Sony HCD-RG444 Service Manual

HCD-RG444

SERVICE MANUAL

Ver 1.0 2004.05

• HCD-RG444 is the tuner, deck, CD and
amplifier section in MHC-RG444S.

CD
Section

Tape deck Model Name Using Similar Mechanism HCD-RG222
Section T ape Transport Mechanism T ype CWM43FF-05

AEP Model

Model Name Using Similar Mechanism HCD-RG222
CD Mechanism Type CDM74-F1BD81
Optical Pick-up Name

KSM-215DCP/C2NP

Amplifier section

Front speaker
DIN power output (rated): 100 + 100 watts (6 ohms at

1kHz, DIN)

Continuous RMS power output (reference):

120 + 120 watts (6 ohms at
1kHz, 10% THD)

Music power output (reference):

240 + 240 watts (6 ohms at

1kHz, 10% THD)
Sub woofer
DIN power output (rated): 100 watts (6 ohms at

60 Hz, DIN)
Continuous RMS power output (reference):

120 watts (6 ohms at

50 Hz, 10% THD)
Music power output (reference):

240 watts (6 ohms at

50 Hz, 10% THD)
Inputs

GAME INPUT AUDIO L/R (phono jacks):

voltage 250 mV,

impedance 47 kilohms
GAME INPUT VIDEO (phono jack):

1Vp-p, 75 ohms

SPECIFICATIONS

Outputs
PHONES (stereo mini jack):

VIDEO OUT (phono jack):

SPEAKER: accepts impedance of 6 to

SUB WOOFER OUT:

CD player section

System Compact disc and dig ital

Laser Semiconductor laser

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

accepts headphones of
8 ohms or more

max. output level 1Vp-p,
unbalanced, Sync
negative, load impedance
75 ohms

16 ohms
accepts impedance of 6 to
16 ohms

audio system

(λ=780 nm)
Emission duration:
continuous

Tape deck section

Recording system 4-track 2-channel, stereo
Frequency response 50 – 13,000 Hz (±3 dB),

Tuner section

FM stereo, FM/AM super he ter odyne tuner

FM tuner section

Tuning range

Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz

AM tuner section

Tuning range

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

– Continued on next page –

using Sony TYPE I
cassettes

87.5 – 108.0 MHz
(50-kHz step)

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

9-877-899-01

2004E1678-1
© 2004.05

MINI HI-FI COMPONENT SYSTEM

Sony Corporation

Home Audio Company
Published by Sony Engineering Corporation

HCD-RG444

General

Power requirements
Power consumption

Dimensions (w/h/d) incl. projecting parts and controls
Amplifier/Tuner/Tape/CD section:

Mass

Design and specifications are subject to change
without notice.

:

230 V AC, 50/60 Hz

:

275 watts

0.25 watts (at the Pow er
Saving Mode)

Approx. 280 × 327 ×
425 mm
Approx. 10.0 kg

The release method of a CD disc tray LOCK function

There is a disc lock function for the disc theft prevention for a
demonstration at a shop front in this machine.
Procedue:

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

2. Press two buttons of x and Z (EJECT) simultaneously for
five seconds.

3. The message “LOCKED” is displayed and the tray is locked.
(Even if exiting from this mode, the tray is still locked.)

4. Press two buttons of x and Z (EJECT) simultaneously for
five seconds again.

5. The message “UNLOCKED” is displayed and the tray is
unlocked.

6. T o exit from this mode, press the ?/1 button to turn the set
off.

Unleaded solder

Boards requiring use of unleaded solder are printed with the lead­free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

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.

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.

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.

• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED 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
PUBLISHED BY SONY .

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.

2

TABLE OF CONTENTS

1. SERVICING NOTE·························································· 4

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

3. DISASSEMBLY

3-1. Cover (Top) ··································································· 8
3-2. CD Door ········································································8
3-3. Front Panel Section ······················································· 9
3-4. CD Mechanism Deck (CDM74-F1BD81) ···················· 9
3-5. Tape Mechanism Deck, Game Jack Board·················· 10
3-6. PANEL Board······························································10
3-7. Back Panel Section, SUB-TRANS Board ··················· 11
3-8. Power Transformer ····················································· 11
3-9. MAIN Board ······························································· 12
3-10.SUB-WOOFER Board ················································12
3-11.AMP Board ································································· 13
3-12.BD81A Board······························································ 13
3-13.CONNECT Board ·······················································14
3-14.DRIVER Board, SW Board········································· 14
3-15.Optical Pick-up (KSM-215DCP/C2NP) ····················· 15
3-16.SENSOR Board ··························································· 15
3-17.MOTOR (TB) Board ··················································· 16
3-18.MOTOR (LD) Board ···················································16

HCD-RG444

4. TEST MODE ···································································· 17

5. MECHANICAL ADJUSTMENTS ····························· 20

6. ELECTRICAL ADJUSTMENTS ······························ 20

7. DIAGRAMS

7-1. Block Diagrams – PANEL Section – ························· 26

– MAIN Section – ·······················································27
– BD/DRIVER Section – ············································ 28

– SUB-WOOFER Section – ········································ 29
7-2. Printed Wiring Board – BD81A Section – ················· 30
7-3. Schematic Diagram – BD81A Section – ···················· 31
7-4. Printed Wiring Board

– CD MECHANISM Section – ··································· 32
7-5. Schematic Diagram – CD MECHANISM Section – ····· 33
7-6. Printed Wiring Board – MAIN Section –··················· 34
7-7. Schematic Diagram – MAIN Section (1/2) – ············· 35
7-8. Schematic Diagram – MAIN Section (2/2) – ············· 36
7-9. Printed Wiring Board – PANEL COMB Section – ···· 37
7-10.Schematic Diagram – PANEL COMB Section – ······· 38
7-11.Printed Wiring Board – SUB-WOOFER Section –···· 39
7-12.Schematic Diagram – SUB-WOOFER Section – ······40
7-13.Printed Wiring Board – PANEL Section – ················· 41
7-14.Schematic Diagram – PANEL Section (1/2) – ··········· 42
7-15.Schematic Diagram – PANEL Section (2/2) – ··········· 43
7-16.Printed Wiring Board – TRANS Section –················· 44
7-17.Printed Wiring Board – AMP Section – ····················· 45
7-18.Schematic Diagram – AMP POWER Section – ········· 46

8. EXPLODED VIEWS

8-1. MAIN Section ····························································· 55
8-2. Front Panel Section ····················································· 56
8-3. MAIN Board Section ·················································· 57
8-4. CD Mechanism Deck Section -1 (CDM74-F1BD81) ···· 58
8-5. CD Mechanism Deck Section -2 (CDM74-F1BD81) ···· 59

9. ELECTRICAL PARTS LIST ······································· 60

3

HCD-RG444

k

• SERVICE POSITION -1 (AMP BOARD)

To inspect the AMP board, turn both of the front panel
and the CD mechanism deck so that the left side of the product faces down.

CD mechanism deck

SECTION 1

SERVICING NOTE

front panel

AMP board

• SERVICE POSITION -2 (BD81A BOARD)

Remove the CD mechanism deck and place it on top of the pedestal as shown.
Inspect the BD81A board in this set up.

BD81A board

CD mechanism dec

4

SECTION 2

Illustrati

GENERAL

List of button locations and reference pages

HCD-RG444

This section is extracted
from instruction manual.

How to use this page

Use this page to find the loca tio n of buttons and other
parts of the system that are mentioned in the text.

Main unit

ALPHABETICAL ORDER

A – O P – Z

ALBUM +
ALBUM –
CD eg (9, 11, 14, 19, 20)
CD SYNC wj (19)
Deck A wk (18)
Deck B qj (18, 19, 20, 24)
DISC 1 – 3 q; (12, 14, 35)
DISC SKIP/EX-CHANGE qs

Disc tray 9 (11)
DISPLAY 2 (17, 27, 28)
Display window 5
EFFECT ON/OFF 8 (22)
ENTER qa (14, 15 , 22)
EQ BAND 7 (22)
GAME es (20, 23, 30)
GAME INPUT AUDIO L/R jacks

GAME INPUT VIDEO jack wf

GAME MIXING wh (23)
GROOVE 8 (21)
ILLUMINATION
Operation Dial

qh (12, 14, 19)
wg (12, 14, 19)

(11, 12, 14, 19)

wd (20, 29)

(29)

3 (28)

(– EQ +/l L) 6 (12,
14, 19, 22)

P FILE qd (22)
PHONES jack ql
PLAY MODE wl (12, 14, 18, 19,

20, 35)
Power illuminator qk (28)
PRESET EQ qd (22)
REC PAUSE/START wj (19, 20,

23, 24)
Remote sensor 4
SURROUND 8 (23)
TAPE A/B ed (18, 19, 20, 24)
TUNER/BAND ef (15, 16, 20)
TUNING MODE wl (15, 16, 35)
TUNING + qh (15, 16)
TUNING – wg (15, 16)
VOLUME control w; (21)

12345 6 78 9

eg
ef
ed
es

e;
wl
wk
wj

on number

r

TAPE A/B ed (18, 19, 20, 24)

Name of button/pa rt Reference page

RR

BUTTON DESCRIPTIONS

?/1 (power) 1 (8, 16, 27, 30, 33,

35)

X (pause) wg (12, 19)
Z (eject) qf (11)
PUSH Z (deck B) (eject) qg (18)
x (stop) wg (12, 19, 24, 35)
M (fast forward) qh (12, 19)
H (play) qh (12, 18, 19)
m (rewind) wg (12, 19)
Z PUSH (deck A) (eject) e; (18)

q;

qa

j

ALBUM

S

s

TUNING TUNING

J

ALBUM

H

h

qs
qd
qf
qg
qh
qj
qk

ql

wh

wfwg

wd

w;

5

HCD-RG444

Remote control

ALPHABETICAL ORDER

A – E

ALBUM – qd (12, 14)
ALBUM + qa (12, 14)
CD qk (11, 14)
CLEAR qg (14)
CLOCK/TIMER SELECT 2

(26, 27)

CLOCK/TIMER SET 3 (10, 25,

26)
DISC SKIP q; (12, 14)
DISPLAY wa (17, 27, 28)
ENTER 9 (10, 14, 15, 25, 26)
EQ qf (22)

F – Z

FM MODE 4 (17)
FUNCTION 6 (11, 14, 15, 16)
PLAY MODE w; (12, 14, 18)
REPEAT 4 (13)
SLEEP ws (25)
TAPE qj
TUNER BAND 5 (15, 16)
TUNER MEMORY ql (15)
TUNING MODE w; (15, 16)
VOLUME +/– qs (21, 25)

BUTTON DESCRIPTIONS

?/1 (power) 1 (8, 26)
m/M (rewind/fast forward)

7 (12, 19)
–/+ (tuning) qh (15)
./> (go back/go forward)

qh (10, 12, 19)

N (play) 8 (12, 18)
X (pause) 8 (12, 19)
x (stop) 8 (12, 19)

Setting the clock

Use buttons on the remote for the operation.

1

Press ?/1 to turn on the system.

2

Press CLOCK/TIMER SET.

3

Press . or > repeatedly to set the
hour.

4

Press ENTER.

5

Press . or > repeatedly to set the
minute.

6

Press ENTER.

The clock starts working.

To adjust the clock

1

Press CLOCK/TIMER SE T.

2

Press . or > repeatedly to select
“CLOCK SET”, then press ENTER.

3

Do the same procedures as step 3 to 6
above.

Notes

The clock settings are canceled when you disconnect

the power cord or if a power failure occurs.

ws
wa
w;
ql
qk
qj

qh

qg
qf

qd

1
2
3
4
5
6

7
8

9
q;

qa
qs

6

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

SET

3-1.COVER (TOP)

(Page 8)

3-2.CD DOOR

(Page 8)

HCD-RG444

SECTION 3

DISASSEMBLY

3-3.FRONT PANEL SECTION

(Page 9)

3-4.CD MECHANISM DECK

(CDM74-F1BD81)

(Page 9)

3-12.BD81A BOARD

(Page 13)

3-7.BACK PANEL SECTION,

SUB-TRANS BOARD

(Page 11)

3-8.POWER TRANSFORMER

(Page 11)

3-5.TAPE MECHANISM DECK,

GAME JACK BOARD

(Page 10)

3-13.CONNECT BOARD

(Page 14)

3-14.DRIVER BOARD,

SW BOARD

(Page 14)

3-9.MAIN BOARD

(Page 12)

3-6.PANEL BOARD

(Page 10)

3-15.OPTICAL PICK-UP

(KSM-215DCP/C2NP)

(Page 15)

3-10.SUB-WOOFER BOARD

(Page 12)

3-16.SENSOR BOARD

(Page 15)

3-17.MOTOR (TB) BOARD

(Page 16)

3-18.MOTOR (LD) BOARD

(Page 16)

3-11.AMP BOARD

(Page 13)

7

HCD-RG444

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

3-1. COVER (TOP)

6

two screws (Case 3 TP2)

cover

(Side-L)

qf

cover

qs

(top)

qa

two

screws (+BVTP 3

×

10)

7

screw (case 3 TP2)

9

screw

(+BVTP 3

× 10

8

screw

(+BVTP 3

)

× 10

q;

qs

)

qd

cover

(Side-R)

5

3

screw

(+BVTP 3

1

two screws

(case 3 TP2)

4

(+BVTP 3

2

screw (Case 3 TP2)

screw

× 10

× 10

)

)

3-2. CD DOOR

CD mechanism deck (CDM74)

1

Turn the pulley to the direction of arrow.

pulley

Front panel side

2

Pull-out the disc tray.

3

two claws

4

CD door

8

3-3. FRONT PANEL SECTION

)

0

connector 3p (CN304C)

8

wire (flat type) 17 core (CN253)

6

connector 2p (CN805)

3

screw (+BVTP 3

×

10)

4

screw (+BVTP 3

× 8

HCD-RG444

)

5

screw (+BVTP 3

× 8

)

qd

front panel section

3-4. CD MECHANISM DECK (CDM74-F1BD81)

2

screw (+BVTP 3

qs

connector 8p (CN103)

9

connector 5p (CN309)

7

wire (flat type) 29 core (CN302)

1

three screws (+BVTP 3

qa

connector 3p (CN102B)

×

× 8

)

1

three

10)

screws (+BVTP 3

×

10

4

CD mechanism deck (CDM74-F1BD81)

3

connector 9p (CN254)

2

connector 12p (CN701)

9

HCD-RG444

)

3-5. TAPE MECHANISM DECK, GAME JACK BOARD

1

wire (flat type) 13 core (CN602)

3

TRANSLATION board

2

(+BVTP 2.6

six

screws

×

8)

3-6. PANEL BOARD

2

seven

claws

6

GAME JACK board

5

two

screws

(+BVTP 2.6

4

connector

6p (CN604)

×

8)

4

tape mechanism deck

10

6

PANEL board

5

connector

5p (CN605)

3

wire (flat type) 13 core (CN602)

1

ten

(+BVTP 2.6

screws

×

8

3-7. BACK PANEL SECTION, SUB-TRANS BOARD

)

r

8

connector

2p (CN901)

2

connector

2p (CN906)

9

SUB-TRANS board

7

two

screws

(+BVTP 3

1

connector

2p (CN904)

× 10

)

4

connector

3p (CN308)

q;

back panel section

5

(+BVTP 3

two

screws

6

(+BVTP 3

HCD-RG444

×

10)

two

screws

×

10

3-8. POWER TRANSFORMER

1

connector

3p (CN905)

2

connector

10p (CN907)

3

15 core (CN101)

5

(+ITC 4

wire (flat type)

four

screws

× 8

)

6

power transforme

3

screw

(+BVIT 3

×

8R)

4

earth wire

11

HCD-RG444

d

d

3-9. MAIN BOARD

1

connector

10p (CN907)

2

connector

4p (CN501)

5

MAIN

Main board

boar

3-10. SUB-WOOFER BOARD

2

two

(transistor)

screws

4

13p (CN441)

3

two

(+BVTP 3

1

connector

7p (CN502)

3

two

(+BVTP 3

connector

screws

× 8

)

screws

× 8

)

4

SUB-WOOFER boar

12

3-11. AMP BOARD

)

)

3

two

screws

(+BVIT 3

4

two

screws

(transistor)

× 8R

)

6

AMP

2

screw

(+BVTP 3

board

×

14)

1

two

screws

(+BVTT 4

5

heat sink

HCD-RG444

× 8

3-12. BD81A BOARD

4

Remove soldering from the four points.

1

wire (flat type) 27 core (CN202)

3

screw

(+BVTP 2.6

5

BD81A

× 8

)

board

2

wire (flat type) 16 core (CN101

13

HCD-RG444

3-13. CONNECT BOARD

2

two

(+BVTP 2.6

3

CONNECT

screws

board

1

wire (flat type) 27 core (CN251)

× 8

)

3-14. DRIVER BOARD, SW BOARD

1

(+BTTP (M2.6))

4

DRIVER

2

wire (flat type) 5p (CN702)

two

screws

board

3

connector

4p (CN703)

5

screw

(+BTTP (M2.6))

6

SW board

14

3-15. OPTICAL PICK-UP (KSM-215DCP/C2NP)

2

h

older (213) ASSY

qh

optical pick-up

(KSM-215DCP/C2NP)

0

two

insulators

9

two

coil springs

(insulator)

8

t

wo stoppers (BU)

qa

HCD-RG444

1

floating

(+PTPWH M2.6)

6

two

insulators

5

two

coil springs

(insulator)

3

screw

(BVTT M2.6)

4

floating

(+PTPWH M2.6)

screw

screw

3-16. SENSOR BOARD

2

t

ray

7

(BVTT M2.6)

qd

Remove the four solderings of motor.

1

floating

(+PTPWH M2.6)

6

floating

(+PTPWH M2.6)

screw

8

s

(+BTTP (M2.6))

screw

t

wo screws

crew

0

SENSOR board

9

connector

(

CN731)

qf

CN101 (flat type)

qg

B

qs

s

crew (+BVTP 2.6x 8)

3

b

elt (table)

4

floating

(+PTPWH M2.6)

5

screw

p

ulley (table)

D81A board

7

g

ear (geneva)

15

HCD-RG444

3-17. MOTOR (TB) BOARD

2

stopper

4

1

stopper

5

t

able motor assy (M741)

3-18. MOTOR (LD) BOARD

4

Remove the two solderings of motor.

5

l

oading motor assy (M751)

3

7

MOTOR (TB) board

6

Remove the two solderings of motor.

5

two

screws

(+BTTP (M2.6))

2

two

screws

(+BTTP (M2.6))

3

MOTOR (LD) board

wire (flat type) 5 core (CN742)

16

1

b

elt (loading)

SECTION 4

TEST MODE

HCD-RG444

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

•A step of AM c hannels 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 TUNER/BAND 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.

[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 , PLAY MODE/TUNING MODE ,

and DISC 1 simultaneously.

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

the set is reset.

[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 is displayed 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 three discs in tray. Select ALL DISCS, and REPEAT OFF .

2) Load the tapes recording use into both decks.

3) Press three buttons x , PLAY MODE/TUNING MODE ,

and DISP SKIP/EX-CHANGE simultaneously.

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

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

2. Aging mode in CD section

1) Operation during aging mode

• In the agining mode ,the program is excuted in the following
sequence.

(1) The disc tray opens and closes.
(2) The disc tray turns to select a disc 3.
(3) The pick-up accesses to the first track, and plays 3 seconds.
(4) The pick-up accesses to the last track, and plays 3 seconds.
(5) The disc tray opens and closes.
(6) The disc tray turns to select a disc 1.
(7) The same operation starts like step (3).
(8) After a disc 1 aging operation, a disc 2 is selected.
(9) When an aging operation of a disc 3 is completed, the display

“AGING

∗∗∗∗” value increases.

(10) If no error occurs, the aging operation continues repeatedly.

2) Error display

Disc error

Display Error

E00D01022 Focus error (No disc)
E00D02022 Sub Q error (Focus is good)
E00D02023 TOC reading error
E00D02014 Access error (Unable within regular time)

Mechanism error

Display Error

E00M__E_0 Error during opening tray
E00M__C_2 EX-CHANGE disc error
E00M__D_0 Error during closing tray
E00M__F_3 EX-OPEN error
E00M__D_5 EX-CLOSE error
E00M__C_2 Chuck-up error
E00M__C_3 Unchucking error

3. Aging mode in Tape Deck section

1) Operation during aging mode

• In the agining mode, the program is excuted in the following
sequence.

Step

1

Rewind the TAPE A

2

Rewind the TAPE B

3

Play the TAPE A (1 minute)

4

Stop the TAPE A (1 second)

5

Play the TAPE A (3 minutes)

6

Rewind(AMS) the TAPE A

7

F.F.(AMS) the TAPE A

8

Play the TAPE B (1 minute)

9

Stop the TAPE B (1 second)

10

Record the TAPE B (3 minutes)

11

Rewind(AMS) the TAPE B

12

F.F.(AMS) the TAPE B

Operation

Display

TAPE AAG-1
TAPE BAG-2
TAPE AAG-2
TAPE AAG-3
TAPE AAG-4
TAPE AAG-5
TAPE AAG-6
TAPE BAG-2
TAPE BAG-3
TAPE BAG-4
TAPE BAG-5
TAPE BAG-6

2) Error display

• If error occurred, the display remains like “TAPE BAG-2”.

4. Exiting from the aging mode

• Be sure to perform Cold Reset to exit from the aging mode.

17

HCD-RG444

[P ANEL Test Mode]

• All f luorecent segments and LEDs are tested.

•Keyboard check.

Procedure:

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

2. To enter the test mode, press the three buttons x , PLAY
MODE/TUNING MODE and ENTER simultaneously.

3. All segments and LEDs (without STANDBY LED) are turned
on.

4. Press X and ENTER buttons simultaneously, and the key
check mode is activated.

5. The message “KEY 0 0 0 ” is displayed.
Each time a button is pressed, the key code number is displayed.

6. Press X and ENTER buttons simultaneously, and the key
count mode is activated.

7. The message “KEYCNT 0” is displayed.
Each time a button is pressed, “KEYCNT 0” value increased.
However, once a button is pressed, it is no longer taken into
account.

8. Press X and ENTER buttons simultaneously, and the head
phone detect mode is activated.

9. The message “H_P OFF” is displayed when a headphone jack
is not inserted.
“H_P ON ” is displayed when a headphone jack is inserted.

10. Press X and ENTER buttons simultaneously , and the v olume
control detect mode is activated.

11. The message “VOLUME FLAT” is displayed.
“VOLUME UP” is displayed if rotating MASTER VOLUME
knob clockwise, or “VOLUME DOWN” is displayed if rotating
counterclockwise.

12. T o exit from the GC test mode after the head phone detect mode,
press X and ENTER buttons simultaneously.

[Version and Destination Display Mode]

•The version or destination is displayed.

Procedure:

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

2. To enter the test mode, press the three buttons x , PLAY
MODE/TUNING MODE and DISC 2 simultaneously.

3. The destination is displayed.

4. Press DISPLAY buttons simultaneously.

5. The version is displayed.

6. To exit from this mode, press ?/1 button to turn the set OFF.

[CD Service Mode]

•This mode can run the CD sled motor freely. Use this mode, for

instance, when cleaning the pick-up.

Procedure:

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

2. Select the function “CD”.

3. T o enter the test mode, press three buttons x , PLAY MODE/
TUNING MODE , and Z simultaneously.

4. The CD service mode is selected.

5. With the CD in stop status, press M
pick-up to outside track, or press m button to inside track.

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

1) Move the pick-up to the most inside track.

2) Press ?/1 button to turn the set OFF.

Note: • Always move the pick-up 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.

button to move the

[MC Test Mode]

•This mode is used to test the function of the equalizer.

Procedure:

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

2. To enter the test mode, press the three buttons x , PLAY
MODE/TUNING MODE and DISC 3 simultaneously.

3. Press the EQ + button.
The function of the equalizer is set to “MIN”.

4. Press the EQ - button.
The function of the equalizer is set to “MAX”.

5. Press the PRESET EQ button.
The function of the equalizer is set to “EQ FLAT”.

6. MASTER VOLUME up and down.
“VOLUME MIN” “VOLUME 16” “VOLUME MAX” is
displayed.

7. Press the GROOVE button.
The message “VACS OFF” or “VACS ON” is displayed.

8. To exit from this mode, press ?/1 button to turn the set OFF.

[CD Ship Mode (LOCK) ]

•This mode moves the pick-up to the position durable to vibra-

tion. Use this mode when returning the set to the customer after
repair.

Procedure:

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

2. Select the function “CD”.

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

4. Press CD button and ?/1 button simultaneously.

5. The “STANDBY” display blinks instantaneously, and the CD
ship mode is set.

[CD Ship (LOCK) & COLD RESET MODE]

Procedure:

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

2. Select the function “CD”.

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

4. Press three buttons x , CD and DISPLAY simultaneously.

5. The “ST ANDBY” display blinks instantaneously and CD ship

mode is set.

6. To fluorescent indicator tube displays “COLD RESET” and

the set is reset.

[Disc T ray Lock]

Procedure:

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

2. Press two buttons of x and Z simultaneously for five seconds.

3. The message “LOCKED” is displayed and the tray is locked.

(Even if exiting from this mode, the tray is still locked.)

4. Press two buttons of x and Z simultaneously for fi ve seconds

again.

5. The message “UNLOCKED” is displayed and the tray is

unlocked.

6. To exit from this mode, press the ?/1 button to turn the set

OFF.

18

[CD Repeat 5 Times Limit Release Mode]

Procedure:

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

2. Select the function “CD”.

3. Press three buttons x , CD and ENTER simultaneously.

4. The message “LIMIT OFF” is displayed.

5. Press ?/1 button the set OFF.

[AMP TEST MODE]

Procedure:

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

2. To enter the test mode, press three buttons x , PLAY
MODE/TUNING MODE and ENTER simultaneously.

3. Press the DISPLAY button.
The message “V0 0 0” “ 000” is displayed.

4. Press the GROOVE button.
The message “DBFB ON” “DBFB OFF” is displayed.

5. Press the SURROUND button.
The message “SURROUND ON” “SURROUND OFF” is
displayed.

6. Press the EQ BAND button.
The message “LOW” “MID” “HIGH” is displayed.

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

HCD-RG444

19

HCD-RG444

)

SECTION 5

MECHANICAL ADJUSTMENTS

SECTION 6

ELECTRICAL 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.

Torque Measurement

Mode

FWD

FWD
back tension

REV

REV
back tension

FF/REV

FWD tension

REV tension

Torque meter

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

Meter reading

3.06 – 6.96 mN • m
(31 to 71 g • cm)

(0.43 – 0.98 oz • inch)

0.19 – 0.59 mN • m

2 to 6 g • cm

(0.03 – 0.08 oz • inch)

3.06 – 6.96 mN • m
(31 to 71 g • cm)

(0.43 – 0.98 oz • inch)

0.19 – 0.59 mN • m

(2 to 6 g • cm)

(0.03 – 0.08 oz • inch)

6.96 – 14.02 mN • m
(71 to 143 g • cm)

(0.98 – 1.99 oz • inch)

9.80 mN • m

(100 • cm or more)

(3.53 oz • inch or more)

9.80 mN • m

(100 • cm or more)

(3.53 oz • inch or more)

DECK SECTION

0 dB = 0.775 V

Precaution

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 Check

Record/Playback Head Azimuth Adjustment
DECKA DECKB

Note : Perform this adjustments for both desks.

Procedure:

1. Mode: Playback

test tape
P-4-A100
(10 kHz, – 10 dB)

AMP board
SPEAKER terminal (JK441
L-CH, R-CH

set

level meter

+

–

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.

20

Output
level

within
1dB

L-CH
peak

R-CH
peak

within
1dB

Screw
position

L-CH
peak

R-CH

Screw
position

peak

HCD-RG444

)

r

3. Mode: Playback

AMP board
test tape
P-4-A100
(10 kHz, – 10 dB)

L-CH

set

R-CH

in phase 45°90°135°180

SPEAKER terminal (JK441

L-CH

R-CH

waveform of oscilloscope

good

oscilloscope

wrong

H

V

°

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

Adjustment Location: Playback Head (Deck A)

Record/Playback/Erase Head (Deck B)

Tape Speed Check
DECKA DECKB

Mode: Playback

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

set

AMP board
SPEAKER terminal (JK441)
L-CH, R-CH

frequency counte

+
–

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

2. Press the H button on the deck.

3. Confirm that the frequency counter reads 3,000 ± 90 Hz.

Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)

(WS-48B)

reverseforward

21

HCD-RG444

CD SECTION

Note:

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

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

3. 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

Connection:

oscilloscope

BD81A board

TP (FEO)

TP (VC)

Procedure:

1. Connect an oscilloscope to test point TP (FEO) and TP (VC)

on the BD81A board.

2. Turn the power on.

3. Put the disc (YEDS-18) in and press the button and

actuate the focus search. (actuate the focus search when
disc table is moving in and out)

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

between A and B. And confirm peak to peak level within 2 ± 1
Vp-p.

S-curve waveform

+
–

symmetry

A

B

H

within 2

±

1 Vp-p

RFDC signal waveform

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

level: 0.6

±

0.15 Vp-p

Checking Location: BD81A board (Side B)

RFAC Level Check

Connection:

oscilloscope

BD81A board

TP (RFACO)

TP (VC)

+
–

Procedure:

1. Connect an oscilloscope to test point TP (RF ACO) and TP
(VC) on the BD81A board.

2. Turn the power on.

3. Put the disc (YEDS-18) in to playback the number five track.

4. Confirm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.

Note:

A clear RFAC signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.

RFAC signal waveform

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

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.

Checking Location: BD81A board (Side B)

RFDC Le

vel Check

Connection:

oscilloscope

BD81A board

TP (RFDCO)

TP (VC)

+
–

Procedure:

1. Connect an oscilloscope to test point (RFDCO) and TP (VC)
on the BD81A board.

2. Turn the power on.

3. Put the disc (YEDS-18) in to playback the number five track.

4. Confirm that oscilloscope wav eform is clear and check RFDC
signal level is correct or not.

Note:

A clear RFDC signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.

Checking Location: BD81A board (Side B)

level: 1.0

±

0.4 Vp-p

22

HCD-RG444

E-F Balance Adjustment

Connection:

oscilloscope

BD81A board

TP (TEO)

TP (VC)

+
–

Procedure:

1. Connect an oscilloscpe to test point TP (TEO) and TP (VC) on
the BD81A board.

x

PLAY MODE/TUNING MODE

2. Press three buttons

and simulfaneously enter the CD test mode.

Z

,,

3. Put the disc (YEDS-18) in to playback the number five track.

H

4. Press the button. If it plays, press the

H

button again.

(The tracking servo and the sledding servo are turned OFF)

5. 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 Wavef orm

0V

Center of
the waveform

B

A (DC

voltage)

level: 1.0 ± 0.5 Vp-p

Checking Location:

– BD81A BOARD (Side B) –

BD81A BOARD

(SideB)

IC251

TP

(VC)

TP

(TEO)

TP

(FEO)

TP

(RFDCO)

IC301

IC101

TP

(RFACO)

IC303

6. Press the button. (The tracking servo and sledding

H

servo are turned ON)

7. To exit from this mode, turn the power off.

Notes: •Always move the optical pick-up to most inside track when

0V

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

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

Traverse Wavef orm

Tracking servo

Sled servo

OFF

Tracking servo

Sled servo

ON

C (DC
voltage)

Checking Location: BD81A board (Side B)

23