Text preview for : 987385813.pdf part of SONY HCD-DX20 HCD-DX20
HCD-RG30
MINI HIFI COMPONENT SYSTEM
IC501 8-749-016-93 IC STK402-070S
Link73
Back to : 987385813.part1.rar | Home
HCD-DX20/RG30
SERVICE MANUAL AEP Model
UK Model
Ver 1.2 2003.01 HCD-RG30
E Model
HCD-DX20
· HCD-DX20/RG30 is the tuner,
deck, CD and amplifier section in
MHC-DX20/RG30. Photo: HCD-DX20
Model Name Using Similar Mechanism HCD-DX30/RG40
CD CD Mechanism Type CDM58B-K6BD38
Section Base Unit Name BU-K6BD38
Optical Pick-up Name KSM-213DCP
Tape deck
Model Name Using Similar Mechanism NEW
Section
SPECIFICATIONS
Amplifier section SPEAKER: accepts impedance of 6 to 16 ohms
European models: CD player section
HCD-RG30: System Compact disc and digital audio system
DIN power output (rated) 50 + 50 watts (6 ohms at 1 kHz, DIN) Laser Semiconductor laser (=780 nm)
Continuous RMS power output (reference) Emission duration: continuous
60 + 60 watts (6 ohms at 1 kHz, 10% THD) Laser output Max. 44.6 µW*
Music power output (reference) * This output is the value measured at a distance
115 + 115 watts (6 ohms at 1 kHz, 10% THD) of 200 mm from the objective lens surface on
the Optical Pick-up Block with 7 mm aper-
Other models: ture.
HCD-DX20: Frequency response 2 Hz 20 kHz (±0.5 dB)
The following measured at AC 120, 220, 240 V 50/60 Hz Wavelength 780 790 nm
DIN power output (rated) 50 + 50 watts (6 ohms at 1 kHz, DIN) Signal-to-noise ratio More than 90 dB
Continuous RMS power output (reference) Dynamic range More than 90 dB
60 + 60 watts (6 ohms at 1 kHz, 10% THD) CD OPTICAL DIGITAL OUT
Inputs (Square optical connector jack, rear panel)
MD/VIDEO (AUDIO) IN (phono jacks): Wavelength 660 nm
voltage 450/250 mV, impedance 47 kilohms Output Level 18 dBm
GAME (AUDIO) IN (phono jacks):
voltage 450 mV, impedance 47 kilohms -- Continued on next page --
MIC (mini jack): sensitivity 1 mV, impedance 10 kilohms
Outputs
PHONES (stereo mini jack):
accepts headphones of 8 ohms or more
MINI HIFI COMPONENT SYSTEM
9-873-858-13 Sony Corporation
2003A0200-1 Home Audio Company
© 2003.01 Published by Sony Engineering Corporation
HCD-DX20/RG30
Tape deck section NOTES ON HANDLING THE OPTICAL PICK-UP
Recording system 4-track 2-channel stereo BLOCK OR BASE UNIT
Frequency response 40 13,000 Hz (±3 dB), using Sony TYPE I
cassette
The laser diode in the optical pick-up block may suffer electrostatic
Tuner section
break-down because of the potential difference generated by the
FM stereo, FM/AM superheterodyne tuner charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
FM tuner section use the procedure in the printed matter which is included in the
Tuning range 87.5 108.0 MHz repair parts.
Antenna FM lead antenna The flexible board is easily damaged and should be handled with
Antenna terminals 75 ohm unbalanced care.
Intermediate frequency 10.7 MHz
AM tuner section
NOTES ON LASER DIODE EMISSION CHECK
Tuning range
European and Middle Eastern models: The laser beam on this model is concentrated so as to be focused on
531 1,602 kHz (with the interval set at 9 kHz) the disc reflective surface by the objective lens in the optical pick-
Other models: 531 1,602 kHz (with the interval set at 9 kHz) up block. Therefore, when checking the laser diode emission, ob-
530 1,710 kHz (with the interval set at 10 kHz) serve from more than 30 cm away from the objective lens.
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz Laser component in this product is capable
of emitting radiation exceeding the limit for
General Class 1.
Power requirements
European models: 230 V AC, 50/60 Hz
Mexican models: 120 V AC, 50/60 Hz
Other models: 120 V, 220 V or 230 240 V AC, 50/60 Hz
Adjustable with voltage selector
Power consumption
European models: 110 watts
0.5 watts (at the Power Saving Mode)
Other models: 110 watts This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
Dimensions (w/h/d) Approx. 280 x 325 x 421 mm
exterior.
Mass
European models: Approx. 8.5 kg CAUTION
Other models: Approx. 8.5 kg Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radia-
Supplied accessories: AM loop antenna (1) tion exposure.
Remote Commander (1)
Batteries (2)
FM lead antenna (1) Notes on chip component replacement
Front speaker pads (8) · Never reuse a disconnected chip component.
· Notice that the minus side of a tantalum capacitor may be
Design and specifications are subject to change without notice. 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
HCD-DX20/RG30
TABLE OF CONTENTS MODEL IDENTIFICATION
1. SERVICE NOTE .............................................................. 4 -- BACK PANEL -- PARTS No.
2. GENERAL ......................................................................... 5
3. DISASSEMBY ................................................................. 7
4. TEST MODE ................................................................... 13
5. ELECTRICAL ADJUSTMENTS .............................. 17
6. DIAGRAMS
6-1. Circuit Board Location ..................................................... 19
6-2. Block Diagrams Tuner Section ................................... 20
Block Diagrams Main Section .................................... 21
6-3. Printed Wiring Board BD Section ............................... 22
6-4. Schematic Diagram BD Section .................................. 23
6-5. Printed Wiring Board Main Section ............................ 24
6-6. Schematic Diagram Main Section (1/5) ..................... 25
6-7. Schematic Diagram Main Section (2/5) ..................... 26 MODEL PARTS No.
6-8. Schematic Diagram Main Section (3/5) ..................... 27 RG30 4-234-032-2s
6-9. Schematic Diagram Main Section (4/5) ..................... 28
6-10. Schematic Diagram Main Section (5/5) ..................... 29 DX20: E2, E51, EA, SP, AR models 4-234-091-0s
6-11. Printed Wiring Board Power AMP Section ................. 30 DX20: KR, MX, TH models 4-234-091-6s
6-12. Schematic Diagram Power AMP Section ..................... 31
6-13. Printed Wiring Board Panel Section ............................ 32 · Abbreviation
6-14. Schematic Diagram Panel Section ............................... 33 EA : Saudi Arabia model
6-15. Printed Wiring Board Trans Section ............................ 34 SP : Singapore model
6-16. Schematic Diagram Trans Section ............................... 35 TH : Thai model
6-17. Printed Wiring Board Driver Section ........................... 36 KR : Korea model
6-18. Schematic Diagram Driver Section .............................. 36 MX : Mexican model
AR : Argentina model
6-19. IC Pin Function Description ............................................. 37
E51 : Chiri and Peru model
6-20. IC Block Diagrams ............................................................ 40
E2 : Central and South America model
7. EXPLODED VIEWS
7-1. Main Section ..................................................................... 43
7-2. Front Panel Section .......................................................... 44
7-3. Chassis Section ................................................................. 45
7-4. CD Mechanism Deck Section .......................................... 46
8. ELECTRICAL PARTS LIST ...................................... 47
3
HCD-DX20/RG30
Ver1.2 2003.01 SECTION 1
SERVICE NOTE
REMOVING THE PANEL BOARD AND THE KEY BOARD
* The panel board and the key board only are connected to the front panel
by means of hot-melting the plastics.
5 Key board
3 Panel board
1 Connector
13p (CN712)
2 Cut the seven melted-connection points 4 Cut the six melted-connection points
with a cutting plier. with a cutting plier.
Note for installing the panel board and the key board
Key board
Panel board (eight screw holes)
(ten screw holes)
Screw hole
In order to re-install the panel board and the key board,
fix them by using the screws (+BVTP 2.6 × 8 ) respectively.
Screw in to the respective screw holes.
Do not tighten the screws excessively. Hot melt
NOTE FOR CHASSIS EXCHANGE
Apply HANARL SLF-9 (7-400-000-00) to the
position of the figure. : Apply HANARL
Chassis
4
HCD-DX20/RG30
SECTION 3
DISASSEMBLY
Note : Disassemble the unit in the order as shown below.
Set Case (Side-R, Side-L, Top)
CD door
Front panel section Tape mechanism deck Panel board Key board
CD mechanism deck Base unit, BD board
(CDM58B)
Driver board, Moter board, Address sensor board
Chassis section Sub trans board, Video out board, Back panel, Power transformer
(Trans board)
Main board, Power amp board
Note : Follow the disassembly procedure in the numerical order given.
3-1. CASE (SIDE-R, SIDE-L, TOP)
qa Four screws (+BVTP 3 × 10)
qs
Case (Top)
qd
6 Two screws (Case 3 TP2)
Case (Side-L)
qs
8 Screw
(+BVTP 3 × 10)
q;
Case (Side-R)
5
3 Screw
7 Screw (Case 3 TP2) (+BVTP 3 × 10)
9 Screw 1 Two screws
(+BVTT 3 × 8) (Case 3 TP2)
4 Screw
(+BVTT 3 × 8)
2 Screw (Case 3 TP2)
7
HCD-DX20/RG30
3-2. CD DDOR CD door
CD mechanism deck (CDM58B)
1 Turn the pulley to the direction of arrow.
Front panel side
pulley 3
2 Pull-out the disc tray.
3-3. FRONT PANEL SECTION
7 Connector
CD mechanism deck (CDM58B) (CN714)
2 Connector
(CN701)
5
1 Wire (flat type)
(CN102)
4 Screw (+BVTP 3 × 10)
6 Wire (flat type)(CN2)
8 Screw
(+BVTP 3 × 10)
qd
Chassis section
qs
3Screw
(+BVTP 3 × 10)
9 Connector (A Deck)
q; Connector (B Deck)
Front panel section
qa Three screws (+BVTP 3 × 6)
8
HCD-DX20/RG30
3-4. TAPE MECHANISM DECK
1 Six screws
(+BVTP 2.6 × 8)
2 Tape mechanism deck
3-5. PANEL BOARD
3
6 Panel board
4 Connector
(CN712)
2 Vol knob ring
1 Volume knob 5 Cut the seven melted-connection points with a cutting plier.
Note: When attching the panel board,
refer to "Service Note" on page 4.
9
HCD-DX20/RG30
3-6. KEY BOARD
2 Key board
1 Cut the six melted-connection points with a cutting plier.
Note: When attching the Key board,
refer to "Service Note" on page 4.
3-7. SUB TRANS BOARD, VIDEO OUT BOARD, BACK PANEL, POWER TRANSFORMER (TRANS BOARD)
3 Connector (CN2)
9 Video out board Back panel 8 Screw (+BVTP 3 × 10)
1 Two screws
2 Cover (Duct)
(+BVTP 3 × 10)
4 Connector
(CN901)
qa Five screws
5 Connector (+BVTP 3 × 10)
(CN903)
7 Sub trans
board
qf Two screws
(+BVTT 4 × 6)
q; Two screws
Trans board
(+BVTT 3 × 6)
qd Connector (CN915) 6 Two screws
(+BVTP 3 × 10)
qs
qg Two screws
(+BVTT 4 × 6)
qh Power transformer
(T911)
10
HCD-DX20/RG30
3-8. MAIN BOARD, POWER AMP BOARD
7 Heat sink
6 Two screws (+BVTT 3 × 6)
4 Three screws (+BVTT 3 × 6) Main board
5 Power amp board
3 Two screws (+BVTP 3 × 16)
2 Main board
1 Two screws (+BVTT 3 × 6)
3-9. BASE UNIT, BD BOARD
1 Screw (+PTPWH M2.6)
2 Holder (BU) assy
qa q; Screw (DIA. 12)
Base unit qs Two insulators
qs Two insulators
9 Two screws (+PTPWH M2.6)
8 Two stoppers (BU)
7 Two screws (+BVTP 2.6 × 8)
4 Wire (flat type) 16p (CN102)
3 Wire (flat type) 19p (CN101)
6 BD board
5 Screw (+BVTP 2.6 × 8)
11
HCD-DX20/RG30
3-10. DRIVER BOARD, MOTOR BOARD AND ADDRESS SENSOR BOARD
q; Screw (+PTPWH 2.6 × 8)
4 Two screws (+BVTP 2.6 × 8)
8 Motor board
6 Wire (flat type) 8p (CN721)
5 Remove the two solderings of motor.
qs Screw (+BVTP 2.6 × 8)
qa Tray 7 Connector 4p (CN722)
3 Wire (flat type) qd Address sensor board
8p (CN702)
2 Driver board
1 Screw (+BVTP 2.6 × 8)
9 Pull-out the disc tray.
12
HCD-DX20/RG30
SECTION 4
TEST MODE
[MC Cold Reset] [Change-over of AM Tuner Step between 9 kHz and
· The cold reset clears all data including preset data stored in the 10 kHz]
RAM to initial conditions. Execute this mode when returning · A step of AM channels can be changed over between 9 kHz and
the set to the customer. 10 kHz.
Procedure: Procedure:
1. Press three buttons x , ENTER , and ?/1 simultaneously. 1. Press ?/1 button to turn the set ON.
2. The fluorescent indicator tube displays "COLD RESET" and 2. Select the function "TUNER", and press TUNER/BAND
the set is reset. button to select the BAND "AM".
3. Press ?/1 button to turn the set OFF.
[CD Ship Mode] 4. Press ENTER and ?/1 buttons simultaneously, and the display
· This mode moves the pickup to the position durable to vibra- of fluorescent indicator tube changes to "AM 9 k STEP" or
tion. Use this mode when returning the set to the customer after "AM 10 k STEP", and thus the channel step is changed over.
repair.
Procedure: [GC Test Mode]
1. Press 1/u button to turn the set ON. · This mode is used to check the software version, FL tube, LED,
2. Press CD button and 1/u button simultaneously until keyboard, headphone and volume.
"STANDBY" appears. Procedure:
3. When you releaset he buttons, a message "LOCK" is displayed 1. Press three buttons x , ENTER and DISC 2 simultaneously.
on the fluorescent indicator tube, and the CD ship mode is set. 2. LEDs and fluorescent indicator tube are all turned on.
3. When ENTER and DISC2 are pressed at the same time, the
[MC Hot Reset] key number check mode starts up. In this mode, the key numbers
· This mode resets the set with the preset data kept stored in the of each key series are displayed.
memory. The hot reset mode functions same as if the power 4. In the key check mode, the fluorescent indicator tube displays
cord is plugged in and out. "KEY 000". Each time a button is pressed.
Procedure: 5. When ENTER and DISC2 are pressed at the same time, the
1. Press three buttons x , ENTER , and DISPLAY simultaneously. key count check mode starts up. In this mode, the message "KEY
2. The fluorescent indicator tube becomes blank instantaneously, CNT @@" is displayed on the FL display tube. When each
and the set is reset. button is pressed, the key row number is incremented first. Then
the key value is then incremented. However, one the button is
[CD Service Mode] pressed, the key value cannot be counted.
· This mode can run the CD sled motor freely. Use this mode, for 6. When ENTER and DISC2 are pressed at the same time, the
instance, when cleaning the pickup. headphones check mode starts up. In this mode, the message
Procedure: "H_P ON" is displayed when the headphones are inserted. When
1. Press ?/1 button to turn the set ON. the headphones are not inserted. the message "H_P OFF" is
2. Select the function "CD". displayed.
3. Press three buttons x , ENTER , and OPEN/CLOSE simul- 7. When ENTER and DISC2 are pressed at the same time, the
taneously. volume check mode starts up. In this mode, the message
4. The CD service mode is selected. "VOLUME FLAT" is displayed on the FL display tube. When
5. With the CD in stop status, continue to press > to move the the volume control knob is rotated in the positive (+) direction,
pickup to outside track, continue to press . to inside track. the message "VOLUME UP" is displayed. When the volume
6. To exit from this mode, perform as follows: control knob is rotated in the negative (-) direction, the message
1) Move the pickup to the most inside track. "VOLUME DOWN" is displayed.
2) Press three buttons in the same manner as step 2. 8. In order to quit the mode, either press ENTER and DISC2 at
Note: · Always move the pickup to most inside track when exiting from the same time or press the three buttons at the same time as in
this mode. Otherwise, a disc will not be unloaded. step 1.
· Do not run the sled motor excessively, otherwise the gear can be 9. To exit from this mode, press three buttons in the same manner
chipped.
as step 1, or disconnect the power cord.
13
HCD-DX20/RG30
[MC Test Mode] [Microprocessor version display]
· This mode is used to check operations of the respective sections · If the following operation is performed during the POWER OFF
of Amplifier, TUNER, CD and Tape. in the modes other than the POWER SAVE mode (i.e., while the
Demo display shows the watch time),
Procedure: 1. When three buttons of STOP , ENTER , V (CUSOR DOWN)
1. Press the ?/1 button to turn on the set. are pressed at the same time, the MC and the GC microprocessor
2. Press the three buttons of x , ENTER and DISC 3 version numbers are displayed as "M1.00 G1.00".
simultaneously. 2. When three buttons of STOP , ENTER , v (CUSOR UP) are
3. A message "TEST MODE" appears on the FL display tube. pressed at the same time, the model name and destination are
· The messages VACS1 to VACS5 are displayed when the VACS displayed as "BG1 AS1A3".
is changed in this mode.
· The number of repeats of TAPE and CD is set to the infinite
number as the default setting.
4 When v (CURSOR UP) button is pressed, GEQ increases to
its maximum and a message "GEQ MAX" appears.
5. When V (CURSOR DOWN) button is pressed, GEQ decreases
to its minimum and a message "GEQ MIN" appears.
6. When b (CURSOR LEFT) or B (CURSOR RIGHT) button
is pressed, GEQ is set to flat and a message "GEQ FLAT"
appears.
7. In the test mode, the default-preset channel is called even when
the TUNER is selected and an attempt is made to call the preset
channel that has been stored in memory, by operating the Shuttle
knob. (It means that the memory is cleared.)
8. When a tape is inserted in the Deck B and the TAPE B function
is selected, and when the REC PAUSE/START button is
pressed twice, recording starts.
The VIDEO function is selected automatically as the input
source.
9. Select the desired loop by pressing the PLAY MODE button
in the TAPE B function. Insert a test tape AMS-110A or AMS-
RO to Deck A.
10. Press the SPECTRUM button to enter the AMS test mode.
11. After a tape is rewound first, the FF AMS is checked, and the
mechanism is shut off after detecting the AMS signal twice.
12. Then the REW AMS is checked and the mechanism is shut off
after detecting the AMS signal twice.
13. When the check is complete, a message of either OK or NG
appears.
14. When the two buttons of SPECTRUM and DISC1 are pressed
at the same time in any function modes, either the "VACS ON"
display to enable the VACS function or the "VACS OFF" display
to disable the VACS function can be selected.
15. When you want to exit this mode, press the ?/1 button twice.
The cold reset is enforced at the same time.
14
HCD-DX20/RG30
[Aging Mode]
This mode can be used for operation check of CD section and tape deck section.
· If an error occurred:
The aging operation stops and display status.
· If no error occurs:
The aging operation continues repeatedly.
1. Operating method of Aging Mode
Turn on the main power and select "CD" of the function.
1) Set a disc in DISC1 tray. Select ALL DISC CONTINUE, and REPEAT OFF.
2) Load the tapes recording use into the decks A and B respectively.
3) Press three buttons x , ENTER , and
DISC SKIP EX-CHANGE simultaneously.
4) Aging operations of CD and tape are started at the same time.
5) To exit the aging mode, perform [MC Cold Reset].
3. Aging Mode in CD section
1) Display state
· No error occurs Display
AGING[*][*][*][*]
Note:
[*][*][*][*] : Number of aging operations
Error display
E ** s ## $$ %%
12 3 4 5
1 ** The error No. 00 indicates the newest error. As the error No. increases, it means the older error.
When you want to retrieve the error history, press the PLAY MODE button in the case of mechanism error.
Or press the REPEAT button in the case of NO DISC error.
2 s M: Mechanism error D: No disc error
3 ## Don't care 01: FOCUS ERROR
02: GFS ERROR
03: SETUP ERROR
4 $$ High order digits only 01: NO DISC judgment without chucking retry
D: Stopped during closing due to problems other than mechanism. 02: NO DISC judgment after chucking retry
E: Stopped during opening due to problems other than mechanism.
C: Stopped during chucking due to problems other than mechanism.
F: Stopped during EX-opening due to problems other than mechanism.
5 %% Emergency related errors (High order digits only) Status at the time of NO DISC judgment
1: Stopped during chuck-up (High order digits only)
2: Stopped during chuck-down 1: STOP
3: Time out by EX-OPEN 2: SETUP
5: Time out by EX-CLOSE 3: TOC READ
4: ACCESS
5: PLAY BACK
6: PAUSE
7: MANUAL SEARCH (PLAY)
8: MANUAL SEARCH (PAUSE)
· When the buttons x , ENTER and DISC 1 are pressed simultaneously, number of time of the mechanism error and the NO DISC error
can be checked.
Display: EMC**EDC** **: Number of times of error (Maximum three times)
EMC: Mechanism error
EDC: NO DISC error
· When aging operation is complete, be sure to perform the MC Cold Reset to reset the error history.
15
HCD-DX20/RG30
2) Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1) The disc tray opens and closes.
(2) The mechanism accesses DISC 2 and makes an attempt to
read TOC. However, since there are no discs, a message
"CD2 NO DISC" appears.
(3) The mechanism accesses DISC 3 and a message "CD3 NO
DISC" appears.
(4) The disc tray turns to select a disc1.
(5) A disc is chucked.
(6) TOC of disc is read.
(7) The pickup accesses to the track 1, and playing 2 seconds.
(8) The pickup accesses to the last track, and playing 2 seconds.
(9) Every time when an aging operation of step 1 to step 8 is
complete, the display "AGING[*][*][*][*]" value increases
as the number of aging operations is counted up.
(10) Returns to step 1.
3. Aging Mode in Tape Deck section
1) Display state
· No error occurs
Display action now
· Error occurred
Display action last time
NO. Display action Action contents Final timing
TAPE A AG-6 Rewind the TAPE A
1 The top of tape
TAPE B AG-1 Rewind the TAPE B
2 TAPE A AG-2 FWD play the TAPE A 2 minutes playing
20 second FF or the end
3 TAPE A AG-3 F.F. the TAPE A of tape
4 TAPE A AG-4 REV play the TAPE A 2 minutes playing
5 TAPE A AG-5 Rewind the TAPE A The top of tape
6 TAPE B AG-2 FWD play the TAPE B 2 minutes playing
20 second FF or the end
7 TAPE B AG-3 F.F. the TAPE B of tape
8 TAPE B AG-4 REV play the TAPE B 2 minutes playing
9 TAPE B AG-5 Rewind the TAPE B The top of tape
2) Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1) Rewind is executed up to the top of tape A and B.
(2) A tape on FWD side is played for 2 minutes.
(3) FF is executed up to either made for 20 second or the end of
tape.
(4) B tape is reversed, and the tape on REV side is played for 2
minutes.
(5) Rewind is executed up to the top of tape.
(6) Returns to step 2, and repeat steps from 2 to 5.
[Function Change Mode]
* elect either VIDEO or MD of the external FUNCTION input.
Procedure:
1. Turn on the power.
2. Press the two buttons MD (VIDEO) and ?/1 at the same
time.
The main power is turned on and the other function of the
previous function is selected and displayed. "MD" or
"VIDEO".
16
HCD-DX20/RG30
SECTION 5
ELECTRICAL ADJUSTMENTS
FM Tuned Level Adjustment CD SECTION
FM RF Signalgenerator Note :
75 coaxial 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 10M impedance.
set 4. Clean the object lens by an applicator with neutral detergent
Carrier frequency : 98 MHz when the signal level is low than specified value with the
Modulation : AUDIO 1 kHz, 75 kHz FM ANTENNA terminal following checks.
deviation (100%) (TM101)
Output level : 28 dB (at 75 open)
S-Curve Check
Procedure: Oscilloscope
1. Supply a 98 MHz signal at 28 dB from the ANTENNA terminal. BD board
2. Tune the set to 98 MHz.
3. Adjust RV101 to the point (moment) when the TUNED TP(FEO)
indicator will change from going off to going on. TP(VC)
Adjustment Location: MAIN board Procedure :
1. Connect oscilloscope to TP (FEO).
Null Adjustment 2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP (D GND) by lead wire.
FM RF Signalgenerator 4. Turn Power switch on.
5. Load a disc (YEDS-18) and actuate the focus search. (In
75 coaxial
consequence of open and close the disc tray, actuate the focus
search)
6. Confirm that the oscilloscope waveform (S-curve) is
set symmetrical between A and B. And confirm peak to peak level
Carrier frequency : 98 MHz within 4 ±1 Vp-p.
Modulation : AUDIO 1 kHz, 75 kHz FM ANTENNA terminal
deviation (100%) (TM101) S-curve waveform
Output level : 60 dB (at 75 open)
symmetry
Procedure:
1. Supply a 98 MHz signal at 60 dB from the ANTENNA terminal. A
2. Tune the set to 98 MHz.
within 4 ±1Vp-p
3. Measure voltage between pin 21 and pin 23 of IC 101. Adjust
B
T101 ubtil the voltage becomes 0 V.
Adjustment Location: MAIN board 7. After check, remove the lead wire connected in step 2 and 3.
Note : · Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
Adjustment Location · Take sweep time as long as possible and light up the
brightness to obtain best waveform.
[MAIN BOARD] Component side
RF Level Check
T101:NULL oscilloscope
BD board
RV101:FM TUNED LEVEL
T101
TP(RF)
RV101 TP(VC)
RV661:TAPE SPEED
T102
IFT101
Procedure :
RV661
1. Connect oscilloscope to TP (RF).
2. Connect between TP (AGCCON) and TP (D GND) by lead wire.
3. Turned Power switch on.
4. Load a disc (YEDS-18) and playback.
5. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
6. After check, remove the lead wire connected in step 2.
17
HCD-DX20/RG30
Note : Clear RF signal waveform means that the shape " " can be clearly Adjustment Location:
distinguished at the center of the waveform.
[BD BOARD] (Conductor Side)
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.45 ± 0.3Vp-p
E-F Balance (1 Track jump) Check
oscilloscope
BD board
TP
TP(TEO) TP
(XPCK)
TP(VC) (AGCCON)
12
1 21 20
TP IC103
Procedure : (TEO) 24
1. Connect oscilloscope to TP (TEO) and TP (VC). 40 1
TP IC101
2. Turned Power switch on. (FEO) 41 80
3. Load a disc (YEDS-18) and playback the number five track. TP
TP (FEI)
4. Press the gG button. (Becomes the 1 track jump mode.) 60 61
5. Confirm that the level B and A (DC voltage) on the oscilloscope (VC)
waveform. TP
(RF) TP
1 track jump waveform center of (DGND)
waveform
B
A (DC voltage)
0V
level=1.3±0.6Vp-p symmetry
A
Specified level: × 100=less than ±22%
B
6. After check, remove the lead wire connected in step 1.
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point (XPCK) with lead wire.
frequency counter
BD board
TP (XPCK)
2. Turned Power switch on.
3. Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
18
HCD-DX20/RG30
SECTION 6
DIAGRAMS 6-1. CIRCUIT BOARD LOCATION
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. MOTOR board
(In addition to this, the necessary note is printed in each block.)
ADDRESS SENSOR board
Note on Schematic Diagram: Note on Printed Wiring Boards: VIDEO OUT board
· All capacitors are in µF unless otherwise noted. pF: µµF · X : parts extracted from the component side.
50 WV or less are not indicated except for electrolytics · b : Pattern from the side which enables seeing. DRIVER board BD board
and tantalums. · Indication of transistor.
· All resistors are in and 1/4 W or less unless otherwise
specified. SUB TRANS board
C
· ˘ : internal component.
· C : panel designation. These are omitted. Q
TRANS board
B E
Note:
The components identified by mark ! or
dotted line with mark ! are critical for PANEL board
safety. Q
Replace only with part number specified.
B C E
· A : B+ Line. These are omitted.
· B : B Line.
MAIN board
· H : adjustment for repair.
· Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions. · Abbreviation
· Voltages are taken with a VOM (Input impedance 10 M). SP : Singapore model
Voltage variations may be noted due to normal produc- KR : Korea model KEY board POWER AMP board
tion tolerances. MX : Mexican model
no mark : FM AR : Argentina model
( ) : CD TH : Thai model
[ ] : TAPE EA : Saudi Arabia model
· Waveforms are taken with a oscilloscope. E51 : Chiri and Peru model
Voltage variations may be noted due to normal produc- E2 : Central and Aouth model
tion tolerances.
· Circled numbers refer to waveforms.
· Signal path.
F : FM
f : AM
E : PB (DECK A)
d : PB (DECK B)
G : REC (DECK B)
J : CD
c : digital out
· Abbreviation
SP : Singapore model · WAVEFORMS
KR : Korea model
MX : Mexican model BD BOARD MAIN BOARD PANEL BOARD
AR : Argentina model
TH : Thai model 1 IC101 yj 3 IC101 ra 1 IC102 wf STOP MODE 1 IC701 4 STOP MODE
EA : Saudi Arabia model CD PLAY MODE CD PLAY MODE
E51 : Chiri and Peru model
E2 : Central and Aouth model
approx 200mVp-p 4.1Vp-p 5.3Vp-p
6.4Vp-p 222ns
59ns 200ns
(16.9344MHz) (4.5MHz) (5MHz)
2 IC101 ta 4 IC101 el 2 IC401 qd STOP MODE
CD PLAY MODE CD PLAY MODE
approx 170mVp-p 4.0Vp-p
63ns
400nsec/div 1.2Vp-p (16.0MHz)
3 IC401 qa STOP MODE
3.0Vp-p
31µs
(32.768kHz)
19 19
HCD-DX20/RG30
6-2. BLOCK DIAGRAMS
TUNER SECTION
AM/FM
DX20 FRONT-END, IFAMP, MPX
TM101 FE101 Q101 IC101
CF101 RF IF CF102 AMP L-CH · RCH is omitted
1 ANT IN IF OUT 7
AMP
1 FM IF L OUT 11
Q103 A · Signal Path
FM 75 OSC OUT 8
JR109 T101 MAIN
VT 5 5 FM DET R OUT 10 R-CH SECTION : FM
Q102
+B A+12V : AM
AM IF IN 18
FM IF IFT101
PLL IFT101
AM : CD
IC102 AM MIX OUT 19 AM IF
10 FM/AM IF 12 9 IF OUT FM SD ADJ 3 : DIGITAL OUT
FM 7 12 AM/IF RV611 FM SD ADJ
DX20
1 XIN AM OSC 14 24 AM OSC
RG30 MPX 14 RG30