CDX-GT26 - Sony Car Audio Service Manual (repair manual). Page 16

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CDX-GT26
CDX-GT26
16
16
4-2.  BLOCK  DIAGRAM  – DISPLAY Section –
For Schematic Diagrams:
Note:
•  All capacitors are in 
μF unless otherwise noted.  (p: pF)
  50 WV or less are not indicated except for electrolytics 
and tantalums.
•  All resistors are in 
Ω and 
1
/
4
 W or less unless otherwise 
specifi ed.
•      f  : Internal component.
•  C : Panel designation.
THIS  NOTE  IS  COMMON  FOR  PRINTED  WIRING  
BOARDS  AND  SCHEMATIC  DIAGRAMS.
(In addition to this, the necessary note is printed 
in each block.)
•  A  : B+ Line.
•  Voltages and waveforms are dc with respect to ground 
under no-signal (detuned) conditions.
  no mark : FM
 ( 
MW/LW/SW
  < 
> : 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.
•  Waveforms are taken with a oscilloscope.
  Voltage variations may be noted due to normal production 
tolerances.
•  Circled numbers refer to waveforms.
• Signal path.
  J : 
CD
  F : 
FM
  f : 
MW/LW/SW
  L : 
AUX
• Abbreviation
 AR  : 
Argentina 
model
• Abbreviation
 AR  : 
Argentina 
model
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.)
Caution:
Pattern face side: 
(SIDE B)
Parts face side:
(SIDE A)
Parts on the pattern face side seen 
from   the pattern face are indicated.
Parts on the parts face side seen from   
the parts face are indicated.
• Waveforms
– MAIN Board –
X502
32.768kHz
10
11
94
1
2
100
95
SYSTEM CONTROL
IC401 (2/2)
LCD DRIVE
IC903
KEYIN1
CL
CE
LCD_SO
LCD_CLK
LCD_CE
KEYIN0
92 KEYACK1
82 RE_N0
RE0
RE1
81 RE_IN1
18
97
91
XOUT
XIN
X501
7.92MHz
15
13 OSCOUT
3 NOSE_SW
OSCIN
47
48
46
DIMMER 2
COM1
I
COM4
LCD901
LIQUID
CRYSTAL
DISPLAY
PANEL
3
|
34
‡
39
35
|
38
S1
I
S33
DI
PANEL+B
KEY MATRIX
LSW901–908
S901–908 
(VOLUME)
PUSH SELECT
S905
ROTARY
ENCODER
4 SIRCS
REMOTE
CONTROL
SIGNAL
RECEIVER
 IC902
BACK-LIGHT 1
BACK LIGHT
LED DRIVE
Q932
DIMMER
SWITCH
Q931
LED901,903,905,907,
909,911,913,915,917,
919,921,923,925,927,
LSW901–908
LED931
(LCD BACK LIGHT)
3
OUT
RC_IN1
RC_IN0
KEYACK0
J801
(REMOTE IN)
Note: The components identifi ed by mark 0 or dotted 
line with mark 0 are critical for safety. 
 
Replace only with part number specifi ed.
1.2 Vp-p
32.768 kHz
3.5 Vp-p
7.92 MHz
1 V/DIV, 20 ȝsec/DIV
2 V/DIV, 50 nsec/DIV
1
 IC401 
qa (XOUT)
2
 IC401 
qd (OSCOUT)
0.06 Vp-p
4 MHz
0.05 V/DIV, 50 nsec/DIV
3
 IC001 
qh (XTAL1)
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