Read Sony CDX-GT490U / CDX-GT490US / CDX-GT494U / CDX-GT49UM Service Manual online
CDX-GT49UM/GT490U/GT490US/GT494U
CDX-GT49UM/GT490U/GT490US/GT494U
17
17
For Schematic Diagrams:
Note:
• All capacitors are in
• 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.
• 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.)
(In addition to this, the necessary note is printed in each block.)
• A : B+ Line.
• B : B– Line.
• Voltages and waveforms are dc with respect to ground
• B : B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
(
)
:
AM
<
> : 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
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
J :
J :
CD
F :
FM
f :
AM
L :
AUX
c :
USB
• Abbreviation
AR :
AR :
Argentina
model
EA
: Saudi Arabia model
MX
: Mexican model
For Printed Wiring Boards:
Note:
• X : Parts extracted from the component side.
• Y : parts extracted from the conductor side.
• a
• 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.)
• Waveforms
– MAIN Board –
– MAIN Board –
Caution:
Pattern face side:
(SIDE B)
Parts face side:
(SIDE A)
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.
the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
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.
• Abbreviation
AR :
AR :
Argentina
model
EA
: Saudi Arabia model
MX
: Mexican model
1.8 Vp-p
32.768 kHz
3.2 Vp-p
7.92 MHz
1 V/DIV, 20 ȝsec/DIV
2 V/DIV, 50 nsec/DIV
1
IC401 qd (X_OUT)
2
IC401 os (OSC_OUT)
0.05 Vp-p
4 MHz
0.05 V/DIV, 50 nsec/DIV
3
IC001 qh (XTAL1)
Ver. 1.1
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