CMT-EP50LIV, HCD-EP50LIV - Sony Audio Service Manual (repair manual)

Model
CMT-EP50LIV HCD-EP50LIV
Pages
45
Size
2.58 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-ep50liv-hcd-ep50liv.pdf
Date

View Sony CMT-EP50LIV / HCD-EP50LIV Service Manual online

SERVICE MANUAL
MICRO Hi-Fi COMPONENT SYSTEM
US Model
HCD-EP50LIV
Ver 1.0  2002.02
HCD-EP50LIV is the amplifier, CD player, tape
deck and tuner section in CMT-EP50LIV.
9-873-634-01
Sony Corporation
2002B0500-1
Home Audio Company
C
 2002.02
Published by Sony Engineering Corporation
SPECIFICATIONS
CD
Model Name Using Similar Mechanism
HCD-EP50
Section
CD Mechanism Type
CS-21SC-1280
TAPE
Model Name Using Similar Mechanism
NEW
Section
Tape Transport Mechanism Type
CRL3439
AUDIO POWER SPECIFICATIONS:
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
with 8 
 loads both channels driven, from 120
- 10,000 Hz; rates 12 W per channel minimum
RMS power, with no more than 10% total
harmonic distortion from 250 mW to rated
output.
Amplifier section
The following measured at AC 230 V, 50/60 Hz
DIN power output (rated) 11 + 11 W
(8 
 at 1 kHz, DIN)
Continuous RMS power output (reference)
12 + 12 W
(8 
 at 1 kHz, 10% THD)
Outputs
PHONES:
Accepts headphones of
(stereo mini jack)
 or more
SPEAKER:
Accepts impedance of 8 to
16 
Tape player section
Recording system
4-track 2-channel stereo
Frequency response
50 - 13 000 Hz (
±
3 dB),
using Sony TYPE I
cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range                       87.5 - 108.0 MHz
Antenna
FM lead antenna
Antenna terminal
75 
 coaxial
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
530 - 1 710 kHz
(with the interval set at
10 kHz)
531 - 1 710 kHz
(with the interval set at
9 kHz)
Antenna
AM loop antenna
Antenna terminal
External antenna terminal
Intermediate frequency
450 kHz
General
Power requirements:
120 V AC, 60 Hz
Power consumption:
35 W
Dimensions (w/h/d):
Approx. 145 
×
 238 
×
 234 mm
Mass:
Approx. 3.4 kg
Supplied accessories:
AM loop antenna (1)
Remote Commander (1)
Batteries (2)
FM lead antenna (1)
Design and specifications are subject to change
CD player section
System
Compact disc and digital
audio system
Laser
Semiconductor laser
(
λ
=780 nm)
Emission duration:
continuous
Frequency response
20 Hz - 20 kHz (
±
0.5 dB)
2
HCD-EP50LIV
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
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-EP50LIV
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.
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
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.
4
HCD-EP50LIV
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
SW300

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Here you can view online and download Sony CMT-EP50LIV / HCD-EP50LIV Service Manual in PDF. CMT-EP50LIV / HCD-EP50LIV service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony CMT-EP50LIV / HCD-EP50LIV Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.