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US Model

Canadian Model

HCD-RX55

E Model

HCD-GRX3/R300

Australian Model

HCD-GRX3

HCD-GRX3/RX55/R300 are the tuner, deck,
CD and amplifier section in MHC-GRX3/
RX55/R300.

Model Name Using Similar Mechanism

HCD-G101

CD Mechanism Type

CX3

Base Unit Type

KSM-213BCM

Optical Pick-up Type

KSS-213B/S-N

Model Name Using Similar Mechanism

NEW

CWB44RR10

CD

SECTION

TAPE DECK

SECTION

Tape Transpor Mechanism Type

2001K1600-1

© 2001.11

AUDIO POWER SPECIFICATIONS:
(U.S.A. model only)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
with 6 

Ω

 loads both channels driven, from 70 – 20,000 Hz; rated 35 W per

channel minimum RMS power, with no more than 0.9% total harmonic
distortion from 250 mW to rated output.

Continuous RMS power output

50 W + 50 W (6 

Ω

 at 1 kHz, 10% THD)

The following measured at AC 110, 220 V 60 Hz;
DIN power output (Rated) 35 W + 35 W (6 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

45 W + 45W (6 

Ω

 at 1 kHz, 10% THD)

The following measured at AC 120, 240 V 60 Hz;
DIN power output (Rated) 40 W + 40 W (6 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

50 W + 50W (6 

Ω

 at 1 kHz, 10% THD)

Peak music power output (Reference)

600 W

Inputs

MD IN (phone jacks) : voltage 450 mV, impedance 47 k

Ω

Outputs

MD OUT (phone jacks) :

voltage 250 mV, impedance 1 k

Ω

PHONES (stereo phone jack) :

accepts headphones of 8 

Ω

 or more

SPEAKER :

accepts impedance of 6 to 16 

Ω

CD player section
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

20 Hz – 20 kHz (± 0.5 dB)

Wavelength

780 – 790 nm

DIGITAL OUT (OPTICAL)
(Square optical connector jack, rear panel)

Wavelength

600 nm

Output Level

–18 dBm

Tape deck section
Recording system

4 -track 2 -channel stereo

Frequency response

40 – 13,000 Hz (± 3dB), using Sony
TYPE 

Ι

 cassette

photo : HCD-GRX3

— Continued on next page —

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be

 damaged by heat.

• 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
PRODUCT MARKING is
located on the rear exterior.

This caution
label is located
inside the 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.

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.

!

!

Antenna terminals

75 

Ω

 unbalanced

Intermediate frequency

10.7MHz

Tuning range

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

Antenna

AM loop antenna

Antenna terminals

External antenna terminal

Intermediate frequency

450 kHz

Power requirements

North American model:120 V AC, 60 Hz
Mexican model:

120 V AC, 50/60 Hz

Australian and South African models:

220 – 240 V AC, 50/60 Hz

Other models:

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

Power consumption

100 W

Dimensions (w/h/d) incl. projecting parts and controls

Approx. 280 

×

 320 

×

 400 mm

(11 

1

/

8

 

×

 12 

5

/

8

 

×

 15 

3

/

4

 in)

Mass

Approx. 9.5 kg (20 lb 15 oz.)

Supplied accessories:

AM loop antenna (1)
Remote (1)
   RM-SG7 (for HCD-GRX3/RX55)
   RM-SG7B (for HCD-R300)
FM lead antenna (1)

Design  and specifications are subject to change without notice.

!

— 2 —

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 microampers).
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)

To Exposed Metal 

Parts on Set

0.15 

µ

F

1.5 k

Ω

AC
Voltmeter
(0.75 V)

Earth Ground

Fig. A.  Using an AC voltmeter to check AC leakage.

.......................................................................... 4

2-1.

Upper Cover and CD Door ................................................. 5

2-2.

Front Panel ......................................................................... 5

2-3.

Main Board ......................................................................... 6

2-4.

Amp Board ......................................................................... 6

2-5.

CD Tray .............................................................................. 7

2-6.

CD Decoder Board ............................................................. 7

2-7.

Base Unit ............................................................................ 8

2-8.

Cassette Door ..................................................................... 8

............................... 9

................................. 9

5-1.

Circuit Boards Location ................................................... 14

5-2.

Block Diagrams

• Deck Section ................................................................... 15
• CD Section ...................................................................... 17

5-3.

IC Block Diagrams ........................................................... 19

5-4.

Printed Wiring Board —CD Section — ........................... 24

5-5.

Schematic Diagram — CD Section — ............................. 29

5-6.

Schematic Diagram —Panel Section — .......................... 33

5-7.

Printed Wiring Board —Panel Section — ........................ 37

5-8.

Printed Wiring Board — Deck Section — ....................... 42

5-9.

Schematic Diagram —Deck Section — ........................... 47

5-10. Schematic Diagram —Main Section — ........................... 51
5-11. Printed Wiring Board —Main Section — ........................ 55
5-12. Printed Wiring Board — Amp Section — ........................ 60
5-13. IC Pin Function ................................................................ 65

6-1.

Cabinet Section ................................................................. 67

6-2.

Front Panel Section .......................................................... 68

6-3.

Cassette Mechanism Deck Section ................................... 69

6-4.

CD Mechanism Deck Section 1 ....................................... 70

6-5.

CD Mechanism Deck Section 2 ....................................... 71

6-6.

Base Unit Section (KSM-213BCM) ................................. 72

........................................ 73

— 3 —

— 4 —

1

DISC 1 button

2

DISC 2 button

3

DISC 3 button

4

DISC SKIP button

5

§

 OPEN/CLOSE button

6

·

 (TAPE B)

7

·

 

∏

 (CD) button

8

TUNER/BAND button

9

r

 REC button

!º

∏

 PAUSE button

!¡

CD SYNC button

!™

STEREO/MONO button

!£

VOLUME

!¢

REPEAT/MEMORY button

!∞

‚

 + button

!§

DECK B

!¶

JOG DIAL

!•

π

 (STOP) button

!ª

DECK A

@º

º

 – button

@¡

DBFB button

@™

SURROUND button

@£

FILE SELECT button

@¢

DISPLAY/DEMO button

@∞

EDIT/DIRECTION button

@§

PLAY MODE button

@¶

FUNCTION

@•

ª

 (TAPE A) button

@ª

I/

u

 (POWER) button

#º

·

 (TAPE A) button

#¡

ª

 (TAPE B) button

9

8

7

6

0

!¡

!™
!£

!¢

!∞

!§

2

3

4

5

@¶

1

@ª

@•

#º

#¡

@§

@∞
@¢
@£

@™

!ª

@¡

@º

!¶

!•