Sony HCD-G2500 User manual





 



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 
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













  






 

 
 
 
 


 

  
 
 

 

 
  
 

 

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

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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 Ωor more
SPEAKER: accepts impedance of 6 to 16 Ω
CD player section
System Compact disc and degital 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 – 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 Ωloads 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 Ωat 1 kHz, 10% THD)
Total harmonic distortion less than 0.09% (6 Ωat 1kHz, 30 W)
European model
DIN power output (Rated) 60 W + 60 W (6 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
70 W + 70 W (6 Ωat 1 kHz, 10% THD)
Music power output (Reference)
120 W + 120 W (6 Ωat 1 kHz, 10%THD)
Other models
The following measured atAC 110,220 V 60 Hz;
DIN power output (Rated) 45 W + 45 W (6 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
55 W + 55 W (6 Ωat 1 kHz, 10% THD)
The following measured at AC 120, 240 V 60Hz;
DIN power output (Rated) 50 W + 50 W (6 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
60 W + 60 W (6 Ωat 1 kHz, 10% THD)
*Dolby noise reduction manufactured under
license from Dolby Laboratories Licensing
Corporation.
“DOLBY” and the double-D symbol aare
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 Ωunbalanced
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 VAC or 220 – 240V 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 3/8in)
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:
Checkthe antenna terminals,metaltrim, “metallized” knobs,screws,
and all other exposed metal parts forAC 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-operatedAC voltmeter.The “limit” indication
is 0.75V, 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 2VAC range are suitable. (See
Fig. A)
To Exposed Metal
Parts on Set
0.15
µ F1.5 k
Ω
AC
Voltmeter
(0.75V)
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
1I/u(POWER) button
2DISPLAY/DEMO button
3SPECTRUM ANALYZER button
4ENTER/NEXT button
5TUNER MEMORY button
6TUNING MODE button
7TUNER/BAND button
8TUNING – button
9TUNING + button
0STEREO/MONO button
!¡ TAPE button
!™ CD button
!£ PHONO button
!¢ DBFB button
!∞ VOLUME knob
!§ DOLBY NR button
!¶ SURROUND button
!• ·button
!ª 0button
@º )button
@¡ 6p button
@™ Pbutton
@£ 6button
@¢ ·button
@∞ DISC SKIP button
@§ Pbutton
@¶ pbutton
@• )button
@ª ≠AMS ±button
#º 0button
#¡ DISC1 button
#™ DISC2 button
#£ DISC3 button
#¢ DISC4 button
#∞ DISC5 button
#§ rbutton
#¶ ·button
#• 0button
#ª )button
$º 6p button
$¡ Pbutton
$™ PHONES jack
$£ ROCK button
$¢ POP button
$∞ JAZZ button
$§ SALSA button
$¶ FLAT button
$• SLEEP button
$ª t/CLOCK SET button
%º DAILY1 button
%¡ PLAY MODE button
%™ REPEAT button
%£ EDIT button
%¢ 1/ALL DISC button
123467
89
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– FRONT PANEL –
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— 5 —
1ANTENNA terminal
2PHONO jack
3SPEAKER terminal
3
2
1
– BACK PANEL –
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— 6 —
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. TOP COVER
2-2. FRONT PANEL ASSY
2 Seven screws
1 Three screws
1 Three screws
3 Top cover
3 Front panel assy
2 Four screws
1 Screw
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— 7 —
2-3. MAIN BOARD
2-4. MAIN SECTION
1 Two screws
2 Three screws
2 Three screws
2 Two screws
1 Three screws
3 Rear panel
7 MAIN board
6 Two screws
5 Two flat wires
4 Connector
1 Two screws
1 Two screws
2 Main section
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— 8 —
2-5. CD MECHANISM DECK SECTION
2-6. TAPE MECHANISM DECK
3 Five screws
(BVTP 3
× 8)
4 CD mechanism
deck section
2 Flat wire and
lead wire
1 Open the clamp.
1 Six screws
2 Tape mechanism deck
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— 9 —
2-7. CASSETTE DOOR
2-8. CD DOOR ASSY
3 Door spring
1 Cassette door (R)
3 Door spring
2 Cassette door (L)
8 CD door assy
1 Three screws
6 Four screws
7 Connector
4 Screw
2 PLAY SW board
3 Three flat wires
5 DOOR SW board
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— 10 —
2-9. BASE UNIT
2-10. DISC TABLE
Note:
When the disc table is installed, adjust the positions
of roller cam and mark zas shown in the figure,
then set to the groove of disc table.
1 Screw
(BVTP 3
× 8)
1 Screw
(BVTP 3
× 8)
4 Disc table
3 Step screw
2 Bracket (BU)
A
A
3 Base unit
1 Yoke bracke
t
2 Boss
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— 11 —
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback head pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
SECTION 3
MECHANICAL ADJUSTMENTS
Meter reading
40 to 70 g • cm
(0.56 - 0.97 oz • inch)
1 to 5 g • cm
(0.01 - 0.07 oz • inch)
55 to 140 g • cm
(0.76 - 1.94 oz • inch)
Torque
FWD
FWD
back tension
FF/REW
Torque meter
CQ-102C
CQ-102C
CQ-201B
SECTION 4
ELECTRICAL ADJUSTMENTS
1. Demagnetize the record/playback head with a head
damagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
Procedure:
1. Mode : Playback
DECK SECTION 0 dB=0.775V
Tape
P-4-A100
WS-48B
Signal
10 kHz, –10 dB
3 kHz, 0 dB
Used for
Azimuth Adjustment
Tape Speed Adjustment
test tape
P-4-A100
(10kHz, –10dB) SPEAKER
terminal (JK703)
level meter
+
–
set
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— 12 —
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 2 dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location:
Remove the cassette lid before adjustment (See page 9)
test tape
WS-48B
(3kHz, 0dB)
Tape Speed Adjustment (Deck A)
Procedure:
1. Mode: Playback
2. Adjust the SFR809 so that the frequency counter reads 3,000
Hz ± 90Hz.
Adjustment Location: MAIN board (See page 14)
Sample Value of Wow and flutter
W. RMS (JIS) within 0.3%
(test tape: WS-48B)
L-CH
peak
R-CH
peak
screw
position
output
level within
2dB within 2dB
L-CH
peak
screw
position
R-CH
peak
test tape
P-4-A100
(10kHz, –10dB) SPEAKER
terminal (JK703)
(L-CH)
set
L
R
SPEAKER
terminal (JK703)
(R-CH)
Waveform of oscilloscope
in phase 45˚ 90˚ 135˚ 180˚
good wrong
SPEAKER
terminal (JK703)
set
frequency counter
+
–
Adjustment screws
REC/PB head (deck A)
or PB head (deck B)
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— 13 —
TUNER SECTION 0 dB=1µV
AM Tuning Voltage Adjustment
Procedure:
1. Set the reception frequency of the unit to 530 kHz.
2. Adjust L105 for 1.2 ± 0.05 V reading on the DC voltmeter.
3. Set the reception frequency of the unit to 1,710 kHz.
4. Confirm that the voltage reading on the DC voltmeter is within
8.0 ± 0.5 V.
Adjustment Location: MAIN board (See page 14)
AM Tracking Adjustment
Procedure:
1. Tune the set to 600 kHz.
2. Set the output ofAM RF SSG so that the input level of the set
will become 60 dB (µV/m).
3. Adjust L104 so that when the waveform on the oscilloscope is
maximum, no noise appears.
4. Tune the set to 1,400 kHz.
5. Adjust TC102 so that when the waveform on the oscilloscope
is maximum, no noise appears.
• Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer
capacitors.
Adjustment Location: MAIN board (See page 14)
FM Tuning Voltage Adjustment (US, Australian, Mexican model)
DC voltmeter
Procedure :
1. Set the reception frequency of the unit to 87.5 MHz.
2. Adjust L103 for 1.2 ± 0.05V reading on the DC voltmeter.
3. Set the reception frequency of the unit to 108 MHz.
4. Confirm that the voltage reading on the DC voltmeter is within
7.8 ± 0.5V.
Adjustment Location: MAIN board (See page 14)
TP1
+
IF
G
VT
Main board
DC voltmeter
Main board
–
F
G
VT
TP1
+
–
AM RF SSG
loop antenna
set
loop antenna
(Supplied accessories)
60 cm AM ANTENNA
terminal (TM1)
30% amplitude
modulation by
400 Hz signal Field strength dB (
µ V/m) =SSG output level dB ( µ V/m) –26 dB.
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— 14 —
FM Tuned Level Adjustment
set
Procedure:
1. Supply a 28 dB 98 MHz signal from theANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust SFR101 to the point (moment) when the TUNED
indicator will change from going off to going on.
Adjustment Location: MAIN board
FM Tracking Adjustment
(US, Australian, Mexican model)
Procedure:
1. Tune the set to 90 MHz.
2. Adjust L102 so that when the waveform on the oscilloscope is
maximum, no noise appears.
3. Tune the set to 106 MHz.
4. Adjust TC101 so that when the waveform on the oscilloscope
is maximum, no noise appears.
• Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer
capacitors.
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD] — Component side —
Carrier frequency : 90 MHz, 106 MHz
Modulation : AUDIO 1kHz, 75kHz deviation (100%)
Output level : 20 dB (at 75 Ω open)
FM RF SSG
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 28 dB (at 75
Ω open)
FM ANTENNA terminal
(JK101)
75
Ω coaxial
FM ANTENNA terminal (JK101)
SPEAKER terminal (JK703)
FM RF SSG
set
oscilloscope
JK101
L105
TC102
L104
IC301
L102
L103
TC101
SFR101
IC103
(AM
Tracking)
(AM Tuning
Voltage)
(FM Tuning
Voltage)
(FM
Tracking
)
(FM Tuned Level)
SFR809
(Tape speed)
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— 15 —
CD SECTION
Note:
1. CD Block is basically constructed to operate without
adjustment. Therefore, check each item in order given.
2. UseYEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩimpedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
5. Adjust thefocus bias adjustmentwhenoptical blockisreplaced.
Focus Bias Adjustment
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP01 on CD DECODER
board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
Note: Clear RF signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
oscilloscope
level: 1.0 Vp-p
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
+0.3
–0.2
Adjustment Location: CD DECODER board
Procedure:
1. Connect DC voltmeter to test point TP02 on CD DECODER
board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and stop.
4. Adjust VR01 so that the DC voltmeter reading is 0 ± 20 mV.
Adjustment Location: CD DECODER board
Focus Gain Adjustment (VR02)
This gain has a margin, so even if it is slightly off.
There is no problem.
Therefore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
Adjustment Location
[CD DECODER BOARD] — Component side —
CD DECODER
boardTP02
FEO
VC
DC voltmeter
+
–
CD DECODER
board
RF
VC
TP01
VR01
(Focus Bias)
VR02
(Focus Gain
)
IC01
TP01
TP02
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
 


 

 

 
 



 
 


 






 



 
 

 
 
 

 
   
  
 


 
 



    
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










 


 















 





 








 

 













 

























 
 




 










































 


     



 












 







 

 
 


 









 








   




















































  








 

 

 
















 





















 





 











 



  










 













 


 

 
 


 



 





 

 













 




 



 


 

 


  


 
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