CMT-L1, HCD-L1 - Sony Audio Service Manual (repair manual)

Model
CMT-L1 HCD-L1
Pages
68
Size
11.88 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-l1-hcd-l1.pdf
Date

View Sony CMT-L1 / HCD-L1 Service Manual online

HCD-L1
US Model
Canadian Model
AEP Model
UK Model
E Model
SERVICE MANUAL
MICRO Hi-Fi COMPONENT SYSTEM
Sony Corporation
Published by Sony Techno Create Corporation
9-873-561-02
2011A05-1
© 2011.01
Ver. 1.1  2011. 01
SPECIFICATIONS
This set is the tuner, CD and amplifier
section in CMT-L1.
Model Name Using Similar Mechanism
NEW
CD Mechanism Type
CDM71A
Base Unit Type
BU-31BD63A
CD
SECTION
— Continued on next page —
Main unit (HCD-L1)
Amplifier section
For the U.S. model
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
With 4-ohm loads, both channels driven, from
120 - 10,000 Hz; rated 25 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.
North American model:
Continuous RMS power output (reference):
25 + 25 W
(4 ohms at 1 kHz, 10%
THD)
European model:
DIN power output (rated): 20 + 20 W
(4 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
25 + 25 W
(4 ohms at 1 kHz, 10%
THD)
Music power output (reference):
25 + 25 W
Other models:
The following measured at 220 V AC, 60 Hz
DIN power output (rated): 20 + 20 W
(4 ohms at 1 kHz, DIN,
110 V - 240 V AC)
Continuous RMS power output (reference):
25 + 25 W
(4 ohms at 1 kHz, 10%
THD, 110 V - 240 V AC)
Inputs
MD/TAPE IN (stereo minijack):
Sensitivity 450 mV (MD)/
250 mV (Tape),
impedance 47 kilohms
Outputs
MD/TAPE OUT (stereo minijack):
Sensitivity 250 mV,
impedance 1 kilohmes
PHONES (stereo minijack):
Accepts headphones with
an impedance of  8 ohms
or more
DIGITAL CD OPTICAL OUT (Supported sampling
frequency: 44.1 kHz)
CD player section
System
Compact disc and digital
audio system
Laser
Semiconductor laser
(
λ = 795 nm)
Emission
duration: continuous
Frequency response
2 Hz – 20 kHz
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
North American model:
87.5 - 108.0 MHz
(100-kHz step)
Other models:
87.5 - 108.0 MHz
(50-kHz step)
Antenna
FM wire antenna
Antenna terminals
75 ohm unbalanced
Intermediate frequency
10.7 MHz
 
 
            
2
HCD-L1
       After correcting the original service problem, perform the
following safety checks 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
    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” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
SAFETY  CHECK-OUT
To Exposed Metal 
Parts on Set
0.15 
µ
F
1.5 k
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A.  Using an AC voltmeter to check AC leakage.
General
Power requirements
North American model:
120 V AC, 60 Hz
European  model:
230 V AC, 50/60 Hz
Other models:
110 - 240 V AC ,
50/60 Hz
Power consumption
European model:
See the nameplate
0.2 W (at the Power
Saving Mode)
Other models:
See the nameplate
Dimensions (w/h/d)
Approx. 293 
× 246 ×
131 mm incl. projecting
parts and controls
Mass
Approx. 3.5 kg
Design and specifications are subject to change
without notice.
AM tuner section
Tuning range
North American model:
530 - 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 - 1,710 kHz
(with the tuning interval
set at 9 kHz)
European model:
531 - 1,602 kHz
(with the tuning interval
set at 9 kHz)
Other models:
530 - 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 - 1,602 kHz
(with the tuning interval
set at 9 kHz)
Antenna
AM loop antenna, external
antenna terminal
Intermediate frequency
450 kHz
3
HCD-L1
TABLE OF CONTENTS
1. SERVICING NOTES
······················································· 4
2. GENERAL
·········································································· 5
3. DISASSEMBLY
3-1.
Bottom Plate,Case ························································ 9
3-2.
Front Panel Section ······················································ 9
3-3.
POWER Board, AM/FM Tuner ·································· 10
3-4.
MAIN Board ······························································ 10
3-5.
AMP Board, Regurator ·············································· 11
3-6.
Door Panel, LED Board (R), Indicator ······················ 11
3-7.
LED Board (L) ··························································· 12
3-8.
FL (L1) Board ···························································· 12
3-9.
SWITCH Board, TOUCH SWITCH Board ··············· 13
3-10. CD Board ··································································· 13
3-11. CD-mechanism (CDM71A) ······································· 14
3-12. L.MOTOR Board ······················································· 14
3-13. ENCODER Board, D.sensor Board ··························· 15
3-14. RTL Pulley Assy ························································ 15
3-15. BD Board ··································································· 16
3-16. C.MOTOR Board, L.SENSOR Board ······················· 16
3-17. Base Unit ···································································· 17
3-18. Holder Assy, Sled Motor Assy ··································· 17
3-19. RTR Pulley Assy ························································ 18
3-20. SPT Pulley Assy ························································· 18
4. TEST MODE
···································································· 19
5. ELECTRICAL ADJUSTMENTS
······························· 22
6. DIAGRAMS
6-1.
Block Diagrams  CD Section ····································· 23
MAIN Section ···························································· 24
6-2.
Circuit Boards Location ············································· 25
6-3.
Printed Wiring Board  BD Section (Side A) ·············· 26
6-4.
Printed Wiring Board  BD Section (Side B) ·············· 27
6-5.
Schematic Diagram  BD Section ······························· 28
6-6.
Schematic Diagram  CD Section ······························· 29
6-7.
Printed Wiring Board  CD Section (Side A) ·············· 30
6-8.
Printed Wiring Board  CD Section (Side B) ·············· 31
6-9.
Printed Wiring Board  MOTOR Section ···················· 32
6-10. Schematic Diagram  MOTOR Section ······················· 33
6-11. Printed Wiring Board  MAIN Section (Side A) ········· 34
6-12. Printed Wiring Board  MAIN Section (Side B) ········· 35
6-13. Schematic Diagram  MAIN Section (1/2) ·················· 36
6-14. Schematic Diagram  MAIN Section (2/2) ·················· 37
6-15. Printed Wiring Board  AMP Section (Side A) ··········· 38
6-16. Printed Wiring Board  AMP Section (Side B) ··········· 39
6-17. Schematic Diagram  AMP Section ····························· 40
6-18. IC Block Diagrams ····················································· 41
6-19. Printed Wiring Board  DISPLAY Section ·················· 42
6-20. Schematic Diagram  DISPLAY Section ····················· 43
6-21. Printed Wiring Board  SWTICH Section ··················· 44
6-22. Schematic Diagram  SWTICH Section ······················ 45
6-23. Printed Wiring Board  POWER Section ···················· 46
6-24. Schematic Diagram  POWER Section ······················· 47
6-25. IC PIN FUNCTION DESCRIPTION ························ 48
7. EXPLODED VIEWS
7-1.
Case Section ······························································· 51
7-2.
Chassis Section ·························································· 52
7-3.
Front Panel Section ···················································· 53
7-4.
Mechanism Section(CDM71A)-1 ······························ 54
7-5.
Mechanism Section(CDM71A)-2 ······························ 55
7-6.
Base Unit Section (BU-31BD63A) ···························· 56
8. ELECTRICAL PARTS LIST
······································· 57
4
HCD-L1
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.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
Notes on chip component replacement
• 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.
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
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.
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.
SECTION 1
SERVICING NOTES
This caution
label is
located inside
the unit.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 
0
 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

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