Panama, Republic de Panama
- KENWOOD ELECTRONICS U.K. LIMITED: KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB., United Kingdom
- KENWOOD ELECTRONICS BENELUX N.V.: Meachelsesteenweg 418, B-1930 Zaventem, Belgium
- KENWOOD ELECTRONICS DEUTSCHLAND GMBH: Rembrücker Str. 15, 63150 Heusenstamm, Germany
- KENWOOD ELECTRONICS FRANCE S.A.: 13 Boulevard Ney, 75018 Paris, France
- KENWOOD ELECTRONICS ITALIA S.p.A.: Via G. Sirtori, 7/9 20129, Milano, Italy
- KENWOOD IBÉRICA S.A.: Bolivia, 239-08020 Barcelona, Spain
- KENWOOD ELECTRONICS AUSTRALIA PTY. LTD.: P.O Box 504, 8 Figtree Drive, Australia Centre, Homebush, N.S.W. 2140, Australia
- KENWOOD & LEE ELECTRONICS, LTD.: Unit 3712-3724, Level 37, Tower 1, Metroplaza, 223 Hing Fong Road, Kwai Fong N.T., Hong Kong
- KENWOOD ELECTRONICS GULF FZE: P.O.Box 61318, Jebel Ali, Dubai, U.A.E.
- KENWOOD ELECTRONICS SINGAPORE PTE LTD.: No. 1 Genting Lane #02-02, KENWOOD Building, Singapore, 349544
- KENWOOD ELECTRONICS (MALAYSIA) SDN BHD.: #4.01 Level 4, Wisma Academy Lot 4A, Jalan 19/1 46300 Petaling Jaya Selangor Darul Ehsan Malaysia
