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HCD-G2500/XB20/XB22
US Model
HCD-G2500
AEP Model
UK Model
HCD-XB20
E Model
Australian Model
HCD-XB22
SERVICE MANUAL
MINI Hi-Fi COMPONENT SYSTEM
MICROFILM
-- Continued on next page --
SPECIFICATIONS
Model Name Using Similar Mechanism
NEW
CD Mechanism Type
CDM375BD29
Base Unit Type
KSM-213ECM
Optical Pick-up Type
KSS-213B/SN
Model Name Using Similar Mechanism
HCD-GRX2/RX33
DECK-A
TK20FX-SW943-800
DECK-B
TK20FX-SW943-800
CD
SECTION
TAPE
DECK
SECTION
Tape Transpor
Mechanism Type
· This set is the tuner, deck, CD and amplifier
section in LBT-G2500/XB20/XB22.
Photo : HCD-XB20
Peak music power output (Reference)
800 W
Inputs
PHONO IN (phone jacks):
sensitivity 3 mV, impedance 47 kilohms
Outputs
PHONES (stereo phone jack):
accepts headphones of 8
or more
SPEAKER:
accepts impedance of 6 to 16
CD player section
System
Compact disc and degital audio system
Laser
Semiconductor laser (
= 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 ­ 790nm
Tape deck section
Recording system
4-track 2-channel stereo
Frequency response
60 ­ 13,000 Hz (±3 dB),
(DOLBY NR OFF)
using a Sony TYPE I cassette
AUDIO POWER SPECIFICATIONS:
(U.S.A. model only)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
With 6
loads both channels driven, from 70 ­ 20,000 Hz; rated 60 W
per channel minimum RMS power, with no more than 0.9% total
harmonic distortion from 250 mW to rated output.
Amplifier section
North American model
Continuous RMS power output
70 W + 70 W (6
at 1 kHz, 10% THD)
Total harmonic distortion
less than 0.09% (6
at 1kHz, 30 W)
European model
DIN power output (Rated) 60 W + 60 W (6
at 1 kHz, DIN)
Continuous RMS power output (Reference)
70 W + 70 W (6
at 1 kHz, 10% THD)
Music power output (Reference)
120 W + 120 W (6
at 1 kHz, 10%THD)
Other models
The following measured at AC 110,220 V 60 Hz;
DIN power output (Rated) 45 W + 45 W (6
at 1 kHz, DIN)
Continuous RMS power output (Reference)
55 W + 55 W (6
at 1 kHz, 10% THD)
The following measured at AC 120, 240 V 60Hz;
DIN power output (Rated) 50 W + 50 W (6
at 1 kHz, DIN)
Continuous RMS power output (Reference)
60 W + 60 W (6
at 1 kHz, 10% THD)
* Dolby noise reduction manufactured under
license from Dolby Laboratories Licensing
Corporation.
"DOLBY" and the double-D symbol
a are
trademarks of Dolby Laboratories Licensing
Corporation.


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-- 2 --
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
87.5 ­ 108.0 MHz
Antenna
FM lead antenna
Antenna terminals
75
unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
(2 band model)
North American model:
530 ­ 1,710 kHz
(with the tuning interval set at 10 kHz)
Other models:
531 ­ 1,602 kHz
(with the tuning interval set at 9 kHz)
530 ­ 1,710 kHz
(with the tuning interval set at 10 kHz)
(3 band model)
MW:
531 ­ 1,602 kHz
(with the tuning interval set at 9 kHz)
LW:
153 ­ 279 kHz
(with the tuning interval set at 3 kHz)
Antenna
AM loop antenna
Antenna terminals
External antenna terminal
Intermediate frequency
450 kHz
General
Power requirements
North American model:
120 V AC, 60 Hz
Mexican model:
120 V AC, 50/60 Hz
European model:
230 V AC, 50/60 Hz
Australian, South African and Thailand models:
220 ­ 240 V AC, 50/60 Hz
Other models:
110 ­ 120 V AC or 220 ­ 240 V AC,
50/60 Hz (adjustable with voltage selector)
Power consumption
130 W
Dimensions (w/h/d) incl. projecting parts and controls
Approx.355
× 423 × 440 mm
(14
× 16 3/4 × 17 3/8 in)
Mass
Approx. 14.0 kg (30 lb 14 oz.)
Supplied accessories
AM loop antenna (1)
Remote RM-SG5 (1)
FM lead antenna (1)
Design and specifications are subject to change without notice.
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.
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.
SERVICING NOTE
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.
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.


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-- 3 --
SAFETY CHECK-OUT
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 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
µF
1.5 k
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
TABLE OF CONTENTS
1. GENERAL ········································································· 4
--FRONT PANEL-- ························································· 4
--BACK PANEL-- ···························································· 5
2. DISASSEMBLY
2-1.
Top Cover ··········································································· 6
2-2.
Front Panel Assy ································································· 6
2-3.
Main Board ········································································· 7
2-4.
Main Section ······································································· 7
2-5.
CD Mechanism Deck Section ············································ 8
2-6.
Tape Mechanism Deck ······················································· 8
2-7.
Cassette Door ····································································· 9
2-8.
CD Door Assy ···································································· 9
2-9.
Base Unit ·········································································· 10
2-10. Disc Table ········································································· 10
3. MECHANICAL ADJUSTMENTS ····························· 11
4. ELECTRICAL ADJUSTMENTS ······························· 11
5. DIAGRAMS
5-1.
Circuit Boards Location ··················································· 16
5-2.
Block Diagram --Deck Section-- ··································· 17
5-3.
Block Diagram --Tuner/CD Section-- ··························· 19
5-4.
Schematic Diagram --Main Section (1/2)-- ··················· 21
5-5.
Schematic Diagram --Main Section (2/2)--
(US, AUS, MX model) ····················································· 25
5-6.
Printed Wiring Board --Main Section--
(US, AUS, MX model) ····················································· 29
5-7.
Printed Wiring Board --Main Section--
(AEP, UK, E, SP, MY, AR model) ···································· 34
5-8.
Schematic Diagram --Main Section (2/2)--
(AEP, UK, E, SP, MY, AR model) ···································· 39
5-9.
Schematic Diagram --Display Section-- ························ 43
5-10. Printed Wiring Board --Display Section-- ····················· 47
5-11. Printed Wiring Board --CD Section-- ···························· 52
5-12. Schematic Diagram --CD Section-- ······························· 57
5-13. Schematic Diagram --Power Section-- ·························· 60
5-14. Printed Wiring Board --Power Section-- ······················· 63
5-15. IC Block Diagrams ··························································· 68
5-16. IC Pin Function Description ············································· 71
6. EXPLODED VIEWS
6-1.
Top Cover Section ···························································· 73
6-2.
CD Door Section ······························································ 74
6-3.
Panel Section ···································································· 75
6-4.
Main Section ····································································· 76
6-5.
Cassette Button Section ···················································· 77
6-6.
Cassette Mechanism Deck Section ··································· 78
6-7.
CD Mechanism Deck Section ·········································· 79
6-8.
Base Unit Section ····························································· 80
7. ELECTRICAL PARTS LIST ······································ 81


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-- 4 --
SECTION 1
GENERAL
1
I/
u (POWER) button
2
DISPLAY/DEMO button
3
SPECTRUM ANALYZER button
4
ENTER/NEXT button
5
TUNER MEMORY button
6
TUNING MODE button
7
TUNER/BAND button
8
TUNING ­ button
9
TUNING + button
0
STEREO/MONO button
TAPE button
!TM
CD button
PHONO button
DBFB button
!
VOLUME knob
DOLBY NR button
SURROUND button
· button
0 button
) button
6p button
@TM
P button
6 button
· button
@
DISC SKIP button
P button
p button
) button
AMS ± button
0 button
DISC1 button
#TM
DISC2 button
DISC3 button
DISC4 button
#
DISC5 button
r button
· button
0 button
) button
6p button
P button
$TM
PHONES jack
ROCK button
POP button
$
JAZZ button
SALSA button
FLAT button
SLEEP button
t/CLOCK SET button
DAILY1 button
PLAY MODE button
%TM
REPEAT button
EDIT button
1/ALL DISC button
1
2
34
6
7
89
5
!TM
!
@¡ @TM
#¡ #TM #£ #¢
%TM
#
A
A
!ª @º
@
$TM
@§ @¶
see
$£ $¢
$
­ FRONT PANEL ­


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-- 5 --
1
ANTENNA terminal
2
PHONO jack
3
SPEAKER terminal
3
2
1
­ BACK PANEL ­