Sony CMT-GP7 / HCD-GP7 Service Manual ▷ View online
21
HCD-GP7
E-F Balance Check
Connection:
Procedure:
1.
1.
Connect an oscilloscpe to test point TP2 (TE) and TP7 (DVC)
on the CD board.
on the CD board.
2.
Turn the power on.
3.
Select the function “CD”.
4.
Press three buttons of
x
,
[REPEAT]
and CD
u
simultaneously to set the CD service mode.
5.
Put the disc (YEDS-18) in to playback the number five track.
6.
Press the
[REPEAT]
button. The message “TRAVERSE” is
displayed. (The tracking servo and the sledding servo are turned
OFF)
OFF)
7.
Check the level B of the oscilliscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Traverse Waveform
8.
Press the
[REPEAT]
button. The message “TRAVERSE” is
displayed. (The tracking servo and sledding servo are turned
ON)
Confirm the C (DC voltage) is almost equal to the A (DC
voltage) is step 5.
ON)
Confirm the C (DC voltage) is almost equal to the A (DC
voltage) is step 5.
9.
To exit from this mode, disconnect the power cord.
Traverse Waveform
Checking Location: CD board (SIDE B) (See page 24.)
+
–
–
CD board
TP2 (TE)
TP7 (DVC)
oscilloscope
0V
B
level: 1.0
±
0.5 Vp-p
Center of
the waveform
the waveform
A (DC
voltage)
0V
Tracking servo
Sled servo
ON
C (DC
voltage)
voltage)
Tracking servo
Sled servo
OFF
Checking Location:
– CD BOARD (SIDE B) –
TP4 (FE)
TP2 (TE)
TP5 (RFAC)
TP7 (DVC)
IC104
IC101
IC103
22
HCD-GP7
SECTION 7
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
2
: nonflammable resistor.
•
5
: fusible resistor.
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
•
: Pattern from the side which enables seeing.
(The other layers´ Patterns are not indicated.)
Caution:
Pattern face side:
Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side:
Parts on the parts face side seen from the
(Side A)
parts face are indicated.
• Indication of transistor.
•
C
: panel designation.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: TUNER (FM/AM)
J
: CD
d
: PLAYBACK
G
: RECORD
h
: MD
Note:
The components identified by mark
The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
Q
C
B
These are omitted.
E
Q
23
23
HCD-GP7
POWER-AMP board
SUB-POWER board
THR board
SPEAKER board
POWER board
TC board
MAIN board
CD board
LOADING board
PANEL board
HP board
VOL board
CIRCUIT BOARD LOCATION
3.0 Vp-p
30.5 s
2.8 Vp-p
1 V/DIV, 40 ns/DIV
62 ns
1 V/DIV, 10 s/DIV
4
IC401
qa
(XCOUT)
5
IC401
qd
(XOUT)
– MAIN Board –
• Waveforms
– CD Board –
– CD Board –
100 mV/DIV, 20 s/DIV
1
IC101
t;
(RFAC)(CD Play mode)
200 mV/DIV, 400 ns/DIV
860mVp-p
2
IC101
ra
(TE)(CD Play mode)
3
IC101
el
(FE)(CD Play mode)
100 mV/DIV, 20 s/DIV
350mVp-p
250mVp-p
12.6 Vp-p
12.3 s
6
Q642 collector
(TAPE REC mode)
5 V/DIV, 4 s/DIV
– TC Board –
17.5Vp-p
5V/DIV, 4
µ
s/DIV
9.9
µ
s
7
Q801 collector
– PANEL Board –
24
24
HCD-GP7
7-1. Block Diagram — CD Section —
: CD
• Signal Path
• R-CH is omitted due to same as L-CH
OPTICAL PICK-UP
BLOCK
(KSM-213D)
A
B
C
D
E
F
LD
VC
CD A+3.3V
GND
PD
VR
LD
DRIVE
FOCUS
COIL
TRACKING
COIL
Q101
RF AMP
IC103
DVC
14
A
6
B
7
C
8
D
9
E
10
F
11
LD
1
PD
2
IC150
MOTOR/COIL DRIVE
18
17
12
11
M
M101
SLED
SLED
MOTOR
M
M102
SPINDLE
MOTOR
F+
F-
T+
T-
2
20
25
27
MUTE
MDP
25
SRDR
30
SFDR
29
TRDR
32
TFDR
31
FRDR
34
FFDR
33
DIGITAL SIGNAL PROC.
IC101
DIGITAL SERVO
RFAC
50
29
RFDCI
28
RFDCO
16
FE
17
FEI
12
SW
RFDC
43
FE
39
TE
41
SE
40
66
PCMD
26
RO
4
DATA
R-CH
CD L-CH
6
CLOK
5
XLAT
77
SQCK
8
SCLK
15
SCOR
76
SQSO
26
SSTP
2
XRST
S101
LIMIT
IN SW
CD-DATA
35
CD-CLK
37
XLAT
36
SQ-CLK
33
C-SCOR
19
SQ-DATA-IN
32
7
SENS
SENS
56
IC401 (1/4)
SYSTEM CONTROLLER
15
RF AC
18
TE
CD +3.3V
IC104
D/A CONV,
MP3 DECODER
SDIO
12
23
LO
67
BCLK
BCKIA
13
65
LRCK
LRCKIA
14
71
XTAI
CKI/CKO
60
72
XTAO
XI
62
XO
63
X201
16.9MHz
5
MIDIO
6
MICK
7
MIACK/AD2
39
PO7
1
RESET
MP3 DATA IN
6
MP3 DATA OUT
5
MP3 CLK
7
78
3
MICS/AD0
MP3 CS
47
4
MILP/AD1
MP3 LP
48
MP3 ACK
49
MP3 RESET
46
MP3 REQ
45
XRST
60
BU PWM3
24
BU PWM2
26
BU PWM1
28
LDON
54
+2.5V
REG
1
IC121
3
+2.5V
CD A+3.3V
A(CD)-MUTE
Q101
MUTING
Q303, 304
MUTING
CONTROL
LOAD-IN 68
67
LOAD-OUT
OPEN 69
70
CLOSE
9
7
RIN
FIN
MOTOR
DRIVE
2
4
OUT2
OUT1
IC311
MOTOR DRIVER
M901
(LOADING)
M
A
AMP
SECTION
APC
DRV
22
23
+
–
DRV
+
–
DRV
DRV
15
16
4
14
13
6
7
+
–
5
S1
(LEAF)
Ver 1.1 2003.11
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