Sony HCD-GR5 User manual

— 1 —
HCD-GR5/RX50
COMPACT DISC DECK RECEIVER
AEP Model
UK Model
HCD-RX50
E Model
Tourist Model
HCD-GR5
SERVICE MANUAL
HCD-GR5/RX50 is the tuner, deck, CD
and amplifier section in MHC-GR5/RX50.
Model Name Using Similar Mechanism HCD-H551
CD Mechanism Type CDM28-5BD19
Base Unit Type BU-5BD19
Optical Pick-up Type KSS-213BA/F-NP
Model Name Using Similar Mechanism HCD-H551
Tape Transport Mechanism Type TCM-220WR2E
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol aare trademarks
of Dolby Laboratories Licensing Corporation.
SPECIFICATIONS
MICROFILM
CD
SECTION
TAPE
DECK
SECTION
CD player section
System Compact disc and digital
audio system
Laser Semiconductor (λ= 780nm)
Emission duration:
continuous
Laser output Max 44.6 µW*
*This output is the value
measured at a distance of
200mm from the objective
lens surface on the Optical
Pick-up Block with 7mm
aperture.
Wavelength 780 – 790 nm
Frequency response
2 Hz – 20 kHz (±0.5 dB)
Signal-to-noise ratio
More than 90 dB
Dynamic range More than 90 dB
CD DIGITAL OPTICAL OUTPUT
(Square optical connector jack,rear panel)
Wavelength 600nm
Output level -18dBm
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
East European model:
65.0 – 75.0 MHz,
87.5 – 108.0 MHz
— Continue on next page —
Tourist model: 76.0 – 108.0 MHz
Other models: 87.5 – 108.0 MHz
Aerial FM lead aerial
Aerial terminals 75 ohm unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
AEP, UK, East European models:
MW: 531 – 1,602 kHz (with
the interval set at 9 kHz)
LW: 153 – 279 kHz (with
the interval set at 3 kHz)
German models:
531 – 1,602 kHz (with
the interval set at 9 kHz)
EA4,Thailand models:
531 – 1,710 kHz(with
the interval set at 9 kHz)
530 – 1,710 kHz(with
the interval set at 10 kHz)
Photo: HCD-GR5

— 2 —
Other models: MW: 531 – 1,602 kHz (with
the interval set at 9 kHz)
MW: 530 – 1,710 kHz (with
the interval set at 10 kHz)
SW: 5.95 – 17.90 MHz
(with the interval set at 10 kHz)
Antenna AM loop antenna,
External antenna terminals
Intermediate frequency
450 kHz
Amplifier section
(AEP,UK,German,East European models)
DIN power output
40W+40W (6 ohms, at
1kHz, DIN)
Continuous RMS power output
50W+50W (6 ohms, at
1kHz, 10% THD)
Music power output
85W+85W (6 ohms, at
1kHz, 10% THD)
(Other models)
Peak music power output
800W
Continuous RMS power output
50W+50W (6 ohms, at
1kHz, 10% THD)
Inputs
MIX MIC (phone jacks):
sensitivity 1 mV,
impedance 10 kilohms
AUDIO IN: Audio (Phono Jacks)
Voltage 450mV
Impedance 47 kilohms
Outputs
PHONES (stereo phone jack):
accepts headphones of 8 ohms
or more.
SPEAKER: accepts impedance of 6 to
16 ohms.
AUDIO OUT:
Audio (Phono Jacks)
Voltage 450mV
Impedance 1 kilohms
GR5 model:
SUPPER WOOFER:
Voltage 1 V, impedance
1 kilohms
Tape player section
Recording system4-track 2-channel stereo
Frequency response
(DOLBY NR OFF)
40 – 13,000 Hz (±3 dB),
using Sony TYPE I cassette
40 – 14,000 Hz (±3 dB),
using Sony TYPE II cassette
Wow and flutter 0.3% W.RMS (NAB)
General
Power requirements
AEP,UK,German,East European models:
220 – 230 V AC, 50/60 Hz
EA4,Thailand models:
220 – 240 V AC, 50/60 Hz
Other models:
110 – 120 V, 220 – 240 V
AC, 50/60 Hz
Adjustable with the voltage selector
Power consumption
95 W
Dimensions Approx. 280 x 330 x 360 mm
(11 1/8 x 13 x 14 1/4 in)
(w/h/d)
incl. projecting parts and
controls
Mass Approx. 7.5 kg (16 lb 9 oz)
Design and specifications are subject to
change without notice.
• Abbreviation
EA4: Without voltage selector Saudi Arabia model

— 3 —
MODEL PARTS No.
GR5 : E model
GR5 : EA3,Taiwan, Tourist model
GR5 : Singapore,Malaysia model
GR5 : Hong Kong model
GR5 : Indonesian model
GR5 : EA4,Thailand model
RX50 : AEP,German model
RX50 : UK model
RX50 : East European model
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED
LINEWITHMARK!ONTHE SCHEMATICDIAGRAMS AND
INTHE PARTS LIST ARE CRITICALTO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
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.
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.
This caution
label is located
inside the unit.
MODEL IDENTIFICATION
— BACK PANEL —
Parts No.
4-988-833-0π
4-988-833-1π
4-988-833-2π
4-988-833-3π
4-988-833-4π
4-988-833-5π
4-988-834-0π
4-988-834-1π
4-988-834-2π
• Abbreviation
EA3: With voltage selector SaudiArabia model.
EA4: Without voltage selector SaudiArabia model.

— 4 —
1. SERVICING NOTE .................................................... 5
2. GENERAL .................................................................... 6
3. DISASSEMBLY
3-1. Front Panel ....................................................................... 8
3-2. TC Mechanism Deck ....................................................... 8
3-3. HP Board, JOG Board and PANEL Board ...................... 9
3-4. CD Block .........................................................................10
3-5. CD Mechanism Deck .......................................................10
4. MECHANICAL ADJUSTMENTS .........................11
5. ELECTRICAL ADJUSTMENTS
DECK Section .........................................................................11
TUNER Section .......................................................................14
CD Section ..............................................................................16
6. DIAGRAMS
6-1. Block Diagrams
• CD Section .....................................................................18
• Main Section ..................................................................19
• Tuner Section
(AEP, UK, German, East European Model) ..................21
• Tuner Section (Tourist Model) ..................................... 22
• Deck Section ..................................................................23
6-2. Circuit Boards Location ...................................................24
6-3. Printed Wiring Board — Panel Section —........................25
6-4. Schematic Diagram — Panel Section — ......................27
6-5. Schematic Diagram — Main Section — ........................31
6-6. Printed Wiring Board — Main Section — ......................35
6-7. Schematic Diagram — Deck Section — ........................39
6-8. Printed Wiring Board — Deck Section — ......................43
6-9. Schematic Diagram — CD Section — ............................46
6-10.Printed Wiring Board — CD Section — .........................49
6-11.Schematic Diagram — Tuner Section —
(AEP, UK, German, East European Model)......................52
6-12.Schematic Diagram — Tuner Section —
(Tourist Model) .................................................................55
6-13.Printed Wiring Board — Tuner Section —
(AEP, UK, German, East European Model) .....................58
(Tourist Model) ................................................................ 59
6-14.IC Pin Functions
• IC501 Graphic Control (µPD78042FGF-027-3B9)........61
• IC701 Master Control (TMP87CP64YF-6521).............. 62
6-15.IC Block Diagrams .......................................................... 65
7. EXPLODEDVIEWS
7-1. Case Section .....................................................................71
7-2. Back Panel Section ..........................................................72
7-3. Front Panel Section 1 .......................................................73
7-4. Front Panel Section 2 .......................................................74
7-5. CD Mechanism Section (CDM28-5BD19) ......................75
7-6. Base Unit Section (BU-5BD19) .......................................76
7-7. TC Mechanism Section 1 (TCM-220WR2E) ..................77
7-8. TC Mechanism Section 2 (TCM-220WR2E) ..................78
8. ELECTRICAL PARTS LIST....................................79
TABLE OF CONTENTS

— 5 —
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 pick-
up 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
Carryoutthe“Scurve check” in“CDsectionadjustment”and check
that the S curve waveform is output two times.
Note for installation (ROTARY ENCODER)
[FL Display Tube, LED All Lit and Key Check mode]
When the TUNER/BAND , DISPLAY , and MENU 2 buttons
are pressed simultaneously, the FL display tube and LEDs will all
light up. Press any button to enter the key check mode.
When the key check mode is entered, the FL display tube displays
“K 1 J0 V0”. Each time a button is pressed, the counter increases
in the following order, K 2 nK 3 nK 4.
If buttons already pressed once are pressed again, the counter will
notincrease.When the VOLUME knob is rotatedinthe+direction,
the count increases in the following order.
V1 nV2 nV3.
When rotated in the–direction, it decreases in the following order.
V0 nV9 nV8.
When theAMS dial is rotated in the clockwise direction, the count
increases in the following order.
J1 nJ2 nJ3.
When rotated in the counterclockwise direction, it decreases in the
following order.
J0 nJ9 nJ8.
To exit form the test mode, press the TUNER/BAND , DISPLAY
, MENU 2 buttons simultaneously again.
[Switching the channel step 9 KHz/10 KHz]
Press ENTER/NEXT button and POWER buttonsimultaneously
to switch the AM channel step 9 KHz and 10 KHz. Be sure not to
change with carelessness.
NOTES ON HANDLINGTHE 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.
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH
TURNS OFF
SECTION 1
SERVICING NOTE
Insert a tapering driver into the
apertureoftheunitbottom,andturn
in the direction of arrow.
* To close the disc tray, turn the
driver in the reverse direction.
Note :
When attaching the BU
cam, engage the Rotary
encoderswitchasshownin
the figure.
Note :
WhenattachingtheBase unit, insertthe
section A into the groove of BU cam.
groove
BU cam
Section A

— 6 —
SECTION 2
GENERAL This section is extracted from
instruction manual.
^
·
ª· ª
·
ª· ª
1
2
3
4
5
6
7
8
9
0
!¡


!™
!£
!¢
!∞
!
§
! ¶
!ª
!•
@º
@¡
@™
@£
@¢
@∞
@§
@¶
@•
@ª
#º
#¡
#™
#£
#¢
#∞
@•
@ª 
#º
#§
#™
Index to Parts and Controls
Refer to the pages indicated in parentheses for
details on how to use the controls.
Controls with an asterisk have indicators on
themselves.
Front Panel
1Disc tray
2POWER switch
3LOOP button
4TIMER button
5PHONES jack
6DISPLAY button
7SURROUND button
8MIX MIC jack
9MULTI FUNCTION CONTROL buttons
0FREQUENCY +/– buttons
!¡ JOG dial
!™ MENU 1 – 3 button
!£ §OPEN / CLOSE button
!¢ fl(play / pause) button
!∞ p(stop) button
!§ P FILE button
!¶ EFFECT ON / OFF button
!• TUNER / BAND button
!ª FUNCTION button
@º ENTER / NEXT button
@¡ GROOVE button
@™ DBFB button
@£ VOLUME control
@¢ KARAOKE PON / MPX button
@∞ HIGH SPEED DUBBING button
@§ DIRECTION button
@¶ DOLBY NR button
@• 0/ )(rewind / fast forward) button
@ª ª/ ·(reverse side play /
front side play) button
#º p(stop) button
#¡ Deck A
#™ §EJECT button
#£ CD SYNCHRO button
#¢ rREC button
#∞ PPAUSE button
#§ Deck B
C D CONTINUE SHUFFLE PROGRAM REPEAT
TUNER TUNING
MODE TUNER MEMORY STEREO MONO
TIMER CLOCK SET SELECT SLEEP
CD player
Tuner
Timer
SET
1
2
3
4
5
6
1
2
3
4
MULTI FUNCTION CONTROL buttons
The buttons you can operate the CD player,
tuner and the timer light up.
Rear Panel
1MD OUT / IN jacks
2CD DIGITAL OUT OPTICAL jack
3SPEAKER L / R connectors
4SUPER WOOFER jack
5ANTENNA terminals
6Voltage selector (except for EA4, Thailand
models)
1MD OUT / IN jacks
2CD DIGITAL OUT OPTICAL jack
3SPEAKER L / R connectors
4ANTENNA terminals
(AEP, UK, German, East European models)
(E, EA, Hong Kong, Malaysia, Singapore,
Taiwan, Tourist,Thailand,Indonesianmodels)
• Abbreviation
EA4:Without voltage selectorSaudiArabiamodel

— 7 —
+
–
–+
–+
1
2
3
4
5
6
7
8
9
0
!¡
!™
!£
!¢
!∞
!§
!¶
!•
1SLEEP button
2LOOP button
3CD button
4TUNER / BAND button
5DECK A / DECK B button
6FUNCTION button
7/ button
8MUSIC MENU ON / OFF button
9/ button
0POWER switch
!¡ (pause) button
!™ (stop) button 
!£ / AMS* button
!¢ / (rewind / fast forward)
button
!∞ EDIT button
!§ CHECK button
!¶ CLEAR button
!• VOL (+ / –) button
* AMS=Auto Music Sensor


MANUAL
PRESET
AUTO
SYNC
REC khz dB
Mhz MIN
12 REC SLEEP
SUR 12
MPX
PON
TUNED MONO STEREO
DOLBY NR
B OFF RELAY
12345
678910
11 12 13 14 15
16 17 18 19 20
DBFB
ALL PROGRAM
1DISK S SHUFFLE
REPEAT 1 STEP
VOL
1
!™
23 456789 0 !¡
!£ !¢
1SUR indicators
2indicator
3Timer indicators
4Karaoke PON / MPX indicators 
5DOLBY NR indicator
6Tuning indicator
7Direction mode indicators
8DBFB indicator
9CD playback indicators
0Music calendar
!¡ VOLUME indicators
!™ Tuner indicators
!£ Multi display
!¢ Radio frequency / playing time / sound
frequency level indications
Display Window Remote (RM-SD50)

— 8 —
SECTION 3
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
3-1. FRONT PANEL
3-2.TC MECHANISM DECK
1 Remove the connectors
(MAIN board: CN402, CN702)
(HP board: CN513)
6 TC mechanism deck
5 Three screws
(+BVTP2.6X8)
3 Cassette holder
assembly (A), (B)
4 Torsion spring
(L), (R)
1 Push the EJECT button.
(Two positions)
2 Remove the claws
(Four positions)
4 Two screws
(+BVTP2.6X8)
CN402
CN702
2 Two screws
(+BVTT3X8)
CN513
5 Remove the claws
(Three positions)
3 Two screws
(+BVTT3X8)

— 9 —
.
3-3. HP BOARD, JOG BOARD AND PANEL BOARD
* Note: It will be easy to remove if you push
lightly from the hole of the JOG board
with some screwdrivers or etc.
3 Nut
1 Knob (VOL) * Note
2 Knob (JOG) * Note
4 Nut
0 Three claws
!¡ Claw
9 Two claws
!£ PANEL board
8 Six screws
(+BVTP2.6X8)
6 HP board
5 Two screws
(+BVTP2.6X8)
!™ JOG board
7 Six screws
(+BVTP2.6X8)
Screw driver

— 10 —
3-5. CD MECHANISM DECK
3-4. CD BLOCK
1 Remove the connectors
(MAIN board: CN201)
(LOADING board: CN291)
4 CD block
(CD mechanism deck
and CD chassis)
3 Two screws
(+BVTP3X8)
2 PC board holder CN291
CN201
3 Remove the CD mechanism
deckdirectionofarrow.
1 Two screws
(+BVTP3X8)
2 Two claws

— 11 —
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
Used for
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
SECTION 4
MECHANICAL ADJUSTMENTS
DECK SECTION 0 dB=0.775V
1. Demagnetizetherecord/playbackheadwith a headdamagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustmentsshouldbeperformed with theratedpower 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 R-CH.
7. Switches and controls should be set as follows unless otherwise
specified.
DOLBY NR switch: OFF
FWD
REV
REV
back tension
FF/REW
FWD tension
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
2 to 6 g • cm
(0.02 - 0.08 oz • inch)
36 to 61 g • cm
(0.5 - 0.84 oz • inch)
2 to 6 g • cm
(0.02 - 0.08 oz • inch)
61 to 143 g • cm
(0.85 - 1.99 oz • inch)
100 g or more
(3.53 oz or more)
100 g or more
(3.53 oz or more)
FWD
back tension
REV tension
Torque Torque meter Meter reading
36 to 61 g • cm
(0.5 - 0.84 oz • inch) SignalTape
P-4-A100
WS-48B
P-4-L300
10 kHz, –10 dB
3 kHz, 0 dB
315 Hz, 0 dB
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
test tape
P-4-A100
(10kHz, –10dB) MAIN board
CN403
Pin
3 (L-CH)
Pin
1 (R-CH)
set
MAIN board
CN403
Pin
2 (GND)
level meter
+
–
SECTION 5
ELECTRICAL ADJUSTMENTS

— 12 —
Procedure:
1. Mode : Playback
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 1 dB of peak.
3. Mode: Playback
main board
CN403
Pin
3 (L-CH)
Pin
2 (GND)
set L
R
test tape
P-4-A100
(10kHz, –10dB)
oscilloscope
Waveform of oscilloscope
in phase 45˚ 90˚ 135˚ 180˚
wronggood
Tape Speed Adjustment (Deck A)
Note: Start the Tape Speed adjustment as below after setting the
test mode.
The tape speed can be changed with the HIGH SPEED
DUBBING button during the test mode.
Method :
1. Turn the power switch on.
2. Press the DISPLAY button, MENU 1 button and TUNER/
BAND button simultaneously.
Procedure :
Mode: Playback
Pin 1 (R-CH)
frequency counter
+
–
MAIN board
CN403 Pin
3 (L-CH)
Pin
1 (R-CH)
set
test tape WS-48B
(3kHz, 0dB)
1. Insert the WS-48B into the deckA to playback.
2. Press the HIGH SPEED DUBBING button. Then at HIGH
SPEED mode.
3. Adjust the RV652 on the AUDIO board so that the frequency
counter reading becomes 6,000 ± 90 Hz.
4. Press the HIGH SPEED DUBBING button again to be set the
NORMAL SPEED mode.
5. Set to the playback mode.
6. Adjust the RV651 on the AUDIO board so that the frequency
counter reading becomes 3,000 ± 90 Hz.
Frequency difference between deck A and deck B the beginning
of the tape should be within ± 1.5%.
Adjustment Location: AUDIO board
Playback Level Adjustment (Deck A, Deck B)
Procedure:
Mode: Playback
set
MAIN board
CN403 Pin
3 (L-CH)
Pin
1 (R-CH)
level meter
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Adjustment level:
CN403 playback 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
test tape P-4-L300
(315Hz, 0dB)
L-CH
peak output
level within
1dB
within 1dB
R-CH
peak
screw
position L-CH
peak
screw
position
R-CH
peak
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
Adjustment screw
FWD side REV side

— 13 —
Record Level Adjustment (Deck B)
Procedure:
1. Press FUNCTION button to Select MD.
2. Mode: Record
blank tape
CS-123
Record Bias Adjustment (Deck B)
Procedure:
1. Press FUNCTION button to Select MD.
2. Mode: Record
4. Confirm playback the signal recorded in step 2 become
adjustment level as follows.
If these levels do not adjustment level, adjust the RV341 (L-CH)
and RV441 (R-CH) on theAUDIO board to repeat steps 2 and 3.
Adjustment level: The playback output of 10 kHz level difference
against 315 Hz reference should be ± 0.5 dB.
Adjustment Location: AUDIO board
MD IN
1) 315Hz
2) 10kHz
} 50 mV (–23.8 dB)
AF OSC
attenuator 600 blank tape
CS-123
set
MAIN board
CN403 Pin
3 (L-CH)
Pin
1 (R-CH)
level meter
recorded
position
set
3. Mode: Playback
Adjustment Location:
[AUDIO BOARD] (Conductor Side)
MD IN
315Hz 50mV (–23.8 dB)
AF OSC
attenuator 600
set
3. Mode: Playback
recorded
portion
set
MAIN board
CN403 Pin
3 (L-CH)
Pin
1 (R-CH)
4. Confirm playback the signal recorded in step 2 become
adjustment level as follows.
If these levels do not adjustment level, adjust the RV301 (L-CH)
and RV351 (R-CH) on the MAIN board to repeat steps 2 and 3.
Adjustment level:
CN403 PB level: 47.3 to 53.1 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
RV301
IC401
13
CN403 RV351
RV351
Record Level Adjustment
(R CH)
RV301
RecordLevelAdjustment
(L CH)
RV341 (L CH), 441 (R CH)
Record Bias Adjustment
RV301
RV401 RV341 RV651 RV652
RV311
RV411
RV301 (L CH), 401(R CH)
Playback Level Adjustment
(Deck B)
RV441
RV311 (L CH), 411 (R CH)
Playback Level Adjustment
(Deck A)
level meter
RV651 (Normal speed)
RV652 (High speed)
Tape Speed Adjustment
[MAIN BOARD] (Component Side)

— 14 —
TUNER SECTION 0dB=1µV
Note: 1. As a front-end (FE1) isdifficult to repair if faulty, replace
it with new one.
2. No adjustment is needed due to a tuner pack.
AMTuned Level Adjustment
Note: FM Tuned Level adjustment should be performed after this
AM Tuned Level Adjustment.
Setting:
Band: AM or MW
loop antenna
(Supplied accessories)
AM RF SSG
loop antenna
30% amplitude
modulation by
400Hz signal
60cm AM antenna
terminal (TM1)
Field strength dB (µV/m) = SSG output level dB (µV/m) –26dB.
Modulation: 999 kHz (at 9 kHz step)
1,050 kHz (at 10 kHz step)
Procedure:
1. Supply a 25 dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust RV42 to the point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location: TCB board
set
Procedure:
1. Set the output of SSG so that the input level of the set becomes
55 dB.
2. Tune the set to 999 kHz or 1,050 kHz.
3. Adjust RV41 to the point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location: TCB board
FMTuned Level Adjustment
Note:Thisadjustment should beafterAMTuned LevelAdjustment.
Setting:
Band: FM
FM RF stereo signal
generator
75
Ω coaxial
set
Carrier frequency : 98MHz
Modulation : AUDIO 1kHz, 75kHz
deviation (100%)
Output level : 25dB (at 75
Ω open)
Adjustment Location:
[TCB BOARD] (Component Side)
RV41
AM Tuned Level
Adjustment
RV41
TM1
IC41RV42
RV42
FM Tuned Level
Adjustment
FE1
FM ANTENNA terminal
(TM1)

— 15 —
SW OSCVoltage Adjustment
(Tourist model)
Setting:
Band: SW
Procedure:
1. Connect digital Voltmeter to diode D1 center lead and ground.
2. Adjust for a following value reading on digital voltmeter.
Procedure:
Adjust for maximum reading on level meter.
Adjustment Location:
[TCB BOARD] — Component Side —
D1, CV2, T2
SW OSC Voltage
Adjustment
IC41
CV2 CV1
D1
T2 T1 TM1
CV1, T1
SW Tracking
Adjustment
Set frequency
1.2 ± 0.1 V
8.5 ± 0.2 V
5.95 MHz
17.9 MHz
T2
CV2
Reading on digital
voltmeter
Adjustment
part
SW
SWTracking Adjustment
(Tourist model)
Setting:
Band: SW
AM RF SSG
set
level meter
SPEAKER terminal
AM ANTENNA terminal
30% amplitude
modulation by
400Hz signal
Set frequency
SW 7 MHz
17 MHz
T1
CV1
• Repeat the procedures is each adjustment several times, and the
frequencycoverageandtracking adjustment shouldbefinallydone
by the trimmer capacitors.
Adjustment
part

— 16 —
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. UseYEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩimpedance.
4. Clean theobjectlensby an applicatorwithneutral detergentwhen
the signal level is low than specified value with the following
checks.
5. Adjust the focus bias adjustment when optical block is replaced.
Focus Bias Adjustment
S Curve Check
Procedure :
BD board
TP (RF)
TP (VC)
oscilloscope
Procedure:
1. Connect oscilloscope to test point TP (RF).
(Ground terminal : TP (VC))
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
(Clear RF signal waveform means that the shape “ ” can be
clearly distinguished at the center of the waveform.)
5. After adjustment, check the RF signal level.
• RF signal
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
level: 1.3 ± 0.3 Vp-p
BD board
TP (FEO)
TP (VC)
oscilloscope
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and Ground by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 2.4 ±
0.7 Vp-p.
S-curve waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
A
B
symmetry
within 2.4 ± 0.7 Vp-p
6. After check, remove the lead wire connected in step 2.
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
Procedure :
BD board
oscilloscope
TP (RF)
TP (VC)
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
Note: Clear RF signal waveform means that the shape “ ” can be
clearly distinguished at the center of the waveform.
RF signal waveform
level: 1.3 ± 0.3 Vp-p

— 17 —
Adjustment Location:
[BD BOARD] — Component Side —
E-F Balance Check
Procedure:
1. Connect test point TP703 (ADJ2) on MAIN board to Ground
with a lead wire.
2. Connect oscilloscpe to test point TP (TEO).
3. Turned Power switch on.
4. Put disc (YEDS-18) in and playback.
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
Traverse waveform
[MAIN BOARD] — Conductor Side —
IC701
TP703
(ADJ2)
oscilloscope
BD board
TP (TEO)
TP (VC)
0V
A
B
level: 300 ± 100 mVp-p
Specified level: • x 100 = less than ± 7%
• A + B = 300 ± 100 mVp-p
6. Remove the lead wire connected in step 1.
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
A – B
2 (A + B)
RF
RV101
IC101
FOK
RV102
TEO FEO
TEI
FEI
VC
RV103
IC104
GND
PCK
IC102

— 18 —
6-1 BLOCK DIAGRAMS
- CD SECTION -
M
M
26
.
27
1
.
2
3
59
57
56
55
54
1
3
14
39
34 4
20
21
22 3
13
26 28 27
1
2
16
6
4
7
19
37
13
12
20
21
31
25
23
24
25
33
34
35
36
38
39
2
1
42
44
1
2
4
5
6
10
7
12
11
17
18
9
19
4
25 16 14
OPTICAL PICK-UP BLOCK
DETECTOR K B+
E
A
B
D
C
F
A
D
C
B
LASER
DIODE
TRACKING
COIL
FOCUS
COIL
2-AXIS
DEVICE
SLED/SPINDLE
MOTOR DRIVE
IC102 (2/2)
M102
SLED MOTOR
M101
SPINDLE MOTOR
SLED MOTOR
DRIVE
SPINDLE MOTOR
DRIVE
SLO SL+
SLED
SERVO
IC101 (2/2)
F+
F-
T+
T-
FOCUS
COIL DRIVE
TRACKING
COIL DRIVE
FOCUS/TRAKING
COIL DRIVE
IC102 (1/2)
XRESET
Q101,102
LD DRIVE
RF1
PD2
F
E
LD
TEI
TEO
FEO
FE1
PHD
XRST
TA-O
TA-M
FE-M
FE-O
FEBIAS
CLK
XLT
DATA
FOK
SENS
C,OUT
RFO
L-CH
R-CH
LRCK
PCMD
BCLK
RF
CNIN
SEIN
FOK
DATAO
XLTO
CLKO
IC103
DIGITAL SIGNAL
PROCESSOR
CLV SERVO
MDP
43
SCOR
50
XRST
53
CLOCK
52
XLAT
51
DATA
49
SENS
46
SQS0
47
SQCK
MAIN
SECTION
(page 19)
C
• R CH:Same as L CH
• SIGNAL PATH
:CD
:digidal out
IC101 (1/2)
FOCUS/TRACKING SERVO
EFM COMPARATOR
X101
16.9344MHz
RV103
TRACKING
GAIN
RV102
FOCUS
GAIN
B+
RV101
FOCUS
BIAS
Q103
FOCUSSW
XTAI
DOUT
DATA
CKO
LRCK
BCLK
L OUT
R OUT
DATA MLAT CLOCK
5 • 6
XTI
XTO
FOCUS SW
XRST
XLAT
OUT SW
IN SW
LOAD IN
LOAD OUT
SENS
SQ CLK
SQ DATA
SCOR
DF LAT
CD DATA
CD CLK
FGD
IC104
DIGITAL FILTER
D/A CONVERTER
IC200 CD
DIGITAL OUT
OPTICAL
S291 LOAD OUT
S292 LOAD IN
2
10
5
6
M
IC201
LOADING MOTOR DRIVER
OUT1
OUT2
IN1
IN2
M903
LOADING MOTOR
HCD-GR5/RX50
SECTION 6
DIAGRAMS

+
–
32 33 34
62
67
77
70
34
35
36
37
32
13
14
15
16
46
19
47
45
31
44
12
4
8 17
2
3
34
35
5
6
68
3
2
1
10
6
9
71 45 44 43 42 38 110
EQ
62
MICON
INTERFACE
29
28
30 IC901
EQUALIZER/VOLUME
62 40 41
BB22
BB12
Q901
DBFB
SWITCH
Q902
FEED
BACK
65 64
J601
IC601
MIC AMP
R-CH
IC802 INPUT SELECTOR
MIX
MIC
5
Q820
MUTE
SWITCH
R-CH
R-CH
R-CH
Q954
MUTE
IC1201
POWER AMP
Q1201
OVER LOAD
DET
R-CH
R-CH
+B
Q1207
RELAY DRIVE
Q1208
HP/SP
SWITCHING
IC1202
PROTECTOR
6
2
7
1
+
+
+
+
4
+
-
D1309,1310
RECT
D1097
|
D1099
RECT
IC1001
+5V REG
IC1004
-7V REG
Q1003
+10V REG
Q1006
-25V REG
Q1001,1002
CD POWER
ON/OFF
IC1002
+7V REG
IC1003
+7V REG
D1250
RECT
D1001
RECT
D1013
D1014
RECT
D1003
|
D1006
RECT
T1601
POWER TRANSFORMER
VS1601
VOLTAGE
SELECTOR
EXCEPT AEP,UK,G,EE,EA4,TH
AC -IN
RY1201
4
• R CH:Same as L CH
• SIGNAL PATH
: FM
: PB
: REC
: MD
: CD
G
EE
EA4
TH
JE
: German model.
: East European model.
: Without voltage selector Saudi Arabia model.
: Thailand model.
: Tourist model.
• Abbreviation
CK
DA
TM1201
J501
PHONES
SPEAKER
J201
SUPER
WOOFER
EXCEPT AEP,UK,G,EE
Q1204
Q1205
PROTECTOR
SWITCH
Q1206
STANDBY
SWITCH
VF
+B
-B
D1016,1017
D1021,1022
TC +5V
+7.5V
-7.5V
ST +10V
VF DP
D704
D706
D1018
+7.5V
+5.6V
+5V
+5V
D +5V
D +5V
(CD)
55
56
57
58
59
60
61
80
B
81
82
83
84
85
86
87
88
89
90
91
92
73
71
72
93
94
95
10
25
29
30
31
38
40
43
44
45
46
20
16
21
22
TC RELAY
B SHUT
B HALF
A HALF
220 A PLAY
220 B PLAY
TC A
NORM
REC MUTE
NR OFF
PB
PASS AMP/DOLBY
LINE MUTE ON
CAP M HIGH
A TRG
B TRG
TRG LOW
CAP M ON
COM DATA
COM CLK
COM DIN
STEREO
TUNED
ST CE
ST MUTE ON
SCOR
DF LAT
SENS
XRST
CD CLK
CD DATA
FOCUS SW
SQ CLK
SQ DATA
X LAT
OUT-SW-OPEN
IN SW
LOAD IN
LOAD OUT
BIAS OFF
A SHUT POWER ON
DBFB HIGH
MUTE
GM REQ
MG CLK
GM DATA
MG DATA
MG RDY
RESET
XOUT
XIN
XOUT
XIN
AC CUT
CD POWER
Q701
RESET
SWITCH
IC702
RESET
+5.6V
D705
X701
10MHz X501 5MHz
X702
32kHz
IC701
MASTER CONTROL
Q501
LED
CONTROL
IC502
REMOTE
CONTROL
RECEIVER
ROTARY
ENCODER
ROTARY
ENCODER
KEY
MATRIX
Q504
Q507-511
Q601-603
LED
DRIVE
D579,583
D585-590
D601,611,621
MULTI JOG
STATION
S562
43
|
40
•• 10
•
•
9
51
|
49
D +5V
Q502,503
28
|
25
S561
VOLUME
7 - 1 • 80 - 76 75 - 72 • 70 - 53
FL501
FLUORESCENT INDICATOR TUBE VF
IC501
GRAPHIC
CONTROL
v
TC
ST
CD B
A
INH
LOAD OUT
LOAD IN
IN SW
OUT SW
X LAT
SQ DATA
SQ CLK
FOCUS SW
CD DATA
CD CLK
X RST
SENS
DF LAT
SCOR
MUTE
L CH
ST CE
TUNED
STEREO
COM DIN
COM CLK
COM DATA
ST L
CAP M ON/OFF
TRIG H/L
B TRG
A TRG
CAP M H/L
LM ON/OFF
PAS/DOL
REC/PB
NR ON/OFF
RM ON/OFF
BIAS ON/OFF
NORM/HIGH
PB A/B
B PLAY
A PLAY
A HALF
B HALF
B SHUT
A SHUT
REC L
PB L
PLAY REC/PB
J801
MD
(AUDIO)
IN
L
DA
CK
62427 LAT
REQ GM
CLK MG
DATA GM
DATA MG
RDY MG
RESET
X1
X2
GR1-12 SEG1-22
VOL B
VOL A
JOG B
JOG A
SIRCS IN
LED SELECT
LED13
LED9
LED4
LED1
KEY4
|
KEY1
DECK
SECTION
(Page 23)
A
TUNER
SECTION
(*)
C
CD
SECTION
(Page 18)
AEP,UK,G,EE MODEL : (Page 21)
JE MODEL : (Page 22)
*
316 7
— MAIN SECTION —
– 19 – – 20 –
HCD-GR5/RX50

TM1
ANTENNA
FM 75Ω
AM
ANT IN IF OUT
F OUT
VT
FE1
FM FRONT END
ST +10V
IF AMP
Q1,2 IF AMP Q3,4
CF1
10.7MHz CF3
10.7MHz 1FM IN
4
27
19 91510
REG
29 AM OSC
AM RF IN
FM
FM OSC
PD1 MW
RV42
FM
TUNED
LEVEL
3
4
5
6
30 14 15 11
FM SD
AM / FM
VCO STOP
IF BUFF MUTE
23
9
5
13
12
2
AM
SD
AM
SD
AM MIX AM IF
IFT41
X42
450KHz
X43
456KHz
X41
10.7MHz
AM
TUNED
LEVEL
RV41
AMP IN L
AMP OUT L
MPX IN
OUT L
OUT R
AM / FM
8
7
STEREO
TUNED
STEREO
TUNED
LPF
RCH
FM / AM MPX
IC41
24 22
20
21
18
16
1411 7212 8124
AM OSC
FM
MW
VCO STOP
FM/AM IF
IF REQ
X IN
X OUT
CE
DI
CL
DO
MUTE
ST-CE
COM-DIN
COM-CLK
COM-DATA
A
MAIN
SECTION
(Page 19)
PLL
IC21
Q5
X21
4.5MHz
• R CH:Same as L CH
• SIGNAL PATH
:FM
:AM
:SW
AM IF
DET
VCO
2
3
13 4 12 11 14 5 15
9
7
10
Q12
MW
SWITCH
Q14
SW
SWITCH
Q13
MW
SWITCH
Q10
SW
SWITCH
MW SWITCH
Q9
FE2
MW FRONTEND
Q8
T1 T2
CV1 CV2
D1
SW TRACKING SW OSC
VOLTAGE
ST L
STEREO
TUNED
MUTE
ST-CE
COM-DIN
COM-CLK
COM-DATA
TM1
ANTENNA
FM 75Ω
COAXIAL
AM
ANT IN IF OUT
F OUT
VT
FE1
FM FRONT END
ST +10V
IF AMP
Q1,2 IF AMP Q3,4
CF1
10.7MHz
CF2
10.7MHz CF3
10.7MHz 1FM IN
5
3
2
26 25 24 23 22 21 20
17
16
15
14
13
12 4
27
6
Q12
MW SW
Q14
LW SW
Q13
MW SW Q11
MW SW
911 191510
LW SW
Q9
REG
29 AM OSC
AM RF IN
FM
FM OSC
PD1 MW
MW
RV42
FM
TUNING
LEVEL
3
4
5
6
30 14 15 11
FM SD
AM / FM VCO STOP IF BUFF MUTE
23
9
5
13
12
2
AM
SD
AM
SD
AM MIX AM IF
IFT41
X42
450KHz
X43
456KHz
X41
10.7MHz
AM
TUNED
LEVEL
RV41
AMP IN L
AMP OUT L
MPX IN
OUT L
OUT R
AM / FM
8
7
STEREO
TUNED
LPF
RCH
FM / AM MPX
IC41
24 22 20
21
18
16
14 7212 8124
AM OSC
FM
VCO STOP
FM / AM IF
IF REQ
X IN
X OUT
CE
DI
CL
DO
A
MAIN
SECTION
(page 19)
PLL
IC21
FE2
MW / LW FRONTEND
• R CH :Same as L CH
• SIGNAL PATH
:FM
:MW
:LW
X21
4.5MHz
AM IF
DET
VCO
Q5
G MODEL
G
MODEL
AEP,UK,EE MODEL
AEP,UK,EE MODEL
EE MODEL
AEP,UK,G MODEL
ST L
Abbreviation
G
EE :German model :East European model
—TUNER SECTION —
(AEP,UK,German,East European MODEL) —TUNER SECTION — (Tourist MODEL)
– 21 – – 22 –
HCD-GR5/RX50