Sony HCD-W550 Schematic
HCD-W550
SERVICE MANUAL
• HCD-W550 is the deck, CD section
in MHC-W550/W770AV.
Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY” and the double-D symbol a are trademarks
of Dolby Laboratories Licensing Corporation.
CD
Section
Tape deck Model Name Using Similar Mechanism HCD-GR5/RX50
Section T ape T ransport Mechanism T ype TCM-220WR2E
Canadian Model
AEP Model
UK Model
E Model
Australian Model
T ourist Model
Model Name Using Similar Mechanism HCD-GR8/RX90
CD Mechanism Type CDM38-5BD29A
Base Unit Name BU-5BD29A
CD player section
system Compact disc and digital
audio system
Laser Semiconductor laser
(l = 780 mm)
Emission duration :
continuous
Laser output Max. 44.6 mW*
*This output is the value
measured at a distance of
200 mm from the
objective lens surface on
the Optical Pick-up Block
with 7 mm aperture.
Frequency response 2Hz - 20 kHz (± 0.5dB)
Wavelenght 780 - 790 mm
Signal to noise ratio More than 90 dB
Dynamic renge More than 90 dB
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wavelength 600 mm
Output Level - 18 dBm
SPECIFICATIONS
T ape player section
Recording system 4 track 2 channel stereo
Frequency response 60 - 13,000 Hz (± 3dB),
(DOLBY NR OFF) using Sony TYPE I
cassette
60 - 14,000 Hz (± 3 dB),
using Sony TYPE II
cassette
General
Dimensions (w / h / d)Approx. 280 ¥ 205 ¥ 359
mm
Mass Approx. 4.3 kg
Design and specifications are subject to change without
notice.
MICROFILM
STEREO CASSETTE DECK CD PLAYER
T ABLE OF CONTENTS
1. GENERAL ······································································ 3
2. DISASSEMBLY
2-1. Back Panel, CD Block Removal·········································4
2-2. Cassette Lid (A)/(B) Assy, Mechanism Deck Removal ···· 4
2-3. Main Board, Resistor Board, Front Panel Assy Removal ·· 5
3 . ADJUSTMENTS
3-1. Mechanical Adjustment ······················································ 6
3-2. Electrical Adjustment ·························································6
4 . DIAGRAMS
4-1. Block Diagram ································································· 11
4-2. Circuit Boards Location ···················································13
4-3. Schematic Diagram — Audio Section —·························14
4-4. Printed Wiring Board — Audio Section — ······················ 17
4-5. Printed Wiring Board — BD Section — ·························· 19
4-6. Schematic Diagram — BD Section — ····························· 21
4-7. Printed Wiring Board — Motor Section —······················23
4-8. Schematic Diagram — Motor Section — ························25
4-9. Schematic Diagram — Panel Section — ························· 27
4-10. Printed Wiring Board — Panel Section —······················· 29
4-11. Printed Wiring Board — Main Section — ······················· 32
4-12. Schematic Diagram — Main Section — ·························· 35
4-13. IC Block Diagrams ··························································· 38
4-14. IC Pin Function ································································ 40
5 . EXPLODED VIEWS
5-1. Main Section····································································· 42
5-2. Front Panel Section ·························································· 43
5-3. CD Mechanism Deck Section-1 (CDM38-5BD29A) ····· 44
5-4. CD Mechanism Deck Section-2 (CDM38-5BD29A) ····· 45
5-5. Base Unit Section (BU-5BD29A) ····································46
5-6. Tape Mechanism Deck Section-1 (TCM-220WR2E) ······ 47
5-7. Tape Mechanism Deck Section-2 (TCM-220WR2E) ······ 48
6 . ELECTRICAL P ARTS LIST ···································49
SERVICING NOTE
• Supplying power during servicing
This equipment cannot operate without using a separate power supply. Connect to the STR-W550/W770AV when performing service
work.
T o apply power set the SYSTEM POWER switch on the Tuner/Amp to ON.
When other units are not available use the PFJ-1 power supply jig.
When using the PFJ-1, simultaneously press the CD STOP button and the DECK A ) (fast rightward) button to turn on the power.
[Connection Diagram]
FH-E939,838,737,
MHC-6600,5600,
CDP/TC
PFJ-1
(Power Supply Jig)
POWER SW
Connector Cable 17P
(Supplied with set)
Conversion Board
(J-2501-138-A)
Set
CNB108 17P
SYSTEM CONTROL
— 2 —
SECTION 1
GENERAL
123 456 7
8
9
@∞
@¢
@£
@¡
@™
1 DISC SKIP EX-CHANGE Button (CD)
2 0 Button (CD)
3 ) Button (CD)
4 DISC 1 Button (CD)
5 DISC 2 Button (CD)
6 DISC 3 Button (CD)
7 6 OPEN/CLOSE Button (CD)
8 ·P Button (CD)
9 p Button (CD)
!º · Button [B] (DECK)
!¡ ª Button [B] (DECK)
!™ π Button [B] (DECK)
!£ ) Button [B] (DECK)
!ª
@º
!º
!¡
!™
!¶
!•
!¢ 0 Button [B] (DECK)
!∞ DIRECTION MODE Button (DECK)
!§ P AUSE Button (DECK)
!¶ REC Button (DECK)
!• HI-SPEED DUBBING Button (DECK)
!ª CD SYNCHRO Button (DECK)
@º DOLBY NR Button (DECK)
@¡ ) Button [A] (DECK)
@™ 0 Button [A] (DECK)
@£ π Button [A] (DECK)
@¢ ª Button [A] (DECK)
@∞ · Button [A] (DECK)
!∞
!§
!£
!¢
— 3 —
SECTION 2
DISASSEMBL Y
Note : Follow the disassembly procedure in the numerical order given.
2-1. BACK P ANEL, CD BLOCK REMOV AL
8
CD block
7
Screw
+BVTP 3
×
10
CASE
Unscrew the five case attachment in the screws (case)
(M3 × 8) × 4, (+BV 3 × 8) × 1 and remove the case.
2
Back panel
1
Screw
+BVTP 3
×
10
6
Screw
+BVTP 3
2-2. CASSETTE LID (A)/(B) ASSY, MECHANISM DECK REMOVAL
1 Press the EJECT button and open the cassette lid.
Mechanism Deck (TCM-220WR2E)
7
+BVTP 2.6
5
Screw
3
4
CN112 (9 pin)
CN111 (8 pin)
×
10
×
8
1
Screw
+BVTP 3
Flat wire (19 core)
2
×
10
1
3
1
8
6
Screw
+BVTP 3
— 4 —
4
Flat wire (11 core)
5
Flat wire (21 core)
×
8
2-3. MAIN BOARD, RESISTOR BOARD, FRONT P ANEL ASSY REMOV AL
d
3
2
Front panel assy
Screw
+BVTP 3
1
+BVTP 3
Screw
×
8
6
Screw
+BVTP 3
×
8
4
Bracket (H/S)
5
Resistor board
×
8
7
Main boar
• Tray (Slide) getting out pr ocedure on the power supply is OFF
Rotate the BU CAM assembly in the direction of the arrow and pull out the slide.
Tray (Slide)
— 5 —
1
BU CAM assy
SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENT
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head pinch roller
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.
• T orque Measurement
Mode T orque Meter Meter Reading
Forward CQ-102C
Forward
Back Tension (0.028 – 0.083 oz•inch)
Reverse CQ-102RC
Reverse
Back Tension (0.028 – 0.083 oz•inch)
FF, REW CQ-201B
CQ-102C
CQ-102RC
36 to 61g•cm
(0.50 – 0.84 oz•inch)
2 to 6g•cm
36 to 61g•cm
(0.50 – 0.84 oz•inch)
2 to 6g•cm
61 to 143g•cm
(0.85 – 1.99 oz•inch)
3-2. ELECTRICAL ADJUSTMENT
DECK SECTION
1. The adjustment should be performed in the publication.
(Be sure to make playback adjustment at first.)
2. The adjustment and measurement should be performed for both
L-CH and R-CH.
• Switch position
DOLBY NR switch : OFF
FUNCTION button : OFF
EFFECT switch : OFF
DBFB switch : OFF
3. Deck section electrical adjustments are made in test mode by
press key switch same time CD STOP DECK A STOP and
DECK B STOP button.
4. Input point and output level measurement point.
• T ape T ension Measurement
Mode T ension Meter Meter Reading
Forward CQ-403A
Reverse CQ-403R
more than 100 g (3.53 oz)
more than 100 g (3.53 oz)
• Test T ape
T ap e Signal Used for
P-4-A100 10 kHz, –10 dB
P-4-L300 315 Hz, 0dB Level Adjustment
WS-48B 3 kHz, 0dB Tape Speed Adjustment
0 dB=0.775V
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Procedure:
1. Forward Playback mode
Reverse Playback mode
Head Azimuth Adjustment
— 6 —
2. Turn the adjustment screw for the maximum output levels. If
t
these levels do not match, turn the adjustment screw until both
of output levels match together within 1 dB.
3. Playback Mode
T ape Speed Adjustment DECK A DECK B
Note: Start the Tape Speed adjustment as below after setting to the
test mode.
Set to test mode. (Press key switch same time CD STOP
DECK A STOP and DECK B STOP button.)
T est mode of f. (Power off.)
Procedure:
• Perform high speed adjustment before normal speed adjustment.
Mode: Playback
4. Change the playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location:
— Record/playback head (Deck A and B) —
Speed
*High
Normal
Deck
A
B
A
B
Adjustment
RV652
RV652
RV651
RV651
Frequency counter
5,910 to 6,090 Hz
2,910 to 3,090 Hz
* Continue to press HIGH SPEED DUBBING switch (S259) in
playback mode : High speed playback.
Frequency difference between the beginning and the end of the
tape should be within ± 3%.
Frequency difference between deck A and deck B the beginning
of the tape should be within 1.5 %.
Adjustment Location: AUDIO board (See page 8)
Sample Value of W ow and flutter
W.RMS (JIS) within 0.3%
(test tape: WS-48B)
Playback level Adjustment DECK A DECK B
Procedure:
— FWD playback Mode —
test tape
P-4-L300
(315 Hz, 0 dB)
VTVM
set
Output level measurement poin
(See page 6)
+
–
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:
LINE OUT level : –8.2 to –7.2 dB (301.5 to 338.3 mV)
Level Difference between Channels : within 0.5 dB
Confirm the OUTPUT level does not change in playback mode
while changing the mode from playback to stop several times.
Adjustment Location: AUDIO board (See page 8)
— 7 —
Record Bias Adjustment DECK B
)
Procedure:
1. Record mode
1) 315 Hz
2) 10 kHz
AF OSC
attenuator
69.0mV (–23.8dB) : STR-W550/W770AV
38.8mV (–26dB) : jig (PFJ-1)
set
blank tape
CS-123
Adjustment Level:
OUTPUT level: –23.8 dB ± 1.0 dB (56.1 to 44.6 mV)
Adjustment Location: MAIN board
Adjustment Location :
[AUDIO BOARD] — Component Side —
RV301 : Playback Level (Deck B L-CH)
RV401 : Palyback Level
(Deck B R-CH)
RV651 : Tape Speed (Normal)
Input point (See page 6)
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
4. If these levels do not adjustment level, adjustment the RV341
(L-CH) and RV441 (R-CH) to repeat steps 1 and 4.
Adjustment level: Playback output of 315 Hz to playback output
of 10 kHz: 0 ± 1.0 dB (0 ± 4.5mV).
Adjustment Location: AUDIO board
Record Level Adjustment DECK B
Procedure:
1. Record mode
RV341 : Record Bias (L-CH)
RV441 : Record Bias (R-CH)
RV411 : Playback Level (Deck A R-CH)
[MAIN BOARD] — Component Side —
RV451 Record Level (R
CNB108
RV401 Record Level (L)
RV652 : Tape Speed
(Hight)
RV311 : Playback Level
(Deck A L-CH)
2. Playback mode
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
4. If these levels do not adjustment level, adjustment the RV401
(L-CH) and RV451 (R-CH) to repeat steps 1 and 4.
— 8 —
CD SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M 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.
Focus Bias check
Procedure:
1. Connect oscilloscope to test point TP (RF). (GND terminal :
VC)
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that the shape “ ” can be clearly distinguished at the
center of the waveform and check the RF signal level.
• RF signal
S Curve Check
Procedure:
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and GND 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 3±1
Vp-p.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Note: • T ry 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:
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
— 9 —
E-F Balance (1 T rack Jump) check
)
(Without remote commander)
Procedure:
1. Connect oscilloscope to test point TP (TEO) on BD board.
2. T urned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “P (Pause)” button. (Becomes the 1 track jump mode)
5. Check the level B of the oscilloscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following:
A – B
2 (A + B)
1 track jump waveform
× 100 = ±7 (%)
Center of the waveform
B
0V
±
level : 500 mV
100 mVp-p
Adjustment Location:
[BD BOARD] (Conductor Side)
RF
FOK
IC101
CNU101
TEO
GND
FEO
IC103
symmetry
VC
IC
I02
A (DC voltage
CNU102
— 10 —
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