Sony HCDMC-1 Service manual

HCD-MC1

SERVICE MANUAL

Ver 1.1 2001. 10

• This set is the tuner, deck, CD and amplifier section in MHC-MC1.

Manufactured under license from Dolby Laboratories Licensing Corporation. “DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.

CD Section

Tape deck Section

Model Name Using Similar Mechanism HCD-F150/FR10

CD Mechanism Type CDM-46B1

Optical Pick-up Name KSS-213BA/F-NP

Model Name Using Similar Mechanism HCD-DR8AV

Tape Transport Mechanism Type TCM-230AWR2/230PWR2

US Model

E Model

SPECIFICATIONS

Amplifier section U.S.A models:

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION: With 8 Ω loads both channels driven, from 70 – 20,000 Hz; rated 80 W per channel minimum RMS power, with no more than 0.9% toral harmonic distortion from 250 mW to read output.

Continuous RMS power output

80 + 80 W(8Ω at 1kHz, 10% THD)

Tortal harmonic distortion

less than 0.09%(8Ω at 1kHz, 40W)

Inputs VIDEO/MD IN (phono jack):

voltage 250mV/450mV, impedance 47kΩ

Outputs VIDEO/MD OUT (phono jack):

voltage 250mV, impedance 1kΩ

PHONES (stereo phone jacks):

accepts headphones of 8Ω or more

SPEAKER :accepts impedance of 8 to 16Ω REAR SPEAKER :

accepts impedance of 16Ω

SUPER WOOFER :

Voltage 1V, impedance 1kΩ

CD player section

System Compact disc and digital audio system Laser Semiconductor laser (λ =780mm)

Emission duration: continuous

Laser output Max. 44.6µW*

*This output is the value measured at a distance of 200 mm from the objective lens surface on the Optical Pick-up Block with 7 mm aperture.

Frequency response 2Hz – 20kHz (±0.5dB) Wavelength 780 – 790nm Signal-to-noise retio More than 90dB Dynamic range More than 90dB CD OPTICAL DIGIT AL OUT (Square optical connector jack, rear panel) Output Level –18dBm

Tape player section

Recording system 4-track 2-channel stereo Frequency response (DOLBY NR OFF)

40 – 13,000Hz (±3dB), using Sony TYPE I cassette 40 – 14,000Hz (±3dB), using Sony TYPE II cassette

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0MHz Antenna FM lead antenna Antenna terminals 75Ω unbalanced Intermediate frequency 10.7MHz

— Continued on next page —

9-928-899-12

2001J1600-1

MINI HI-FI COMPONENT SYSTEM

Sony Corporation

Home Audio Company

Published by Sony Engineering Corporation

AM tuner section

Tuning renge 530 – 1,710kHz

Antenna AM loop antenna Antenna terminals External antenna terminal Intermediate frequency 450kHz

General

Power requirements US model : 120V AC, 60Hz

Power consumption US model : 200W Dimensions (w/h/d) Apprex. 280 × 373 × 437mm

Mass Apprex. 11.2kg (24 lb 11 oz) Supplied accessories: AM loop antenna (1)

Design and specifications are subject to change without notice.

(with the interval set at 10kHz) 531 – 1,710kHz (with the interval set at 9kHz)

E model : 110 - 120V or 220 - 240V AC, 50/60Hz

E model : 250W

(11

/8 × 143/4 × 171/4 in)

Remote RM-SF150 (1) Batteries (2) FM lead antenna (1) Speaker cords (2) Front speaker pads (8)

— 2 —

Laser component in this product is capable of emitting radiation exceeding the limit for Class 1.

SAFETY CHECK-OUT

(US model only)

After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.

LEAKAGE

This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.

The following caution label is located inside the unit.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers). Leakage current can be measured by any one of three methods.

1. A commercial leakage tester , such as the Simpson 229 or RCA WT -540A. Follow the manufacturers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter . The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

To Exposed Metal Parts on Set

0.15µF

1.5k

Ω

voltmeter (0.75V)

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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 PUBLISHED BY SONY .

Earth Ground

Fig. A. Using an AC voltmeter to chec k AC leakage .

— 3 —

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

TABLE OF CONTENTS

1. GENERAL

FRONT PANEL ·····································································5 REAR PANEL········································································ 6

2. DISASSEMBLY ·······························································8

3. TEST MODE ··································································· 16

4. MECHANICAL ADJUSTMENTS ···························· 18

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION CHECK

Carry out the “S curve check” in “CD section adjustment” and check that the S curve waveform is output repeatedly.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged

by heat.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C during

repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or

unsoldering.

5. ELECTRICAL ADJUSTMENTS

Deck Section ········································································ 21 CD Section ··········································································· 24

6. DIAGRAMS

6-1. Block Diagram CD Section ············································27

Block Diagram Main Section ········································ 29

Block Diagram Audio Section········································ 31 6-2. Circuit Boards Location ··················································· 33 6-3. Printed Wiring Board BD Section·································· 35 6-4. Schematic Diagram BD Section·····································37 6-5. Printed Wiring Board CD Motor Section······················· 39 6-6. Schematic Diagram CD Motor Section·························· 41 6-7. Printed Wiring Board Audio Section······························43 6-8. Schematic Diagram Audio Section································· 45 6-9. Printed Wiring Board Leaf SW Section ························· 47 6-10. Schematic Diagram Leaf SW Section ····························49 6-11. Printed Wiring Board Main Section ······························· 51 6-12. Schematic Diagram Main (1/5) Section ·························53 6-13. Schematic Diagram Main (2/5) Section ·························55 6-14. Schematic Diagram Main (3/5) Section ·························57 6-15. Schematic Diagram Main (4/5) Section ·························59 6-16. Schematic Diagram Main (5/5) Section ·························61 6-17. Printed Wiring Board Panel Section······························· 63 6-18. Schematic Diagram Panel Section ································· 65 6-19. Printed Wiring Board Power Section ····························· 67 6-20. Schematic Diagram Power Section ································69 6-21. Waveforms········································································ 71 6-22. IC Pin Function Description············································· 72 6-23. IC Block Diagrams··························································· 80

— 4 —

7. EXPLODED VIEWS ····················································· 81

8. ELECTRICAL PARTS LIST ····································· 89

FRONT PANEL

4 3 2

#§ #∞

#¢ #£

#™

#¡

SECTION 1

GENERAL

576980

!¡ !™

!£

!¢ !∞

!§ !¶

!• @º!ª

@¡ @™

@£

1 1/u button 2 DISPLAY/MEMO button 3 CLOCK TIMER SET button 4 TIMER SELECT button 5 TAPE A ª button 6 CD ﬂ button 7 TAPE A · button 8 TAPE B ª button 9 TUNER/BAND button 0 TAPE B · button !¡ SUR button !™ DBFB button !£ FUNCTION button !¢ CONTINUE/DIRECTION button !∞ PROGRAM/DOLBY-NR button !§ SHUFFLE/STEREO/MONO button !¶ REPEAT/TUNER MEMORY button !• GROOVE button

@¢@∞@ª @•#º @§@¶

!ª LOOP button @º FLASH button @¡ CD PLUS ONE button @™ GROUP ENTRY button @£ Numeric buttons @¢ PHONES jack @∞ VOLUME Knob @§ STOP button @¶ INPUT, SCAN, SEARCH, CHECK,

CLEAR, DELETE buttons

@• CD )+, + button @ª SELECTOR button #º CD -0, = button #¡ ENTER button #™ FILE SELECT button #£ P PAUSE button #¢ r REC button #∞ CD SYNCHRO button #§ HI-SPEED DUBBING button

— 5 —

REAR PANEL

1 VIDEO/MD (AUDIO) jack 2 ANTENNA terminal 3 AC power cord 4 REAR SPEAKER terminal 5 SPEAKER terminal 6 CD DIGITAL OUT connector 7 SUPER WOOFER jack

— 6 —

This section is extracted from instruction manual.

— 7 —

• This set can be disassembled in the order shown below.

)

SECTION 2

DISASSEMBLY

Case (Page 8)

Note: Follow the disassembly procedure in the numerical order given.

Front panel

section

(Page 9)

Back panel (Page 10)

Sub chassis (Page 11)

Tape mechanism deck section (Page 14)

Door assy (Page 9)

Main board (Page 10)

CD mechanism deck section (Page 12)

Audio board (Page 14)

2-1. CASE

Case

Power transformer (T901) (Page 11)

Base

unit

(Page 12)

BD board, sled motor (M102) (Page 13)

Capstan motor (M1) (Page 15)

Optical pick-up (KSS-213D/Q-NP) (Page 13)

Three screws

(BVTP 3

Three screws

(CASE3 TP2)

— 8 —

Three screws

(CASE3 TP2

2-2. FRONT PANEL SECTION

(17 core)

Wire (flat type)

(15 core)

Two claws

(BVTT 3

Wire (flat type)

Screws

Lug

2-3. DOOR ASSY

T wo screws

(PTPWH 2.6

Wire (flat type) (15 core)

Connector CN108

Connector CN454

Two claws

Three screws

(BVTP 3

Open the door ass'y

— 9 —

Remove the door ass'

to direction of the arrow

2-4. BACK PANEL

)

Wire (flat type) (13 core)

Connector

Thirteen screws

(BVTP 3

Remove the back panel

to direction of the arrow.

Cover

Five screws

(BVTP 3

2-5. MAIN BOARD

Two connectors

Four connectors

Three connectors

Remove the MAI board to direction of the arrow.

Wire (flat type) (16 core)

— 10 —

Wire (flat type) (9 core)

Two screws

(BVTP 3

2-6. POWER TRANSFORMER (T901)

)

Power transforme

Four screws

(BVTT 3

Connector

Power cor

2-7. SUB CHASSIS

Three screws

(BVTP 3 × 8)

(BVTT 3 × 8)

Sub chassis

Two screws

— 11 —

Two screws

(BVTP 3 × 8

2-8. CD MECHANISM DECK SECTION

)

Reinforcement

Screw

(PTPWH 2.6

Two screws

(BVTT 3

Screw

(BVTP 3

14)

Wire holder

Three screws

(BVTT 3

!¡

Screw

(BVTT 3

10)

Base (LOADING)

!™

10)

Bwo screws

(BVTP 3

Base (CDM

Table (SO)

2-9. BASE UNIT

Bracket

Two screws

(BTVP 3 × 8)

Two tention springs

Base unit

Cover (CD)

Four screws

(PTPWH 2.6 × 8)

— 12 —

2-10. BD BOARD, SLED MOTOR (M102)

)

Gear (A) (S)

Claw

!º

Two screws (+P 2 × 2)

!¡

Sled motor

(M102)

Gear cover

Three claws

Gear (B) (RP)

Wire (flat type) (16 core

BD board

Removal

four solders.

2-11. OPTICAL PICK-UP (KSS-213BA/F-NP)

Remove the optical pick-up to direction of the arrow

Screw (+PTPWH 2 × 5)

Sled shaft

Claw

— 13 —

2-12. TAPE MECHANISM DECK SECTION

Remove the cassette lid (L) ass'y

to direction of the arrow

Remove the cassette lid (R) ass'y

to direction of the arrow

Remove the tape mechanism

deck section.

Three screws

(BVTP 2.6

Three screws

(BVTP 3

2-13. PANEL BOARD

Remove the

cassette lid (R) assy

(BVTP 2.6

TC bracket

cassette lid (L) assy

TORSION SPRING (DOOR2)

!™

Seven screws

(BVTP 2.6

Two screws

Remove the

TORSION SPRING (DOOR1)

!™

Six screws

(BVTP 2.6

!£

Remove the panel boar

!™

Six screws

(BVTP 2.6

VOL ring

VOL knob

— 14 —

!¡

JOG ring

2-14. AUDIO BOARD

Two screws

(BTP 2.6

AUDIO board

Break the soldering of two

flexible flat cables.

Four rivets

2-15. CAPSTAN MOTOR (M1)

Removal the capstan motor

to direction of the arrow.

Hang the belt.

Two screws

(BTP 2.6 × 8)

— 15 —

SECTION 3

TEST MODE

[MC Cold Reset]

* The cold reset clears all data including preset data stored in the

RAM to initial conditions. Execute this mode when returning the set to the customer.

Procedure:

1. Press the three buttons STOP , ENTER and FUNCTION at the same time.

2. The fluorescent indicator tube turns off for a moment and the RAM is reset to the initial conditions.

[MC Hot Reset]

* This mode resets the set with the preset data kept stored in the

memory. This hot reset mode is performed also when the power cord is plugged in and out.

Procedure:

1. Press the three buttons STOP , ENTER and GROUP 1 at the same time.

2. The fluorescent indicator tube turns off for a moment and the RAM is reset to the initial conditions.

[CD Initial]

* The CD INITIAL clears all of the CD related data. Execute

this mode when returning the set to the customer.

Procedure:

1. Press the three buttons STOP , ENTER and GROUP 4 at the same time.

2. The message “STANDBY” appears on the fluorescent indicator tube and the CD related data is reset to the initial conditions.

[CD Line Test]

* The CD Line test displays the rotating time required for one

rotation by rotating the disc tray.

Procedure:

1. Press the three buttons STOP , ENTER and GROUP 5 at the same time. The CD PLAY LED and the CD PAUSE LED flash alternately and the disc tray starts rotation.

2. The message “xx << y.y” appears on the fluorescent indicator tube. The left numbers count up the discs starting from 1 to 51. The left numbers “y.y” indicate the rotating time required for one rotation by rotating the disc tray.

3. To exit the CD LINE test mode, execute the MC Hot Reset.

[CD Memo All Clear]

* The mode clears all contents of the CD disc memo. Execute

this mode when returning the set to the customer.

Procedure:

1. Press the three buttons STOP , ENTER and GROUP 2 at the same time. The HCD-MC1 enters the GC test mode, and all of the fluorescent tubes and LEDs turn on.

2. From this state, any one of the three modes GROUP 1, GROUP 2 and GROUP 3 can be selected. Go to step 3 to enter the GROUP 1 test mode. Go to step 5 to enter the GROUP 2 test mode. Go to step 11 to enter the GROUP 3 test mode.

3. [GROUP 1 test mode ] From the state of step 2, press the GROUP 1 button. Every pressing of the GROUP 1 button advances the following check modes and displays in the given order. Model name display, destination display, MC version display, GC version display, DC version display, VC version display and CC version display.

4. To exit the GC test mode and to return to the ST ANDBY mode, press the STOP , ENTER and GROUP 2 buttons again.

5. [GROUP 2 test mode ] You can enter this mode directly from step 2. When you performed steps 3, perform steps 4, then 1 and 2 before starting the step 5. [GROUP 2 test mode ] From the GC test mode, press the GROUP 2 button to enter the key check mode. The display: K 1, J 0, V 0 appears.

6. The value after K indicates the number of times that the key is pressed. 1 is displayed because the GROUP 2 button has already been pressed.

7. When other keys are pressed one after another, the key count increases up to 43. The keys which have already been pressed, are not counted.

8. The value after J indicates the number of clicks that the JOG dial is rotated. The clockwise rotation increases the count value. The counter-clockwise rotation decreases the count value.

9. The value after V also indicates amount of rotation of volume control. The clockwise rotation increases the count value. The counter-clockwise rotation decreases the count value.

10. T o exit the GC test mode and to return to the STANDBY mode, press the STOP , ENTER and GROUP 2 buttons again.

11. [GROUP 3 test mode ] You can enter this mode directly from step 2. When you performed steps 3, perform steps 4, then 1 and 2 before starting the step 5. [GROUP 3 test mode ] From the GC test mode, press the GROUP 3 button to enter the VACS attenuation check mode. The display: VOL NORMAL appears.

12. T o exit the GC test mode and to return to the STANDBY mode, press the STOP , ENTER and GROUP 2 buttons again.

[MC Test Mode]

* This mode checks operation of amplifier and cassette deck.

How to enter the MC test mode:

Press the three buttons of STOP , ENTER and GROUP 3 . “EQ CHECK” display on the FL tube and the VOLUME display flash. In addition the LEDs of the JOG dial, FF and REW flash indicating the MC test mode.

Procedure:

1. Press the two buttons MEMO INPUT and FLASH at the same time.

2. The message “ALL ERASE” appears on the fluorescent indicator tube and the CD disc memo is all cleared.

[GC Test Mode]

* This mode checks microprocessor version number, keys,

fluorescent tubes, LEDs and VACS (Variable Attenuation Control System).

— 16 —

Check procedure:

You can perform any of the following five steps. However, it is recommended to perform them in the following order because the skipped cannot be performed if the checks are not performed in the given order.

1. EQ Check Mode

The GEQ becomes maximum when the JOG dial is turned clockwise. The GEQ becomes minimum when the JOG dial is turned counter-clockwise. The GEQ comes to center when the FILE SELECT button is pressed.

2. VOLUME Check Mode

The maximum volume is set, and the VOLUME MAX display and the GEQ display are displayed for a moment regardless of the amount of volume rotation. The minimum volume is set, and the VOLUME MIN display and the GEQ display are displayed for a moment regardless of the amount of volume rotation.

3. Deck Check Mode

Install a tape to the deck B. Select T APE B with the FUNCTION button. Recording starts and PAUSE is released when the REC button is pressed. VIDEO is selected by the input FUNCTION. Press the STOP button to stop recording and select TAPE B with the FUNCTION button. Rewind the tape by pressing the REW button and stop at the recording start point. Start playback from the recording start point.

4. High Speed Check Mode-1

Install a tape to the deck A. Select TAPE A with the FUNCTION button. Press the PLA Y button then press the HI-SPEED DUBBING button during playback. The normal playback is obtained during normal speed playback and the double speed playback is obtained during the double speed playback.

5. High Speed Check Mode-2

Install a tape to the deck B. Select T APE B with the FUNCTION button. Press the REC button. When the P AUSE is released , recording is started. When the HI-SPEED DUBBING button is pressed during recording, the double speed recording is established only when the button is pressed.

[Aging Mode]

The decks A and B are operated automatically for aging purpose. When errors occur during aging, causes of errors are displayed and the aging mode is stopped.

5. The tape A is rewound and stops at the shut-off. The aging mode advances to the next step. The message: TAPE A AG-5 appears.

6. The tape B is played back in the FWD mode. After two minutes of the FWD playback, the aging mode advances to the next step. The message: TAPE B AG-2 appears.

7. The tape B runs in fast forward. After two minutes of fast forward, or at the shut-off point, the tape is stopped and the aging mode advances to the next step. The message: TAPE B AG-3 appears.

8. The tape B is played back in the RVS mode. After two minutes of the R VS playback, the aging mode advances to the next step. The message: TAPE B AG-4 appears.

9. The tape B is rewound and stops at the shut-off. The aging mode advances to the next step. The message: TAPE B AG-5 appears.

[Function Change Mode]

* Select either VIDEO or MD of the external FUNCTION input.

Procedure:

1. Turn off the power.

2. Press the two buttons ENTER and POWER at the same time. The main power is turned on and the other function of the previous function is selected and displayed. “MD” or “VIDEO”

[AM TUNER STEP 9 kHz/10 kHz Selection Mode]

* Either the 9 kHz step or 10 kHz step can be selected for the AM

channel step.

Procedure:

1. Turn on the power and select TUNER using the FUNCTION button.

2. Select AM with the TUNER/BAND button and turn off the power.

3. Press the two buttons FUNCTION and POWER at the same time. The main power is turned on and the other frequency step of the previous mode is selected and displayed. “AM 9k STEP” or “AM 10k STEP”

How to enter the aging mode

1. Turn on the main power. Install a playback tape to deck A and install a blank tape to deck B.

2. Select TAPE A with the FUNCTION button.

3. Press the three buttons of STOP , ENTER and GROUP ENTRY at the same time to enter the aging mode.

How to exit the aging mode.

Turn off the main power.

1. Rewind the tapes A and B. Tapes stop at the shut-off of tape A and the aging mode advances to the next step. The message: TAPE A AG-1 appears.

2. The tape A is played back in the FWD mode. After two minutes of the FWD playback, the aging mode advances to the next step. The message: TAPE A AG-2 appears.

3. The tape A runs in fast forward. After two minutes of fast forward, or at the shut-off point, the tape is stopped and the aging mode advances to the next step. The message: TAPE A AG-3 appears.

4. The tape A is played back in the RVS mode. After two minutes of the R VS playback, the aging mode advances to the next step. The message: TAPE A AG-4 appears.

— 17 —

SECTION 4

MECHANICAL ADJUSTMENTS

• TAPE MECHANISM DECK SECTION

Precaution

1. Clean the following parts with a denatured alcohol-moistened swab: record/playback heads pinch rollers erase head rubber belts capstan idlers

2. Demagnetize the record/playback head with a head demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the parts adjusted.

5. The adjustments should be performed with the rated power supply voltage unless otherwise noted.

• T orque Measurement

Mode

FWD

FWD back tension

REV

REV back tension

FF/REW

FWD tension

REV tension

• CD MECHANISM DECK SECTION

To adjust the mechanism section, enter the mechanism section adjustment mode. For how to enter the mechanism section adjustment mode, refer to each adjustment section.

Torque meter

CQ-102C

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

Meter reading

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

71 to 143 g • cm

(0.98 – 1.99 oz • inch)

100 g or more

(3.53 oz or more)

100 g or more

(3.53 oz or more)

DISC SENSOR ALIGNMENT

1. Make sure that there is no disc in the unit.

2. Connect an oscilloscope to IC401$™, IC4024 of the MAIN board.

oscilloscop

IC401$™ D.SENS (CH1)

IC401

HHOUT (CH2)

GND

3. Turn the power switch on.

4. Press the p button, ENTER button and GROUP 5 button simultaneously.

— 18 —

PLUS ONE

5. The disc table rotates in the clockwise direction. The disc table rotation time is displayed with ‘’PLUS ONE” slit as a measuring point.

6. Measure the waveform of the oscilloscope when the disc table is rotating.

7. Move the holder (sensor) center so that the flat portion center at the top of the D.SENS (CH1) input waveform and the ‘’H” center of HHOUT (CH2) coincide.

D.SENS (CH1) waveform

Holder (sensor)

HHOUT (CH2) waveform

Fixed screw

Flat portion center of D.SENS (CH1) waveform

8. Tighten the fixed screw to fix the disc table, then press the CLEAR button.

9. The disc table rotates in the counterclockwise direction. Measure the waveform and make sure that the flat portion center at the top of the D.SENS (CH1) input waveform and the ‘’H” center of HHOUT (CH2) coincide.

10. If the adjustment is not successful, press the CLEAR button to rotate the disc table in the clockwise direction, and perform steps 6 to 9.

Note:During the adjustment mode, the rotational direction is switched each time the CLEAR button is pressed.

Pressing the CHECK button enters the loading mode which will be described later. Pressing the CLEAR button rotates the disc table again.

— 19 —

MAGNET ASSY ALIGNMENT

)

1. Check that there is no disc in the unit and then turn ON the power. Open the door, and set a disc in the PLUS ONE slit.

2. Close the door, and while pressing the p button, ENTER button and GROUP 5 button simultaneously.

3. Press the CHECK button, and set the loading mode.

4. Press the + ‚± button and chuck the disc.

5. Adjust the magnet assembly and magnet holder so that A=B as shown in the figure.

Magnet ASSY

Magnet holder

Magnet ASSY

Screw (For adjustment

DISC HOLDER A ALIGNMENT

1. Check that there is no disc in the unit and then turn ON the power. Open the door, and set a disc in the PLUS ONE slit.

2. Close the door, and while pressing the p button, ENTER button and GROUP 5 button simultaneously.

3. Press the CHECK button, and set the loading mode.

4. Press the + ‚± button and chuck the disc.

5. Press + ‚± or ≠º – button to stop the disc holder A slightly away from the disc.

6. Rotate and adjust the adjusting screw so that the center of the disc and that of the disc holder coincide.

Disc

Disc holder A

a = b

Disc holder A

Disc

Screw (For adjustment)

— 20 —

SECTION 5

MAIN board CN301 set

test tape P-4-A100 (10 kHz, –10 dB)

oscilloscope

L-CH

R-CH

waveform of oscilloscope

in phase 45°90°135°180

good

wrong

ELECTRICAL ADJUSTMENTS

DECK SECTION

0 dB=0.775 V

1. Demagnetize the record/playback head with a head demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the parts adjust.

4. The adjustments should be performed with the rated power supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit adjustment.)

6. The adjustments should be performed for both L-CH and RCH.

7. Switches and controls should be set as follows unless otherwise specified.

• Test Tape

Tape Signal Used for

P-4-A100 10 kHz, –10 dB Azimuth Adjustment

WS-48B 3 kHz, 0 dB Tape Speed Adjustment

P-4-L300 315 Hz, 0 dB Level Adjustment

Record/Playback Head Azimuth Adjustment

DECK A DECK B

2. Turn the adjustment screw and check output peaks. If the peaks do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1dB of peak.

Output level

within 1dB

L-CH peak

R-CH peak

within 1dB

Screw position

L-CH peak

Screw position

R-CH peak

3. Mode: Playback

Note: Perform this adjustments for both decks

Procedure:

1. Mode: Playback

test tape P-4-A100 (10 kHz, –10 dB)

set

main board CN301

(L-CH)

Pin Pin

(R-CH)

main board CN301 Pin

(GND)

level meter

+ –

4. After the adjustments, apply suitable locking compound to the pats adjusted.

Adjustment Location:Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

— 21 —

Tape Speed Adjustment DECK B

Note: Start the Tape Speed adjustment as below after setting to the test

mode. In the test mode, the tape speed is high during pressing the HI-SPEED DUBBING button.

Procedure:

1. Turn the power switch on.

2. Press the p button, ENTER button and GROUP 3 button simultaneously. (The “VOLUME” on the fluorescent indicator tube will blink while in the test mode.) To exit from the test mode, press the I/u button.

Mode: Playback

REC Bias Adjustment

DECK B

Procedure:

INTRODUCTION When set to the test mode performed in T ape Speed Adjustment , when the tape is rewound after recording, the “REC memory mode” which rewinds only the recorded portion and playback is set. This “REC memory mode” is convenient for performing this adjustment. During recording, the input signal FUNCTION will automatically switch to VIDEO. (If do not operation of stopped from recording complete, after selecting DECK B with the FUNCTION button, and press ≠º – button then rewind to recording start position.)

test tape WS-48B (3 kHz, 0 dB)

set

main board CN301 (Pin

frequency counter

: L-CH)

: R-CH)

(Pin

+ –

1. Insert the WS-48B into the deck B.

2. Press the · button on the deck B.

3. Press the HI-SPEED DUBBING button in playback mode. Then at HIGH speed mode.

4. Adjust RV1001 on the LEAF SW board do that frequency counter reads 6,000 ± 180 Hz.

5. Press the HI-SPEED DUBBING button. Then back to NORMAL speed mode.

6. Adjust RV1002 on the LEAF SW board so that frequency counter reads 3,000 ± 90 Hz.

Adjustment Location: LEAF SW board

Sample Value of Wow and filter

W,RMS (JIS) within 0.3% (test tape: WS-48B)

Playback level Adjustment

DECK A DECK B

Procedure:

Mode: Playback

test tape P-4-L300 (315 Hz, 0 dB)

set

level meter

+ –

1. Press FUNCTION button to select VIDEO. (This step is not necessary if the above test mode has already been set.)

2. Insert a tape into deck B.

3. After press r REC button, press P PAUSE button, then recording start.

4. Mode: Record

MD/VIDEO (AUDIO) IN

1) 315 Hz

2) 10 kHz

AF OSC

attenuator



50 mV (–23.8 dB)

 

600

Ω

set

blank tape CN-123

5. Mode: Playback

recorded portion

set

CN301 (Pin

(Pin

3 1

: L-CH) : R-CH)

level mete

+ –

6. Confirm playback the signal recorded in step 3 become adjustable level as follows. If these levels do not adjustable level, adjustment the RV341 (L-CH) and R V441 (R-CH) on the AUDIO board to repeat steps 4 and 5.

Adjustable level: Playback output of 315 Hz to playback

output of 10 kHz: ±1.0 dB

Adjustment Location: AUDIO board

main board CN301 (Pin

(Pin

3 1

: L-CH) : R-CH)

Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301 (L-CH) and RV401 (R-CH) so that adjustment within adjustment level as follows.

Adjustment Level:

CN301 PB level: 301.5 to 338.3 mV (–8.2 to –7.2 dB) level difference between the channels: within ±0.5 dB Adjustment Location: AUDIO board

— 22 —

REC Level Adjustment

DECK B

Procedure:

1. Press FUNCTION button to select VIDEO. (This step is not necessary if the above test mode has already been set.)

2. Insert a tape into deck B.

3. After press r REC button, press P PAUSE button, then recording start.

4. Mode: Record

MD/VIDEO (AUDIO) IN

AF OSC

315 Hz, 50 mV (–23.8 dB)

attenuator

5. Mode: Playback

600

blank tape

Ω

set

CS-123

recorded portion

set

CN301 (Pin

(Pin

level mete

: L-CH)

: R-CH)

+ –

6. Confirm playback the signal recorded in step 3 become adjustable level as follows. If these levels do not adjustable level, adjustment the RV301 (L-CH) and R V351 (R-CH) on the MAIN board to repeat steps 4 and 5.

Adjustable level:

CN301 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB) Adjustment Location: MAIN board

[MAIN BOARD] (Component Side)

RV351

CN107

CN302

CN106

REC LEVEL

CN301

RV301

IC301

[AUDIO BOARD] (Component Side)

RV441

RV401

RV301

PB LEVEL

– DECK B –

[LEAF SW BOARD] (Component Side)

TAPE SPEED



(NORMAL) (HIGH)

RV1002



IC602

RV341



REC BIAS



RV1001

CN601

RV311

PB LEVEL

– DECK A –

CN1001

RV411



— 23 —

CD SECTION

Note :

1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10MΩ impedance.

4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

oscilloscope

BD board

TP (FE) TP (VC)

10. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.

11. Turn OFF the power, and remove the lead wire connected at step 7.

Note : A clear RF signal waveform means that the shape “◊” can be

clearly distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV : 200mV TIME/DIV : 500ns

level : 1.8 ± Vp-p

+0.3 –0.2

S Curve Check

Procedure :

1. Press the 1/u button to turn ON the power .

2. Open the front cover, and press the CD PLUS ONE button.

3. Set the disc (YEDS-18) into the “PLUS ONE” slit.

4. Close the front cover, and chuck the disc.

5. Press the 1/u button to turn OFF the power.

6. Connect the oscilloscope to TP (FE) of the BD board.

7. Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire.

8. Press the 1/u button to turn ON the power.

9. The first track will be played back automatically. When the CHECK button is pressed, “S JI” will be displayed on the fluorescent indicator tube, and focus search will be repeated.

10. Check the oscilloscope waveform (S-curve) is symmetrical

between A and B. And confirm peak to peak level within 1.8 ±

0.6 Vp-p.

S-curve waveform

symmetry

within 1.8 ± 0.6Vp-p

11. Turn OFF the power, and remove the lead wire connected at

step 7.

Note : • Try to measure several times to make sure than the ratio

of A : B or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the brightness to obtain best waveform.

RF Level Check

oscilloscope

BD board

TP (RF) TP (VC)

Procedure :

1. Press the 1/u button to turn ON the power.

2. Open the front cover, and press the CD PLUS ONE button.

3. Set the disc (YEDS-18) into the “PLUS ONE” slit.

4. Close the front cover, and chuck the disc.

5. Press the 1/u button to turn OFF the power.

6. Connect the oscilloscope to TP (RF) of the BD board.

7. Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire.

8. Press the 1/u button to turn ON the power.

9. Playback the fifth track of the disc.

— 24 —

E-F Balance (Traverse) Check

The procedure for this checking method differs for when a general remote control unit is used and not used.

oscilloscope

BD board

TP (TE) TP (VC)

When a general remote commander is used:

1. Press the 1/u button to turn ON the power.

2. Open the front cover, and press the CD PLUS ONE button.

3. Set the disc (YEDS-18) into the “PLUS ONE” slit.

4. Close the front cover, and chuck the disc.

5. Press the 1/u button to turn OFF the power.

6. Connect the oscilloscope to TP (TE) of the BD board.

7. Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire.

8. Press the 1/u button to turn ON the power.

9. Playback the fifth track of the disc.

10. Press the 3 button on the remote commander. (The tracking

servo and the sledding servo are turned OFF.)

11. Check the level B of the oscilliscope's waveform and the A (DC

voltage) of the center of the Traverse waveform. Confirm the following : A/B x 100 = less than ± 10%

Traverse waveform

Center of the waveform

A (DC voltage)

level : 0.7 ± 0.3 Vp-p

12. Press the 8 button on the remote control unit. (The tracking

servo and sledding servo are turned ON.) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 11.

Traverse waveform

Tracking servo Sled servo

OFF

Tracking servo Sled servo

C (DC voltage)

13. Turn OFF the power, and remove the lead wire connected at

step 7.

+ 56 hidden pages