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COMPONENT MODEL NAME FOR CMT-ED2/ED2U
CMT-ED2/ED2U
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
SERVICE MANUAL
MICROFILM
General
Power requirements
North American model: 120 V AC, 60 Hz
European model:
230 V AC, 50/60 Hz
Other models:
110 - 120 V or 220 - 240 V AC, 50/60 Hz
Adjustable with voltage selector
Power consumption
55W
ACCESSORIES & PACKING MATERIALS
*******************************
1-418-635-11 COMMANDER, STANDARD (RM-SED2)
!
1-569-008-11 ADAPTER, CONVERSION (2P) (MY,SP,KR)
1-791-962-11 ANTENNA (FM) (EXCEPT US,CND)
1-792-027-11 ANTENNA (FM) (US,CND)
3-867-342-11 MANUAL, INSTRUCTION (ENGLISH)
3-867-342-21 MANUAL, INSTRUCTION (FRENCH,SPANISH)
(US,CND,AEP,MY,SP,KR)
3-867-342-31 MANUAL, INSTRUCTION (ITALIAN,PORTUGUESE)
(AEP)
3-867-342-41 MANUAL, INSTRUCTION (GERMAN,DUTCH) (AEP)
3-867-342-51 MANUAL, INSTRUCTION (SWEDISH,FINNISH,
DANISH) (AEP)
3-867-342-61 MANUAL, INSTRUCTION (CHINESE) (TW,HK)
3-867-342-71 MANUAL, INSTRUCTION (POLISH,RUSSIAN) (AEP)
4-993-348-01 COVER, BATTERY (FOR RM-SED2)
X-4952-476-1 GRILLE FRAME ASSY (YELLOW) (AEP)
X-4949-451-1 AM ANT SUB ASSY
X-4952-593-1 GRILLE FRAME ASSY (GRAY) (US,CND)
PARTS LIST
Sony Corporation
Home Audio Company
MICRO HiFi COMPONENT SYSTEM
99H001688-1
Printed in Japan ©1999.8
Published by Quality Assurance Dept.
· CMT-ED2/ED2U is composed of following models.
As for the service manual, it is issued for each component
model, then, please refer to it.
·Abbreviation
CND : Canadian model
MY : Malaysia model
SP
: Singapore model
HK : Hong Kong model
AUS : Australian model
KR : Korea model
TW : Taiwan model
Supplied accessories
Remote Commander (1)
AM bar antenna (1)
FM wire antenna (1)
Batteries (2)
Speaker grilles (2)
Screws (For attaching the speakers) (4)
Design and specifications are subject to change without notice.
Ref. No. Part No.
Description
Remark
SPECIFICATIONS
The components identified by
mark
! or dotted line with mark
! are critical for safety.
Replace only with part number
specified.
Les composants identifiés par une
marque
! sont critiques pour la
sécurité.
Ne les remplacer que par une
piéce portant le numéro spécifié.
COMPACT DISC DECK RECEIVER SYSTEM
SPEAKER SYSTEM
EXCEPT US, CND
US, CND
HCD-ED2
SS-CED2
SS-CED2U
9-929-021-11
(SP)


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1
HCD-ED2
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
SPECIFICATIONS
COMPACT DISC DECK RECEIVER
-- Continued on next page --
Model Name Using Similar Mechanism NEW
Mechanism Type
CDM-61
Base Unit Type
KSM-331AAN/K1NP
Optical Pick-up Type
KSS-331A (RP)
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type
CMAL1Z025A
CD
SECTION
TAPE DECK
SECTION
MICROFILM
SERVICE MANUAL
HCD-ED2 is the tuner, deck, CD and
amplifier section in CMT-ED2.


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2
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK
! OR DOTTED LINE
WITH MARK
! 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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation 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.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER PROD-
UCT MARKING is located on
the rear exterior.
This caution
label is located
inside the unit.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE
!SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS
SONT DONNÉS DANS CE MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.


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3
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, ob-
serve from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the "S curve check" in "CD section adjustment" and check
that the S curve waveform is output several times.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing 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 microampers). Leak-
age 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 pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
0.15
µF
To Exposed Metal
Parts on Set
1.5k
AC
voltmeter
(0.75V)
Earth Ground
1. SERVICING NOTE .......................................................... 4
2. GENERAL .......................................................................... 5
3. DISASSEMBLY
3-1. CD Base and Base Unit .......................................................... 7
3-2. Rear Panel ............................................................................. 7
3-3. Bottom Cover and Front Panel Block ................................... 8
3-4. Door Cover assy and Mechanical Deck (Cassette) ............... 8
4. MECHANICAL ADJUSTMENTS ................................ 9
5. ELECTRICAL ADJUSTMENTS ................................. 9
6. DIAGRAMS
6-1. Circuit Boards Location ...................................................... 13
6-2. Schematic Diagram ­ BD Section ­ ................................... 14
6-3. Printed Wiring Board ­ BD Section ­ ................................. 15
6-4. Schematic Diagram ­ Function Section ­ ........................... 16
6-5. Printed Wiring Board ­ Function Section ­ ........................ 17
6-6. Schematic Diagram ­ Tape Preamp Section ­ .................... 18
6-7. Printed Wiring Board ­ Tape Preamp Section ­ ................. 19
6-8. Schematic Diagram ­ Display Section ­ ............................. 20
6-9. Printed Wiring Board ­ Display Section ­ .......................... 21
6-10. Schematic Diagram ­ Relay Section ­ ............................. 22
6-11. Printed Wiring Board ­ Relay Section ­ .......................... 23
6-12. Schematic Diagram ­ Power Section ­ ............................ 24
6-13. Printed Wiring Board ­ Power Section ­ ......................... 25
6-14. Schematic Diagram ­ RDS Section ­ ............................... 26
6-15. Printed Wiring Board ­ RDS Section ­ ............................ 27
6-16. IC Block Diagrams ........................................................... 28
6-17. IC Pin Functions ............................................................... 30
7. EXPLODED VIEWS
7-1. CD Section .......................................................................... 33
7-2. Rear Panel Section .............................................................. 34
7-3. Front Panel Section ............................................................. 35
7-4. Mechanism Deck Section (Cassette) .................................. 36
7-5. Base Unit Section ................................................................ 37
8. ELECTRICAL PARTS LIST ........................................ 38
TABLE OF CONTENTS


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W703-1
W703-2
Touch sensor
The hinge may be damaged.
M703-2
M703-1
Relay board
Relay board
Tape preamp board
Extension cable (23pin)(25cmm)
Extension cable (23pin)(25cmm)
(CMT-ED2, J-2501-179-A)
J-2501-179-A
Tape preamp board
CMT
-ED2
SECTION 1
SERVICING NOTE
Connectiong the extension cable (CMT-ED2)
CD LID
The CD lid of this unit is opened and closed electrically.
Opening or closing the CD lid with force when the power plug is
not connected to the outlet or the power is OFF may damage the
hinge.
When servicing the unit, open and close the lid by touch the
§
button. (metal side)
The lid does not move even if the
§ is touched.
Touch the metal part of the front panel.