Sony HCD-GX25 User Manual

1
Ver 1.0 2003. 08
Model Name Using Similar Mechanism HCD-GX45/RG440
CD Mechanism Type
CDM74F-K6BD71A
CD CDM74F-K6BD72
Section
Base Unit Name
BU-K6BD71A
BU-K6BD72
Optical Pick-up Block KSM-213DCP
Tape Deck Model Name Using Similar Machanism HCD-GX45/RG440
Section Tape Transport Mechanism Type CWM43FF-13
SERVICE MANUAL
US Model
Canadian Model
HCD-GX25
AEP Model
UK Model
E Model
Australian Model
HCD-RG220
HCD-GX25/RG220
AUDIO POWER SPECIFICATIONS
(HCD-GX25 USA model only)
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
With 6 ohm loads, both channels driven, from
120 – 10,000 Hz; rated 120 watts per channel
minimum RMS power, with no more than 10 %
total harmonic distortion from 250 milliwatts to
rated output.
Amplifier section
North American models:
HCD-GX25:
Continuous RMS power output (reference):
120 + 120 watts (6 ohms at
1 kHz, 10% THD)
Total harmonic distortion less than 0.07% (6 ohms at
1 kHz, 60 W)
European and Russian models:
HCD-RG220:
DIN power output (rated): 50 + 50 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
60 + 60 watts (6 ohms at
1 kHz, 10% THD)
Music power output (reference):
120 + 120 watts (6 ohms at
1 kHz, 10% THD)
SPECIFICATIONS
Other models:
HCD-RG220:
The following measured at AC 120, 127, 220, 240 V,
50/60 Hz
DIN power output (rated): 80 + 80 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
100 + 100 watts (6 ohms at
1 kHz, 10% THD)
Inputs
GAME INPUT AUDIO L/R (phono jacks):
voltage 250 mV,
impedance 47 kilohms
GAME INPUT VIDEO (phono jack):
1 Vp-p, 75 ohms
Outputs
PHONES (stereo mini jack):
accepts headphones of
8 ohms or more
VIDEO OUT (phono jack):max. output level
1 Vp-p, unbalanced, Sync
negative, load impedance
75 ohms
SPEAKER: accepts impedance of 6 to
16 ohms
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-961-149-01
2003H04-1
© 2003. 08
– Continued on next page –
COMPACT DISC DECK RECEIVER
• HCD-GX25/RG220 is the
tuner, deck, CD and amplifier
section in MHC-GX25/RG220.
(Photo: HCD-GX25)

Sony HCD-GX25 Specifications

General

Type	Mini Hi-Fi System
CD Player	Yes
CD Player Type	Single Disc
Radio Tuner	Yes
Tuner Bands	FM/AM
Cassette Deck	Yes
Bluetooth	No
USB Playback	No
Speakers	2
Remote Control	Yes
Speaker Configuration	2.0 Channel

Summary

Service Manual Overview

Specifications

Details electrical and functional characteristics of the HCD-GX25/RG220.

Safety Precautions

AC Leakage Test

Procedure to check for AC leakage current from exposed metal parts to earth ground.

Handling Optical Pick-up Block

Precautions for handling the optical pick-up block to prevent damage.

Laser Diode Emission Check

Guidelines for checking laser diode emission safely and correctly.

Disassembly Procedures

Case and Front Panel Components

Removing top case, CD door, and front panel sections.

CD Mechanism and Tape Deck Removal

Steps for disassembling the CD and tape deck mechanisms.

Main Internal Boards

Special Test Modes

System Initialization and Tuning

Cold Reset and Tuner Step Change-Over procedures.

CD Specific Modes

Amplifier and General Test Modes

Amplifier Adjustments and Repeat Limit

Electrical Adjustments

CD Section Adjustments

S-Curve Check and RF Level Check procedures for the CD block.

Circuit Diagrams and Layouts

IC Pin Descriptions and Block Diagrams

Printed Wiring Board Layouts

Circuit Schematics

Electrical Parts List

BD Board Components

Panel and Power Amp Components