DOWNLOAD Sony CMT-EP50 / HCD-EP50 Service Manual ↓ Size: 2.75 MB | Pages: 47 in PDF or view online for FREE

Model
CMT-EP50 HCD-EP50
Pages
47
Size
2.75 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-ep50-hcd-ep50.pdf
Date

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
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
– 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
– 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
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
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-
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.
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.
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 manufacturers’ 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 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)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15 
µ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
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.
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.
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.
Ver 1.1
4
HCD-EP50
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
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.
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.
LASER DIODE AND FOCUS SEARCH OPERATION
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-
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.
SECTION  1
SERVICING  NOTES
• MODEL  IDENTIFICATION
– 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)
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
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)
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)
SECTION  2
GENERAL
This section is extracted from
instruction manual.
LOCATION OF CONTROLS
– Front Panel –
Page of 47
Display

Sony CMT-EP50 / HCD-EP50 Service Manual ▷ Download

  • DOWNLOAD Sony CMT-EP50 / HCD-EP50 Service Manual ↓ Size: 2.75 MB | Pages: 47 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony CMT-EP50 / HCD-EP50 in PDF for free, which will help you to disassemble, recover, fix and repair Sony CMT-EP50 / HCD-EP50 Audio. Information contained in Sony CMT-EP50 / HCD-EP50 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.