Sony HCD-EP303 Service Manual
HCD-EP303
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
SERVICE MANUAL
COMPACT DISC DECK RECEIVER
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-873-621-02
2002K1600-1
© 2002.11
HCD-EP303 is the amplifler, CD
player, tape deck and tuner section in
CMT-EP303.
SPECIFICATIONS
Ver 1.1 2002. 11
CD
Model Name Using Similar Mechanism HCD-EP30/EP40
SECTION
CD Mechanism Type CS-21SC-1280
TAPE DECK
Model Name Using Similar Mechanism HCD-EP30/EP40
SECTION
Tape Transport Mechanism Type TCM125-2
— Continued on next page —
Amplifier section
AUDIO POWER SPECIFICATIONS:
(U.S.A. model only)
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
with 4 Ω loads both channels driven, from 120
- 10,000 Hz; rates 6 W per channel minimum
RMS power, with no more than 10% total
harmonic distortion from 250 mW to rated
output.
Canadian model:
Continuous RMS power output (reference)
6 + 6 W
(4 Ω at 1 kHz, 10% THD)
European model:
DIN power output (rated) 4.5 + 4.5 W
(4 Ω at 1 kHz, DIN)
Continuous RMS power output (reference)
6 + 6 W
(4 Ω at 1 kHz, 10% THD)
Music power output (reference)
13 + 13 W
Other model:
The following measured at AC 230 V or AC 120 V,
50/60 Hz
DIN power output (rated) 4.5 + 4.5 W
(4 Ω at 1 kHz, DIN)
Continuous RMS power output (reference)
6 + 6 W
(4 Ω at 1 kHz, 10% THD)
Outputs
PHONES: Accepts headphones of
(stereo mini jack) 8 Ω or more
SPEAKER: Accepts impedance of 4 to
16 Ω
CD player section
System Compact disc and digital
audio system
Laser Semiconductor laser
(λ=780 nm)
Emission duration:
continuous
Frequency response 20 Hz - 20 kHz (±0.5 dB)
Tape player section
Recording system 4-track 2-channel stereo
Frequency response 50 - 13 000 Hz (±3 dB),
using Sony TYPE I
cassette
2
HCD-EP303
TABLE OF CONTENTS
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 - 108.0 MHz
Antenna FM lead antenna
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Pan-American model: 530 - 1 710 kHz
(with the interval set at
10 kHz)
531 - 1 602 kHz
(with the interval set at
9 kHz)
European model: 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)
Antenna Built-in ferrite bar antenna
Intermediate frequency 450 kHz
General
Power requirements
North American model: 120 V AC, 60 Hz
European model: 230 V AC, 50/60 Hz
Australian model: 230 V AC, 50/60 Hz
Mexican model: 120 V AC, 60 Hz
Argentine model: 220 - 230 V AC, 50/60 Hz
Other models: 230 V AC, 50/60 Hz
Power consumption
U.S.A. model: 25 W
Canadian model: 25 W
European model: 30 W
0.5 W (in the standby
mode)
Other models: 30 W
Dimensions (w/h/d):
Approx. 145 × 240 × 252 mm
Mass: Approx. 2.9 kg
Design and specifications are subject to change
without notice.
1. SERVICING NOTES······················································ 4
2. GENERAL ·········································································· 5
3. DISASSEMBLY ································································ 7
3-1. Front Panel Section······················································· 7
3-2. MAIN Board ································································· 8
3-3. Tape Mechanism Deck (TCM125-2) ··························· 8
3-4. POWER Board, Power Transformer ···························· 9
3-5. DISPLAY Board, HEADPHONE Board ·····················9
3-6. CD Cabinet Section ··················································· 10
3-7. CD Mechanism Deck (CS-21SC-1280)····················· 10
3-8. Cassette Lid ······························································· 11
4. MECHANICAL ADJUSTMENTS ····························· 12
5. ELECTRICAL ADJUSTMENTS ······························· 12
6. DIAGRAMS······································································ 16
6-1. Circuit Boards Location·············································· 16
6-2. Block Diagrams ·························································· 18
6-3. Printed Wiring Board MAIN Section ························ 21
6-4. Schematic Diagram MIAN Section (1/2) ·················· 22
6-5. Schematic Diagram MIAN Section (2/2) ·················· 23
6-6. Printed Wiring Board CASSETTE Section ···············24
6-7. Schematic Diagram CASSETTE Section ·················· 24
6-8. Printed Wiring Board DISPLAY Section ·················· 25
6-9. Schematic Diagram DISPLAY Section ····················· 26
6-10. Printed Wiring Board POWER Section ····················· 27
6-11. Schematic Diagram POWER Section························ 28
6-12. IC Pin Function Description ······································· 31
7. EXPLODED VIEWS ······················································ 32
7-1. Cabinet Section ··························································· 32
7-2. Front Panel Section -1 ················································ 33
7-3. Front Panel Section -2 ················································ 34
7-4. CD Cabinet Section ···················································· 35
8. ELECTRICAL PARTS LIST ······································· 36
3
To Exposed Metal
Parts on Set
0.15 µF
1.5 kΩ
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
The following caution label is located inside the unit.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
HCD-EP303
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY .
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS P AR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage. Check
leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester , such as the Simpson 229 or RCA
WT -540A. Follow the manuf acturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC v oltmeter . The “limit” indication
is 0.75 V, so analog meters must have an accurate lo w-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V A C range are suitable. (See
Fig. A)
4
HCD-EP303
SECTION 1
SERVICING NOTES
• MODEL IDENTIFICATION
– Bottom View –
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.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
1. Press the ?/1 button to the power ON with no disc inserted
and press the CD button.
2. Open the lid for CD.
3. Turn on SW600 as following figure.
4. Confirm the laser diode emission while observing the objecting
lens. When there is no emission, Auto Power Control circuit or
Optical Pick-up is broken.
Objective lens moves up and down five times for the focus
search.
SW600
PART No.
at least 30 mm.
CASSETTE board
MAIN board
HEADPHONE
board
at least 30 mm
heatsink
MODEL PART No.
AEP, UK models 4-235-972-0
<
EXCEPT AEP, UK models 4-241-498-0
<
TO PREVENT ‘TAPE OSCILLATION SOUND AT VOLUME’
MAXIMUM SETTING (W/O TAPE)
Headphone wire dressing:
a.) Draw the wire from Main board to Headphone board along the
bottom side of heatsink.
b.)The wire must be kept away from the top side of Cassette board
5
HCD-EP303
SECTION 2
GENERAL
This section is extracted
from instruction manual.
Main unit
R – Z
Remote sensor q;
REPEAT (8)
SHUFFLE (8)
TAPE (12)
TIMER indicator (15)
TUNER (10, 11, 13)
TUNER MEM (10)
TUNING +/– (10, 11)
VOLUME control
ALPHABETICAL ORDER
A – P
Cassette compartment qd (12)
CD 4 (8, 9, 13)
Display Window 5 8, 9, 10)
ENTER/PGM 8, 9, 10, 14)
MEGA BASS (14)
MUSIC MENU 9 (14)
PHONES jack
PRESET +/– (10, 11)
BUTTON DESCRIPTIONS
@/1 (power) (6)
CD
.m /M> (go back/go
forward) (8, 9)
u (play/pause) (8, 9)
Z PUSH OPEN/CLOSE (8)
x (stop) (8)
TAPE
M (fast forward) (12)
X (pause) (12, 13)
N (play) (12)
z (recording) (13)
m (rewind) (12)
xZ (stop/eject) (12, 13)
w;
8
ws
qs
2
wa
3
1
6
w;
wd
qa
wh
wd
wf
7
wg
qh
qf
qk
ql
qj
qg
6
HCD-EP303
Setting the clock
1 Turn on the system.
2 Press CLOCK/TIMER/SLEEP SET on
the remote.
3 Press CLOCK/TIMER + or – on the
remote repeatedly to set the clock.
4 Press TUNER MEM/ENTER/PGM on the
remote.
The clock starts working.
To adjust the clock
Perform from step 2.
Note
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.
Remote control
ALPHABETICAL ORDER
A – P
CD/REMAIN (7, 8, 9, 13, 15,
16)
CLOCK/TIMER + (7, 14, 15)
CLOCK/TIMER – (7, 14, 15)
CLOCK/TIMER/SLEEP SET
(7, 14, 15)
MEGA BASS (14)
MUSIC MENU (14)
MUTING (14)
PRESET +/– (10, 11)
R – Z
REPEAT (8)
SHUFFLE (8)
TAPE (12)
TIMER ON/OFF (15)
TUNER/BAND (10, 11, 13)
TUNER MEM/ENTER/PGM
(7, 9, 10, 14, 15)
TUNING + (10, 11)
TUNING – (10, 11)
VOL (volume) +/–
BUTTON DESCRIPTIONS
m (rewind) M (fast forward)
qg (8)
. (go back) > (go forward)
qg (8, 9)
u (play/pause) qh (8, 9)
@/1 (power) 3 (6)
x (stop) qj (8, 9, 12)
ql
8
qd
1
qs
qa
q;
qf
6
5
qk
2
4
8
qd
9
7
7
HCD-EP303
SECTION 3
DISASSEMBLY
• The equipment can be removed using the following procedure.
3-6. CD CABINET SECTION
(Page 10)
3-5. DISPLAY BOARD,
HEADPHONE BOARD
(Page 9)
3-1. FRONT PANEL SECTION
(Page 7)
3-3. TAPE MECHANISM DECK
(TCM125-2)
(Page 8)
3-7. CD MECHANISM DECK
(CS-21SC-1280)
(Page 10)
3-8. CASSETE LID
(Page 11)
3-2. MAIN BOARD
(Page 8)
3-4. POWER BOARD,
POWER TRANSFORMER
(Page 9)
SET
3-1. Front Panel Section
8
connector
(CN203)
5
two screws
(+K3
×
5)
3
two screws
(+BTP2.6
×
10)
1
screw
(+BVTP3
×
10)
4
two screws
(+BVTP3
×
10)
5
two screws
(+K3
×
5)
5
two screws
(+K3
×
5)
9
connector
(CN402)
0
connector
(SW600)
qa
front panel section
7
2
antenna cover cabine
t
6
claw
Note : Follow the disassembly procedure in the numerical order given.
8
HCD-EP303
3-2. MAIN Board
6
connector
(CN202)
5
connector
(CN201)
4
connector
(CN302)
3
connector
(CN301)
2
connector
(CN101)
1
connector
(CN204)
0
MAIN board
8
claw
7
screw
(+BTP2.6
×
8)
9
3-3. Tape Mechanism Deck (TCM125-2)
4
CASSETTE boar
d
3
1
connector
(CN701)
2
two screws
(+BTP2.6
×
6)
6
two screws
(+BVTP3
×
10)
6
two screws
(+BVTP3
×
10)
7
tape mechanism deck
5
Open the cassette lid.
9
HCD-EP303
3-4. POWER Board, Power Transformer
9
screw
(+BTP2.6
×
8)
3
screw
(+BVTP3
×
10)
1
screw
(+BVTP3
×
10)
4
four screws
(+BVTP3
×
12)
6
power transformer
5
POWER board
q;
power pwb mounting bkt
2
ac cord holder
7
Remove four solderings.
8
Remove four solderings.
rear cabinet assy
3-5. DISPLAY Board, HEADPHONE Board
3
screw
(+PTPWH2.6
×
10)
5
HEADPHONE board
4
reteiner board
2
DISPLAY board
1
seven screws
(+BTP2.6
×
10)
10
HCD-EP303
3-6. CD Cabinet Section
1
two screws
(+BTP2.6
×
8
)
2
CD cabinet section
3-7. CD Mechanism Deck (CS-21SC-1280)
1
two screws
(BVTP3
×
10)
4
CD cover housing
8
vibration proof rubber
(pink)
8
vibration proof rubber
(pink)
6
four fiber washers
5
four pulley screws
8
vibration proof rubber
(orange)
8
vibration proof rubber
(orange)
9
CD mechanism deck (CS-21SC-1280)
6
3
7
two spring clamps
7
two spring clamps
2
Remove the connector.
11
HCD-EP303
3-8. Cassette Lid
1
Push stop/eject key.
4
cassette lid
3
claw
3
claw
2
12
HCD-EP303
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
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. (Do not bring the head magnetizer close to the
erase head.)
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
Tape Tension Measurement
Mode Torque Meter Meter Reading
FWD CQ-403A more than 100 g
(more than 3.53 oz)
PRECAUTION
1. Setting
MEGA BASS switch : OFF
TAPE DECK SECTION 0 dB=0.775 V
Test tape
Mode Torque Meter Meter Reading
2.95 – 6.86 mN•m
FWD CQ-102C (30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
0.15 – 5.39 mN•m
FWD
CQ-102C (1.5 – 5.5 g•cm)
Back Tension
(0.021 – 0.076 oz•inch)
more than 5.89 mN•m
FF CQ-201B (more than 60 g•cm)
(more than 0.83 oz•inch)
more than 5.89 mN•m
REW CQ-201B (more than 60 g•cm)
(more than 0.83 oz•inch)
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
P-4-A063 6.3 kHz, –10 dB Head Azimuth Adjustment
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
set
HEADPHONE board
PHONES jack (JK401
)
32
Ω
+
–
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
test tape
P-4-A063
(6.3 kHz, –10 dB)
L-CH
R-CH
HEADPHONE board
PHONES jack (JK401)
oscilloscope
V
H
+
+
–
–
screen pattern
in phase
good wrong
45
°
90
°
135
°
180
°
32
Ω
32
Ω
set
13
HCD-EP303
Tape Speed Adjustment
Setting:
Function: T APE
Procedure:
1. Playback WS-48A (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor (M201) so that
the frequency counter reading becomes 3,000 Hz.
Specified Value: 2,910 to 3,090 Hz
3. Confirm that the frequency at the beginning and that at the end
of tape winding are between 2,955 to 3,045 Hz.
Adjustment Location:
frequency counte
r
test tape
WS-48A
(3 kHz, 0 dB)
set
HEADPHONE board
PHONES jack (JK401)
–
+
32
Ω
CAPSTAN/REE
L
motor (M201)
Tape Speed
Adjustment
Adjustment Location: Record/Playback Head.
Note: Refer to “3-8. Cassette Lid” (see page 11)
adjustment screw
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