Read Sony CDX-GT121 / CDX-GT220 / CDX-GT222 Service Manual online
18
18
CDX-GT121/GT220/GT222
CDX-GT121/GT220/GT222
• Waveforms
— MAIN Board —
5-2. BLOCK DIAGRAM — DISPLAY SECTION —
• NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
For schematic diagrams.
Note:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. (p: pF)
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.
•
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.
(The other layers' patterns are not indicated.)
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
) : MW/LW
<
> : CD PLAY
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
J
: CD PLAY
F
: FM
f
: MW/LW
L
: AUX
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)
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.
Q
C
These are omitted
E
B
E
These are omitted
C
B
C
These are omitted
B
E
KEY ACKNOWLEDGE
SWITCH
Q664
X502
32.768kHz
79
80
40
28
29
27
41
52
76
SYSTEM CONTROL
IC501 (2/2)
DISPLAY CONTROL
IC901
KEYIN1
CL
CE
LCD_SO
LCD_CKO
LCD_CE
64
3
SIRCS
OUT
DIMMER
KEYIN0
31 RE-IN0
RE-0
RE-1
32 RE-IN1
KEY ACK
AD_ON
XIN
XOUT
X501
18.432MHz
82
83 OSCOUT
7 NOSE_SW
OSCIN
47
48
46
2
COM1
COM4
LCD901
LIQUID
CRYSTAL
DISPLAY
PANEL
D503
3
|
34
•
39
35
|
38
|
S1
S33
|
DI
LCD
BACK LIGHT
SWITCH
Q932
DIMMER
SWITCH
Q931
LED931
PANEL+B
(
)
KEY MATRIX
LSW901–911,
S901–904
(VOLUME)
PUSH SELECT
RE901
ROTARY
ENCODER
BACK LIGHT
1
LCD BACK
LIGHT
(
)
LSW901–911,
LED941,942,
944,945,951–953
KEY
ILLUMINATE
GT220/GT222
IR
REMOTE CONTROL
SIGNAL RECEIVER
IC971
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
0.7Vp-p
32.768kHz
1
IC501
ul
(XOUT)
1.8Vp-p
18.432MHz
2
IC501
id
(OSCOUT)
0.5 V/DIV, 20
µ
sec/DIV
0.5 V/DIV, 20 nsec/DIV
1Vp-p
8.664MHz
3
IC51
9
(XTI)
0.5 V/DIV, 0.1
µ
sec/DIV
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