Sony CMT-EP305 / HCD-EP305 Service Manual ▷ View online
HCD-EP305
AEP Model
SERVICE MANUAL
COMPACT DISC DECK RECEIVER
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-874-072-01
2002E1600-1
© 2002.05
HCD-EP305 is the amplifler, CD
player, tape deck and tuner section in
CMT-EP305.
player, tape deck and tuner section in
CMT-EP305.
SPECIFICATIONS
Ver 1.0 2002. 05
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
Amplifier section
DIN power output (rated) 4.5 + 4.5 W
(4
Ω at 1 kHz, DIN)
Continuous RMS power output (reference)
6 + 6 W
(4
(4
Ω at 1 kHz, 10% THD)
Music power output (reference)
13 + 13 W
Outputs
PHONES:
PHONES:
Accepts headphones of
(stereo mini jack)
8
Ω or more
SPEAKER:
Accepts impedance of 4 to
16
16
Ω
CD player section
System
System
Compact disc and digital
audio system
audio system
Laser
Semiconductor laser
(
(
λ=780 nm)
Emission duration:
continuous
continuous
Frequency response
20 Hz - 20 kHz (
±0.5 dB)
Tape player section
Recording system
Recording system
4-track 2-channel stereo
Frequency response
50 - 13 000 Hz (
±3 dB),
using Sony TYPE I
cassette
cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
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
531 -1 602 kHz
(with the interval set at
9 kHz)
(with the interval set at
9 kHz)
Antenna
Built-in ferrite bar antenna
Intermediate frequency
450 kHz
General
Power requirements
Power requirements
230 V AC, 50/60 Hz
Power consumption
30 W
0.5 W (in the standby
mode)
0.5 W (in the standby
mode)
Dimensions (w/h/d):
Approx. 145
× 240 × 252 mm
Mass:
Approx. 2.9 kg
Design and specifications are subject to change
without notice.
without notice.
2
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
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.
other than those specified herein may result in hazardous radiation
exposure.
HCD-EP305
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.
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
• 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.
TABLE OF CONTENTS
1. SERVICING NOTES
······················································ 3
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
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
6-11. Schematic Diagram POWER Section ....................... 26
6-12. IC Pin Function Description ...................................... 29
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
8. ELECTRICAL PARTS LIST
······································· 34
3
HCD-EP305
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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.
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.
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
CHECK
1.
Press the ?/1 button to the power ON with no disc inserted
and press the CD button.
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.
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
CASSETTE board
MAIN board
HEADPHONE
board
board
at least 30 mm
heatsink
TO PREVENT ‘TAPE OSCILLATION SOUND AT VOLUME’
MAXIMUM SETTING (W/O TAPE)
MAXIMUM SETTING (W/O TAPE)
Headphone wire dressing:
a.) Draw the wire from Main board to Headphone board along the
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
at least 30 mm.
4
HCD-EP305
SECTION 2
GENERAL
This section is extracted
from instruction manual.
from instruction manual.
Main unit
R – Z
Remote sensor q;
REPEAT
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
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 +/–
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
