DOWNLOAD Sony CHC-TB10 / CHC-TB20 / HCD-TB20 Service Manual ↓ Size: 12.26 MB | Pages: 70 in PDF or view online for FREE

Model
CHC-TB10 CHC-TB20 HCD-TB20
Pages
70
Size
12.26 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
chc-tb10-chc-tb20-hcd-tb20.pdf
Date

Sony CHC-TB10 / CHC-TB20 / HCD-TB20 Service Manual ▷ View online

26
HCD-TB20
Note: Clear RF signal waveform means that the shape “ ‡ ” can be
clearly distinguished at the center of the waveform.
E-F Balance (1 Track jump) Check
Procedure :
1. Connect an oscilloscope to TP (TE1) and TP (DVC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback the number nine track.
4. Press the  BX  button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
6. Adjust RV101 on the BD board so that the center of waveform
becomes the same voltage of DVC. (i.e.  A=0V)
Adjustment Location:
[BD BOARD] (Conductor Side)
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.65 
±
0.15Vp-p (RFDC)
1.1 
±
0.4Vp-p (RFAC)
TP(TE1)
TP(DVC)
BD board
oscilloscope
level=1.0 
±
0.5Vp-p
symmetry
A (DC voltage)
center of
waveform
B
DVC
1 track jump waveform
TP (TE1)
TP
(RFAC)
TP
(RFDC)
TP (FE1)
IC101
IC103
RV101
TP (DVC)
1
15
30
1
20
21
40
60
80
41
61
16
TP
(FEI)
27
HCD-TB20
SECTION 7
DIAGRAMS
7-1. Circuit Boards Location
AMP board
MAIN board 
TRANS board
TC board
PANEL board
DISPLAY board
FRONT INPUT board
VOL board
VOL SEL board
SUB POWER board 
MOTOR board
DRIVER board
TRAY SENSOR board
DISK SENSOR board
BD board
IN OUT SW board
28
HCD-TB20
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
f
: internal component.
2
: nonflammable resistor.
1
: fusible resistor.
C
: panel designation.
For printed wiring boards.
Note:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
a
: Through hole.
: Pattern from the side which enables seeing.
A
: B+ Line.
B
: B– Line.
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
: Impossible to measure
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
E
: PB
a
: REC
J
: CD (Analog)
c
: CD (Digital)
• Abbreviation
MX
: Mexican model
KR
: Korea model
Note: The components identified by mark 
0
 or dotted line
with mark 
0
 are critical for safety.
Replace only with part number specified.
• Indication of transistor
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
B
These are omitted.
C
E
29
29
7-2. Block Diagrams
CD Section
• Signal Path
: CD
:DIGITAL OUT
OPTICAL PICK-UP
BLOCK
(A-MAX.3)
PD1
PD2
I5-10
I1-6
LD
VC
SW
VCC
+5V
GND
PD
VR
LD
DRIVE
Q101
RF AMP
DIGITAL
OUT
(OPTICAL)
IC103
VC
27
VFC
25
A
6
B
7
C
8
D
9
E
10
F
11
LD
1
PD
2
IC102
MOTOR/COIL DRIVE
CH1FO
14
CH1RO
13
12
11
17
18
M
SLED
MOTOR
15
16
M
SPINDLE
MOTOR
F+
F-
T+
T-
2
CH1FI
3
CH1RI
5
6
24
23
25
MDP
26
SRDR
29
SFDR
28
TRDR
31
TFDR
30
FRDR
33
FFDR
32
DIGITAL SIGNAL PROCESSOR
D/A CONVERTER
IC101
DIGITAL SERVO
60
D OUT
72
L OUT
75
R OUT
R-CH
R-CH
RFAC
51
28
RFDCO
15
RFAC
16
FE
18
TE
12
SW
17
FEI
29
RFDCI
RFDC
43
FE
39
TE
41
SE
40
5
DATA
DATA
7
CLOK
CLK
6
XLAT
XLT
1
SQSO
8
SENS
27 SSTP
3
XRST
20
MUTING
MASTER CONTROL
IC401(1/3)
CD DATA
35
CD MUTE
66
9
SCLK
2
SQCK
20
SCOR
66
XTAI
67
XTAO
CD CLK
37
XLT
36
SQ DATA IN
32
SENS
56
SQ CLK
33
SCOR
19
LDON
LDON
Q301-304
54
60
28
26
24
XRST
XRST
BU PWM 1
PWM1
BU PWM 2
PWM2
BU PWM 3
PWM3
CH2FO
CH2RO
CH3FO
CH3RO
CH4FO
CH4RO
CH2FI
CH2RI
CH3FI
CH3RI
CH4SI
A
MAIN
SECTION
IC351
+3.3V
REG.
Q102,D101
X101
16.9344MHz
CD D+5V
+3.3V
CD-L
Q305
Q281,283
MUTE
SWITCH
• R-ch is omitted due to same as L-ch.
(Page 30)
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