HCD-EP305 is the amplifler, CD
player , tape deck and tuner section in
CMT-EP305.
CD
SECTION
TAPE DECK
SECTION
4
2
9
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Model Name Using Similar MechanismHCD-EP30/EP40
CD Mechanism TypeCS-21SC-1280
Model Name Using Similar MechanismHCD-EP30/EP40
Tape T ransport Mechanism TypeTCM125-2
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AEP Model
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TEL 13942296513 QQ 376315150 892498299
TEL
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 Ω or more
SPEAKER:Accepts impedance of 4 to
CD player section
SystemCompact disc and digital
LaserSemiconductor laser
7-2. Front Panel Section -1................................................ 31
7-3. Front Panel Section -2................................................ 32
7-4. CD Cabinet Section.................................................... 33
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13942296513
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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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TEL 13942296513 QQ 376315150 892498299
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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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2
SECTION 1
SERVICING NOTES
HCD-EP305
NOTES ON HANDLING THE OPTICAL PICK-UP
Q
TEL 13942296513 QQ 376315150 892498299
BLOCK OR BASE UNIT
Q
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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3
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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1
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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
b.)The wire must be kept away from the top side of Cassette board
HEADPHONE
board
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2
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bottom side of heatsink.
at least 30 mm.
MAIN board
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at least 30 mm
2
CASSETTE board
9
heatsink
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TEL 13942296513 QQ 376315150 892498299
TEL
13942296513
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)
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
L-CH
peak
0
5
1
5
1
3
6
R-CH
peak
Output
level
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HEADPHONE board
PHONES jack (JK401
within
1dB
2
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8
L-CH
peak
8
Ω
4
R-CH
peak
2
level meter
+
–
2
8
9
9
within
9
1dB
Screw
position
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TEL 13942296513 QQ 376315150 892498299
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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
goodwrong
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Ω
Ω
135 °180
°
oscilloscope
V
+
+
–
–
°
H
11
HCD-EP305
r
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Tape Speed Adjustment
Setting:
Q
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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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HEADPHONE board
PHONES jack (JK401)
1
3
frequency counte
Ω
+
–
CAPSTAN/REE
motor (M201)
5
1
5
Adjustment Location: Record/Playback Head.
0
adjustment screw
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TEL 13942296513 QQ 376315150 892498299
Tape Speed
Adjustment
TEL
13942296513
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Note: Refer to “3-8. Cassette Lid” (see page 11
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HCD-EP305
TUNER SECTION0 dB=1 µV
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TEL 13942296513 QQ 376315150 892498299
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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
Ω
HEADPHONE board
PHONES jack (JK401
level meter
32
Ω
HEADPHONE board
PHONES jack (JK401
digital voltmeter
5
+
–
+
–
0
Adjustment PartFrequency Display Reading on Digital Voltmeter
Confirmation531 kHz1.5 ± 0.2 V
Adjustment PartFrequency Display Reading on Digital Voltmeter
Confirmation108 MHz7.0 ± 0.4 V
Adjustment Location: MAIN board (See page 14)
AM FREQUENCY COVERAGE ADJUSTMENT
4
2
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T1021,602 kHz7.3 ± 0.3 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L110603 kHz
TC1021,404 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
L10487.6 MHz2.1 ± 0.2 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L10389.9 MHz
TC101105.9 MHz
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TEL 13942296513 QQ 376315150 892498299
TEL
•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
Ω
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