Sony HCD-DX20, HCD-RG30 Service manual

HCD-DX20/RG30

SERVICE MANUAL

Ver 1.0 2001.06

• HCD-DX20/RG30 is the tuner, deck, CD and amplifier section in MHC-DX20/RG30.

Photo: HCD-DX20

CD CD Mechanism Type CDM58B-K6BD38

Section Base Unit Name BU-K6BD38

Tape deck

Section

AEP Model

UK Model

HCD-RG30

E Model

HCD-DX20

Model Name Using Similar Mechanism HCD-DX30/RG40

Optical Pick-up Name KSM-213DCP

Model Name Using Similar Mechanism NEW

SPECIFICATIONS

Amplifier section

European models: HCD-RG30:

DIN power output (rated) 50 + 50 watts (6 ohms at 1 kHz, DIN) Continuous RMS power output (reference)

60 + 60 watts (6 ohms at 1 kHz, 10% THD)

Music power output (reference)

115 + 115 watts (6 ohms at 1 kHz, 10% THD)

Other models: HCD-DX20:

The following measured at AC 120, 220, 240 V 50/60 Hz DIN power output (rated) 50 + 50 watts (6 ohms at 1 kHz, DIN) Continuous RMS power output (reference)

60 + 60 watts (6 ohms at 1 kHz, 10% THD) Inputs MD/VIDEO (AUDIO) IN (phono jacks):

voltage 450/250 mV, impedance 47 kilohms GAME (AUDIO) IN (phono jacks):

voltage 450 mV, impedance 47 kilohms MIC (mini jack): sensitivity 1 mV, impedance 10 kilohms Outputs PHONES (stereo mini jack):

accepts headphones of 8 ohms or more

SPEAKER: accepts impedance of 6 to 16 ohms

CD player section

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

Emission duration: continuous

Laser output Max. 44.6 µW*

* 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 2 Hz – 20 kHz (±0.5 dB) Wavelength 780 – 790 nm Signal-to-noise ratio More than 90 dB Dynamic range More than 90 dB CD OPTICAL DIGITAL OUT (Square optical connector jack, rear panel) Wavelength 660 nm Output Level –18 dBm

— Continued on next page —

9-873-858-11

2001F0200-1

MINI HIFI COMPONENT SYSTEM

Sony Corporation

Home Audio Company

Shinagawa Tec Service Manual Production Group

HCD-DX20/RG30

Tape deck section

Recording system 4-track 2-channel stereo Frequency response 40 – 13,000 Hz (±3 dB), using Sony TYPE I

cassette

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

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

AM tuner section

Tuning range European and Middle Eastern models:

531 – 1,602 kHz (with the interval set at 9 kHz)

Other models: 531 – 1,602 kHz (with the interval set at 9 kHz)

530 – 1,710 kHz (with the interval set at 10 kHz) Antenna AM loop antenna Antenna terminals External antenna terminal Intermediate frequency 450 kHz

General

Power requirements European models: 230 V AC, 50/60 Hz Mexican models: 120 V AC, 50/60 Hz Other models: 120 V, 220 V or 230 – 240 V AC, 50/60 Hz

Adjustable with voltage selector

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.

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

Power consumption European models: 110 watts

0.5 watts (at the Power Saving Mode)

Other models: 110 watts

Dimensions (w/h/d) Approx. 280 x 325 x 421 mm

Mass European models: Approx. 8.5 kg Other models: Approx. 8.5 kg

Supplied accessories: AM loop antenna (1)

Remote Commander (1)

Batteries (2)

FM lead antenna (1)

Front speaker pads (8)

Design and specifications are subject to change without notice.

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

CAUTION

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

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 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.

HCD-DX20/RG30

TABLE OF CONTENTS MODEL IDENTIFICATION

1. SERVICE NOTE .............................................................. 4

2. GENERAL ......................................................................... 5

3. DISASSEMBY ................................................................. 7

4. TEST MODE................................................................... 13

5. ELECTRICAL ADJUSTMENTS .............................. 17

6. DIAGRAMS

6-1. Circuit Board Location ..................................................... 19

6-2. Block Diagrams –Tuner Section– ................................... 20

Block Diagrams –Main Section– .................................... 21

6-3. Printed Wiring Board –BD Section– ............................... 22

6-4. Schematic Diagram –BD Section– .................................. 23

6-5. Printed Wiring Board –Main Section– ............................ 24

6-6. Schematic Diagram –Main Section (1/5) – ..................... 25

6-7. Schematic Diagram –Main Section (2/5) – ..................... 26

6-8. Schematic Diagram –Main Section (3/5) – ..................... 27

6-9. Schematic Diagram –Main Section (4/5) – ..................... 28

6-10. Schematic Diagram –Main Section (5/5) – ..................... 29

6-11. Printed Wiring Board –Power AMP Section– ................. 30

6-12. Schematic Diagram –Power AMP Section– ..................... 31

6-13. Printed Wiring Board –Panel Section– ............................ 32

6-14. Schematic Diagram –Panel Section– ............................... 33

6-15. Printed Wiring Board –Trans Section– ............................ 34

6-16. Schematic Diagram –Trans Section– ............................... 35

6-17. Printed Wiring Board –Driver Section– ........................... 36

6-18. Schematic Diagram –Driver Section– .............................. 36

6-19. IC Pin Function Description ............................................. 37

6-20. IC Block Diagrams ............................................................ 40

7. EXPLODED VIEWS

7-1. Main Section..................................................................... 43

7-2. Front Panel Section .......................................................... 44

7-3. Chassis Section ................................................................. 45

7-4. CD Mechanism Deck Section .......................................... 46

— BACK PANEL —

PARTS No.

MODEL

RG30

DX20: E2, E51, EA, SP, AR models

DX20: KR, MX, TH models

• Abbreviation EA : Saudi Arabia model SP : Singapore model TH : Thai model KR : Korea model MX : Mexican model AR : Argentina model E51 : Chiri and Peru model E2 : Central and South America model

PARTS No.

4-234-032-2s

4-234-091-0s

4-234-091-6s

8. ELECTRICAL PARTS LIST ...................................... 47

HCD-DX20/RG30

SECTION 1

SERVICE NOTE

REMOVING THE PANEL BOARD AND THE KEY BOARD

* The panel board and the key board only are connected to the front panel by means of hot-melting the plastics.

Panel board

Connector

13p (CN712)

Key boar

Cut the seven melted-connection points

with a cutting plier.

Note for installing the panel board and the key board

Panel board (ten screw holes)

Cut the six melted-connection points

with a cutting plier.

Key board (eight screw holes)

Screw hole

In order to re-install the panel board and the key board, fix them by using the screws (+BVTP 2.6 Screw in to the respective screw holes. Do not tighten the screws excessively.

8 ) respectively.

Hot melt

Main unit

1234 6589q;qaqs7

ef ed es ea e;

HCD-DX20/RG30

SECTION 2

GENERAL

This section is extracted from instruction manual.

qd qf qg

qh qj

AUDIO jacks ed CD qs CD SYNC wf Deck A wl Deck B w; DIRECTION* DISC 1 – 3 wa DISC SKIP EX-CHANGE ea Disc tray 8 DISPLAY 7 EDIT 7 EFFECT ON/OFF 4 ENTER 0 GAME eg GAME EQ 2 GROOVE 3 KARAOKE PON*

MD (VIDEO) qg MIC jack* MIC LEVEL co ntrol * MOVIE EQ 9 MUSIC EQ 6 P FILE qa PHONES jack qk PLAY MODE 7 PTY/DIRECTION 7 REC PAUSE/START wd REPEAT 7 SPECTRUM 7 STEREO/MONO 7 TAPE A/B qf TUNER MEMORY 7 TUNER/BAND qd VIDEO jack ef VOLUME control qh

wawswdwfwgwhwj wk

BUTTON DESCRIPTIONS

v/V/b/B 5 Z (deck A) wk Z (deck B) ql M (fast forward) ws . (go back) wg Z OPEN/CLOSE qj ?/1 (power) 1 x (stop) wg nN (play) wg X (pause) wg > (go forward) wg m (rewind) wh

PTY/DIRECTION for European model

HCD-DX30 only

HCD-DX20/RG30

Remote Control

qk qj qh qg

qf qd

12 34

8 9 0

CD qj CLEAR 6 CLOCK/TIMER SELECT 2 CLOCK/TIMER SET 3 D.SKIP ql EFFECT ON/OFF qa ENTER qf GAME qk

MD (VIDEO) 9 P FILE qd PRESET EQ qg SLEEP 1 SURROUND 0 TAPE A/B 8 TUNER/BAND qh VOL +/– 7

Setting the time

1 Turn on the system. 2 Press CLOCK/TIMER SET on the

remote.

Proceed to step 5 when “CLOCK” appears in the display.

3 Press v or V repeatedly to select “SET

CLOCK”.

4 Press ENTER. 5 Press v or V repeatedly to set the hour.

BUTTON DESCRIPTIONS

v/V/b/B qs M (fast forward)/TUNING

+ 5

(go back)/PRESET

– 5

?/1 (power) 4 x (stop) 5 nN (play) 5 X (pause) 5

(go forward)/PRESET

+ 5

m (rewind)/TUNING – 5

6 Press B.

The minute indication flashes.

7 Press v or V repeatedly to set the

minute.

8 Press ENTER.

Tip

If you made a mistake or want to change the time, start over from step 1.

Note

The clock settings are canceled when you disconnect the power cord or if a power failure occurs.

Note : Disassemble the unit in the order as shown below.

)

Case (Side-R, Side-L, Top)

Set

CD door

HCD-DX20/RG30

SECTION 3

DISASSEMBLY

Front panel section

CD mechanism deck (CDM58B)

Chassis section

Base unit, BD board

Driver board, Moter board, Address sensor board

Sub trans board, Video out board, Back panel, Power transformer (Trans board)

Main board, Power amp board

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

3-1. CASE (SIDE-R, SIDE-L, TOP)

Case (Top)

Key boardPanel boardTape mechanism deck

Four screws (+BVTP 3

10)

Two screws (Case 3 TP2)

Screw (Case 3 TP2)

(+BVTT 3

Case (Side-L)

Screw

(+BVTP 3

10)

Case (Side-R)

Two screws

(Case 3 TP2)

Screw (Case 3 TP2)

Screw

(+BVTP 3

Screw

(+BVTT 3

HCD-DX20/RG30

3-2. CD DDOR

CD mechanism deck (CDM58B)

Turn the pulley to the direction of arrow.

pulley

Front panel side

Pull-out the disc tray.

CD door

3-3. FRONT PANEL SECTION

CD mechanism deck (CDM58B)

Connector

(CN701)

Screw (+BVTP 3

10)

Wire (flat type)(CN2)

Screw

(+BVTP 3

(CN714)

Wire (flat type)

(CN102)

10)

Screw

(+BVTP 3

Connector (A Deck)

Connector

10)

Chassis section

Connector (B Deck)

Front panel section

Three screws (+BVTP 3

× 6

)

3-4. TAPE MECHANISM DECK

)

Tape mechanism deck

HCD-DX20/RG30

Six

screws

(+BVTP 2.6

3-5. PANEL BOARD

Volume knob

Vol knob ring

Panel board

Connector

(CN712)

Cut the seven melted-connection points with a cutting plier.

Note: When attching the panel board, refer to "Service Note" on page 4.

HCD-DX20/RG30

)

3-6. KEY BOARD

Key board

Cut the six melted-connection points with a cutting plier.

Note: When attching the Key board, refer to "Service Note" on page 4.

3-7. SUB TRANS BOARD, VIDEO OUT BOARD, BACK PANEL, POWER TRANSFORMER (TRANS BOARD)

Video out board

Cover (Duct)

Connector (CN915)

Trans board

(CN901)

(CN903)

Sub trans

board

Two screws

(+BVTT 4

Connector

Connector (CN2)

Tw o

screws

(+BVTP 3

10)

Back panel

Screw (+BVTP 3

Two screws

(+BVTP 3

10)

Five screws

(+BVTP 3

Two screws

(+BVTT 3

Two screws

(+BVTT 4

Powe r

(T911)

transformer

3-8. MAIN BOARD, POWER AMP BOARD

Two screws (+BVTT 3

Three screws (+BVTT 3

Power amp

Two screws (+BVTP 3

board

16)

HCD-DX20/RG30

Heat sink

Main board

Main boar

3-9. BASE UNIT, BD BOARD

Two insulators

Two stoppers (BU)

Holder (BU) assy

Base unit

Two screws (+BVTT 3

Screw (+PTPWH M2.6)

Screw (DIA. 12)

Two insulators

Tw o

screws (+PTPWH M2.6)

Two screws (+BVTP 2.6

BD board

Screw (+BVTP 2.6

Wire (flat type) 16p (CN102)

Wire (flat type) 19p (CN101)

HCD-DX20/RG30

3-10. DRIVER BOARD, MOTOR BOARD AND ADDRESS SENSOR BOARD

Tray

Wire (flat type)

8p (CN702)

Driver board

Screw (+PTPWH 2.6

Screw (+BVTP 2.6

Motor board

Two screws (+BVTP 2.6

Wire (flat type) 8p (CN721)

Remove the two solderings of motor.

Address sensor board

Connector 4p (CN722)

Screw (+BVTP 2.6

Pull-out the disc tray.

SECTION 4

TEST MODE

HCD-DX20/RG30

[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 three buttons x , ENTER , and ?/1 simultaneously.

2. The fluorescent indicator tube displays “COLD RESET” and

the set is reset.

[CD Ship Mode]

• This mode moves the pickup to the position durable to vibration. Use this mode when returning the set to the customer after repair.

Procedure:

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

2. Press CD button and 1/u button simultaneously until

“STANDBY” appears.

3. When you releaset he buttons, a message “LOCK” is displayed

on the fluorescent indicator tube, and the CD ship mode is set.

[MC Hot Reset]

• This mode resets the set with the preset data kept stored in the memory. The hot reset mode functions same as if the power cord is plugged in and out.

Procedure:

Press three buttons x , ENTER , and DISPLAY simultaneously.

2. The fluorescent indicator tube becomes blank instantaneously,

and the set is reset.

[CD Service Mode]

• This mode can run the CD sled motor freely. Use this mode, for instance, when cleaning the pickup.

Procedure:

1. Press ?/1 button to turn the set ON.

2. Select the function “CD”.

3. Press three buttons x , ENTER , and OPEN/CLOSE simul-

taneously.

4. The CD service mode is selected.

5. With the CD in stop status, continue to press > to move the

pickup to outside track, continue to press . to inside track.

6. To exit from this mode, perform as follows:

1) Move the pickup to the most inside track.

2) Press three buttons in the same manner as step 2.

Note: • Always move the pickup to most inside track when exiting from

this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can be chipped.

[Change-over of AM Tuner Step between 9 kHz and 10 kHz]

• A step of AM channels can be changed over between 9 kHz and 10 kHz.

Procedure:

1. Press ?/1 button to turn the set ON.

2. Select the function “TUNER”, and press TUNER/BAND

button to select the BAND “AM”.

3. Press ?/1 button to turn the set OFF.

4. Press ENTER and ?/1 buttons simultaneously, and the display

of fluorescent indicator tube changes to “AM 9 k STEP” or “AM 10 k STEP”, and thus the channel step is changed over.

[GC Test Mode]

• This mode is used to check the software version, FL tube, LED, keyboard, headphone and volume.

Procedure:

1. Press three buttons x , ENTER and DISC 2 simultaneously.

2. LEDs and fluorescent indicator tube are all turned on.

3. When ENTER and DISC2 are pressed at the same time, the

key number check mode starts up. In this mode, the key numbers of each key series are displayed.

4. In the key check mode, the fluorescent indicator tube displays

“KEY 000”. Each time a button is pressed.

5. When ENTER and DISC2 are pressed at the same time, the

key count check mode starts up. In this mode, the message “KEY CNT @@” is displayed on the FL display tube. When each button is pressed, the key row number is incremented first. Then the key value is then incremented. However, one the button is pressed, the key value cannot be counted.

6. When ENTER and DISC2 are pressed at the same time, the

headphones check mode starts up. In this mode, the message “H_P ON” is displayed when the headphones are inserted. When the headphones are not inserted. the message “H_P OFF” is displayed.

7. When ENTER and DISC2 are pressed at the same time, the

volume check mode starts up. In this mode, the message “VOLUME FLAT” is displayed on the FL display tube. When the volume control knob is rotated in the positive (+) direction, the message “VOLUME UP” is displayed. When the volume control knob is rotated in the negative (-) direction, the message “VOLUME DOWN” is displayed.

8. In order to quit the mode, either press ENTER and DISC2 at

the same time or press the three buttons at the same time as in step 1.

9. To exit from this mode, press three buttons in the same manner

as step 1, or disconnect the power cord.

HCD-DX20/RG30

[MC Test Mode]

• This mode is used to check operations of the respective sections of Amplifier, TUNER, CD and Tape.

Procedure:

1. Press the ?/1 button to turn on the set.

2. Press the three buttons of x , ENTER and DISC 3

simultaneously.

3. A message “TEST MODE” appears on the FL display tube.

• The messages VACS1 to VACS5 are displayed when the VACS is changed in this mode.

• The number of repeats of TAPE and CD is set to the infinite number as the default setting.

4 When v (CURSOR UP) button is pressed, GEQ increases to

its maximum and a message “GEQ MAX” appears.

5. When V (CURSOR DOWN) button is pressed, GEQ decreases

to its minimum and a message “GEQ MIN” appears.

6. When b (CURSOR LEFT) or B (CURSOR RIGHT) button

is pressed, GEQ is set to flat and a message “GEQ FLAT” appears.

7. In the test mode, the default-preset channel is called even when the TUNER is selected and an attempt is made to call the preset channel that has been stored in memory, by operating the Shuttle knob. (It means that the memory is cleared.)

8. When a tape is inserted in the Deck B and the TAPE B function is selected, and when the REC PAUSE/START button is pressed twice, recording starts. The VIDEO function is selected automatically as the input source.

9. Select the desired loop by pressing the PLAY MODE button in the TAPE B function. Insert a test tape AMS-110A or AMSRO to Deck A.

10. Press the SPECTRUM button to enter the AMS test mode.

11. After a tape is rewound first, the FF AMS is checked, and the mechanism is shut off after detecting the AMS signal twice.

12. Then the REW AMS is checked and the mechanism is shut off after detecting the AMS signal twice.

13. When the check is complete, a message of either OK or NG appears.

14. When the two buttons of SPECTRUM and DISC1 are pressed at the same time in any function modes, either the “VACS ON” display to enable the VACS function or the “VACS OFF” display to disable the VACS function can be selected.

15. When you want to exit this mode, press the ?/1 button twice. The cold reset is enforced at the same time.

[Microprocessor version display]

• If the following operation is performed during the POWER OFF in the modes other than the POWER SAVE mode (i.e., while the Demo display shows the watch time),

1. When three buttons of STOP , ENTER , V (CUSOR DOWN)

are pressed at the same time, the MC and the GC microprocessor version numbers are displayed as “M1.00 G1.00”.

2. When three buttons of STOP , ENTER , v (CUSOR UP) are

pressed at the same time, the model name and destination are displayed as “BG1 AS1A3”.

[Aging Mode]

This mode can be used for operation check of CD section and tape deck section.

• If an error occurred: The aging operation stops and display status.

• If no error occurs: The aging operation continues repeatedly.

1. Operating method of Aging Mode

Turn on the main power and select “CD” of the function.

1) Set a disc in DISC1 tray. Select ALL DISC CONTINUE, and REPEAT OFF.

2) Load the tapes recording use into the decks A and B respectively.

3) Press three buttons x , ENTER , and

DISC SKIP EX-CHANGE simultaneously.

4) Aging operations of CD and tape are started at the same time.

5) To exit the aging mode, perform [MC Cold Reset].

3. Aging Mode in CD section

1) Display state

• No error occurs

Display

AGING[*][*][*][*]

HCD-DX20/RG30

Note:

[*][*][*][*]

Error display

E ** s ## $$ %%

1234 5

1 **

2 s 3 ##

4 $$

5 %%

: Number of aging operations

The error No. 00 indicates the newest error. As the error No. increases, it means the older error. When you want to retrieve the error history, press the PLAY MODE button in the case of mechanism error. Or press the REPEAT button in the case of NO DISC error.

M: Mechanism error

Don’t care

High order digits only D: Stopped during closing due to problems other than mechanism. E: Stopped during opening due to problems other than mechanism. C: Stopped during chucking due to problems other than mechanism. F: Stopped during EX-opening due to problems other than mechanism.

Emergency related errors (High order digits only) 1: Stopped during chuck-up 2: Stopped during chuck-down 3: Time out by EX-OPEN 5: Time out by EX-CLOSE

D: No disc error

01: FOCUS ERROR 02: GFS ERROR 03: SETUP ERROR

01: NO DISC judgment without chucking retry 02: NO DISC judgment after chucking retry

Status at the time of NO DISC judgment (High order digits only) 1: STOP 2: SETUP 3: TOC READ 4: ACCESS 5: PLAY BACK 6: PAUSE 7: MANUAL SEARCH (PLAY) 8: MANUAL SEARCH (PAUSE)

• When the buttons x , ENTER and DISC 1 are pressed simultaneously, number of time of the mechanism error and the NO DISC error can be checked. Display: EMC**EDC** **: Number of times of error (Maximum three times)

EMC: Mechanism error EDC: NO DISC error

• When aging operation is complete, be sure to perform the MC Cold Reset to reset the error history.

HCD-DX20/RG30

2) Operation during aging mode In the aging mode, the program is executed in the following sequence. (1) The disc tray opens and closes. (2) The mechanism accesses DISC 2 and makes an attempt to

read TOC. However, since there are no discs, a message “CD2 NO DISC” appears.

(3) The mechanism accesses DISC 3 and a message “CD3 NO

DISC” appears. (4) The disc tray turns to select a disc1. (5) A disc is chucked. (6) TOC of disc is read. (7) The pickup accesses to the track 1, and playing 2 seconds. (8) The pickup accesses to the last track, and playing 2 seconds. (9) Every time when an aging operation of step 1 to step 8 is

complete, the display “AGING[*][*][*][*]” value increases

as the number of aging operations is counted up. (10) Returns to step 1.

3. Aging Mode in Tape Deck section

1) Display state

• No error occurs

Display action now

• Error occurred

Display action last time

NO. Display action Action contents Final timing

TAPE A AG-6 Rewind the TAPE A

TAPE B AG-1 Rewind the TAPE B

2 TAPE A AG-2 FWD play the TAPE A 2 minutes playing

3 TAPE A AG-3 F.F. the TAPE A

4 TAPE A AG-4 REV play the TAPE A 2 minutes playing

5 TAPE A AG-5 Rewind the TAPE A The top of tape

6 TAPE B AG-2 FWD play the TAPE B 2 minutes playing

7 TAPE B AG-3 F.F. the TAPE B

8 TAPE B AG-4 REV play the TAPE B 2 minutes playing

9 TAPE B AG-5 Rewind the TAPE B The top of tape

The top of tape

20 second FF or the end of tape

2) Operation during aging mode In the aging mode, the program is executed in the following sequence. (1) Rewind is executed up to the top of tape A and B. (2) A tape on FWD side is played for 2 minutes. (3) FF is executed up to either made for 20 second or the end of

tape.

(4) B tape is reversed, and the tape on REV side is played for 2

minutes. (5) Rewind is executed up to the top of tape. (6) Returns to step 2, and repeat steps from 2 to 5.

[Function Change Mode]

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

Procedure:

1. Turn on the power.

2. Press the two buttons MD (VIDEO) and ?/1 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”.

SECTION 5

ELECTRICAL ADJUSTMENTS

HCD-DX20/RG30

FM Tuned Level Adjustment

FM RF Signalgenerator

Ω

coaxial

set

Carrier frequency : 98 MHz Modulation : AUDIO 1 kHz, 75 kHz deviation (100%) Output level : 28 dB (at 75

Ω

open)

FM ANTENNA terminal (TM101)

Procedure:

1. Supply a 98 MHz signal at 28 dB from the ANTENNA terminal.

2. Tune the set to 98 MHz.

3. Adjust RV101 to the point (moment) when the TUNED indicator will change from going off to going on.

Adjustment Location: MAIN board

Null Adjustment

FM RF Signalgenerator

Ω

coaxial

set

Carrier frequency : 98 MHz Modulation : AUDIO 1 kHz, 75 kHz deviation (100%) Output level : 60 dB (at 75

Ω

open)

FM ANTENNA terminal (TM101)

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.

S-Curve Check

Oscilloscope

BD board

TP(FEO) TP(VC)

Procedure :

1. Connect oscilloscope to TP (FEO).

2. Connect between TP (FEI) and TP (VC) by lead wire.

3. Connect between TP (AGCCON) and TP (D GND) by lead wire.

4. Turn Power switch on.

5. Load a disc (YEDS-18) and actuate the focus search. (In consequence of open and close the disc tray, actuate the focus search)

6. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 4 ±1 Vp-p.

S-curve waveform

symmetry

Procedure:

1. Supply a 98 MHz signal at 60 dB from the ANTENNA terminal.

2. Tune the set to 98 MHz.

3. Measure voltage between pin 21 and pin 23 of IC 101. Adjust T101 ubtil the voltage becomes 0 V.

Adjustment Location: MAIN board

Adjustment Location

[MAIN BOARD] Component side

T101:NULL

T101

IFT101

RV101

T102

RV101:FM TUNED LEVEL

RV661:TAPE SPEED

RV661

within 4 ±1Vp-p

7. After check, remove the lead wire connected in step 2 and 3.

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. Connect oscilloscope to TP (RF).

2. Connect between TP (AGCCON) and TP (D GND) by lead wire.

3. Turned Power switch on.

4. Load a disc (YEDS-18) and playback.

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

6. After check, remove the lead wire connected in step 2.

HCD-DX20/RG30

)

Note : 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 : 1.45 ± 0.3Vp-p

E-F Balance (1 Track jump) Check

oscilloscop

BD board

TP(TEO) TP(VC)

Procedure :

1. Connect oscilloscope to TP (TEO) and TP (VC).

2. Turned Power switch on.

3. Load a disc (YEDS-18) and playback the number five track.

4. Press the gG button. (Becomes the 1 track jump mode.)

5. Confirm that the level B and A (DC voltage) on the oscilloscope waveform.

1 track jump waveform

center of waveform

Adjustment Location:

[BD BOARD] (Conductor Side)

(AGCCON)

IC103

(RF)

(FEI)

(TEO)

(FEO)

(VC)

(XPCK)

2021

IC101

(DGND)

level=1.3±0.6Vp-p

Specified level: –– × 100=less than ±22%

A B

symmetry

A (DC voltage

6. After check, remove the lead wire connected in step 1.

RF PLL Free-run Frequency Check

Procedure :

1. Connect frequency counter to test point (XPCK) with lead wire.

BD board

TP (XPCK)

frequency counte

2. Turned Power switch on.

3. Put the disc (YEDS-18) in to play the number five track. Confirm that reading on frequency counter is 4.3218MHz.

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