HCD-GRX50/R770/RXD7 are the Amplifier, CD player, Tape Deck and Tuner
section in HMC-GRX50/R770/RXD7.
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.
Photo: HCD-GRX50
CD
Section
Tape deck
Section
Canadian Model
HCD-RXD7
AEP Model
HCD-R770/RXD7
UK Model
HCD-R770
E Model
Australian Model
HCD-GRX50
Model Name Using Similar MechanismNEW
CD Mechanism TypeCDM38LH-5BD32L
Base Unit NameBU-5BD32L
Optical Pick-up NameKSS-213D/Q-NP
Model Name Using Similar MechanismNEW
Tape Transport Mechanism TypeTCM-230AWR2
Amplifier section
Canadian model:
Continuous RMS power output (reference)
70 + 70 watts
(6 ohms at 1 kHz, 10% THD)
Total harmonic distortion less than 0.07%
(6 ohms at 1 kHz, 45 W)
European and Russian models:
DIN power output (rated)80 + 80 watts
(8 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
100 + 100 watts
(8 ohms at 1 kHz, 10% THD)
Music power output (reference)
170 + 170 watts
(6 ohms at 1 kHz, 10% THD)
SPECIFICATIONS
Other models:
The following measured at AC 120, 220, 240 V 50/60 Hz
DIN power output (rated)110 + 110 watts
Outputs
MD OUT:voltage 250 mV,
(phono jacks)impedance 1 kilohms
PHONES:accepts headphones of 8 ohms
(stereo phone jack)or more
SPEAKER:
Canadian model:accepts impedance of 6 to 16 ohms
Other models:accepts impedance of 8 to 16 ohms
SUPER WOOFER (GRX50/RXD7: Canadian models):
Voltage 1 V, impedance 1 kilohm
CD player section
SystemCompact disc and digital audio system
LaserSemiconductor laser (λ=780nm)
Emission duration: continuous
Laser outputMax. 44.6 µW*
*This output is the value measured at
distance of 200 mm from the objective
lens surface on the Optical Pick-up
Block with 7 mm aperture.
Frequency response2 Hz - 20 kHz (±0.5 dB)
Wavelength780 -790 nm
Signal-to-noise ratioMore than 90 dB
Dynamic rangeMore than 90 dB
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wavelength600 nm
Output Level-18 dBm
Tape player section
Recording system4-track 2-channel stereo
Frequency response40 - 13,000 Hz (±3 dB),
(DOLBY NR OFF)using Sony TYPE I cassette
3 Band type:
Middle Eastern models:
MW:531 - 1,602 kHz
(with the interval set at 9 kHz)
SW:5.95 - 17.90 MHz
(with the interval set at 5 kHz)
Other models:
MW:531 - 1,602 kHz
(with the interval set at 9 kHz)
530 - 1,710 kHz
(with the interval set at 10 kHz)
SW:5.95 - 17.90 MHz
(with the interval set at 5 kHz)
AntennaAM loop antenna
Antenna terminalsExternal antenna terminal
Intermediate frequency450 kHz
General
Power requirements
Canadian model:120 V AC, 60 Hz
European and Russian models: 230 V AC, 50/60 Hz
Mexican model:120 V AC, 50/60 Hz
Australian model:230 - 240 V AC, 50/60 Hz
Israel and Thai models:220 V AC, 50/60 Hz
Other models:120 V, 220 V, or 230 - 240 V AC,
50/60 Hz
Adjustable with voltage selector
Power consumption
Canadian model:130 watts
European and Russian models: 165 watts
Other models:160 watts
Dimensions (w/h/d)Approx. 280 × 340 × 395 mm
(111/8 × 131/2× 155/8 in.)
Mass
Canadian model:Approx. 9.2 kg
European and Russian models: Approx. 10.1 kg
Other models:Approx. 10 kg
Supplied accessories:AM loop antenna (1)
Remote Commander (1)
Batteries (2)
FM lead antenna (1)
Speaker cords (2)
Front speaker pads (8)
Design and specifications are subject to change without notice.
UKV tuner section (3 band (FM-AM-UKV) models only)
Tuning range65.0 - 74.0 MHz
Stereo Plus
AM tuner section
Tuning range
2 Band type:
Canadian model:530 - 1,710 kHz
(with the interval set at 10 kHz)
531 - 1,710 kHz
(with the interval set at 9 kHz)
European and Russian 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)
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED
LINE WITH MARK ! ON THE SCHEMATIC DIA GRAMS
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE !
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
7-25. IC Pin Function Description ........................................... 67
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
pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation exposure.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
9.ELECTRICAL PARTS LIST ............................... 82
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
The following caution label is located inside the unit.
CAUTION : INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
ADVARSEL : USYNLIG LASERSTRÅLING VED ÅBNING NÅR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE
FOR STRÅLING.
VORSICHT : UNSICHTBARE LASERSTRAHLUNG, WENN
ABDECKUNG GEÖFFNET UND SICHEREITSVERRIEGELUNG
ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
VARO!: AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALT-
TIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.
VARNING : OSYNLING LASERSTRÅLING NÄR DENNA DEL ÄR ÖPPNAD
OCH SPÄRREN ÄR URKOPPLAD. BETRAKTA EJ STRÅLEN.
ADVERSEL : USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG
SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.
VIGYAZAT!: A BURKOLAT NYITÁSAKOR LÁTHATATLAN LÉZERSU-
GÁRVESZÉLY
!
KERÜLJE A BESUGÁRZÁST!
– 3 –
MODEL IDENTIFICATION
– Rear Panel –
PART No.
MODELPART No.
Argentine model4-214-442-0π
Israel and Thai models4-214-442-6π
120 V AC Area in E model4-215-168-0π
Canadian model4-215-168-1π
R770: AEP, UK, German and
North European models
RXD7: CIS model4-215-168-3π
R770: CIS model4-215-168-4π
RXD7: AEP, German and
North European models
240 V AC Area in E model4-215-168-6π
Saudi Arabia model4-215-168-7π
Singapore model4-215-168-8π
Mexican model4-215-168-9π
Australian model4-220-083-0π
Taiwan model4-220-083-1π
Korean model4-220-083-2π
4-215-168-2π
4-215-168-5π
– 4 –
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF.
1
Remove the Case.
3
Pull-out the disc tray.
2
Turn the cam to the
direction of arrow.
e
NOTE FOR INSTALLATION (ROTARY ENCODER)
BU cam
Section A
Groove
Note:When attaching the BU cam,
engage the Rotary encoder
switch as shown in the figure.
Note:When attaching the Base unit, Insert th
section A into the groove of BU cam.
– 5 –
LOCATION OF CONTOROLS
– Front Panel –
SECTION 2
GENERAL
This section is extracted from
instruction manual.
– Rear Panel –
123
4
5
6
7
8
1 CD DIGITAL OUT terminal
2 VIDEO (AUDIO) IN jack
3 FM COAXIAL ANTENNA terminal
(R770/RXD7: AEP models)
FM ANTENNA terminal
(GRX50/RXD7: Canadian models)
4 MD IN/OUT jack
5 SUPER WOOFER jack
(GRX50/RXD7: Canadian models)
6 SPEAKER terminal
7 AM ANTENN A terminal
8 VOLTAGE SELECTOR switch
(GRX50: 120 V AC Area in E, 240 V AC Area in E, Saudi
Arabia, Singapore, Taiwan, Argentine models)
– 6 –
– 7 –
SECTION 3
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
CASE
2
3
two screws
(case 3TP2) (3
screw
(case 3TP2) (3
×
8)
×
12)
6
case
4
5
4
1
three screws
(BVTP3
2
screw
(case 3TP2) (3
3
two screws
(case 3TP2) (3
×
8)
×
12)
×
8)
LOADING PANEL ASS’Y
A
1
Turn the cam-in the
direction of the arrow
A
2
.
Pull-out
the disc tray.
3
loading panel ass’y
– 8 –
FRONT PANEL SECTION
)
6
screw
(BVTT3
×
10)
9
front panel section
4
screw
(BVTT2.6
3
wire (flat type)
(15 core) (CN303)
5
×
5)
6
screw
(BVTP3
lug
×
10)
2
wire (flat type)
(23 core) (CN501)
5
lug
4
screw
(BVTT2.6
×
5
7
three screws
(BVTT3
×
6)
CD MECHANISM DECK SECTION (CDM38LH-5BD32L)
3
Remove the CD mechanism
deck (CDM38LH-5BD32L)
in the direction of arrows
A
– B.
B
1
screw
(BVTP3
×
10)
1
wire (flat type) (17 core)
(CN304)
A
2
two screws
(BVTP3
×
8)
– 9 –
1
4
screw
(BVTP3
5
wire (flat type) (19 core)
(CN391)
two connectors
(CN392, 393)
×
10)
TAPE MECHANISM DECK SECTION (TCM-230AWR2)
)
2
Open two
cassette lids.
1
Push the cassette lid.
3
three screws
(BVTP2.6
×
8)
3
two screws
(BVTP2.6
4
tape mechanism deck section
(TCM-230AWR2)
×
8)
MAIN BOARD
2
connector
(CN952)
1
Push the cassette lid.
3
connector
(CN953) (GRX50)
4
two screws
(BVTP3
1
wire (flat type)
13 core: EXCEPT AEP, UK, Singapore, Taiwan
(
15 core: AEP, UK, Singapore, Taiwan
(CN371)
6
five screws
(BVTP3
×
8)
×
8)
7
Remove the MAIN board
in the direction of the arrow.
5
two screws
(BVTP3
×
8)
– 10 –
8
connector
(CN403)
(EXCEPT Canadian)
SECTION 4
TEST MODE
[MC Cold Reset]
• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. Turn the power ON or set to the DEMO mode.
2. Press three buttons of p , [ENTER/NEXT], and 1/u simulta-
neously.
3. The set is reset, and displays “COLD RESET”, then becomes
DEMO mode.
[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:
1. Turn the power ON or set to the DEMO mode.
2. Press three buttons of p , [ENTER/NEXT], and [DISC1] si-
multaneously.
3. The set is reset, and becomes standby state.
[Change-over the AM Tuning Interval]
(EXCEPT AEP, UK, and Saudi Arabia models)
• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the 1/u button to turn the power ON.
2. Select the function “TUNER”, and press the [TUNER/BAND]
button to select the BAND “AM”.
3. Press the 1/u button to turn the power OFF.
4. Press the [ENTER/NEXT] and 1/u buttons simultaneously,
and the display on the fluorescent indicator tube changes to
“AM 9 k STEP” or “AM 10 k STEP”, and thus the tuning
interval is changed over.
[CD Service Mode]
• This mode can run the CD sled motor optionally. Use this mode,
for instance, when cleaning the optical pick-up.
Procedure:
1. Press the 1/
2. Select the function “CD”.
3. Press three buttons of p , [ENTER/NEXT], and § simulta-
neously.
4. Set to the Sled Servo mode.
5. With the CD in stop status, turn the JOG dial clockwise to
move the optical pick-up to outside track, or turn it counterclockwise to inside track.
6. To exit from this mode, perform as follows.
1) Move the optical pick-up to the most inside track.
2) Disconnect the power cord.
Notes: • Always move the optical pick-up to most inside track when
u button to turn the power ON.
exiting from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can
be chipped.
[CD Delivery Mode]
• This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.
Procedure:
1. Press the 1/
2. Press the [LOOP] and 1/u buttons simultaneously.
3. A message “LOCK” is displayed on the fluorescent indicator
tube, and the CD delivery mode is set.
[LED and Fluorescent Indicator Tube All Lit, Key Check
Mode]
Procedure:
1. Press three buttons of p , [ENTER/NEXT], and [DISC2] si-
multaneously.
2. LEDs and fluorescent indicator tube are all turned on.
Press the [DISC2] button, and the key check mode is activated.
3. In the key check mode, the fluorescent indicator tube displays
“K 0 J0 V0”. Each time a button is pressed, “K” value increases. However , once a button is pressed , it is no longer taken
into account.
“J” value increases like 1, 2, 3 ... if turn the JOG dial clockwise, or it decreases like 0, 9, 8 ... if turn the JOG dial counterclockwise.
“V” value increases like 1, 2, 3 ... if turn the [VOLUME] dial
clockwise, or it decreases like 0, 9, 8 ... if turn the JOG dial
counterclockwise.
4. To exit from this mode, press three buttons in the same man-
ner as step 1, or disconnect the power cord.
u button to turn the power ON.
– 11 –
[Aging Mode]
This mode can be used for operation check of CD section and tape
deck section.
CD section and tape deck section work in parallel.
• If an error occurred:
The aging operation stops only an error occurred sections and
display then status.
• If no error occurs:
The aging operation continues repeatedly.
Procedure:
1. Set disc in DISC1 tray.
2. Load the tapes into the decks A and B respectively.
3. Press the [PLAYMODE] button to set the “ ALL DISCS” mode,
and press the [REPEAT] button to “REPEAT” off.
4. Press the [FUNCTION] button to select the function “CD”.
5. Press three buttons of p , [ENTER/NEXT], and [DISCSKIP/
EX-CHANGE] simultaneously.
6. The aging mode is activated, if the indicator of disc tray num-
ber on the fluorescent indicator tube is blinking.
7. To exit from the aging mode, press the 1/u button to turn the
power OFF and operate the cold reset. (Refer to the “MC Cold
Reset”)
• Display at an error occurred
1) Display of the error count
(1) Press three buttons of p , [ENTER/NEXT], and [CDSYNC]
simultaneously.
(2) Display of the error count following as below.
Display
EMC**EDC
Notes:
EMC**: The number of mechanical error.
EDC**: The number of no disc error after chucking the disc.
**
2) Display of mechanical error
Display
E**M##$$&&
1. Display at the Aging Mode
• Display operating state of CD section and tape deck section alternately.
• If an error occurred, stop display which that section.
2. CD Section
• Display at the aging mode is the same as the normal operation.
• The sequence during the aging mode is following as below.
Aging mode sequence (CD section) :
Tur n the disc tray
Disc1 chucking
TOC read
Play track1 for 2 seconds
Play last track for 2 seconds
Notes:
: The number of mechanical error.(“00” is latest one)
**
(Press the [PLAYMODE] button to changes next error display)
## : Not used.
$$ : Loading error. (Second figure is not used)
D: The error in the midst of close at the except mechanical trouble.
E : The error in the midst of open at the except mechanical trouble.
C : The error in the midst of chuck up at the except mechanical
trouble.
F : The error in the midst of EX-open at the except mechanical
&&: Loading error. (Second figure in not used)
trouble.
1:The error in the midst of chuck up.
2:The error in the midst of chuck down.
3:Time up of EX-open
4:Time up of EX-close.
3) Display of no disc error
Display
E**D##$$&&
Notes:
: The number of mechanical error.(“00” is latest one)
**
(Press the [REPEAT] button to changes next error display)
##:
01:Focus error
02:GFS error
03:Set up error
$$:
00:No disc error when does not chucking retry.
02:No disc error when chucking retry to completion.
&&: The state when judged no disc error. (Second figure is not used)
1: Stop
2: Set up
3: TOC read
4: Access
5: Play
6: Pause
7: Manual search (Play)
8: Manual search (Pause)
– 12 –
3. Tape Deck Section
• The sequence during the aging mode is following as below.
• If an error occurred, stop display that step.
Aging mode sequence (Tape deck section) :
Rewind the tape A and B
“TAPE A AG-1”
Shut off
FWD play the tape A
“TAPE A AG-2”
2 minutes
Fast forward the tape A
“TAPE A AG-3”
Shut off or 20 seconds
REV play the tape A
“TAPE A AG-4”
2 minutes
Rewind the tape A
“TAPE A AG-5”
Shut off
FWD play the tape B
“TAPE B AG-2”
2 minutes
Fast forward the tape B
“TAPE B AG-3”
Shut off or 20 seconds
REV play the tape B
“TAPE A AG-4”
2 minutes
Rewind the tape B
“TAPE B AG-5”
Shut off
Note: “TAPE * AG-*” is display of each step.
– 13 –
SECTION 5
r
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
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/REW
FWD tension
REV tension
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
71 to 143 g • cm
(0.99 – 1.99 oz • inch)
100 g or more
(3.53 oz or more)
100 g or more
(3.53 oz or more)
DECK SECTION
0 dB=0.775 V
1. Demagnetize the record/playback head with a head demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit adjustment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and RCH.
7. Switches and controls should be set as follows unless otherwise specified.
8. Set to the DOLBY NR OFF.
9. Set to the test mode.
(1) Press the 1/u button to turn the power ON.
(2) Select the function “TAPE A or B”.
(3) Press the button of p , [ENTER/NEXT], and [DISC3]
simultaneously, to set the tape deck test mode and blink
the indicator of disc tray number on the fluorescent indicator tube.
(4) To exit from the test mode, press the 1/u button.
• Test Tape
TapeSignalUsed for
P-4-A10010 kHz, –10 dBAzimuth Adjustment
WS-48B3 kHz, 0 dBTape Speed Adjustment
P-4-L300315 Hz, 0 dBLevel Adjustment
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
main board
MD OUT jack (J101)
L-CH, R-CH
set
level mete
+
–
– 14 –
2. T urn the adjustment scre w 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.
Tape Speed Adjustment
Mode: Playback
test tape
WS-48B
(3 kHz, 0 dB)
DECK B
frequency counter
Output
level
within
1dB
L-CH
peak
R-CH
peak
within
1dB
Screw
position
L-CH
peak
Screw
position
R-CH
peak
3. Mode: Playback
main board
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
MAIN
board
CN301
set
R-CH
in phase 45°90°135°180
MD OUT jack (J101)
L-CH
R-CH
waveform of oscilloscope
good
oscilloscope
wrong
H
V
°
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
set
main board
MD OUT jack (J101)
L-CH, R-CH
+
–
1. Insert the WS-48B into the deck B.
2. Press the ( button on the deck B.
3. Press the [HI-DUB] button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 ± 180 Hz.
5. Press the [HI-DUB] button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 90 Hz.
Adjustment Location: LEAF SW board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
Playback level Adjustment DECK A DECK B
Procedure:
Mode: Playback
test tape
P-4-L300
(315 Hz, 0 dB)
set
main board
MD OUT jack (J101)
L-CH, R-CH
level meter
+
–
Adjustment Location:Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
forward
reverse
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
J101 PB level: 301.5 to 338.3 mV (–8.2 to –7.2 dB) level
difference between the channels: within ±0.5 dB
Adjustment Location: AUDIO board
– 15 –
REC Bias Adjustment DECK B
Procedure:
1. Mode: Record
FUNCTION: VIDEO
main board
VIDEO (AUDIO) IN jack (J101)
L-CH, R-CH
50 mV (–23.8 dB)
600
Ω
AF OSC
1) 315 Hz
2) 10 kHz
attenuator
2. Mode: Playback
set
blank tape
CN-123
Specification values:
J101 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
– MAIN BOARD (Conductor Side) –
RV301
L
IC301
RV351
R
REC LEVEL
VIDEO (AUDIO) IN
J101
MD OUT
(L/R)
(L/R)
recorded
portion
set
main board
MD OUT jack (J101)
L-CH, R-CH
level meter
+
–
3. Confirm playback the signal recorded in step 1 become specification values as follows.
If these values are out of specification values, adjust the R V341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 1and 2.
Specification values: Playback output of 315 Hz to playback
output of 10 kHz: ± 0.5 dB
Adjustment Location: AUDIO board
REC Level Adjustment DECK B
Procedure:
1. Mode: Record
FUNCTION: VIDEO
main board
VIDEO (AUDIO) IN jack (J101)
L-CH, R-CH
AF OSC
315 Hz, 50 mV (–23.8 dB)
Ω
attenuator
600
blank tape
CS-123
set
– AUDIO BOARD (Component Side) –
RV441
RV401
RV301
LR
PB LEVEL
– DECK B –
– LEAF SW BOARD (Component Side) –
TAPE SPEED
(NORMAL) (HIGH)
RV1002
REC BIAS
RV1001
IC602
RL
CN601
RV341
CN1001
RV311
LR
PB LEVEL
– DECK A –
RV411
2. Mode: Playback
recorded
portion
set
main board
MD OUT jack (J101)
L-CH, R-CH
level meter
+
–
3. Confirm playback the signal recorded in step 1 become specification values as follows.
If these values are out of specification values, adjust the R V301
(L-CH) and R V351 (R-CH) on the MAIN board to repeat steps
1 and 2.
– 16 –
CD SECTION
V
+
–
BD board
TP (TE)
TP (VC)
oscilloscope
)
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 10 MΩ 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 (FE)
TP (VC)
+
–
E-F Balance (1 Track Jump) Check
Procedure :
1. Connect oscilloscpe to TP (TE) and TP (VC).
2. Turn the power ON.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the ^ (CD) button. (Becomes the 1 track jump mode)
5. Confirm that the level B and A (DC voltage) on the oscilloscope waveform.
Procedure:
1. Connect oscilloscope to TP (FE).
2. Connect between TP (FE1) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP (GND) by lead wire.
4. Turn the power 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. Cofirm 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
A
B
within 4
±
1 Vp-p
7. After check, remove the lead wire connected in step 2 and 3.
Note: • Try to measure several times to mak e 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
1 track jump waveform
B
0V
level = 1.3
Specified level: × 100 = less than ± 22%
±
0.6 Vp-psymmetry
A
B
A (DC voltage
6. After check, remove the lead wire connected in step 1.
center of
waveform
TP (RF)
TP (VC)
+
–
Procedure:
1. Connect oscilloscope to TP (RF).
2. Connect between TP (AGCCON) and TP (GND) by lead wire.
3. Turn the power ON.
4. Load a disc (YEDS-18) and playback.
5. Confirm that the oscilloscope waveform is clear and check RF
signal level is correct or not.
6. After check, remove the lead wire connected in step 2.
Note: Clear RF signal waveform means that the shape “≈” can be clearly
distinguished at the center of the waveform.
VOLT/DIV: 200 m
TIME/DIV: 500 ns
level:
±
0.3 Vp-p
1.45
– 17 –
Checking Location:
– BD BOARD (Side B) –
TP (VC)
TP (RF)
IC103
IC102
TP (TE)
TP (GND)
TP
(AGCCON)
TP (FE)
TP (FE1)
– 18 –
SECTION 7
DIAGRAMS
7-1.BLOCK DIAGRAM – CD SERVO Section –
RF AMP,
DETECTOR
A
B
C
D
F
E
OPTICAL PICK-UP
(KSS-213D/Q-NP)
LASER DIODE
PD
7
4
2
1
5
I-V AMP
10
6
LD
CD D+5V
10
11
AUTOMATIC
POWER
CONTROL
Q101
FOCUS/TRACKING ERROR AMP
A
5
B
6
C
7
D
8
F
F I-V AMP
E
E I-V AMP
3
IC103
RF
SUMMING
AMP
LD
APC LD
AMP
RF EQ
FOCUS
ERROR AMP
TRACKING
ERROR AMP
APC PD
AMP
AMP
HOLD SW
RFO
LDON
HCD-GRX50/R770/RXD7
FILTER
53
5456
FILO
PCO
CLTV
RFAC
ASYI
ASYO
DIGITAL
CLV
MDP
26
ASYMMETRY
CORRECTION
XRST
3
16
FE
14
TE
13
21
22
PD
4
51
49
48
DIGITAL
SUBCODE
PROCESSOR
XLON
XLAT
DATA
14 5 6
PLL
CPU INTERFACE
CLOK
SENS
8
7
DIGITAL SIGNAL PROCESSOR,
DIGITAL FILTER, D/A CONVERTER
55
FILI
EFM
DEMODULATOR
SERVO AUTO
SEQUENCER
SQSO
SCOR
20
1 2
16K
RAM
SQCK
IC101 (1/2)
CORRECTOR
SERVO
INTERFACE
SCLK
COUT
9 21
D/A
INTERFACE
INTERNAL BUS
ERROR
SSTP
EMPH
WFCK
GFS
64 15
27
ON :
18
S101
(LIMIT)
When the optical pick-up
is inner position.
PCMD
BCK
LRCK
C2PO
SERIAL
IN
INTERFACE
DIGITAL
62
63
61
19
OUT
DOUT
60
DIGITAL
FILTER,
NOISE SHAPER
TO MIRR/DFCT/
FOK DETECTOR
PWM
&
INTEGRATOR
AOUT1
AOUT2
70
77
CLOCK
GENERATOR
X101
CD DIGITALOUT
OPTICAL
OPTICAL
TRANSCEIVER
CD-L
IC381
IC381
A
(Page 23)
BUFFER
TIMING
LOGIC
LOUT1
LOUT2
XTAI
XTAO
72
75
R-CH
66
67
16.9344MHz
AIN1
71
AIN2
76
(TRACKING)
(FOCUS)
05
2-AXIS
DEVICE
M101
(SPINDLE)
M102
(SLED)
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
CH4OUTF
15
M
M
16
17
18
12
11
14
13
CH4OUTR
CH3OUTF
CH3OUTR
CH2OUTF
CH2OUTR
CH1OUTF
CH1OUTR
IC102
MOTOR
DRIVE
MOTOR
DRIVE
COIL
DRIVE
COIL
DRIVE
CH4SIN
CH3FIN
CH3RIN
CH2FIN
CH2RIN
CH1FIN
CH1RIN
MUTE
25
43
39
40
41
FE
TE
SE
24
23
SFDR
28
SRDR
29
5
6
2
3
20
TFDR
30
TRDR
31
FFDR
32
33
FRDR
FOCUS/TRACKING/SLED
RFDC
A/D
CONVERTER
PWM GENERATOR
SERVO DSP
FOCUS/TRACKING/SLED
DIGITAL SERVO
PROCESSOR
IC101 (2/2)
MIRR/DFCT/
FOK
DETECTOR
TO SERVO INTERFACE
FOK
MIRR
DFCT
24
22
23
33
SQ-CLK
32
SQ-DATA
19
SCOR
56
SENSE
37
CD-CLK
58
XLT
CD-DATA
35
HOLD
57
SYSTEM CONTROLLER
(CD MECHANISM CONTROL)
IC501 (1/4)
59
XRST
DISC-SENS
TBL-SENS
OUT-OPEN
ENC1
ENC2
ENC3
LOAD-OUT
LOAD-IN
TBL-L
TBL-R
60
61
71
69
68
66
67
63
65
LEVEL SHIFT
Q701
(OPEN/CLOSE DET)
470
ROTARY
2
ENCODER
S811
3
DISC TRAY SLIDE MOTOR DRIVE
FIN
10
RIN
2
DISC TRAY TURN MOTOR DRIVE
IN1
3
IN2
6
DISC TRAY SENSOR
S801
CLOSE
OPEN
IC801
MOTOR
DRIVE
IC701
MOTOR
DRIVE
DISC IN DETECT
SENSOR
IC703
IC702
DISC TRAY
ADDRESS DETECT
OUT1
7
OUT2
4
OUT1
7
OUT2
2
M
(DISC TRAY SLIDE)
M
(DISC TRAY TURN)
M801
M701
– 19 –– 20 –
• SIGNAL PATH
: CD PLAY (ANALOG OUT)
: CD PLAY (DIGITAL OUT)