Sony HCD-EP305 Service Manual

HCD-EP305
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SERVICE MANUAL
Ver 1.0 2002. 05
TEL 13942296513 QQ 376315150 892498299
HCD-EP305 is the amplifler, CD player , tape deck and tuner section in CMT-EP305.
CD
SECTION
TAPE DECK
SECTION
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Model Name Using Similar Mechanism HCD-EP30/EP40 CD Mechanism Type CS-21SC-1280 Model Name Using Similar Mechanism HCD-EP30/EP40 Tape T ransport Mechanism Type TCM125-2
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AEP Model
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TEL 13942296513 QQ 376315150 892498299
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13942296513
Amplifier section
DIN power output (rated) 4.5 + 4.5 W Continuous RMS power output (reference)
Music power output (reference) Outputs
PHONES: Accepts headphones of (stereo mini jack) 8 or more SPEAKER: Accepts impedance of 4 to
CD player section
System Compact disc and digital Laser Semiconductor laser
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),
SPECIFICATIONS
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(4 at 1 kHz, DIN) 6 + 6 W
(4 at 1 kHz, 10% THD) 13 + 13 W
16
audio system (λ=780 nm)
Emission duration: continuous
using Sony TYPE I cassette
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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
Antenna Built-in ferrite bar antenna Intermediate frequency 450 kHz
General
Power requirements 230 V AC, 50/60 Hz Power consumption 30 W
Dimensions (w/h/d): Mass: Approx. 2.9 kg
Design and specifications are subject to change without notice.
531 -1 602 kHz (with the interval set at 9 kHz)
0.5 W (in the standby mode) Approx. 145 × 240 × 252 mm
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9-874-072-01
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Sony Corporation
Home Audio Company Published by Sony Engineering Corporation
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COMPACT DISC DECK RECEIVER
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HCD-EP305
TABLE OF CONTENTS
1. SERVICING NOTES······················································ 3
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2. GENERAL ·········································································· 4
3. DISASSEMBLY ································································ 6
3-1. Front Panel Section ...................................................... 6
3-2. MAIN Board ................................................................ 7
3-3. Tape Mechanism Deck (TCM125-2) ........................... 7
3-4. POWER Board, Power Transformer ............................ 8
3-5. DISPLAY Board, HEADPHONE Board ..................... 8
3-6. CD Cabinet Section...................................................... 9
3-7. CD Mechanism Deck (CS-21SC-1280) ....................... 9
3-8. Cassette Lid................................................................ 10
4. MECHANICAL ADJUSTMENTS ····························· 11
TEL 13942296513 QQ 376315150 892498299
5. ELECTR ICAL ADJUSTMENTS ······························11
6. DIAGRAMS······································································ 15
6-1. Circuit Boards Location .............................................15
6-2. Block Diagrams..........................................................16
6-3. Printed Wiring Board MAIN Section........................ 19
6-4. Schematic Diagram MIAN Section (1/2)..................20
6-5. Schematic Diagram MIAN Section (2/2)..................21
6-6. Printed Wiring Board CASSETTE Section............... 22
6-7. Schematic Diagram CASSETTE Section ................. 22
6-8. Printed Wiring Board DISPLAY Section..................23
6-9. Schematic Diagram DISPLAY Section..................... 24
6-10. Printed Wiring Board POWER Section .................... 25
6-11. Schematic Diagram POWER Section .......................26
6-12. IC Pin Function Description ...................................... 29
TEL
7. EXPLODED VIEWS ······················································ 30
7-1. Cabinet Section .......................................................... 30
7-2. Front Panel Section -1................................................ 31
7-3. Front Panel Section -2................................................ 32
7-4. CD Cabinet Section.................................................... 33
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Notes on chip component replacement
0
•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.
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.
The following caution label is located inside the unit.
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8. ELECTRICAL PARTS LIST ······································· 34
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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
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COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
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SECTION 1

SERVICING NOTES

HCD-EP305
NOTES ON HANDLING THE OPTICAL PICK-UP
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BLOCK OR BASE UNIT
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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 pick­up 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
2. Open the lid for CD.
3. Turn on SW600 as following figure.
4. Confirm the laser diode emission while observing the objecting
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and press the CD button.
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.
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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
b.)The wire must be kept away from the top side of Cassette board
HEADPHONE board
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bottom side of heatsink.
at least 30 mm.
MAIN board
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at least 30 mm
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CASSETTE board
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heatsink
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SW600
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HCD-EP305
SECTION 2

GENERAL

This section is extracted from instruction manual.
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Main unit
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)
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ws qs
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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
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qa
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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)
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wf
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qh qf qk
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qj
qg
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Remote control
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HCD-EP305
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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)
TEL 13942296513 QQ 376315150 892498299
PRESET +/– (10, 11)
ql
8 qd
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qs
qa
q;
qf
R – Z
REPEAT (8) SHUFFLE (8) TAPE (12) TIMER ON/OFF (15) TUNER/BAND (10, 11, 13) TUNER MEM/ENTER/PGM
TUNING + (10, 11) TUNING – (10, 11) VOL (volume) +/–
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qk
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(7, 9, 10, 14, 15)
8 qd
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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)
TEL 13942296513 QQ 376315150 892498299
TEL
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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.
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To adjust the clock
Perform from step 2.
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The clock settings are canceled when you disconnect the power cord or if a power failure occurs.
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HCD-EP305
SECTION 3

DISASSEMBLY

The equipment can be removed using the following procedure.
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FRONT PANEL SECTION

TEL 13942296513 QQ 376315150 892498299
Note : Follow the disassembly procedure in the numerical order given.
3-1. Front Panel Section
TEL
MAIN BOARD
TAPE MECHANISM DECK (TCM125-2)
13942296513
CASSETTE LID
POWER BOARD, POWER TRANSFORMER
DISPLAY BOARD, HEADPHONE BOARD
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two screws (+BTP2.6
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×
10)
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CD CABINET SECTION
CD MECHANISM DECK (CS-21SC-1280)
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antenna cover cabine
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two screws (+K3
connector (CN203)
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claw
×
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connector (CN402)
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front panel section
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connector (SW600)
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two screws (+K3
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two screws (+K3
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×
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screw (+BVTP3
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two screws (+BVTP3
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3-2. MAIN Board
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screw (+BTP2.6 × 8)
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MAIN board

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connector (CN302)
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connector (CN101)
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connector (CN301)
HCD-EP305
2
connector (CN204)
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claw
TEL
13942296513
3-3. Tape Mechanism Deck (TCM125-2)
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tape mechanism deck
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connector (CN202)
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two screws (+BVTP3
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×
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10)
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connector (CN201)
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2
two screws (+BTP2.6
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×
6)
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connector (CN701)
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CASSETTE boar
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Open the cassette lid.
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two screws (+BVTP3
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HCD-EP305
3-4. POWER Board, Power Transformer
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screw (+BVTP3
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×
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AC cord holder
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rear cabinet assy
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q;
power pwb mounting bkt
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screw (+BVTP3
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four screws (+BVTP3
TEL
3-5. DISPLAY Board, HEADPHONE Board
13942296513
5
×
10)
×
12)
6
power transformer
HEADPHONE board
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reteiner board
3
screw (+PTPWH2.6
8
Remove four solderings.
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×
10)
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Remove four solderings.
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POWER board
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6
1
screw (+BTP2.6
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seven screws (+BTP2.6
×
×
10)
8)
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DISPLAY board
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3-6. CD Cabinet Section
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CD cabinet section

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two screws (+BTP2.6
×
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HCD-EP305
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TEL 13942296513 QQ 376315150 892498299
3-7. CD Mechanism Deck (CS-21SC-1280)
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7
two spring clamps
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vibration proof rubber (orange)
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vibration proof rubber
(pink)
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four fiber washers
four pulley screws
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two screws (BVTP3
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10)
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CD mechanism deck (CS-21SC-1280)

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two spring clamps
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vibration proof rubber (orange)
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vibration proof rubber (pink)
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Remove the connector.
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CD cover housing
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HCD-EP305
3-8. Cassette Lid
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Push stop/eject key.
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4

cassette lid

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claw
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claw
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SECTION 4

MECHANICAL ADJUSTMENTS

HCD-EP305
SECTION 5

ELECTRICAL ADJUSTMENTS

PRECAUTION
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1. Clean the following parts with a denatured-alcohol-moistened
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2. Demagnetize the record/playback head with a head
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
5. The adjustments should be performed with the rated power
Torque Measurement
Tape Tension Measurement
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swab :
demagnetizer. (Do not bring the head magnetizer close to the erase head.)
parts adjusted.
supply voltage unless otherwise noted.
Mode Torque Meter Meter Reading
FWD CQ-102C (30 – 70 g•cm)
FWD Back Tension
FF CQ-201B (more than 60 g•cm)
REW CQ-201B (more than 60 g•cm)
6
record/playback head pinch roller erase head rubber belts capstan idlers
13942296513
Mode Torque Meter Meter Reading
FWD CQ-403A more than 100 g
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1
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2.95 – 6.86 mN•m
(0.42 – 0.97 oz•inch)
0.15 – 5.39 mN•m
CQ-102C (1.5 – 5.5 g•cm)
(0.021 – 0.076 oz•inch) more than 5.89 mN•m
(more than 0.83 oz•inch) more than 5.89 mN•m
(more than 0.83 oz•inch)
(more than 3.53 oz)
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1. Setting
TAPE DECK SECTION 0 dB=0.775 V
Test tape
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback
2. Turn the adjustment screw and c heck output peaks. If the peaks
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Screw position
PRECAUTION
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MEGA BASS switch : OFF
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment P-4-A063 6.3 kHz, –10 dB Head Azimuth Adjustment
test tape P-4-A063 (6.3 kHz, –10 dB)
set
do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1dB of peak.
L-CH peak
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R-CH peak
Output level
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HEADPHONE board PHONES jack (JK401
within 1dB
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L-CH peak
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R-CH peak
2
level meter
+ –
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within
9
1dB
Screw position
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3. Mode: Playback
test tape P-4-A063 (6.3 kHz, –10 dB)
L-CH
set
R-CH
in phase
4. After the adjustments, apply suitable locking compound to the parts adjusted.
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HEADPHONE board PHONES jack (JK401)
screen pattern
45
°
90
good wrong
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135 °180
°
oscilloscope
V
+
+
°
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11
HCD-EP305
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Tape Speed Adjustment
Setting:
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Function: TAPE
test tape WS-48A (3 kHz, 0 dB)
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.
TEL 13942296513 QQ 376315150 892498299
Specified V alue: 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:
3
set
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32
HEADPHONE board PHONES jack (JK401)
1
3
frequency counte
+ –
CAPSTAN/REE motor (M201)
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Adjustment Location: Record/Playback Head.
0
adjustment screw
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Tape Speed Adjustment
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3
Note: Refer to “3-8. Cassette Lid” (see page 11
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HCD-EP305
TUNER SECTION 0 dB=1 µV
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[AM]
Setting:
Function : TUNER Band switch : AM
AM RF signal
generator
30% amplitude modulation by 400 Hz signal Output level: as low as possible
[FM]
Setting:
Function : TUNER Band switch : FM
FM RF signal
generator
22.5 kHz frequency deviation by 400 Hz signal Output level: as low as possible
6
Put the lead-wire antenna close to the set.
0.01 µF
1
3
set
MAIN board FM ANT
set
5
1
level meter
32
HEADPHONE board PHONES jack (JK401
level meter
32
HEADPHONE board PHONES jack (JK401
digital voltmeter
5
+ –
+ –
0
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation 531 kHz 1.5 ± 0.2 V
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation 108 MHz 7.0 ± 0.4 V
Adjustment Location: MAIN board (See page 14)
AM FREQUENCY COVERAGE ADJUSTMENT
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T102 1,602 kHz 7.3 ± 0.3 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L110 603 kHz
TC102 1,404 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
L104 87.6 MHz 2.1 ± 0.2 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L103 89.9 MHz
TC101 105.9 MHz
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•Repeat the procedures in each adjustment sev eral times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.
MAIN board
13942296513
TP10 (FM VT) TP11 (AM VT)
100 k
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