Sony CMT-EP50 / HCD-EP50 Service Manual ▷ View online
2
HCD-EP50
TABLE OF CONTENTS
1.
SERVICING NOTES
................................................
4
2.
GENERAL
...................................................................
5
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
7
3-2. Front Panel Section .........................................................
8
3-3. MAIN Board ...................................................................
8
3-4. CD Cabinet Section .........................................................
9
3-5. CD Mechanism Deck (CS-21SC-1280) .........................
9
3-6. Tape Mechanism Deck (CRL3439) ................................ 10
3-7. Cassette Lid ..................................................................... 10
3-7. Cassette Lid ..................................................................... 10
4.
MECHANICAL ADJUSTMENTS
....................... 11
5.
ELECTRICAL ADJUSTMENTS
......................... 11
6.
DIAGRAMS
6-1. Block Diagram – TUNER Section – ............................. 15
6-2. Block Diagram – TAPE DECK Section – ..................... 16
6-3. Block Diagram – MAIN Section – ................................ 17
6-4. Block Diagram
6-2. Block Diagram – TAPE DECK Section – ..................... 16
6-3. Block Diagram – MAIN Section – ................................ 17
6-4. Block Diagram
– DISPLAY/POWER SUPPLY Section – ...................... 18
6-5. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 19
6-6. Schematic Diagram – FM TUNER Section – ............... 19
6-7. Schematic Diagram – MAIN Board (1/3) – .................. 20
6-8. Schematic Diagram – MAIN Board (2/3) – .................. 21
6-9. Schematic Diagram
6-7. Schematic Diagram – MAIN Board (1/3) – .................. 20
6-8. Schematic Diagram – MAIN Board (2/3) – .................. 21
6-9. Schematic Diagram
– MAIN (3/3)/HEADPHONE Boards – ......................... 22
6-10. Printed Wiring Boards
– MAIN/HEADPHONE Boards – .................................. 23
6-11. Printed Wiring Board – DISPLAY Board – .................. 24
6-12. Schematic Diagram – DISPLAY Board – ..................... 25
6-13. Printed Wiring Board – POWER Board – ..................... 26
6-14. Schematic Diagram – POWER Board – ........................ 27
6-15. IC Pin Function Description ........................................... 31
6-12. Schematic Diagram – DISPLAY Board – ..................... 25
6-13. Printed Wiring Board – POWER Board – ..................... 26
6-14. Schematic Diagram – POWER Board – ........................ 27
6-15. IC Pin Function Description ........................................... 31
7.
EXPLODED VIEWS
7-1. Cabinet Section ............................................................... 33
7-2. Front Panel Section-1 ...................................................... 34
7-3. Front Panel Section-2 ...................................................... 35
7-4. CD Cabinet Section ......................................................... 36
7-2. Front Panel Section-1 ...................................................... 34
7-3. Front Panel Section-2 ...................................................... 35
7-4. CD Cabinet Section ......................................................... 36
8.
ELECTRICAL PARTS LIST
............................... 37
3
HCD-EP50
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing 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 ra-
diation exposure.
other than those specified herein may result in hazardous ra-
diation exposure.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check 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.
ing safety check 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
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 manufacturers’ instructions to use these
instruments.
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 voltmeter. The “limit” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
Ω
0.15
µ
F
AC
voltmeter
(0.75 V)
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE
0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
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 PUB-
LISHED BY SONY.
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
The following caution label is located inside the unit.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
Ver 1.1
4
HCD-EP50
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 electro-
static 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.
static 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 emis-
sion, observe from more than 30 cm away from the objective lens.
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
CHECK
1. Press the
I/1
button to the power ON with no disc inserted
and press the
[CD]
button.
2. Open the lid for CD.
3. Turn on SW300 as following figure.
4. Confirm the laser diode emission while observing the object-
3. Turn on SW300 as following figure.
4. Confirm the laser diode emission while observing the object-
ing lens. When there is no emission, Auto Power Control cir-
cuit or Optical Pick-up is broken.
Objective lens moves up and down five times for the focus
search.
cuit or Optical Pick-up is broken.
Objective lens moves up and down five times for the focus
search.
SECTION 1
SERVICING NOTES
• MODEL IDENTIFICATION
– Bottom View –
– Bottom View –
MODEL
PART No.
AEP and UK models
4-235-177-0
[]
US and Canadian models
4-235-179-0
[]
Singapore and Hong Kong models
4-235-180-0
[]
Mexican model
4-235-182-0
[]
Argentina model
4-235-183-0
[]
Chinese model
4-238-634-0
[]
SW300
PART No.
Ver 1.1
5
HCD-EP50
Cassette compartment qj (13)
CD 4 (8, 9, 14)
DISPLAY wf (9, 11)
Display Window 5 (8, 9, 10)
ENTER ql (7, 9, 10, 12)
ISS 0 (14)
MEGA BASS 8 (16)
MONO STEREO 0 (11)
MUSIC MENU 9 (16)
PHONES jack wa
PLAY MODE w; (8, 9)
PRESET +/— qk (10, 11, 12)
CD 4 (8, 9, 14)
DISPLAY wf (9, 11)
Display Window 5 (8, 9, 10)
ENTER ql (7, 9, 10, 12)
ISS 0 (14)
MEGA BASS 8 (16)
MONO STEREO 0 (11)
MUSIC MENU 9 (16)
PHONES jack wa
PLAY MODE w; (8, 9)
PRESET +/— qk (10, 11, 12)
RDS (European model only)/DIR
w; (12, 13, 14, 15)
Remote sensor wg
TAPE 3 (13)
TIMER indicator 2 (15, 18)
TUNER 6 (10, 11, 14)
TUNER MEM ql (10)
TUNING + qf (10, 11, 12, 15)
TUNING — qg (10, 11, 12, 15)
VOLUME control qd
TAPE 3 (13)
TIMER indicator 2 (15, 18)
TUNER 6 (10, 11, 14)
TUNER MEM ql (10)
TUNING + qf (10, 11, 12, 15)
TUNING — qg (10, 11, 12, 15)
VOLUME control qd
1
2
3 4 5 6
7
8
9
q;
qh
qg
qf
qd
qs
qa
qk
ql
w;
wa
ws
wg
wf
wd
qj
BUTTON DESCRIPTIONS
@/1 (power) 1 (7, 11, 15, 18)
CD
. m (go back) qg (8, 9)
M > (go forward) qf (8, 9)
nN (play) qa (8, 9)
X (pause) wd (8)
Z PUSH OPEN/CLOSE 7 (8)
x (stop) qs (8, 9)
M > (go forward) qf (8, 9)
nN (play) qa (8, 9)
X (pause) wd (8)
Z PUSH OPEN/CLOSE 7 (8)
x (stop) qs (8, 9)
TAPE
M > (fast forward) qf (13)
X (pause) wd (13)
nN (play) qa (13, 14, 15)
z (recording) ws (14, 15)
. m (rewind) qg (13)
Z PUSH OPEN/CLOSE qh (13)
x (stop) qs (13, 14)
X (pause) wd (13)
nN (play) qa (13, 14, 15)
z (recording) ws (14, 15)
. m (rewind) qg (13)
Z PUSH OPEN/CLOSE qh (13)
x (stop) qs (13, 14)
SECTION 2
GENERAL
This section is extracted from
instruction manual.
instruction manual.
LOCATION OF CONTROLS
– Front Panel –
– Front Panel –