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US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Chinese Model

Model Name Using Similar Mechanism NEW

CD Mechanism Type

CDM55C-K6BD38

Base Unit Name

BU-K6BD38

Optical Pick-up Name

KSM-213D

• This set is  the Amplifier and CD player

section in CMT-RB5.

System

Compact disc and digital audio
system

Laser

Semiconductor laser (

λ=780 nm)

Emission duration: continuous

Laser output

MAX. 44.6 

µW*

*This output is the value measured
at a distance of 200 mm from the
objective lens surface on the
Optical Pick-up Block with 7 mm
aperture.

Frequency response

2 Hz – 20 kHz

FM stereo, FM/AM superheterodyne tuner

Tuning range
US, Canadian model:

87.5 – 108.0 MHz
(100 kHz step)

Other models:

87.5 – 108.0 MHz
(50 kHz step)

Antenna

FM lead antenna

Antenna terminals

75 ohms unbalanced

Intermediate frequency

10.7 MHz

Tuning range
US, Canadian model:

530 – 1,710 kHz
(with the interval set at 10 kHz)
531 – 1,710 kHz
(with the interval set at 9 kHz)

European model:

531 – 1,602 kHz
(with the interval set at 9 kHz)

Other models:

531 – 1,602 kHz
(with the interval set at 9 kHz)
530 – 1,710 kHz
(with the interval set at 10 kHz)

Antenna

AM loop antenna
External antenna terminals

Intermediate frequency

450 kHz

Power requirements
US, Canadian model:

120 V AC, 60 Hz

European model:

230 V AC, 50/60 Hz

Australian model:

220 – 240 V AC, 50/60 Hz

Korea, Chinese model:

220  V AC, 50/60 Hz

Mexican model:

120 V AC, 60 Hz

Other models:

110 – 120 V or 220 – 240 V AC,
50/60 Hz
Adjustable with voltage selector

Power consumption
US, Canadian and Mexican models:

50 watts

Other models:

45 watts

Dimensions (w/h/d)

Approx. 180 

× 130 × 315 mm

incl. projecting parts and controls

Mass

Approx. 4.0 kg

Supplied accessories

Remote (1)
Size AA (R6) batteries (2)
AM loop antenna (1)
FM lead antenna (1)
Speaker cords (2)

Design and specifications are subject to change
without notice.

POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:

With 4-ohm loads, both channels driven, from
120 – 10,000 Hz; rated 15 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.

Continuous RMS power output (reference):

15 + 15 watts
(4 ohms at 1 kHz, 10% THD)

DIN power output (Rated):12 + 12 watts

(4 ohms at 1 kHz, DIN)

Continuous RMS power output (Reference):

15 + 15 watts
(4 ohms at 1 kHz,
10% THD)

Music power output (Reference):

28 + 28 watts

The following measured at 220 V AC, 50/60 Hz

DIN power output (rated): 10 + 10 watts

(4 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

12 + 12 watts
(4 ohms at 1 kHz, 10% THD)

The following measured at 240 V AC, 50/60 Hz

DIN power output (rated): 12 + 12 watts

(4 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

15 + 15 watts
(4 ohms at 1 kHz, 10% THD)

Inputs
MD/VIDEO (AUDIO) IN (phono jacks):

voltage 500/250 mV, impedance
47 kilohms

Outputs
MD/VIDEO (AUDIO) OUT (phono jack):

voltage 250 mV, impedance
1 kilohm

PHONES (stereo minijack):

accepts headphones of 8 ohms or
more.

SPEAKER:

accepts impedance of 4 to
16 ohms.

CD DIGITAL OUT OPTICAL:

Optical

2003K16-1

© 2003.11

2

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.

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.

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
radiation exposure.

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.

·········································································· 4

································································ 6

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······························· 10

5-1. Waveforms ··································································· 11
5-2. Circuit Boards Location ·············································· 11
5-3.

PRINTED  WIRING BOARD –BD SECTION– ······· 12

5-4.

SCHEMATIC  DIAGRAM –BD SECTION– ············ 13

5-5.

PRINTED  WIRING BOARDS

–MAIN SECTION– ··················································· 14

5-6.

SCHEMATIC  DIAGRAM

–MAIN SECTION(1/2)– ··········································· 15

5-7.

SCHEMATIC  DIAGRAM

–MAIN SECTION(2/2)– ··········································· 16

5-8.

PRINTED  WIRING BOARDS

–POWER SECTION– ················································ 17

5-9.

PRINTED  WIRING BOARD
–PANEL SECTION– ················································· 18

5-10. SCHEMATIC  DIAGRAM

–PANEL SECTION– ················································· 19

5-11. SCHEMATIC  DIAGRAM

–LOADING SECTION– ············································ 20

5-12. PRINTED  WIRING BOARDS

–LOADING SECTION– ············································ 20

5-13. IC Pin Function ·························································· 20
5-14. IC Block Diagrams ····················································· 22

................................................... 23

................................... 28

Unleaded solder
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur
such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

3

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.

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.

    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.

    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)

µ

Ω

Power Voltage

Incdication

AC: 120 V 60 Hz 50 W

AC: 230 V 50 Hz 45 W

AC: 220 – 240V 50/60 Hz 45 W

AC: 110 – 120/

220 – 240 V 50/60 Hz 45 W

AC: 220 V – 60 Hz 45 W

Model

US, CND, MX models

AEP, UK, AED, EE models

AUS, CIS, CH, models

E, AR, HK, MY,

SP, TW models

KR

• Abbreviation

CND : Canadian model.

AUS

: Australian model.

SP

: Singapore model.

MY

: Malaysia model.

AR

: Argentine model.

AED

: North European model.

MX

: Mexican model.

KR

: Korean model.

EE

: East European model. HK

: Hong Kong model.

TW

: Taiwan model.

CH

: Chinese model.

Power Voltage 
Indication

4

qa

1

2

qs

3

q;

4

9

5

8

6

7

1

?/1 button

2

DISPLAY button

3

TUNER/BAND button

4

7 button

5

FUNCTION button

6

Z button

7

VOLUME knob

8

J L button

9

s button

q;

l j button

qa

PHONE jack

qs

t indicator