Sony CDX-GT490U / CDX-GT490US / CDX-GT494U / CDX-GT49UM Service Manual ▷ View online
CDX-GT49UM/GT490U/GT490US/GT494U
7
• Saudi Arabia model
Connection diagram
1 To a metal surface of the car
First connect the black ground (earth) lead, then
connect the yellow, and red power supply leads.
connect the yellow, and red power supply leads.
2 To the power antenna (aerial) control lead
or power supply lead of antenna (aerial)
booster
booster
Notes
t It is not necessary to connect this lead if there
t It is not necessary to connect this lead if there
is no power antenna (aerial) or antenna (aerial)
booster, or with a manually-operated telescopic
antenna (aerial).
booster, or with a manually-operated telescopic
antenna (aerial).
t When your car has a built-in FM/AM antenna (aerial)
in the rear/side glass, see “Notes on the control
and power supply leads.”
and power supply leads.”
3 To AMP REMOTE IN of an optional power
other system may damage the unit.
4 To the +12 V power terminal which is
energized in the accessory position of the
ignition key switch
ignition key switch
Notes
t If there is no accessory position, connect to the
t If there is no accessory position, connect to the
+12 V power (battery) terminal which is energized
at all times.
at all times.
Be sure to connect the black ground (earth) lead to
t When your car has a built-in FM/AM antenna (aerial)
in the rear/side glass, see “Notes on the control
and power supply leads.”
and power supply leads.”
5 To the +12 V power terminal which is
energized at all times
Be sure to connect the black ground (earth) lead to a
Notes on the control and power supply leads
t The power antenna (aerial) control lead (blue) supplies
t The power antenna (aerial) control lead (blue) supplies
+12 V DC when you turn on the tuner.
t When your car has built-in FM/AM antenna (aerial) in
the rear/side glass, connect the power antenna (aerial)
control lead (blue) or the accessory power supply lead
(red) to the power terminal of the existing antenna
(aerial) booster. For details, consult your dealer.
control lead (blue) or the accessory power supply lead
(red) to the power terminal of the existing antenna
(aerial) booster. For details, consult your dealer.
t A power antenna (aerial) without a relay box cannot be
used with this unit.
Memory hold connection
When the yellow power supply lead is connected, power
will always be supplied to the memory circuit even when
the ignition switch is turned off.
When the yellow power supply lead is connected, power
will always be supplied to the memory circuit even when
the ignition switch is turned off.
Notes on speaker connection
t Before connecting the speakers, turn the unit off.
t Use speakers with an impedance of 4 to 8 ohms, and with
t Before connecting the speakers, turn the unit off.
t Use speakers with an impedance of 4 to 8 ohms, and with
adequate power handling capacities to avoid its damage.
t Do not connect the speaker terminals to the car
chassis, or connect the terminals of the right speakers
with those of the left speaker.
with those of the left speaker.
t Do not connect the ground (earth) lead of this unit to
the negative (–) terminal of the speaker.
t Do not attempt to connect the speakers in parallel.
t Connect only passive speakers. Connecting active
t Connect only passive speakers. Connecting active
terminals may damage the unit.
t To avoid a malfunction, do not use the built-in speaker
leads installed in your car if the unit shares a common
negative (–) lead for the right and left speakers.
negative (–) lead for the right and left speakers.
t Do not connect the unit’s speaker leads to each other.
Note on connection
“FAILURE” appears in the display. In this case, make
CDX-GT49UM/GT490U/GT490US/GT494U
8
SECTION 3
DISASSEMBLY
• This set can be disassembled in the order shown below.
3-1. SUB
PANEL
ASSY
(Page
9)
3-2. CD MECHANISM BLOCK
(Page
(Page
9)
SET
3-3. MAIN
BOARD
(Page
10)
3-5. CHASSIS (T) SUB ASSY
(Page
(Page
11)
3-6. ROLLER ARM ASSY
(Page
(Page
11)
3-7. CHASSIS
(OP)
ASSY
(Page
12)
3-8. CHUCKING ARM SUB ASSY
(Page
(Page
12)
3-9. SLED
MOTOR
ASSY
(Page
13)
3-10. OPTICAL PICK-UP SECTION
(Page
(Page
14)
3-11. OPTICAL PICK-UP
(Page
(Page
14)
3-4. SERVO
BOARD
(Page
10)
CDX-GT49UM/GT490U/GT490US/GT494U
9
Note: Follow the disassembly procedure in the numerical order shown below.
3-1. SUB PANEL ASSY
3-2. CD MECHANISM BLOCK
2
two claws
3 two claws
4 sub panel assy
1 two screws
(+PTT
2.6
u 6)
4 CN701
3
1 screw
(+PTT
2.6
u 6)
2 screw
(+PTT
2.6
u 6)
6 two screws
(+PTT
2.6
u 4)
7 bracket (CD)
8 CD mechanism block
5 CN501 (3P)
CDX-GT49UM/GT490U/GT490US/GT494U
10
3-3. MAIN BOARD
3-4. SERVO BOARD
9 MAIN board
insulating sheet
3
2 two screws
(+PTT
2.6
u 8)
1 three screws
(+BTT
2.6
u 5)
7 screw
(+PTT
2.6
u 10)
8 heat sink
4 two screws
(+P
2.6
u 8)
6 screw
(+P
2.6
u 8)
5 two screws
(+PTT
2.6
u 10)
7
SERVO board
SERVO board
3
toothed lock screw
(M
1.7
u 2.5)
2
toothed lock screw
(M
1.7
u 2.5)
1
Remove the eleven solders.
6
optical pick-up (16 core)
(CN101)
4
claw
5
claw
gray
yellow
blue
orange
red
black
red
white
black
red
white
Click on the first or last page to see other CDX-GT490U / CDX-GT490US / CDX-GT494U / CDX-GT49UM service manuals if exist.